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84186890 B GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Contents Introduction ...... 2 Keys, Doors, and Windows ...... 9 Seats and Restraints ...... 52 Storage ...... 112 Instruments and Controls ...... 117 Lighting ...... 165 Infotainment System ...... 176 Climate Controls ...... 177 Driving and Operating ...... 185 Care ...... 327 Service and Maintenance . . . . . 439 Technical Data ...... 457 Customer Information ...... 462 Reporting Safety Defects ...... 472 OnStar ...... 476 Connected Services ...... 484 Index ...... 487 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

2 Introduction Introduction This manual describes features that Canadian Vehicle Owners may or may not be on the vehicle because of optional equipment that A French language manual can be was not purchased on the vehicle, obtained from your dealer, at model variants, country www.helminc.com, or from: specifications, features/applications Propriétaires Canadiens that may not be available in your region, or changes subsequent to On peut obtenir un exemplaire de the printing of this owner’s manual. ce guide en français auprès du The names, logos, emblems, concessionnaire ou à l'adresse If the vehicle has the Duramax suivante: slogans, vehicle model names, and diesel , see the Duramax vehicle body designs appearing in diesel supplement for additional and Helm, Incorporated this manual including, but not limited specific information on this engine. Attention: Customer Service to, GM, the GM logo, GMC, the 47911 Halyard Drive GMC Truck Emblem, SIERRA, and Refer to the purchase Plymouth, MI 48170 DENALI are trademarks and/or documentation relating to your USA service marks of specific vehicle to confirm the LLC, its subsidiaries, affiliates, features. Using this Manual or licensors. Keep this manual in the vehicle for quick reference. To quickly locate information about For first sold in Canada, the vehicle, use the Index in the substitute the name “General back of the manual. It is an Motors of Canada Company” for alphabetical list of what is in the GMC Division wherever it appears manual and the page number where in this manual. it can be found.

Litho in U.S.A. Part No. 84186890 B Second Printing © 2019 General Motors LLC. All Rights Reserved. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Introduction 3 Danger, Warning, and Vehicle Symbol Chart Caution Here are some additional symbols that may be found on the vehicle Warning messages found on vehicle and what they mean. See the labels and in this manual describe features in this manual for hazards and what to do to avoid or information. reduce them. A circle with a slash through it is a u : Air Conditioning System safety symbol which means “Do { Danger not,”“Do not do this,” or “Do not let G : Air Conditioning Refrigerant Oil this happen.” Danger indicates a hazard with a 9 : Readiness Light high level of risk which will result Symbols ! : Antilock System (ABS) in serious injury or death. $ The vehicle has components and : Brake System Warning Light labels that use symbols instead of 9 : Dispose of Used Components text. Symbols are shown along with Properly { Warning the text describing the operation or P : Do Not Apply High Pressure information relating to a specific Water Warning indicates a hazard that component, control, message, could result in injury or death. gauge, or indicator. B : Engine Coolant Temperature M : Shown when the owner’s _ : Flame/Fire Prohibited manual has additional instructions H : Flammable or information. Caution [ : Forward Collision Alert * : Shown when the service Caution indicates a hazard that manual has additional instructions R : Fuse Block Cover Lock could result in property or vehicle or information. Location damage. 0 : Shown when there is more + : Fuses information on another page — j : ISOFIX/LATCH System Child “see page.” Restraints GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

4 Introduction Q : Keep Fuse Block Covers Properly Installed | : Lane Change Alert @ : Lane Departure Warning A : Lane Keep Assist * : Malfunction Indicator Lamp : : Oil Pressure X : Park Assist ~ : Pedestrian Ahead Indicator O : Power 7 : Rear Cross Traffic Alert I : Registered Technician / : Remote Vehicle Start > : Reminders I : Side Blind Zone Alert h : Stop/Start 7 : Pressure Monitor d : Traction Control/StabiliTrak/ Electronic Stability Control (ESC) a : Under Pressure V : Vehicle Ahead Indicator GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Introduction 5 Instrument Panel Overview GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

6 Introduction 1. Tow/Haul Mode (On Some 9. Climate Control Systems 0 177 A DC/AC Switch. See Power Models). See Driver Mode (If Equipped). Outlets 0 121. 0 Control 238. Dual Automatic Climate Control @ Lane Departure Warning Automatic Transfer Case System 0 179 (If Equipped). Control (If Equipped). See (LDW) (2500/3500 Series) 0 10. Heated and Ventilated Front 0 276 (If Equipped). Four- Drive 227. Seats 0 60 (If Equipped). Driver Mode Control 0 238 (If 5 Hill Descent Control Switch Equipped). 11. A Lane Keep Assist (LKA) (If Equipped). See Hill Descent (1500 Series) 0 278 (If 0 0 Control (HDC) 237. 2. Air Vents 182. Equipped). 0 3. Head-Up Display (HUD) 0 152 j Power Assist Steps 34 (If X Park Assist Switch (If (If Equipped). Equipped). Equipped). See Assistance 4. Turn Signal Lever. See Turn Systems for Parking or Backing L Express Window Down and Lane-Change Signals 0 257. Button (If Equipped). See 0 170. Power Windows 0 47. h Auto Stop Disable Switch Wiper/Washer 0 (If Equipped). See Stop/Start Tow/Haul Mode 227 (On 0 119. System 0 213. Some Models). 5. Instrument Cluster 0 126. 12. Power Outlet (Alternating 5 Power Release Tailgate Current) (If Equipped). See 6. Shift Lever. See Automatic (If Equipped). See Tailgate 0 Power Outlets 0 121. 221. 0 29. 0 Range Selection Mode. See 13. Power Outlets 121. | Hazard Warning Flashers Manual Mode 0 224. 14. USB Port. See the infotainment 0 169. 7. Light Sensor. See Automatic manual. System 0 168. g Traction Control/Electronic 15. Wireless Charging 0 122 (If Stability Control 0 235. 8. Infotainment 0 176. Equipped). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Introduction 7 16. Trailer Brake Control Panel (If 22. 0 243. Equipped). See “Integrated Adaptive Cruise Control (1500 Trailer Brake Control System” Series) 0 245 (If Equipped). under Towing Equipment 0 296. Forward Collision Alert (FCA) System 0 268 (If Equipped). 17. ENGINE START/STOP. See Ignition Positions (Keyless Heated Wheel 0 119 Access) 0 208 or (If Equipped). Ignition Positions (Key Access) 23. Data Link Connector (DLC) 0 210. (Out of View). See Malfunction 18. Controls (If Indicator Lamp (Check Engine Equipped). See the Light) 0 137. infotainment manual. 24. Electric 0 233. Driver Information Center (DIC) 25. Fog Lamps 0 170 (If Controls. See Driver Equipped). Information Center (DIC) (Base Level) 0 147 or Instrument Panel Illumination 0 Driver Information Center (DIC) Control 172. (Midlevel and Uplevel) 0 148. Exterior Cargo Lamps 0 171. 19. Horn 0 119. Exterior Lamp Controls 0 165. 20. Release. See Hood Task Lighting 0 171 (If 0 330. Equipped). 21. Steering Wheel Adjustment 0 118 (Out of View). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

8 Introduction 2 NOTES GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 9 Steering Column Lock ...... 37 Keys and Locks Keys, Doors, and Immobilizer ...... 37 Windows Immobilizer Operation ...... 37 Keys (Key Access) Exterior Mirrors Convex Mirrors ...... 39 { Warning Keys and Locks Manual Mirrors ...... 39 Keys (Key Access) ...... 9 Trailer-Tow Mirrors ...... 40 Leaving children in a vehicle with Keys (Keyless Access) ...... 12 Power Mirrors ...... 41 Remote Keyless Entry (RKE) the ignition key is dangerous and Folding Mirrors ...... 42 children or others could be System ...... 13 Heated Mirrors ...... 43 Remote Keyless Entry (RKE) seriously injured or killed. They Automatic Dimming Mirror . . . . . 43 could operate the power windows System Operation (Key Blind Spot Mirrors ...... 43 or other controls or make the Access) ...... 13 Reverse Tilt Mirrors ...... 44 Remote Keyless Entry (RKE) vehicle move. The windows will System Operation (Keyless Interior Mirrors function with the keys in the Access) ...... 16 Interior Rearview Mirrors ...... 44 ignition, and children or others Remote Vehicle Start ...... 25 Manual Rearview Mirror ...... 44 could be caught in the path of a Door Locks ...... 26 Automatic Dimming Rearview closing window. Do not leave ...... 27 Mirror ...... 44 children in a vehicle with the Delayed Locking ...... 27 Rear Camera Mirror ...... 45 ignition key. Automatic Door Locks ...... 27 Lockout Protection ...... 28 Windows Safety Locks ...... 28 Windows ...... 47 Manual Windows ...... 47 Doors Power Windows ...... 47 Tailgate ...... 29 Rear Windows ...... 49 Power Assist Steps ...... 34 Sun Visors ...... 50 Vehicle Security Roof Vehicle Security ...... 36 ...... 50 Vehicle Alarm System ...... 36 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

10 Keys, Doors, and Windows reduce the risk of unintentionally Warning (Continued) moving the key out of the RUN position. Do not add any additional impacted, and may not items to the ring attached to the deploy. To reduce the risk of ignition key. Attach additional items unintentional rotation of the only to the second ring, and limit ignition key, do not change the added items to a few essential keys way the ignition key and Remote or small, light items no larger than Keyless Entry (RKE) transmitter, an RKE transmitter. if equipped, are connected to the provided key rings.

The ignition key and key rings, and { Warning RKE transmitter, if equipped, are designed to work together as a If the key is unintentionally system to reduce the risk of rotated while the vehicle is unintentionally moving the key out running, the ignition could be of the RUN position. The ignition moved out of the RUN position. key has a small hole to allow This could be caused by heavy attachment of the provided key ring. items hanging from the key ring, It is important that any replacement or by large or long items attached ignition keys have a small hole. See to the key ring that could be your dealer if a replacement key is contacted by the driver or required. steering wheel. If the ignition The combination and size of the moves out of the RUN position, rings that came with your keys were the engine will shut off, braking specifically selected for your and steering power assist may be vehicle. The rings are connected to (Continued) the key like two links of a chain to GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 11 Programming with Two Programming without Recognized Keys Recognized Keys To program a new key: Program a new key to the vehicle 1. Insert the original, already when a recognized key is not programmed key in the ignition available. Canadian regulations and turn the ignition on. require that owners see their dealer. 2. Turn the ignition off, and If two currently recognized keys are remove the key. not available, follow this procedure to program the first key. 3. Quickly, within five seconds, insert the second original This procedure will take already programmed key in the approximately 30 minutes to Interference from radio-frequency ignition and turn the ignition on. complete for the first key. The identification (RFID) tags may vehicle must be off and all of the 4. Turn the ignition off, and prevent the key from starting the keys you wish to program must be remove the key. vehicle. Keep RFID tags away from with you. the key when starting the vehicle. 5. Insert the key to be 1. Insert the new vehicle key into programmed and turn the The key is used for the ignition, all the ignition. ignition on within five seconds. door locks, and the glove box. 2. Turn the ignition on. The 6. After a few seconds, the If equipped with memory seats, security light will come on. security light will turn off once keys 1 and 2 are linked to seating the key has been programmed. 3. Wait 10 minutes until the positions of memory 1 or 2. See security light turns off. Memory Seats 0 58. 7. Repeat Steps 1–5 if additional keys are to be programmed. 4. Turn the ignition off. Programming Keys If a key is lost or damaged, see your 5. Repeat Steps 2–4 two more Follow these procedures to program dealer to have a new key made. times. After the third time, turn up to eight keys to the vehicle. the ignition on; the key is GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

12 Keys, Doors, and Windows learned and all previously With an active OnStar or connected known keys will no longer work service plan, an OnStar Advisor with the vehicle. may remotely unlock the vehicle. 0 6. To learn a second key, turn the See OnStar Overview 476. ignition off, insert the second key to be learned, and turn the Keys (Keyless Access) ignition on. After two keys are learned, the { Warning remaining keys can be learned by Leaving children in a vehicle with following the procedure in an ignition key or Remote “Programming with Two Keyless Entry (RKE) transmitter is Recognized Keys.” dangerous and children or others If the vehicle has the Keyless The key has a bar-coded key tag could be seriously injured or Access system, the transmitter has that the dealer or qualified locksmith killed. They could operate the a button on the side of the can use to make new keys. Store or other controls or transmitter used to remove the key. this information in a safe place, not make the vehicle move. The in the vehicle. This key is used for the driver door windows will function with the key and glove box. See your dealer if a replacement in the ignition or with the RKE key or additional key is needed. transmitter in the vehicle, and If it becomes difficult to turn a key, children or others could be caught inspect the key blade for debris. in the path of a closing window. Periodically clean with a brush Do not leave children in a vehicle or pick. with the ignition key or an RKE transmitter. If locked out of the vehicle, see Roadside Assistance Program 0 466. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 13 If equipped with memory seats, RKE Remote Keyless Entry transmitters 1 and 2 are linked to seating positions of memory 1 or 2. (RKE) System Operation See Memory Seats 0 58. (Key Access) The RKE transmitter functions may Remote Keyless Entry work up to 60 m (197 ft) away from (RKE) System the vehicle. See Radio Frequency Statement Other conditions can affect the 0 472. performance of the transmitter. See Remote Keyless Entry (RKE) If there is a decrease in the Remote System 0 13. Keyless Entry (RKE) operating Press the button to remove the key. range: Never pull the key out without . Check the distance. The pressing the button. transmitter may be too far from See your dealer if a replacement the vehicle. key or additional key is needed. . Check the location. Other If it becomes difficult to turn a key, vehicles or objects may be inspect the key blade for debris. blocking the signal. Periodically clean with a brush . Check the transmitter's battery. or pick. See “Battery Replacement” later With an active OnStar or connected in this section. service plan, an OnStar Advisor . If the transmitter is still not may remotely unlock the vehicle. working correctly, see your 0 See OnStar Overview 476. dealer or a qualified technician / : Press and release Q, then for service. If locked out of the vehicle, see immediately press and hold / until Roadside Assistance Program 0 466. the turn signal lamps flash or for at GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

14 Keys, Doors, and Windows least four seconds. The engine may may come on and stay on for Press and hold 7 for more than be started from outside the vehicle 20 seconds or until the ignition is three seconds to activate the panic using the RKE transmitter. See turned on. alarm. The turn signal lamps flash 0 Remote Vehicle Start 25. If enabled, the turn signal lamps and the horn sounds repeatedly for Q : Press to lock all doors. flash twice to indicate unlocking has 30 seconds. The alarm turns off occurred. If enabled, the exterior 7 If enabled, the turn signal lamps lamps may turn on. See Vehicle when the ignition is turned on or may flash and/or the horn may Personalization 0 156. is pressed again. The ignition must sound on the second press to be off for the panic alarm to work. indicate locking has occurred. Pressing K on the RKE transmitter If enabled, the horn chirps when Q disarms the alarm system. See Programming Transmitters to is pressed again within Vehicle Alarm System 0 36. the Vehicle three seconds. See Vehicle If equipped with remote mirror Only RKE transmitters programmed 0 to this vehicle will work. If a Personalization 156. folding, pressing and holding K for transmitter is lost or stolen, a Pressing Q arms the alarm system. one second will unfold the mirrors, replacement can be purchased and See Vehicle Alarm System 0 36. if enabled. See Vehicle programmed through your dealer. Personalization 0 156. Each vehicle can have up to If equipped with remote mirror eight transmitters programmed to it. folding, pressing and holding Q for Press and hold K to remotely open See your dealer for transmitter one second will fold the mirrors, the windows, if enabled. See programming. if enabled. See Vehicle Vehicle Personalization 0 156. 0 Personalization 156. x : Press twice quickly to release K : Press once to unlock only the the tailgate, if equipped. driver door. If K is pressed again 7 : Press and release to initiate the within three seconds, all remaining vehicle locator. The turn signal lamps flash and the horn sounds doors unlock. The interior lamps three times. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 15 Battery Replacement Replace the battery in the Caution transmitter soon if the REPLACE { Warning BATTERY IN REMOTE KEY When replacing the battery, do displays in the Driver Information not touch any of the circuitry on Never allow children to play with Center (DIC). the transmitter. Static from your the RKE transmitter. The body could damage the To replace the battery: transmitter contains a small transmitter. battery, which can be a choking hazard. If swallowed, internal burns can occur, resulting in severe injury or death. Seek Caution medical attention immediately if a battery is swallowed. Always replace the battery with the correct type. Replacing the battery with an incorrect type could potentially create a risk of { Warning battery explosion. Dispose of used batteries according to To avoid personal injury, do not instructions and local laws. Do touch metal surfaces on the RKE not attempt to burn, crush, or cut transmitter when it has been 1. Separate and remove the back the used battery, and avoid exposed to extreme heat. These cover of the transmitter with a exposing the battery to surfaces can be hot to the touch flat, thin object, such as a coin. environments with extremely low at temperatures above 59 °C air pressures or high (138 °F). temperatures. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

16 Keys, Doors, and Windows Remote Keyless Entry (RKE) System Operation (Keyless Access) The Keyless Access system allows for vehicle entry when the transmitter is within 1 m (3 ft). See “Keyless Access Operation” later in this section. The RKE transmitter functions may work up to 60 m (197 ft) away from the vehicle. 2. Press and slide the battery Remove the key by pressing the down toward the pocket of the Other conditions can affect the button on the side of the RKE transmitter in the direction of performance of the transmitter. See transmitter near the bottom and pull Remote Keyless Entry (RKE) the key ring. Do not use a 0 the key out. Never pull the key out metal object System 13. without pressing the button. 3. Remove the battery. The key that is part of the RKE See your dealer if a new transmitter transmitter can be used for all locks. 4. Insert the new battery, positive is needed. side facing up. Replace with a CR2032 or equivalent battery. 5. Push together the transmitter back cover top side first, and then the bottom toward the key ring. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 17 chirps when Q is pressed again interior lamps may come on and within three seconds. See Vehicle stay on for 20 seconds or until the Personalization 0 156. ignition is turned on. If enabled, the turn signal lamps If the driver door is open when is Q flash twice to indicate unlocking has pressed, all doors will lock and then occurred. If enabled, the exterior the driver door will immediately lamps may turn on. See Vehicle unlock, if enabled. See Vehicle Personalization 0 156. Personalization 0 156. Pressing K on the RKE transmitter If the passenger door is open when disarms the alarm system. See Q is pressed, all doors lock. Vehicle Alarm System 0 36. / : Press and release Q, then Pressing Q arms the alarm system. If equipped with remote mirror immediately press and hold / until See Vehicle Alarm System 0 36. folding, pressing and holding K for the turn signal lamps flash or for at If equipped with remote mirror one second will unfold the mirrors, if enabled. See Vehicle least four seconds. The engine may folding, pressing and holding Q for Personalization 0 156. be started from outside the vehicle one second will fold the mirrors, using the RKE transmitter. See if enabled. See Vehicle Press and hold K until the windows 0 Remote Vehicle Start 25. Personalization 0 156. fully open, if remote window Q : Press to lock all doors and the K : Press once to unlock only the operation is enabled. See Vehicle tailgate, if equipped. driver door. If K is pressed again Personalization 0 156. If enabled, the turn signal lamps within three seconds, all remaining x : Press twice quickly to release flash and/or the horn may sound on the tailgate, if equipped. the second press to indicate locking doors and the tailgate unlock. The has occurred. If enabled, the horn GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

18 Keys, Doors, and Windows 7 : Press and release to initiate Keyless Access can be vehicle locator. The turn signal programmed to unlock all doors on lamps flash and the horn sounds the first lock/unlock press from the three times. driver door. Keyless Unlocking can also be turned off. See Vehicle Press and hold 7 for more than Personalization 0 156. three seconds to activate the panic If equipped with memory seats, RKE alarm. The turn signal lamps flash transmitters 1 and 2 are linked to and the horn sounds repeatedly for seating positions of memory 1 or 2. 0 30 seconds. The alarm turns off See Memory Seats 58. when the ignition is turned on or 7 Keyless Unlocking/Locking from the Driver Door is pressed again. The ignition must Driver Side Shown, Passenger be off for the panic alarm to work. When the doors are locked and the Side Similar RKE transmitter is within 1 m (3 ft) Pressing the lock/unlock button will Keyless Access Operation of the door handle, pressing the cause all doors to lock if any of the lock/unlock button on the driver door The Keyless Access system allows following occur: for doors and the tailgate to be handle will unlock the driver door. . It has been more than accessed without pressing the RKE If the lock/unlock button is pressed five seconds since the first lock/ transmitter button. The RKE again within five seconds, all unlock button press. transmitter must be within 1 m (3 ft) passenger doors and the tailgate of the tailgate or door being opened. will unlock. . Two lock/unlock button presses If the vehicle has this feature, there were used to unlock all doors. will be a button on the outside door . Any vehicle door has been handles. opened and all doors are now closed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 19 Keyless Unlocking/Locking from times quickly to indicate access is If passive locking is enabled, the the Passenger Doors disabled. Using any exterior handle doors may lock with the RKE When the doors are locked and the to unlock the doors or open the transmitter inside the vehicle. Do RKE transmitter is within 1 m (3 ft) tailgate will cause the turn signal not leave the RKE transmitter in an of the door handle, pressing the lamps to flash four times quickly, unattended vehicle. lock/unlock button on a passenger indicating access is disabled. To customize the doors to door handle will unlock all doors. If disabled, disarm the alarm system automatically lock when exiting the before starting the vehicle. Pressing the lock/unlock button will vehicle, see “Remote Lock, Unlock, cause all doors to lock if any of the Enabling Keyless Unlocking: Start” under Vehicle Personalization 0 following occur: With the vehicle off, press and 156. . The lock/unlock button was used hold Q and K on the RKE Temporary Disable of Passive to unlock all doors. transmitter at the same time for Locking . Any vehicle door has been approximately three seconds. The Temporarily disable passive locking turn signal lamps will flash twice opened and all doors are now by pressing and holding K on the closed. quickly to indicate access is enabled. interior door switch with a door open Disable/Enable Keyless Unlocking for at least four seconds, or until of Exterior Door Handles and Passive Locking three chimes are heard. Passive Tailgate This feature will lock the vehicle locking will then remain disabled If equipped, keyless unlocking of the several seconds after all doors are until Q on the interior door is exterior door handles and tailgate closed, if the vehicle is off and at pressed, or until the vehicle is can be disabled and enabled. least one RKE transmitter has been turned on. removed from the interior, or none Disabling Keyless Unlocking: Remote Left in Vehicle Alert remain in the interior. With the vehicle off, press and When the vehicle is turned off and If other electronic devices interfere hold Q and K on the RKE an RKE transmitter is left in the with the RKE transmitter signal, the vehicle, the horn will chirp three transmitter at the same time for vehicle may not detect the RKE approximately three seconds. The transmitter inside the vehicle. turn signal lamps will flash four GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

20 Keys, Doors, and Windows times after all doors are closed. To so that lost or stolen transmitters no turn on or off see Vehicle longer work. Each vehicle can have Personalization 0 156. up to eight transmitters matched to it. Remote No Longer in Vehicle Alert If the vehicle is on with a door open Programming with Recognized and then all doors are closed, the Transmitters vehicle will check for RKE A new transmitter can be transmitters inside. If an RKE programmed to the vehicle when transmitter is not detected, the there are two recognized Driver Information Center (DIC) will transmitters. display NO REMOTE DETECTED To program, the vehicle must be off and the horn will chirp three times. and all transmitters, both currently Transmitter Pocket without Bucket This occurs only once each time the recognized and new, must be Seats (Lower Compartment) vehicle is driven. To turn on or off with you. see Vehicle Personalization 0 156. 1. Remove the key from a Key Access recognized transmitter. To access a vehicle with a dead 2. Place the two recognized transmitter battery, see Door Locks transmitters in the cupholder or 0 26. on the passenger seat. Programming Transmitters to 3. Insert the vehicle key into the the Vehicle key lock cylinder on the driver door handle. Then turn the key Only RKE transmitters programmed counterclockwise, to the unlock to the vehicle will work. If a position, five times within transmitter is lost or stolen, a 10 seconds. replacement can be purchased and programmed through your dealer. The DIC displays READY FOR The vehicle can be reprogrammed REMOTE#3, 4, 5 ETC. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 21 When all additional transmitters The DIC displays REMOTE are programmed, press and LEARN PENDING, hold ENGINE START/STOP for PLEASE WAIT. approximately 12 seconds to 3. Wait for 10 minutes until the exit programming mode. DIC displays PRESS ENGINE 7. Return the key back into the START BUTTON TO LEARN, transmitter. then press ENGINE START/STOP. Programming without Recognized Transmitters The DIC will again display REMOTE LEARN PENDING, If two currently recognized PLEASE WAIT. transmitters are not available, follow Transmitter Pocket with Bucket this procedure to program up to 4. Repeat Step 3 two additional Seats eight transmitters. This feature is times. After the third time all not available in Canada. This previously known transmitters 4. Place the new transmitter in procedure will take approximately will no longer work with the the transmitter pocket/insert. 30 minutes to complete. The vehicle vehicle. Remaining transmitters 5. Press ENGINE START/STOP. must be off and all transmitters to can be relearned during the When the transmitter is be programmed must be with you. next steps. learned, the DIC display will 1. Remove the vehicle key from The DIC should now display show that it is ready to program the transmitter. READY FOR REMOTE # 1. the next transmitter. 2. Insert the vehicle key into the 6. Remove the transmitter from key lock cylinder on the driver the transmitter pocket and door handle; then turn the key press K or Q on the counterclockwise, to the unlock transmitter. position, five times within To program additional 10 seconds. transmitters, repeat Steps 4–6. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

22 Keys, Doors, and Windows When all additional transmitters are programmed, press and hold ENGINE START/STOP for approximately 12 seconds to exit programming mode. 8. Return the key back into the transmitter. Starting the Vehicle with a Low Transmitter Battery If the transmitter battery is weak or if there is interference with the signal, Transmitter Pocket without Bucket Transmitter Pocket with Bucket the DIC may display NO REMOTE Seats (Lower Compartment) Seats DETECTED or NO REMOTE KEY 5. Place the new transmitter in WAS DETECTED PLACE KEY IN the transmitter pocket/insert. TRANSMITTER POCKET THEN START YOUR VEHICLE when 6. Press ENGINE START/STOP. starting the vehicle. When the transmitter is learned, the DIC display will show that it is ready to program the next transmitter. 7. Remove the transmitter from the transmitter pocket/insert and press K or Q on the transmitter. To program additional transmitters, repeat Steps 5–7. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 23 To start the vehicle: Battery Replacement

{ Warning

Never allow children to play with the RKE transmitter. The transmitter contains a small battery, which can be a choking hazard. If swallowed, internal burns can occur, resulting in severe injury or death. Seek medical attention immediately if a Transmitter Pocket with Bucket battery is swallowed. Transmitter Pocket without Bucket Seats Seats (Lower Compartment) 1. Place the transmitter in the transmitter pocket/insert. { Warning 2. With the vehicle in P (Park) or N (Neutral) press the brake To avoid personal injury, do not pedal and ENGINE touch metal surfaces on the RKE START/STOP. transmitter when it has been Replace the transmitter battery exposed to extreme heat. These as soon as possible. surfaces can be hot to the touch at temperatures above 59 °C (138 °F). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

24 Keys, Doors, and Windows Replace the battery in the Caution transmitter soon if the DIC displays REPLACE BATTERY IN When replacing the battery, do REMOTE KEY. not touch any of the circuitry on the transmitter. Static from your To replace the battery: body could damage the transmitter.

Caution

Always replace the battery with 2. Insert a flat, thin object in the the correct type. Replacing the center of the transmitter to battery with an incorrect type separate and remove the back could potentially create a risk of cover. battery explosion. Dispose of used batteries according to instructions and local laws. Do 1. Press the button on the RKE not attempt to burn, crush, or cut transmitter to remove the key. the used battery, and avoid Never pull the key out without exposing the battery to pressing the button. environments with extremely low air pressures or high temperatures. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 25 3. Lift the battery with a flat Laws in some communities may The engine will turn off during a object. restrict the use of remote starters. remote vehicle start if: 4. Remove the battery. Check local regulations for any . The coolant temperature gets requirements on remote starting of too high. 5. Insert the new battery, positive vehicles. side toward the back cover. . The oil pressure gets low. Do not use remote start if the Replace with a CR2032 or The RKE transmitter range may be equivalent battery. vehicle is low on . The vehicle may run out of fuel. reduced while the vehicle is running. 6. Push together the transmitter. The vehicle cannot be remote Other conditions can affect the 7. Insert the key back into the started if: performance of the transmitter. See RKE transmitter. Remote Keyless Entry (RKE) . The RKE transmitter is inside System 0 13. the vehicle or if the key is in the Remote Vehicle Start ignition. Starting the Engine Using Remote Start If equipped with the remote start . The hood is not closed. feature, the climate control system will come on when the vehicle is . There is an emission control 1. Press and release Q. system malfunction and the lamp started remotely, depending on the 2. Immediately press and hold / is on. outside temperature. until the turn signal lamps flash The rear defog and heated and . The ignition is in any mode other or for at least four seconds. than off. ventilated seats, if equipped, may When the vehicle starts, the also come on. See Heated and . The hazard warning flashers 0 parking lamps will turn on. The Ventilated Front Seats 60 and are on. doors will be locked and the Vehicle Personalization 0 156. . Two remote starts or a remote climate control system may If equipped, the automatic heated start with an extension have come on. steering wheel may also come on. been used. See Heated Steering Wheel 0 119. . The vehicle is not in P (Park). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

26 Keys, Doors, and Windows The engine will continue to run . Turn on the hazard warning for 15 minutes. After flashers. Warning (Continued) 30 seconds, repeat . Turn the ignition on and then off. Steps 1 and 2 for a 15-minute . Young children who get into time extension. unlocked vehicles may be Door Locks unable to get out. A child Turn the ignition on to operate the can be overcome by vehicle. { Warning extreme heat and can suffer Extending Engine Run Time permanent injuries or even Unlocked doors can be death from heat stroke. The engine run time can be dangerous. Always lock the vehicle extended by 15 minutes, for a total whenever leaving it. of 30 minutes, if during the first . Passengers, especially 15 minutes Steps 1 and 2 are children, can easily open . Outsiders can easily enter repeated while the engine is still the doors and fall out of a through an unlocked door running. An extension can be moving vehicle. The doors when you slow down or stop requested 30 seconds after starting. can be unlocked and the vehicle. Locking the opened while the vehicle is doors can help prevent this A maximum of two remote starts, moving. The chance of from happening. or a single start with an extension, being thrown out of the is allowed between ignition cycles. vehicle in a crash is There are several ways to lock and The vehicle's ignition must be increased if the doors are unlock the vehicle. turned on and then back off to use not locked. So, all remote start again. passengers should wear From outside: seat belts properly and the . Use the Remote Keyless Entry Canceling a Remote Start doors should be locked (RKE) transmitter. To cancel a remote start, do one of whenever the vehicle is . Use Keyless Access, the following: driven. if equipped. (Continued) . Press and hold / until the . Use the key in the driver door or parking lamps turn off. the passenger door, if equipped. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 27 From inside, use the power door Power Door Locks When Q is pressed on the power locks or the manual door locks. To door lock switch while the door is lock the door with the manual door open, a chime will sound three locks, push down on the manual times indicating delayed locking is lock knob. active. From inside, pull the door handle The doors will lock automatically once to unlock the door. Pull the five seconds after all doors are handle again to open the door. closed. If a door is reopened before See Vehicle Alarm System 0 36. that time, the five-second timer will reset when all doors are closed Free-Turning Locks again. The door key lock cylinder turns Press on the door lock switch freely when either the wrong key is Q used, or the correct key is not fully again or press Q on the RKE inserted. The free-turning door lock If equipped with power door locks. transmitter to lock the doors feature prevents the lock from being immediately. : Press to lock the doors. forced open. To reset the lock, turn Q K This feature can be programmed. it to the vertical position with the : Press to unlock the doors. See Vehicle Personalization 0 156. correct key fully inserted. Remove the key and insert it again. If this Delayed Locking Automatic Door Locks does not reset the lock, turn the key halfway around in the cylinder and If equipped, this feature delays the If equipped, the doors will lock repeat the reset procedure. locking of the doors until automatically when all doors are five seconds after all doors are closed, the ignition is on, and the closed. vehicle is shifted out of P (Park). Delayed locking can only be turned If a vehicle door is unlocked, and on when the Open Door then opened and closed, the doors Anti-Lockout feature has been will lock either when your foot is turned off. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

28 Keys, Doors, and Windows removed from the brake or the has not reduced, the driver door will vehicle speed becomes faster than unlock and the horn will chirp three 13 km/h (8 mph). times. To unlock the doors: Lockout Protection can be manually overridden with the driver door open . Press K on the power door lock by pressing and holding on the switch. Q power door lock switch. . Shift the transmission into P (Park). Open Door Anti-Lockout Automatic door locking cannot be If equipped, the Open Door disabled. Automatic door unlocking Anti-Lockout is turned on and the can be programmed. See Vehicle vehicle is off, the driver door is Personalization 0 156. open, and locking is requested, all The safety lock is on the inside the doors will lock and the driver edge of the rear doors. To use the Lockout Protection door will unlock. The Open Door safety lock: Anti-Lockout feature can be turned 1. Move the lever down to the If equipped, the ignition is on or in on or off. See Vehicle lock position. ACC/ACCESSORY and the power Personalization 0 156. door lock switch is pressed with the 2. Close the door. driver door open, all the doors will Safety Locks 3. Do the same for the other lock and only the driver door will rear door. unlock. The rear door safety locks prevent passengers from opening the rear If the vehicle is off and locking is doors from inside the vehicle. requested while a door is open, when all doors are closed the vehicle will check to the Keyless Access function (if equipped). If an RKE transmitter is detected and the number of RKE transmitters inside GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 29 To open a rear door when the safety Doors After closing the tailgate, pull it back lock is on: to be sure it is latched securely. 1. Unlock the door by activating Tailgate Some tailgates have an electric the inside handle, by pressing latch. If the battery is disconnected the power door unlock switch, Manual Tailgate or has low voltage, the tailgate will or by using the Remote not open. The tailgate will resume Keyless Entry (RKE) { Warning operation when the battery is transmitter. reconnected or recharged. It is extremely dangerous to ride 2. Open the door from the Power Release Tailgate outside. on the tailgate, even when the vehicle is operated at low speeds. When the safety lock is enabled, People riding on the tailgate can { Warning adults and older children will not be easily lose their balance and fall able to open the rear door from the Make sure there is no one in the in response to vehicle inside. Cancel the safety locks to way of the power tailgate as it is maneuvers. Falling from a moving enable the doors to open from the opening and closing, and keep vehicle may result in serious inside. hands away from the tailgate injuries or death. Do not allow hinges when in use. You or others To cancel the safety lock: people to ride on the tailgate. Be could be injured if caught in the sure everyone in your vehicle is in 1. Unlock the door and open it path of the power tailgate or a seat and using a seat belt from the outside. tailgate hinges. properly. 2. Move the lever up to unlock. Do the same for the other door. Use the key to unlock the tailgate. Caution Open the tailgate by lifting up on its handle while pulling the To avoid damage to the tailgate, tailgate down. make sure the area behind the To shut the tailgate, firmly push it tailgate is clear before opening it. upward until it latches. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

30 Keys, Doors, and Windows In the case of a dead battery, the . Press the touch pad on the tailgate can be opened manually. tailgate handle after unlocking all Contact your dealer or Roadside doors. Use the top of the tailgate Assistance. to pull against if assistance is If equipped, to lock or unlock the required. If equipped with tailgate, use the RKE transmitter or Keyless Access, a locked the key. See Remote Keyless Entry tailgate can be opened if the (RKE) System Operation (Key RKE transmitter is within Access) 0 13 or 1 m (3 ft). Remote Keyless Entry (RKE) To close the tailgate, firmly push it System Operation (Keyless Access) upward until it latches. Pull it back 0 16. to be sure it is latched securely. The vehicle must be in P (Park). . Press 5 on the center stack. MultiPro Tailgate To open the tailgate: { Warning . Press x twice quickly on the RKE transmitter until the tailgate Make sure there is no one in the moves. way of the power tailgate as it is opening and closing, and keep hands away from the tailgate hinges when in use. You or others could be injured if caught in the path of the power tailgate or tailgate hinges. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 31 To open the primary tailgate: Caution

To avoid damage to the tailgate, make sure the area behind the tailgate is clear before opening it.

If equipped with this feature, the vehicle must be in P (Park).

. Press 5 on the center stack. . Press x twice quickly on the . Press the lower touch pad on RKE transmitter until the tailgate the tailgate handle after moves. See Remote Keyless unlocking all doors. Use the top Entry (RKE) System Operation of the tailgate to pull against if (Key Access) 0 13 or assistance is required. Remote Keyless Entry (RKE) To close the primary tailgate, firmly System Operation (Keyless push it upward until it latches. Pull it Access) 0 16. If equipped with back to be sure it is latched Switches in the inner tailgate Keyless Access, the tailgate can securely. prevent the primary tailgate from be opened if the RKE transmitter being opened when the inner is within 1 m (3 ft). tailgate is not fully closed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

32 Keys, Doors, and Windows Tailgate Step Caution

Do not open the inner tailgate { Warning with the primary tailgate open if To avoid personal injury, keep there is a hitch ball or trailer hands away from the hinges attached. This may damage the when operating the tailgate step. tailgate.

With the primary and inner tailgates To close the inner tailgate with the open, the tailgate step can be primary tailgate closed, firmly push lowered to access the pickup bed. or pull it upward until it latches. Pull To open the inner tailgate, press the it back to be sure it is latched Using the Step upper touch pad on the tailgate securely. handle after unlocking all doors. Pull To close the inner tailgate with the Caution the top of the tailgate to open. primary tailgate open: When using the tailgate as a step, . Hold the primary tailgate and the load rating is 170 kg (375 lb), firmly close the inner tailgate. which includes a person and . Raise the inner tailgate so it cargo. Overloading the tailgate meets the primary tailgate and step can cause damage to the close together at the same time. tailgate system. When using the tailgate step as a load stop, the load must be secured as the load could shift. See Cargo Tie-Downs 0 115. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 33 The assist handle helps with entering the pickup box. To use: 1. Lift up on the handle until it locks in the open position. 2. To return the assist handle, pull the release lever toward the ball end of the handle and push the handle back to the closed position. Applying Loads to Tailgates

. To lower the tailgate step, press Do not place a load on top of the Caution the button at the center of the step when using it as a load stop. step. Make sure it lowers to the Do not put ramp loads on the fully open position. Using the Assist Handle inner tailgate alone. Damage to . To close the tailgate step, lift it the inner tailgate may occur. firmly. Make sure that both side latches are engaged. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

34 Keys, Doors, and Windows Power Assist Steps

{ Warning

To avoid personal injury or property damage, before entering or exiting the vehicle, be sure the power assist step is fully extended. Do not step on the power assist step while it is moving. Never place hands or other body parts between the Preferred Method Alternate Method extended power assist step and When applying any load to the the vehicle. tailgate, distribute the weight evenly across the width of the tailgate. This applies to all tailgate types. If equipped, the power assist steps, when enabled, will extend when the . Use a load-distributing door is opened. They will retract member (1). three seconds after the door is . Secure the ramp to the closed or immediately if the vehicle (2). starts moving. Keep hands, children, pets, objects, and clothing clear of the power assist steps when in motion. The steps will reverse direction if there is an obstruction. If possible, carefully remove the obstruction, then open and close the door on the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 35 same side to complete the motion. Center Stack Switch . Press j again to return to If the obstruction is not cleared, the normal operation. assist steps remain extended. Enable/Disable Slight movement of the steps while extended is normal. To enable or disable the power assist steps, press and hold j for Kick Switch four seconds. A DIC message displays. Cleaning Clean the power assist steps regularly. For an automatic wash, extend the steps while in N (Neutral) using the center stack The power assist steps can be switch. The steps will stow when extended to the tire by pressing j. shifting into D (Drive). When extending the steps with j, the kick switch is disabled. The vehicle must be in P (Park) or 1. Place the vehicle in P (Park) N (Neutral). and unlock the doors. To extend the steps: 2. Kick the switch to extend the j power assist step to the tire. . Press to extend both steps. A Driver Information Center A DIC message displays. (DIC) message displays. . Press j again to extend to the 3. Kick the switch again to return tire. A DIC message displays. to normal operation. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

36 Keys, Doors, and Windows Vehicle Security Fast Flash : Vehicle is unsecured. the lights will flash to indicate A door or the hood is open. pre-alarm. If the vehicle is not This vehicle has theft-deterrent Slow Flash : Alarm system is started, or the door is not unlocked features; however, they do not make armed. by pressing K on the RKE the vehicle impossible to steal. transmitter during the 10-second Arming the Alarm System pre-alarm, the alarm will be Vehicle Alarm System 1. Turn off the vehicle. activated. 2. Lock the vehicle in one of The alarm will also be activated if a two ways: passenger door or the hood is opened without first disarming the . Use the RKE transmitter. system. When the alarm is . With a door open, press Q activated, the turn signals flash and on the interior of the door. the horn sounds for about 30 seconds. The alarm system will 3. After 30 seconds, the alarm then re-arm to monitor for the next system will arm and the unauthorized event. indicator light will begin to slowly flash. Pressing Q on the Disarming the Alarm System RKE transmitter a second time To disarm the alarm system or turn will bypass the 30-second off the alarm if it has been activated: The indicator light, on the delay and immediately arm the K instrument panel near the alarm system. . Press on the RKE transmitter. windshield, indicates the status of The vehicle alarm system will not . Start the vehicle. the system. arm if the doors are locked with To avoid setting off the alarm by Off : Alarm system is disarmed. the key. mistake: On Solid : Vehicle is secured If the driver door is opened without . Lock the vehicle after all during the delay to arm the system. first unlocking with the RKE occupants have exited. transmitter, the horn will chirp and GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 37 . Always unlock a door with the The Driver Information Center (DIC) to unbind the column lock. If this RKE transmitter. may display one of these does not unlock the steering Unlocking the driver door with messages: column, turn the vehicle off and the key will not disarm the . A message to service the open the driver door to reset the system or turn off the alarm. steering column lock indicates system. Then turn the vehicle on that an issue has been detected and immediately turn the How to Detect a Tamper with the column lock feature and steering wheel side to side for Condition the vehicle should be serviced. about 15 seconds. In some cases, it may take significant If K is pressed on the RKE . A message that the steering force to unbind the column. transmitter and the horn chirps three column is locked indicates that To keep the steering column from times, an alarm occurred previously the engine is running, but the binding, straighten the front while the alarm system was armed. steering column is still locked. It is normal for the column to be before turning off the vehicle. If the alarm has been activated, a locked during a remote start, but message will appear on the DIC. the column should unlock after Immobilizer Steering Column Lock the brake pedal is pressed and See Radio Frequency Statement the vehicle is started. No 0 472. If equipped, the steering column message will display during a lock is a theft-deterrent device. This remote start. Immobilizer Operation feature locks the steering column . A message that the steering when the vehicle is turned off and wheel must be turned and the the driver door is opened, or when vehicle must be started again the driver door is opened and then indicates that the column lock the vehicle is turned off. The mechanism is bound, the column steering column unlocks when the locking device was unable to vehicle is turned on. unlock the steering column, and the vehicle did not start. If this This vehicle has a passive happens, immediately turn the theft-deterrent system. steering wheel from side to side GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

38 Keys, Doors, and Windows The system does not have to be If the vehicle will not change ignition It is possible for the immobilizer manually armed or disarmed. modes (ACC/ACCESSORY, on, off), system to learn new or replacement The vehicle is automatically and the RKE transmitter appears to RKE transmitters. Up to eight immobilized when the vehicle is be undamaged, try another transmitters can be programmed for turned off. transmitter. Or, you may try placing the vehicle. To program additional the transmitter in the transmitter transmitters, see "Programming The system is automatically pocket located in the center Transmitters to the Vehicle" under disarmed when the ignition is turned console. See Remote Keyless Entry Remote Keyless Entry (RKE) from off to on. (RKE) System Operation (Key System Operation (Key Access) 0 0 The security light, in the instrument Access) 13 or 13 or cluster, comes on if there is a Remote Keyless Entry (RKE) Remote Keyless Entry (RKE) problem with arming or disarming System Operation (Keyless Access) System Operation (Keyless Access) 0 0 the theft-deterrent system. 16. 16 The system has one or more RKE If the ignition mode will not change Do not leave the transmitter or transmitters matched to an with the other transmitter or with the device that disarms or deactivates immobilizer control unit in your transmitter in the transmitter pocket, the vehicle theft system in the vehicle. Only a correctly matched your vehicle needs service. If the vehicle. RKE transmitter will start the ignition does change modes, the When equipped with a key, if the vehicle. If the transmitter is ever first transmitter may be faulty. See engine still does not start, and the damaged, you may not be able to your dealer who can service the key appears to be undamaged, try start your vehicle. theft-deterrent system and have a another ignition key. It may be new RKE transmitter programmed to When trying to start the vehicle, the necessary to check the fuse. See the vehicle. 0 security light may come on briefly Fuses and Circuit Breakers 370. when the ignition is turned on. If the If the engine still does not start with engine does not start and the the other key, the vehicle needs security light stays on, there is a problem with the system. Turn the ignition off and try again. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 39 service. If the vehicle does start, the Exterior Mirrors Trailer-Tow Mirrors first key may be faulty. See your The upper portion of both the driver dealer. It is possible for the and passenger mirrors is flat. immobilizer system to learn new or Convex Mirrors replacement keys. Up to eight keys The lower portion of both the driver can be programmed for the vehicle. { Warning and passenger mirrors is convex. To program additional keys, see A convex mirror’s surface is curved Keys (Key Access) 0 9 or A convex mirror can make things, so more can be seen from the driver Keys (Keyless Access) 0 12. Do not like other vehicles, look farther seat. The lower portion is adjusted leave the key or device that disarms away than they really are. If you manually. or deactivates the vehicle theft cut too sharply into the right lane, system in the vehicle. you could hit a vehicle on the Manual Mirrors See your dealer to get a new key right. Check the inside mirror or If equipped, adjust manual mirrors blank cut exactly as the ignition key glance over your shoulder before by moving the mirror up and down that operates the system. changing lanes. or left to right to see a little of the side of the vehicle and to have a Standard Mirrors clear view behind the vehicle. The passenger side mirror is convex Using hood-mounted air deflectors shaped. A convex mirror's surface is and add-on convex mirror curved so more can be seen from attachments could decrease mirror the driver seat. performance. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

40 Keys, Doors, and Windows Trailer-Tow Mirrors Manual Extend : If equipped, grasp the mirror housing firmly and pull back in one motion, arching slightly toward the rear of the vehicle.

Extending Mirrors Trailer tow mirrors can extend out for better visibility when towing a To return the mirror to its original trailer. position, reverse the motion. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 41 If a popping noise from the mirror is Power Mirrors heard, this sound is normal as the manual detents are aligning after a manual extend/retract operation has occurred. Auxiliary Cargo Mirror Lamps If equipped, cargo mirror lamps face rearward to provide more light on the sides of the vehicle, if needed. See Exterior Cargo Lamps 0 171. Advanced Trailering Vision Power Extend : If equipped, press System Side Cameras the power extend button to fully extend the mirror. Press again to If equipped, the Advanced Trailering retract. Vision System side cameras are on To adjust each mirror: the bottom of the outside mirrors. 1. Press j or to select the Resetting the Power Extend See “Surround Vision (360 | Mirrors Degrees)” under Assistance driver or passenger side mirror. The indicator light will Reset the power extend mirrors if: Systems for Parking or Backing 0 257. illuminate. . The mirrors are accidentally 2. Press the arrows on the control obstructed while extending/ pad to move the mirror in the retracting. desired direction. . The mirrors are accidentally 3. Adjust each outside mirror so manually extended/retracted. that a little of the vehicle and . The mirrors vibrate at normal the area behind it can be seen. driving speeds. 4. Press j or | again to deselect the mirror. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

42 Keys, Doors, and Windows Turn Signal Indicator Folding Mirrors If equipped with power folding mirrors: If equipped, the mirror has turn Manual Folding Mirrors signal indicator lights, which flash in 1. Press g to fold the mirrors in the direction of the turn or lane If equipped, push the mirror toward to the folded position. change. the vehicle to fold. Push the mirror outward to return to its original 2. Press g again to fold the Task Lighting position. mirrors out to the driving If equipped, task lighting projects Manually fold the mirrors inward to position. light from the outside mirrors to the prevent damage when going Resetting the Power Folding sides of the vehicle. See Task through an automatic car wash. Lighting 0 171. Mirrors Power Folding Mirrors Reset the power folding mirrors if: Puddle Lamps . The mirrors are accidentally If equipped, puddle lamps project obstructed while folding. light from the bottom of the mirror to the area of ground below the driver . The mirrors are accidentally and passenger doors. See Entry manually folded/unfolded. 0 Lighting 173 and . The mirrors will not stay in the 0 Exit Lighting 173. unfolded position. Memory Mirrors . The mirrors vibrate at normal The vehicle may have memory driving speeds. mirrors. See Memory Seats 0 58. Manually fold both mirrors if they Lane Change Alert (LCA) are out of sync. Fold and unfold the mirrors three times using the mirror The vehicle may have LCA. See controls to reset them to their Lane Change Alert (LCA) 0 274. normal position. A popping noise may be heard. This sound is normal after a manual folding operation. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 43 Remote Mirror Folding Automatic Dimming Driving with the Blind Spot Mirror If equipped, press and hold Q on Mirror the RKE transmitter for If equipped, the driver outside mirror approximately one second to automatically adjusts for the glare of remotely fold the exterior mirrors. the from behind. This Press and hold K on the RKE feature comes on when the vehicle transmitter for approximately is started. one second to unfold. See Remote Keyless Entry (RKE) System Blind Spot Mirrors Operation (Key Access) 0 13 or Remote Keyless Entry (RKE) If equipped, there is a small convex System Operation (Keyless Access) mirror built into the upper and outer 0 16. corner of the driver outside mirror. It can show objects that may be in This feature can be turned on or off. the vehicle's blind zone. See Vehicle Personalization 0 156. Heated Mirrors If equipped with heated mirrors: 1 REAR : Press to heat the outside mirrors. See “Rear Window Defogger” under Dual Automatic Climate Control System 0 179.

Actual Mirror View GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

44 Keys, Doors, and Windows 1. When the approaching vehicle mirror for a vehicle in the blind Interior Mirrors is a long distance away, the zone. Then, glance over your image in the main mirror is shoulder to double check small and near the inboard before moving slowly into the Interior Rearview Mirrors edge of the mirror. adjacent lane. Adjust the rearview mirror for a clear 2. As the vehicle gets closer, the view of the area behind your image in the main mirror gets Reverse Tilt Mirrors vehicle. larger and moves outboard. If equipped with memory seats, the Do not spray glass cleaner directly 3. As the vehicle enters the blind passenger and/or driver mirror tilts on the mirror. Use a soft towel zone, the image transitions to a preselected position when the dampened with water. from the main mirror to the vehicle is in R (Reverse). This blind spot mirror. allows the curb to be seen when Manual Rearview Mirror parallel parking. 4. When the vehicle is in the blind If equipped, push the tab forward for zone, the image only appears The mirror(s) return to the original daytime use and pull it rearward for in the blind spot mirror. position when: nighttime use to avoid glare from the headlamps from behind. Using the Outside Mirror with . The vehicle is shifted out of R (Reverse), or remains in the Blind Spot Mirror R (Reverse) for about Automatic Dimming 1. Set the main mirror so that the 30 seconds. Rearview Mirror side of the vehicle can just be . The ignition is turned off. seen and the blind spot mirror If equipped, the mirror will has an unobstructed view. . The vehicle is driven in automatically reduce the glare of the R (Reverse) above a set speed. headlamps from behind. The 2. When checking for traffic or dimming feature comes on each before changing a lane, look at To turn this feature on or off, see time the vehicle is started. the main driver/passenger side Vehicle Personalization 0 156. mirror to observe traffic in the adjacent lane, behind your vehicle. Check the blind spot GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 45 Rear Camera Mirror If equipped, this automatic dimming mirror provides a wide angle camera view of the area behind the vehicle.

Press V to scroll through the . Brightness adjustment options. Press t and u to adjust the settings using the indicators on the mirror. The indicators will remain Pull the tab to turn on the display. visible for five seconds after the last Push the tab to turn it off. When off button activation, and the settings the mirror is automatic dimming. will remain saved. Adjust the mirror for a clear view of the area behind the vehicle while The adjustment options are: the display is off.

. Zoom GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

46 Keys, Doors, and Windows Troubleshooting { Warning

The Rear Camera Mirror (RCM) has a limited view. Portions of the road, vehicles, and other objects may not be seen. Do not drive or park the vehicle using only this camera. Objects may appear closer than they are. Check the outside mirrors or glance over your shoulder when making lane changes or merging. Failure to . Tilt use proper care may result in injury, death, or vehicle damage. See your dealer for service if a blue screen and 3 are displayed in the mirror, and the display shuts off. Also, push the tab as indicated to return to the automatic dimming mode. The Rear Camera Mirror may not work properly or display a clear image if: . There is glare from the sun or headlamps. This may obstruct objects from view. If needed, push the tab to turn off the display. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 47 . Dirt, snow, or other debris blocks Windows The vehicle aerodynamics are the camera lens. Clean the lens designed to improve fuel economy with a soft damp cloth. performance. This may result in a { Warning pulsing sound when either rear . The camera’s mounting on the vehicle has been damaged, and/ window is down and the front Never leave a child, a helpless windows are up. To reduce the or the position or the mounting adult, or a pet alone in a vehicle, angle of the camera has sound, open either a front window especially with the windows or the sunroof, if equipped. changed. closed in warm or hot weather. They can be overcome by the Manual Windows extreme heat and suffer permanent injuries or even death If equipped, turn the hand crank on from heat stroke. each door to manually raise or lower the manual windows. Power Windows

{ Warning

Children could be seriously injured or killed if caught in the path of a closing window. Never leave the Remote Keyless Entry (RKE) transmitter or keys in a vehicle with children. When there are children in the rear seat, use the window lockout button to (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

48 Keys, Doors, and Windows The windows may be temporarily Windows Express Movement Warning (Continued) disabled if they are used repeatedly All windows can be opened without within a short time. prevent operation of the windows. holding the window switch. Press See Keys (Key Access) 0 9 or Window Lockout the switch down fully and quickly Keys (Keyless Access) 0 12. release to express open the window. If equipped, pull the window switch up fully and quickly release to express close the window. Briefly press or pull the window switch in the same direction to stop that window’s express movement. Express Window Down L: If equipped, this button will be on the center stack. With Power Folding Mirrors, L Without Similar Press and hold to open all windows. Release L to stop all This feature stops the rear door The power windows work when the movement. passenger window switches from ignition is on, in ACC/ACCESSORY, working except from the driver Use the power window switches to or when Retained Accessory Power position. close each window. (RAP) is active. See Retained Accessory Power (RAP) 0 216. Press 2 to engage the rear Window Automatic Reversal Using the window switch, press to window lockout feature. The System open or pull to close the window. indicator light is on when engaged. The express-close feature will Press 2 again to disengage. reverse window movement if it comes in contact with an object. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 49 Extreme cold or ice could cause the Programming the Power Rear Windows window to auto-reverse. The Windows window will operate normally after Power Sliding Rear Window the object or condition is removed. Programming may be necessary if the vehicle battery has been Automatic Reversal System disconnected or discharged. If the Override window is unable to express-up, program each express-close { Warning window: 1. Close all doors. If automatic reversal system override is active, the window will 2. Turn the ignition on or to ACC/ ACCESSORY. not reverse automatically. You or others could be injured and the 3. Partially open the window to be window could be damaged. programmed. Then close it and Before using automatic reversal continue to pull the switch system override, make sure that briefly after the window has fully closed. If equipped, the power sliding rear all people and obstructions are window works when the ignition has clear of the window path. 4. Open the window and continue been turned on or to ACC/ to press the switch briefly after ACCESSORY, or Retained When the engine is on, override the the window has fully opened. Accessory Power (RAP) must be automatic reversal system by pulling Remote Window Operation active. See Retained Accessory and holding the window switch if Power (RAP) 0 216. conditions prevent it from closing. If equipped, this feature allows the windows to be opened remotely. . Press the switch to open the If enabled in vehicle personalization, window. press and hold K on the RKE . Pull the switch to close the transmitter. See Vehicle window. Personalization 0 156. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

50 Keys, Doors, and Windows The power sliding rear window Roof Slide Switch cannot be operated manually. Express-Open/Express-Close : To Sunroof express-open the sunroof, Sun Visors fully press and release I (1). Press and release I (1) again to stop the movement. To express-close the sunroof, fully press and release K (1). Press and release K (1) again to stop the movement. Open/Close (Manual Mode) : To open the sunroof, press and hold I Pull the down to block (1). Release I (1) to stop the glare. If equipped, detach the sun movement. Press and hold K (1) visor from the center mount to pivot to close the sunroof. Release to the side window or to extend 1. SLIDE Switch along the rod. 2. TILT Switch K (1) to stop the movement. If equipped, there is a lighted mirror If equipped, the sunroof operates Tilt Switch on the sun visor. Lift the cover when the ignition is on or in ACC/ Vent : From the closed position, to open. ACCESSORY, or when Retained press J (2) to vent the sunroof. Accessory Power (RAP) is active. See Retained Accessory Power Press K (2) to close the vent. (RAP) 0 216. When the sunroof is opened, an air deflector will automatically raise. The air deflector will retract when the sunroof is closed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Keys, Doors, and Windows 51 The sunroof also has a sunshade, Dirt and debris may collect on the which can be pulled forward to block sunroof seal or in the track. This sun rays. The sunshade must be could cause an issue with sunroof opened and closed manually. operation or noise. It could also plug the water drainage system. Automatic Reversal System Periodically open the sunroof and The sunroof has an automatic remove any obstacles or loose reversal system that is only active debris. Wipe the sunroof seal and when the sunroof is operated in roof sealing area using a clean express-close mode. cloth, mild soap, and water. Do not remove grease from the sunroof If an object is in the path while tracks. express-closing, the reversal system will detect an object, stop, and open If water is seen dripping into the the sunroof slightly. water drainage system, this is normal. If frost or other conditions prevent closing, override the feature by closing the sunroof in manual mode. To stop movement, release K (1). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

52 Seats and Restraints Seat Belt Care ...... 70 Replacing LATCH System Seats and Replacing Seat Belt System Parts After a Crash ...... 104 Restraints Parts after a Crash ...... 71 Securing Child Restraints (With the Seat Belt in the Airbag System Rear Seat) ...... 104 Airbag System ...... 71 Securing Child Restraints (In Head Restraints Where Are the Airbags? ...... 73 Head Restraints ...... 53 the Center Front Seat) ...... 107 When Should an Airbag Securing Child Restraints (With Front Seats Inflate? ...... 75 the Seat Belt in the Front Seat Adjustment ...... 54 What Makes an Airbag Outboard Seat) ...... 108 Center Seat ...... 55 Inflate? ...... 75 Adjustment ...... 55 How Does an Airbag Lumbar Adjustment ...... 56 Restrain? ...... 76 Reclining Seatbacks ...... 56 What Will You See after an Memory Seats ...... 58 Airbag Inflates? ...... 76 Heated and Ventilated Front Passenger Sensing System . . . 77 Seats ...... 60 Servicing the Airbag-Equipped Vehicle ...... 82 Rear Seats Adding Equipment to the Rear Seats ...... 62 Airbag-Equipped Vehicle . . . . . 82 Heated Rear Seats ...... 63 Airbag System Check ...... 83 Replacing Airbag System Parts Seat Belts after a Crash ...... 83 Seat Belts ...... 64 How to Wear Seat Belts Child Restraints Properly ...... 65 Older Children ...... 84 Lap-Shoulder Belt ...... 67 Infants and Young Children . . . . 86 Seat Belt Use During Child Restraint Systems ...... 88 Pregnancy ...... 69 Where to Put the Restraint . . . . . 90 Seat Belt Extender ...... 70 Lower Anchors and Tethers for Safety System Check ...... 70 Children (LATCH System) . . . . 91 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 53 Head Restraints

{ Warning

With head restraints that are not installed and adjusted properly, there is a greater chance that occupants will suffer a neck/ spinal injury in a crash. Do not drive until the head restraints for all occupants are installed and adjusted properly. Adjust the head restraint so that the To raise or lower the head restraint, top of the restraint is at the same press the button on the side of the Front Seats height as the top of the occupant's head restraint and pull up or push The vehicle's front seats have head. This position reduces the the head restraint down and release adjustable head restraints in the chance of a neck injury in a crash. the button. outboard seating positions. Pull and push on the head restraint after the button is released to make sure that it is locked in place. The front seat outboard head restraints are not removable. Rear Head Restraints The vehicle’s rear seat has head restraints in the outboard seating positions that cannot be adjusted. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

54 Seats and Restraints Center Headrest Front Seats The vehicle’s rear seat may be equipped with a headrest in the Seat Adjustment center seating position that cannot be adjusted. { Warning If you are installing a child restraint in the rear seat, see Lower Anchors You can lose control of the and Tethers for Children (LATCH vehicle if you try to adjust a driver System) 0 91. seat while the vehicle is moving. Adjust the driver seat only when the vehicle is not moving. The head restraint can be folded forward to allow for better visibility when the rear seat is unoccupied. To fold the head restraint, press the button on the side of the head restraint. When an occupant is in the seat, always return the head restraint to the upright position until it locks into place. Push and pull on the head restraint to make sure that it is locked. If you are installing a child restraint in the rear seat, see Lower Anchors and Tethers for Children (LATCH System) 0 91. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 55 To adjust a manual seat: Power Seat Adjustment 1. Pull the handle at the front of the seat. 2. Slide the seat to the desired position and release the handle. 3. Try to move the seat back and forth to be sure it is locked in place. To adjust the seatback, see Reclining Seatbacks 0 56. Pull the strap on the side of the To adjust the lumbar support, center seatback to fold the center if equipped, see Lumbar Adjustment seatback. Do not use the center 0 56. To adjust a power seat, if equipped: seatback as a seating position when the seatback is folded down. . Move the seat forward or Center Seat rearward by sliding the control To raise the seatback, push the forward or rearward. If equipped, the center front seatback rearward until it locks in seatback doubles as an and the upright position. Push and pull . Raise or lower the front part of cupholder/storage area for the driver on the seatback to make sure it is the seat cushion by moving the and passenger when the center locked. front of the control up or down. front seat is not used. . Raise or lower the seat by moving the rear of the control up or down. To adjust the seatback, see Reclining Seatbacks 0 56. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

56 Seats and Restraints To adjust the lumbar support, see To adjust the lumbar support, Lumbar Adjustment 0 56. if equipped: Warning (Continued) Some vehicles are equipped with a . Press and hold the control For proper protection when the feature that activates a vibrating forward to increase or rearward vehicle is in motion, have the pulse alert in the driver seat to help to decrease upper and lower seatback upright. Then sit well the driver avoid crashes. See Driver lumbar support at the same time. back in the seat and wear the 0 Assistance Systems 255. seat belt properly. Reclining Seatbacks Lumbar Adjustment Power Lumbar { Warning Sitting in a reclined position when the vehicle is in motion can be dangerous. Even when buckled up, the seat belts cannot do their job. The shoulder belt will not be against your body. Instead, it will be in front of you. In a crash, you could go into it, receiving neck or other injuries. Do not have a seatback reclined if The lap belt could go up over the vehicle is moving. your abdomen. The belt forces would be there, not at your pelvic bones. This could cause serious internal injuries. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 57 Manual Reclining Seatbacks To adjust a manual seatback: Power Reclining Seatbacks 1. Lift the lever. { Warning The seatback will automatically If either seatback is not locked, it fold forward. could move forward in a sudden 2. To recline, move the seatback stop or crash. That could cause rearward to the desired injury to the person sitting there. position, then release the lever Always push and pull on the to lock the seatback in place. seatbacks to be sure they are 3. Push and pull on the seatback locked. to make sure it is locked. To return the seatback to the upright position: 1. Lift the lever fully without To recline a power seatback, applying pressure to the if equipped: seatback, and the seatback will return to the upright position. . Tilt the top of the control rearward to recline. 2. Push and pull on the seatback to make sure it is locked. . Tilt the top of the control forward to raise. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

58 Seats and Restraints Memory Seats 2, or B (Exit) until two beeps Vehicle Personalization Settings sound. To manually recall these . To have the Seat Entry Memory positions, press and hold 1, 2, or B movement begin when the until the saved position is reached. vehicle is started, select the Follow the instructions under Settings menu, then Vehicle, “Saving Memory Positions.” then Seating Position, and then Seat Entry Memory. Select On or The vehicle identifies the current Off. See “Seat Entry Memory” driver’s RKE transmitter number later in this section. (1–8). See Remote Keyless Entry (RKE) System Operation (Key . To begin Seat Exit Memory Access) 0 13 or movement when the vehicle is Remote Keyless Entry (RKE) turned off and the driver door is System Operation (Keyless Access) opened, or when the vehicle is 0 16. Only RKE transmitters 1 and 2 turned off with the driver door If equipped, memory seats allow two can be used for automatic memory already opened, select the drivers to save and recall their recalls. A Driver Information Center Settings menu, then Vehicle, unique seat positions for driving the (DIC) welcome message indicating then Seating Position, and then vehicle, and a shared exit position the transmitter number may display Seat Exit Memory. Select On or for getting out of the vehicle. Other for the first few ignition cycles Off. See “Seat Exit Memory” feature positions may also be following a transmitter change. For later in this section. saved, such as power mirrors, Seat Entry Memory to work properly, . See Vehicle Personalization if equipped. Memory positions are save the positions to the memory 0 156 for additional setting linked to RKE transmitter 1 or 2 for button (1 or 2) matching the RKE information. automatic memory recalls. transmitter number displayed in the Identifying Driver Number Before saving, adjust all available DIC welcome message. Carry the memory feature positions. Turn the linked RKE transmitter when To identify the driver number: entering the vehicle. vehicle on and then press and 1. Move your RKE transmitter release SET; a beep will sound. away from the vehicle. Then immediately press and hold 1, GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 59 2. Start the vehicle with another 4. Immediately press and hold the Manually Recalling Memory key or RKE transmitter. The 1 or 2 memory button matching Positions DIC should display the driver the above DIC welcome B number for the other RKE message until two beeps Press and hold 1, 2, or to recall transmitter. Turn the vehicle off sound. the previously saved memory positions if you are driver 1 or 2 and remove the key or RKE If too much time passes transmitter from the vehicle. identified in the DIC welcome between releasing SET and message. 3. Start the vehicle with the initial pressing 1, the memory key or RKE transmitter. The position will not be saved and To stop Manual Memory recall DIC should display the driver two beeps will not sound. movement, release 1, 2, or B or number of your RKE Repeat Steps 3 and 4. press any of the following controls: transmitter. 1 or 2 corresponds to the driver . Power seat number. See Identifying Driver Saving Memory Positions “ . Memory SET Number” previously in this Read these instructions completely section. . Power mirror, with the driver or before saving memory positions. passenger side mirror selected 5. Repeat Steps 1–4 for a second To save preferred driving positions driver using 1 or 2. RKE Seat Entry Memory 1 and 2: transmitters 3–8 will not save The vehicle identifies the number of 1. Turn the vehicle on or to ACC/ memory positions. the current driver’s RKE transmitter ACCESSORY. To save the position for B and (1–8). See Remote Keyless Entry A DIC welcome message may Seat Exit Memory features, repeat (RKE) System Operation (Key indicate driver number 1 or 2. Access) 0 13 or Steps 1–4 using B. This saves the 2. Adjust all available memory Remote Keyless Entry (RKE) position for getting out of the System Operation (Keyless Access) features to the desired driving vehicle. 0 position. 16. If the RKE transmitter is 1 or Save preferred memory feature 2, and Seat Entry Memory is 3. Press and release SET; a beep positions to both 1 and 2 if you are enabled in vehicle personalization, will sound. the only driver. the positions saved to the same GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

60 Seats and Restraints memory button number 1 or 2 are (1 or 2) may not match the memory . Power mirror, with the driver or automatically recalled when the button number that positions were passenger side mirror selected vehicle is turned on, or turned from saved to. Try storing the position to off to ACC/ACCESSORY. RKE the other memory button or try the Obstructions transmitters 3–8 will not provide other RKE transmitter. If something has blocked the driver automatic memory recalls. seat while recalling a memory Seat Exit Memory To turn Seat Entry Memory on or off, position, the recall may stop. Seat Exit Memory is not linked to an Remove the obstruction and try the see “Vehicle Personalization RKE transmitter. The position saved recall again. If the memory position Settings” previously in this section and Vehicle Personalization 0 156. to B is used for all drivers. To turn still does not recall, see your dealer. Seat Exit Memory on or off, see The shift lever must be in P (Park) "Vehicle Personalization Settings" Heated and Ventilated to start Seat Entry Memory. Seat previously in this section and Front Seats Entry Memory recall will complete if Vehicle Personalization 0 156. the vehicle is shifted out of P (Park) prior to reaching the saved memory If turned on, the position saved to { Warning position. B is automatically recalled when one of the following occurs: If temperature change or pain to To stop Seat Entry Memory recall the skin cannot be felt, the seat . The vehicle is turned off and the movement, turn the vehicle off or heater may cause burns. To press any of the following controls: driver door is opened within a short time. reduce the risk of burns, use care . Power seat when using the seat heater, . The vehicle is turned off with the especially for long periods of . Memory SET, 1, 2, or B driver door open. time. Do not place anything on . Power mirror, with the driver or To stop Seat Exit Memory the seat that insulates against passenger side mirror selected movement, press any of the heat, such as a blanket, cushion, If the saved memory seat position following memory controls: cover, or similar item. This may does not automatically recall or . Power seat cause the seat heater to recalls to the wrong positions, the (Continued) driver’s RKE transmitter number . Memory SET, 1, 2, or B GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 61 Press J or z to heat the driver or stack to turn auto heated seats off. Warning (Continued) passenger seat cushion and If the passenger seat is unoccupied, seatback. the auto heated seats feature will overheat. An overheated seat not activate that seat. The auto heater may cause a burn or may Press C or { to ventilate the driver heated seats feature can be damage the seat. or passenger seat. programmed to always be enabled when the vehicle is on. See Vehicle The indicator light on the button 0 comes on when this feature is on. Personalization 156. Press the button once for the Remote Start Heated and highest setting. With each press of Ventilated Seats the button, the seat will change to If equipped, the heated seats will the next lower setting, and then to turn on automatically during a the off setting. The indicator lights remote start if it is cold outside and next to the buttons indicate three for the ventilated seats will turn on the highest setting and one for the automatically if it is hot outside. lowest. If the heated seats are on If equipped, the heated steering high for an extended time, their level wheel will turn on automatically may automatically be lowered. during a remote start if it is cold outside. The heated and ventilated Heated and Ventilated Seat Auto Heated Seats seat indicators and heated steering Buttons Shown, Heated Seat When the vehicle is on, this feature wheel indicator may not come on Buttons Similar will automatically activate the during this operation. If equipped, the buttons are on the heated seats at the level required by center stack. To operate, the engine the vehicle’s interior temperature. must be running. The active high, medium, low, or off heated seat level will be indicated Press I or + to heat the driver or by the manual heated seat buttons passenger seatback only. on the center stack. Use the manual heated seat buttons on the center GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

62 Seats and Restraints The heated and ventilated seats Rear Seats the vehicle through the rear door and heated steering wheel may and left the vehicle without the cancel when the vehicle is started. Rear Seat Reminder vehicle being shut off. These features can be manually If equipped, the message REAR The feature can be turned on or off. selected after the ignition is See Vehicle Personalization 0 156. turned on. SEAT REMINDER LOOK IN REAR SEAT displays under certain Folding the Rear Seat Cushion The temperature performance of an conditions indicating there may be unoccupied seat may be reduced. an item or passenger in the rear Either side of the rear seat cushion This is normal. seat. Check before exiting the can be folded up for added cargo The heated or ventilated seats will vehicle. space. not turn on during a remote start This feature will activate when a unless they are enabled in vehicle second row door is opened while Caution personalization. See Remote the vehicle is on or up to 10 minutes Vehicle Start 0 25 and before the vehicle is turned on. Folding a rear seat with the seat Vehicle Personalization 0 156. There will be an alert when the belts still fastened may cause vehicle is turned off. The alert does damage to the seat or the seat not directly detect objects in the rear belts. Always unbuckle the seat seat; instead, under certain belts and return them to their conditions, it detects when a rear normal stowed position before door is opened and closed, folding a rear seat. indicating that there may be something in the rear seat. Make sure that nothing is on the The feature is active only once each seat cushion. time the vehicle is turned on and off, and will require reactivation by opening and closing the second row doors. There may be an alert even when there is nothing in the rear seat; for example, if a child entered GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 63

Warning (Continued)

sure that the seat belts are properly routed and attached, and are not twisted.

Heated Rear Seats

{ Warning

If you cannot feel temperature To fold the seat, slowly pull the seat change or pain to the skin, the If available, the buttons are on the cushion up. seat heater may cause burns. rear of the center console. To operate, the engine must be See the Warning under Heated To return the seat to the normal running. seating position, slowly pull the seat and Ventilated Front Seats 0 60. cushion down. Press M or L to heat the left or right outboard seat cushion. An { Warning indicator on the climate control display appears when this feature A seat belt that is improperly is on. routed, not properly attached, or twisted will not provide the protection needed in a crash. The person wearing the belt could be seriously injured. After raising the rear seatback, always check to be (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

64 Seats and Restraints This feature turns on at the highest Seat Belts setting. With each press of the Warning (Continued) button, the heated seat changes to This section describes how to use the next lower setting, and then the seat belts properly, and some things passengers to ride in any area of off setting. Three lights indicate the not to do. the vehicle that is not equipped highest setting, and one light with seats and seat belts. indicates the lowest. If the heated { Warning Always wear a seat belt, and seats are on high, the level may check that all passenger(s) are automatically be lowered after Do not let anyone ride where a restrained properly too. approximately 30 minutes. seat belt cannot be worn properly. In a crash, if you or your passenger(s) are not wearing This vehicle has indicators as a reminder to buckle the seat belts. seat belts, injuries can be much See Seat Belt Reminders 0 135. worse than if you are wearing seat belts. You can be seriously Why Seat Belts Work injured or killed by hitting things inside the vehicle harder or by being ejected from the vehicle. In addition, anyone who is not buckled up can strike other passengers in the vehicle. It is extremely dangerous to ride in a cargo area, inside or outside of a vehicle. In a collision, passengers riding in these areas are more likely to be seriously injured or killed. Do not allow (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 65 When riding in a vehicle, you travel Q: If my vehicle has airbags, why It is very important for all occupants as fast as the vehicle does. If the should I have to wear seat to buckle up. Statistics show that vehicle stops suddenly, you keep belts? unbelted people are hurt more often going until something stops you. A: Airbags are supplemental in crashes than those who are It could be the windshield, the systems only. They work with wearing seat belts. instrument panel, or the seat belts! seat belts — not instead of them. There are important things to know When you wear a seat belt, you and Whether or not an airbag is about wearing a seat belt properly. the vehicle slow down together. provided, all occupants still have There is more time to stop because to buckle up to get the most you stop over a longer distance and, protection. when worn properly, your strongest Also, in nearly all states and in bones take the forces from the seat all Canadian provinces, the law belts. That is why wearing seat belts requires wearing seat belts. makes such good sense. Questions and Answers About How to Wear Seat Belts Seat Belts Properly Q: Will I be trapped in the vehicle Follow these rules for everyone's after a crash if I am wearing a protection. seat belt? There are additional things to know A: You could be — whether you are about seat belts and children, . Sit up straight and always keep wearing a seat belt or not. Your including smaller children and your feet on the floor in front of chance of being conscious infants. If a child will be riding in the you (if possible). during and after a crash, so you vehicle, see Older Children 0 84 or . Always use the correct buckle can unbuckle and get out, is Infants and Young Children 0 86. for your seating position. much greater if you are belted. Review and follow the rules for . Wear the lap part of the belt low children in addition to the following and snug on the hips, just rules. touching the thighs. In a crash, GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

66 Seats and Restraints this applies force to the strong pelvic bones and you would be less likely to slide under the lap belt. If you slid under it, the belt would apply force on your abdomen. This could cause serious or even fatal injuries. . Wear the shoulder belt over the shoulder and across the chest. These parts of the body are best able to take belt restraining forces. The shoulder belt locks if there is a sudden stop or crash.

{ Warning

You can be seriously injured, or even killed, by not wearing your seat belt properly.

Never allow the lap or shoulder belt Never wear the shoulder belt under to become loose or twisted. both arms or behind your back. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 67

{ Warning

The seat belt can be pinched if it is routed under plastic trim on the seat, such as trim around the rear seatback folding handle or side airbag. In a crash, pinched seat belts might not be able to provide adequate protection. Never allow seat belts to be routed under plastic trim pieces. Always use the correct buckle for 2. Pick up the latch plate and pull your seating position. Lap-Shoulder Belt the belt across you. Do not let it get twisted. All seating positions in the vehicle have a lap-shoulder belt. The lap-shoulder belt may lock if you pull the belt across you The following instructions explain very quickly. If this happens, let how to wear a lap-shoulder belt the belt go back slightly to properly. unlock it. Then pull the belt 1. Adjust the seat, if the seat is across you more slowly. adjustable, so you can sit up If the shoulder portion of a straight. To see how, see passenger belt is pulled out all “Seats” in the Index. the way, the child restraint locking feature may be engaged. See Child Restraint Systems 0 88. If this occurs, let Never route the lap or shoulder belt the belt go back all the way over an armrest. and start again. If the locking GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

68 Seats and Restraints feature stays engaged after If the webbing locks in the latch letting the belt go back to plate before it reaches the stowed position on the seat, buckle, tilt the latch plate flat to move the seat rearward or unlock. recline the seat until the shoulder belt retractor lock releases. Engaging the child restraint locking feature in the front outboard seating position may affect the passenger sensing system, if equipped. See Passenger Sensing System 4. To make the lap part tight, pull 0 77. up on the shoulder belt.

3. Push the latch plate into the buckle until it clicks. Pull up on the latch plate to make sure it is secure. If the belt is not long enough, see Seat Belt Extender 0 70. Position the release button on the buckle so that the seat belt could be quickly unbuckled if necessary. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 69 To unlatch the belt, push the button activation are met. Seat belt Comfort guides are available on the buckle. The belt should pretensioners can also help tighten through your dealer for the rear return to its stowed position. the seat belts in a side crash or outboard seating positions. Always stow the seat belt slowly. rollover event. Instructions are included with the If the seat belt webbing returns Pretensioners work only once. If the comfort guides. quickly to the stowed position, the pretensioners activate in a crash, retractor may lock and cannot be the pretensioners and probably Seat Belt Use During pulled out. If this happens, pull the other parts of the vehicle's seat belt Pregnancy seat belt straight out firmly to unlock system will need to be replaced. Seat belts work for everyone, the webbing, and then release it. See Replacing Seat Belt System including pregnant women. Like all If the webbing is still locked in the Parts after a Crash 0 71. occupants, they are more likely to retractor, see your dealer. Do not sit on the outboard seat belt be seriously injured if they do not Before a door is closed, be sure the while entering or exiting the vehicle wear seat belts. seat belt is out of the way. If a door or at any time while sitting in the is slammed against a seat belt, seat. Sitting on the seat belt can damage can occur to both the seat damage the webbing and hardware. belt and the vehicle. Rear Seat Belt Comfort Guides Seat Belt Pretensioners Rear seat belt comfort guides may This vehicle has seat belt provide added seat belt comfort for pretensioners for the front outboard older children who have outgrown occupants. Although the seat belt booster seats and for some adults. pretensioners cannot be seen, they When installed on a shoulder belt, are part of the seat belt assembly. the comfort guide positions the They can help tighten the seat belts shoulder belt away from the neck during the early stages of a and head. moderate to severe frontal, near frontal, or rear crash if the threshold conditions for pretensioner GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

70 Seats and Restraints A pregnant woman should wear a information on the proper use and fit Make sure the seat belt reminder lap-shoulder belt, and the lap of seat belt extenders see the light is working. See Seat Belt portion should be worn as low as instruction sheet that comes with Reminders 0 135. possible, below the rounding, the extender. Keep seat belts clean and dry. See throughout the pregnancy. Seat Belt Care 0 70. The best way to protect the fetus is Safety System Check to protect the mother. When a seat Periodically check the seat belt Seat Belt Care belt is worn properly, it is more likely reminder, seat belts, buckles, latch Keep belts clean and dry. that the fetus will not be hurt in a plates, retractors, shoulder belt crash. For pregnant women, as for height adjusters (if equipped), and Seat belts should be properly cared anyone, the key to making seat seat belt anchorages to make sure for and maintained. belts effective is wearing them they are all in working order. Look Seat belt hardware should be kept properly. for any other loose or damaged seat dry and free of dust or debris. As belt system parts that might keep a necessary, exterior hard surfaces Seat Belt Extender seat belt system from performing and seat belt webbing may be lightly If the vehicle's seat belt will fasten properly. See your dealer to have it cleaned with mild soap and water. around you, you should use it. repaired. Torn, frayed, or twisted Ensure there is not excessive dust seat belts may not protect you in a or debris in the mechanism. If dust But if a seat belt is not long enough, crash. Torn or frayed seat belts can or debris exists in the system please your dealer will order you an rip apart under impact forces. If a see the dealer. Parts may need to extender. When you go in to order it, belt is torn or frayed, have it be replaced to ensure proper take the heaviest coat you will wear, replaced immediately. If a belt is functionality of the system. so the extender will be long enough twisted, it may be possible to for you. To help avoid personal untwist by reversing the latch plate injury, do not let someone else use on the webbing. If the twist cannot it, and use it only for the seat it is be corrected, ask your dealer to made to fit. The extender has been fix it. designed for adults. Never use it for securing child restraints. For more GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 71

{ Warning Warning (Continued) Airbag System The vehicle has the following Do not bleach or dye seat belt have them inspected and any airbags: webbing. It may severely weaken necessary replacements made as the webbing. In a crash, they soon as possible. . A frontal airbag for the driver might not be able to provide . A frontal airbag for the front adequate protection. Clean and After a minor crash, replacement of outboard passenger rinse seat belt webbing only with seat belts may not be necessary. . A seat-mounted side impact mild soap and lukewarm water. But the seat belt assemblies that airbag for the driver Allow the webbing to dry. were used during any crash may . A seat-mounted side impact have been stressed or damaged. airbag for the front outboard See your dealer to have the seat passenger Replacing Seat Belt belt assemblies inspected or System Parts after a replaced. . A roof-rail airbag for the driver Crash and the passenger seated New parts and repairs may be directly behind the driver necessary even if the seat belt { Warning system was not being used at the . A roof-rail airbag for the front time of the crash. outboard passenger and the A crash can damage the seat belt passenger seated directly Have the seat belt pretensioners system in the vehicle. A damaged behind the front outboard checked if the vehicle has been in a passenger seat belt system may not properly crash, or if the airbag readiness light protect the person using it, stays on after you start the vehicle All vehicle airbags have the word resulting in serious injury or even or while you are driving. See Airbag AIRBAG on the trim or on a label death in a crash. To help make Readiness Light 0 135. near the deployment opening. sure the seat belt systems are working properly after a crash, (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

72 Seats and Restraints For frontal airbags, the word AIRBAG is on the center of the Warning (Continued) Warning (Continued) steering wheel for the driver and on the instrument panel for the front airbags. Airbags are designed to airbag when it inflates can be outboard passenger. work with seat belts, not replace seriously injured or killed. Do not them. Also, airbags are not sit unnecessarily close to any For seat-mounted side impact designed to inflate in every crash. airbag, as you would be if sitting airbags, the word AIRBAG is on the In some crashes seat belts are on the edge of the seat or leaning side of the seatback or side of the the only restraint. See When forward. Seat belts help keep you seat closest to the door. Should an Airbag Inflate? 0 75. in position before and during a For roof-rail airbags, the word Wearing your seat belt during a crash. Always wear a seat belt, AIRBAG is on the ceiling or trim. crash helps reduce your chance even with airbags. The driver Airbags are designed to supplement of hitting things inside the vehicle should sit as far back as possible the protection provided by seat or being ejected from it. Airbags while still maintaining control of the vehicle. The seat belts and belts. Even though today's airbags are “supplemental restraints” to are also designed to help reduce the seat belts. Everyone in the the front outboard passenger the risk of injury from the force of an vehicle should wear a seat belt airbags are most effective when inflating bag, all airbags must inflate properly, whether or not there is you are sitting well back and very quickly to do their job. an airbag for that person. upright in the seat with both feet Here are the most important things on the floor. to know about the airbag system: Occupants should not lean on or sleep against the door or side { Warning { Warning windows in seating positions with Because airbags inflate with great seat-mounted side impact airbags You can be severely injured or and/or roof-rail airbags. killed in a crash if you are not force and faster than the blink of wearing your seat belt, even with an eye, anyone who is up against, or very close to, any (Continued) (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 73 Where Are the Airbags? { Warning

Children who are up against, or very close to, any airbag when it inflates can be seriously injured or killed. Always secure children properly in the vehicle. To read how, see Older Children 0 84 or Infants and Young Children 0 86.

The front outboard passenger frontal airbag is in the passenger The driver frontal airbag is in the side instrument panel. center of the steering wheel.

There is an airbag readiness light on the instrument cluster, which shows the airbag symbol. The system checks the airbag electrical system for malfunctions. The light tells you if there is an electrical problem. See Airbag Readiness Light 0 135. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

74 Seats and Restraints

Warning (Continued)

that person causing severe injury or even death. The path of an inflating airbag must be kept clear. Do not put anything between an occupant and an airbag, and do not attach or put anything on the steering wheel hub or on or near any other airbag covering. Driver Side Shown, Passenger Driver Side Crew Cab Shown, Do not use seat accessories that Side Similar Passenger Side Double and block the inflation path of a The driver and front outboard Regular Cabs Similar seat-mounted side impact airbag. passenger seat-mounted side The roof-rail airbags for the driver, Never secure anything to the roof impact airbags are in the side of the front outboard passenger, and of a vehicle with roof-rail airbags seatbacks closest to the door. second row outboard passengers by routing a rope or tie‐down are in the ceiling above the side through any door or window windows. opening. If you do, the path of an inflating roof-rail airbag will be { Warning blocked. If something is between an occupant and an airbag, the airbag might not inflate properly or it might force the object into (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 75 When Should an Airbag It depends on what is hit, the A seat-mounted side impact airbag direction of the impact, and how is designed to inflate on the side of Inflate? quickly the vehicle slows down. the vehicle that is struck. This vehicle is equipped with 0 Frontal airbags may inflate at Roof-rail airbags are designed to airbags. See Airbag System 71. different crash speeds depending on inflate in moderate to severe side Airbags are designed to inflate if the whether the vehicle hits an object crashes depending on the location impact exceeds the specific airbag straight on or at an angle, and of the impact. In addition, these system's deployment threshold. whether the object is fixed or roof-rail airbags are designed to Deployment thresholds are used to moving, rigid or deformable, narrow inflate during a rollover or in a predict how severe a crash is likely or wide. severe frontal impact. Roof-rail to be in time for the airbags to Frontal airbags are not intended to airbags are not designed to inflate in inflate and help restrain the rear impacts. Both roof-rail airbags occupants. The vehicle has inflate during vehicle rollovers, rear impacts, or many side impacts. will inflate when either side of the electronic sensors that help the vehicle is struck or if the sensing airbag system determine the In addition, the vehicle has system predicts that the vehicle is severity of the impact. Deployment advanced technology frontal about to roll over on its side, or in a thresholds can vary with specific airbags. Advanced technology severe frontal impact. vehicle design. frontal airbags adjust the restraint according to crash severity. In any particular crash, no one can Frontal airbags are designed to say whether an airbag should have inflate in moderate to severe frontal Seat-mounted side impact airbags inflated simply because of the or near frontal crashes to help are designed to inflate in moderate vehicle damage or repair costs. reduce the potential for severe to severe side crashes depending injuries, mainly to the driver's or on the location of the impact. What Makes an Airbag front outboard passenger's head Seat-mounted side impact airbags and chest. are not designed to inflate in frontal Inflate? Whether the frontal airbags will or impacts, near frontal impacts, In a deployment event, the sensing should inflate is not based primarily rollovers, or rear impacts. system sends an electrical signal on how fast the vehicle is traveling. triggering a release of gas from the inflator. Gas from the inflator fills the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

76 Seats and Restraints airbag causing the bag to break out full or partial ejection in rollover be some smoke and dust coming of the cover. The inflator, the airbag, events, although no system can from the vents in the deflated and related hardware are all part of prevent all such ejections. airbags. Airbag inflation does not the airbag module. But airbags would not help in many prevent the driver from seeing out of For airbag locations, see Where Are types of collisions, primarily the windshield or being able to steer the Airbags? 0 73. because the occupant's motion is the vehicle, nor does it prevent not toward those airbags. See When people from leaving the vehicle. How Does an Airbag Should an Airbag Inflate? 0 75. { Warning Restrain? Airbags should never be regarded as anything more than a supplement In moderate to severe frontal or When an airbag inflates, there to seat belts. near frontal collisions, even belted may be dust in the air. This dust occupants can contact the steering could cause breathing problems wheel or the instrument panel. In What Will You See after for people with a history of moderate to severe side collisions, an Airbag Inflates? asthma or other breathing trouble. To avoid this, everyone in the even belted occupants can contact After frontal and seat-mounted side the inside of the vehicle. impact airbags inflate, they quickly vehicle should get out as soon as Airbags supplement the protection deflate, so quickly that some people it is safe to do so. If you have provided by seat belts by may not even realize the airbags breathing problems but cannot distributing the force of the impact inflated. Roof-rail airbags may still get out of the vehicle after an more evenly over the be at least partially inflated for some airbag inflates, then get fresh air occupant's body. time after they inflate. Some by opening a window or a door. If you experience breathing Rollover capable roof-rail airbags components of the airbag module problems following an airbag are designed to help contain the may be hot for several minutes. For location of the airbags, see Where deployment, you should seek head and chest of occupants in the 0 outboard seating positions in the Are the Airbags? 73. medical attention. first and second rows. The rollover The parts of the airbag that come capable roof-rail airbags are into contact with you may be warm, designed to help reduce the risk of but not too hot to touch. There may GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 77 The vehicle has a feature that may . The vehicle has a crash sensing automatically unlock the doors, turn Warning (Continued) and diagnostic module which on the interior lamps and hazard records information after a warning flashers, and shut off the moderate crash, there may be crash. See Vehicle Data fuel system after the airbags inflate. concealed damage that could Recording and Privacy 0 473 The feature may also activate, make it difficult to safely operate and without airbag inflation, after an the vehicle. Event Data Recorders 0 474. event that exceeds a predetermined Use caution if you should attempt . Let only qualified technicians threshold. After turning the ignition to restart the engine after a crash work on the airbag systems. off and then on again, the fuel has occurred. Improper service can mean that system will return to normal an airbag system will not work operation; the doors can be locked, In many crashes severe enough to properly. See your dealer for the interior lamps can be turned off, service. and the hazard warning flashers can inflate the airbag, are be turned off using the controls for broken by vehicle deformation. those features. If any of these Additional windshield breakage may Passenger Sensing systems are damaged in the crash also occur from the front outboard System passenger airbag. they may not operate as normal. The vehicle has a passenger . Airbags are designed to inflate sensing system for the front { Warning only once. After an airbag outboard passenger position. The inflates, you will need some new passenger airbag status indicator A crash severe enough to inflate parts for the airbag system. will light on the overhead console the airbags may have also If you do not get them, the when the vehicle is started. damaged important functions in airbag system will not be there the vehicle, such as the fuel to help protect you in another system, brake and steering crash. A new system will include systems, etc. Even if the vehicle airbag modules and possibly appears to be drivable after a other parts. The service manual for the vehicle covers the need (Continued) to replace other parts. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

78 Seats and Restraints The passenger sensing system works with sensors that are part of Warning (Continued) the front outboard passenger seat and seat belt. The sensors are airbag inflates. This is because designed to detect the presence of the back of the rear-facing child a properly seated occupant and restraint would be very close to the inflating airbag. A child in a United States determine if the front outboard passenger frontal airbag should be forward-facing child restraint can allowed to inflate or not. be seriously injured or killed if the passenger frontal airbag inflates According to accident statistics, and the passenger seat is in a children are safer when properly secured in a rear seat in the correct forward position. child restraint for their weight Even if the passenger sensing and size. system has turned off the Canada Whenever possible, children aged passenger frontal airbag, no The words ON and OFF, or the 12 and under should be secured in system is fail-safe. No one can symbols for on and off, will be a rear seating position. guarantee that an airbag will not visible during the system check. deploy under some unusual Never put a rear-facing child seat in When the system check is circumstance, even though the complete, either the word ON or the front. This is because the risk to the rear-facing child is so great, airbag is turned off. OFF, or the symbol for on or off, will be visible. See Passenger Airbag if the airbag inflates. Never put a rear-facing child Status Indicator 0 136. restraint in the front seat, even if { Warning the airbag is off. If securing a The passenger sensing system forward-facing child restraint in turns off the front outboard A child in a rear-facing child the front outboard passenger passenger frontal airbag under restraint can be seriously injured seat, always move the seat as far certain conditions. No other airbag or killed if the passenger frontal back as it will go. It is better to is affected by the passenger sensing system. (Continued) (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 79 When the passenger sensing wear a seat belt properly — whether Warning (Continued) system has turned off the front or not there is an airbag for that outboard passenger frontal airbag, person. secure child restraints in the rear the OFF indicator will light and stay seat. Consider using another lit as a reminder that the airbag is { Warning vehicle to transport the child off. See Passenger Airbag Status when a rear seat is not available. Indicator 0 136. If the airbag readiness light ever The passenger sensing system is comes on and stays on, it means If the vehicle does not have a rear designed to turn on the front that something may be wrong seat that will accommodate a outboard passenger frontal airbag with the airbag system. To help rear-facing child restraint, a anytime the system senses that a avoid injury to yourself or others, rear-facing child restraint should not person of adult size is sitting have the vehicle serviced right be installed in the vehicle, even if properly in the front outboard away. See Airbag Readiness the airbag is off. passenger seat. Light 0 135 for more information, The passenger sensing system is When the passenger sensing including important safety designed to turn off the front system has allowed the airbag to be information. outboard passenger frontal airbag if: enabled, the ON indicator will light . The front outboard passenger and stay lit as a reminder that the If the On Indicator Is Lit for a seat is unoccupied. airbag is active. Child Restraint . The system determines an infant For some children, including The passenger sensing system is is present in a child restraint. children in child restraints, and for designed to turn off the front very small adults, the passenger . A front outboard passenger outboard passenger frontal airbag if sensing system may or may not turn the system determines that an infant takes his/her weight off of the off the front outboard passenger seat for a period of time. is present in a child restraint. If a frontal airbag, depending upon the child restraint has been installed . There is a critical problem with person's seating posture and body and the ON indicator is lit: the airbag system or the build. Everyone in the vehicle who passenger sensing system. has outgrown child restraints should 1. Turn the vehicle off. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

80 Seats and Restraints 2. Remove the child restraint from 5. If, after reinstalling the child If the Off Indicator Is Lit for an the vehicle. restraint and restarting the Adult-Sized Occupant 3. Remove any additional items vehicle, the ON indicator is still from the seat such as blankets, lit, turn the vehicle off. Then cushions, seat covers, seat slightly recline the vehicle heaters, or seat massagers. seatback and adjust the seat cushion, if adjustable, to make 4. Reinstall the child restraint sure that the vehicle seatback following the directions is not pushing the child provided by the child restraint restraint into the seat cushion. manufacturer and refer to Securing Child Restraints (In Also make sure the child the Center Front Seat) 0 107 or restraint is not trapped under Securing Child Restraints (With the vehicle head restraint. the Seat Belt in the Rear Seat) If this happens, adjust the head 0 restraint. See Head Restraints 104 or 0 Securing Child Restraints (With 53. If a person of adult size is sitting in the Seat Belt in the Front 6. Restart the vehicle. the front outboard passenger seat, 0 but the OFF indicator is lit, it could Outboard Seat) 108. The passenger sensing system may be because that person is not sitting Make sure the seat belt or may not turn off the airbag for a properly in the seat or that the child retractor is locked by pulling child in a child restraint depending restraint locking feature is engaged. the shoulder belt all the way upon the child s size. It is better to ’ Use the following steps to allow the out of the retractor when secure child restraints in the rear system to detect that person and installing the child restraint, seat. Consider using another enable the front outboard passenger even if the child restraint is vehicle to transport the child when a frontal airbag: equipped with a seat belt lock rear seat is not available. Never put off. When the retractor lock is a rear-facing child restraint in the 1. Turn the vehicle off. set, the belt can be tightened front seat, even if the ON indicator but not pulled out of the is not lit. retractor. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 81 2. Remove any additional material A thick layer of additional material, from the seat, such as { Warning such as a blanket or cushion, blankets, cushions, seat or aftermarket equipment such as covers, seat heaters, or seat If the front outboard passenger seat covers, seat heaters, and seat massagers. airbag is turned off for an massagers can affect how well the adult-sized occupant, the airbag passenger sensing system 3. Place the seatback in the fully will not be able to inflate and help upright position. operates. We recommend that you protect that person in a crash, not use seat covers or other 4. Have the person sit upright in resulting in an increased risk of aftermarket equipment except when the seat, centered on the seat serious injury or even death. An approved by GM for your specific cushion, with legs comfortably adult-sized occupant should not vehicle. See Adding Equipment to extended. ride in the front outboard the Airbag-Equipped Vehicle 0 82 5. If the shoulder portion of the passenger seat, if the passenger for more information about belt is pulled out all the way, airbag OFF indicator is lit. modifications that can affect how the child restraint locking the system operates. feature will be engaged. This Additional Factors Affecting The ON indicator may be lit if an may unintentionally cause the System Operation object, such as a briefcase, passenger sensing system to handbag, grocery bag, laptop, turn the airbag off for some Seat belts help keep the passenger or other electronic device, is put on adult-sized occupants. If this in position on the seat during an unoccupied seat. If this is not happens, unbuckle the belt, let vehicle maneuvers and braking, desired, remove the object from the belt go back all the way, which helps the passenger sensing the seat. and then buckle the belt again system maintain the passenger without pulling the belt out all airbag status. See “Seat Belts” and { Warning the way. “Child Restraints” in the Index for additional information about the 6. Restart the vehicle and have Stowing articles under the importance of proper restraint use. the person remain in this passenger seat or between the position for two to three minutes passenger seat cushion and after the ON indicator is lit. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

82 Seats and Restraints . Front seats, including stitching, Warning (Continued) Warning (Continued) seams, or zippers seatback may interfere with the are close to an airbag when it . Seat belts proper operation of the passenger inflates. Avoid yellow connectors. . Steering wheel, instrument sensing system. They are probably part of the panel, overhead console, ceiling airbag system. Be sure to follow trim, or garnish trim proper service procedures, and Servicing the . Inner door seals, including make sure the person performing speakers Airbag-Equipped Vehicle work for you is qualified to do so. Your dealer and the service manual Airbags affect how the vehicle have information about the location should be serviced. There are parts Adding Equipment to the of the airbag modules and sensors, of the airbag system in several Airbag-Equipped Vehicle sensing and diagnostic module, and places around the vehicle. Your airbag wiring along with the proper dealer and the service manual have Adding accessories that change the replacement procedures. information about servicing the vehicle's frame, bumper system, vehicle and the airbag system. To height, front end, or side sheet In addition, the vehicle has a purchase a service manual, see metal, may keep the airbag system passenger sensing system for the Publication Ordering Information from working properly. front outboard passenger position, 0 471. which includes sensors that are part The operation of the airbag system of the passenger seat. The can also be affected by changing, { Warning passenger sensing system may not including improperly repairing or operate properly if the original seat replacing, any parts of the following: For up to 10 seconds after the trim is replaced with non-GM vehicle is turned off and the . Airbag system, including airbag covers, upholstery, or trim; or with battery is disconnected, an airbag modules, front or side impact GM covers, upholstery, or trim can still inflate during improper sensors, sensing and diagnostic designed for a different vehicle. Any service. You can be injured if you module, or airbag wiring object, such as an aftermarket seat heater or a comfort-enhancing pad (Continued) or device, installed under or on top GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 83 of the seat fabric, could also If the vehicle must be modified interfere with the operation of the because you have a disability and Caution (Continued) passenger sensing system. This have questions about whether the could either prevent proper modifications will affect the vehicle's covering and/or airbag module deployment of the passenger airbag system, or if you have replaced. For the location of the airbag(s) or prevent the passenger questions about whether the airbag airbags, see Where Are the sensing system from properly system will be affected if the vehicle Airbags? 0 73. See your dealer turning off the passenger airbag(s). is modified for any other reason, call for service. See Passenger Sensing System Customer Assistance. See 0 0 77. Customer Assistance Offices 464. Replacing Airbag System If the vehicle has rollover roof-rail Parts after a Crash airbags, see Different Size Airbag System Check and Wheels 0 401 for additional The airbag system does not need important information. regularly scheduled maintenance or { Warning If a snow plow is added to the replacement. Make sure the airbag A crash can damage the airbag vehicle, the airbags should still work readiness light is working. See systems in the vehicle. Airbag Readiness Light 0 135. properly. The airbag systems were A damaged airbag system may designed to work properly under a not properly protect you and your wide range of conditions, including Caution passenger(s) in a crash, resulting snow plowing with vehicles that in serious injury or even death. To have the optional snow plow prep If an airbag covering is damaged, help make sure the airbag package (RPO VYU). Do not opened, or broken, the airbag systems are working properly change or defeat the snow plow's may not work properly. Do not after a crash, have them “tripping mechanism.” If you do, it open or break the airbag inspected and any necessary can damage the snow plow and the coverings. If there are any replacements made as soon as vehicle, and may cause an airbag opened or broken airbag possible. deployment. coverings, have the airbag (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

84 Seats and Restraints If an airbag inflates, you will need to Child Restraints . Sit all the way back on the seat. replace airbag system parts. See Do the knees bend at the seat your dealer for service. Older Children edge? If yes, continue. If no, If the airbag readiness light stays on return to the booster seat. after the vehicle is started or comes . Buckle the lap-shoulder belt. on when you are driving, the airbag Does the shoulder belt rest on system may not work properly. Have the shoulder? If yes, continue. the vehicle serviced right away. See If no, try using the rear seat belt Airbag Readiness Light 0 135. comfort guide, if available. See “Rear Seat Belt Comfort Guides” under Lap-Shoulder Belt 0 67. If a comfort guide is not available, or if the shoulder belt still does not rest on the shoulder, then return to the booster seat. . Does the lap belt fit low and Older children who have outgrown snug on the hips, touching the booster seats should wear the thighs? If yes, continue. If no, vehicle s seat belts. ’ return to the booster seat. The manufacturer instructions that . Can proper seat belt fit be come with the booster seat state the maintained for the length of the weight and height limitations for that trip? If yes, continue. If no, booster. Use a booster seat with a return to the booster seat. lap-shoulder belt until the child passes the fit test below: GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 85 Q: What is the proper way to wear seat belts? { Warning { Warning A: An older child should wear a Never allow more than one child Never allow a child to wear the lap-shoulder belt and get the to wear the same seat belt. The seat belt with the shoulder belt additional restraint a shoulder seat belt cannot properly spread behind their back. A child can be belt can provide. The shoulder the impact forces. In a crash, they seriously injured by not wearing belt should not cross the face or can be crushed together and the lap-shoulder belt properly. In a neck. The lap belt should fit seriously injured. A seat belt must crash, the child would not be snugly below the hips, just be used by only one person at restrained by the shoulder belt. touching the top of the thighs. a time. The child could move too far This applies belt force to the child's pelvic bones in a crash. forward increasing the chance of It should never be worn over the head and neck injury. The child abdomen, which could cause might also slide under the lap severe or even fatal internal belt. The belt force would then be injuries in a crash. applied right on the abdomen. That could cause serious or fatal Also see “Rear Seat Belt Comfort injuries. The shoulder belt should Guides under Lap-Shoulder Belt ” go over the shoulder and across 0 67. the chest. According to accident statistics, children are safer when properly restrained in a rear seating position. In a crash, children who are not buckled up can strike other people who are buckled up, or can be thrown out of the vehicle. Older children need to use seat belts properly. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

86 Seats and Restraints appropriate child restraints. Neither { Warning the vehicle's seat belt system nor its airbag system is designed for them. Children can be seriously injured or strangled if a shoulder belt is Children who are not restrained wrapped around their neck. The properly can strike other people, shoulder belt can tighten but or can be thrown out of the vehicle. cannot be loosened if it is locked. The shoulder belt locks when it is { Warning pulled all the way out of the retractor. It unlocks when the Never hold an infant or a child shoulder belt is allowed to go all while riding in a vehicle. Due to the way back into the retractor, crash forces, an infant or a child Infants and Young but it cannot do this if it is will become so heavy it is not possible to hold it during a crash. Children wrapped around a child’s neck. If the shoulder belt is locked and For example, in a crash at only Everyone in a vehicle needs 40 km/h (25 mph), a 5.5 kg (12 lb) tightened around a child’s neck, protection! This includes infants and the only way to loosen the belt is infant will suddenly become a all other children. Neither the to cut it. 110 kg (240 lb) force on a person's distance traveled nor the age and arms. An infant or child should be size of the traveler changes the Never leave children unattended secured in an appropriate child need, for everyone, to use safety in a vehicle and never allow restraint. restraints. In fact, the law in every children to play with the seat state in the United States and in belts. every Canadian province says children up to some age must be restrained while in a vehicle. Every time infants and young children ride in vehicles, they should have the protection provided by GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 87 For each type of child restraint, there are many different models available. When purchasing a child restraint, be sure it is designed to be used in a . If it is, the child restraint will have a label saying that it meets federal motor vehicle safety standards. The instruction manual that is provided with the child restraint states the weight and height limitations for that particular child Child restraints are devices used to restraint. In addition, there are many { Warning restrain, seat, or position children in kinds of child restraints available for children with special needs. Children who are up against, the vehicle and are sometimes or very close to, any airbag when called child seats or car seats. it inflates can be seriously injured There are three basic types of { Warning or killed. Never put a rear-facing child restraints: To reduce the risk of neck and child restraint in the front . Forward-facing child restraints head injury in a crash, infants and outboard seat. Secure a . Rear-facing child restraints toddlers should be secured in a rear-facing child restraint in a rear rear-facing child restraint until age seat. It is also better to secure a . Belt-positioning booster seats two, or until they reach the forward-facing child restraint in a The proper child restraint for your maximum height and weight limits rear seat. If you must secure a child depends on their size, weight, of their child restraint. forward-facing child restraint in and age, and also on whether the the front outboard seat, always child restraint is compatible with the move the front passenger seat as vehicle in which it will be used. far back as it will go. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

88 Seats and Restraints Child Restraint Systems { Warning

A young child's hip bones are still so small that the vehicle seat belt may not remain low on the hip bones, as it should. Instead, it may settle up around the child's abdomen. In a crash, the belt would apply force on a body area that is unprotected by any bony structure. This alone could cause serious or fatal injuries. To reduce Forward-Facing Child Restraint the risk of serious or fatal injuries during a crash, young children Rear-Facing Infant Restraint A forward-facing child restraint should always be secured in an provides restraint for the child's A rear-facing child restraint provides body with the harness. appropriate child restraint. restraint with the seating surface against the back of the infant. The harness system holds the infant in place and, in a crash, acts to keep the infant positioned in the restraint. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 89 Securing an Add-On Child When securing an add-on child Restraint in the Vehicle restraint, refer to the following: 1. Instruction labels provided on { Warning the child restraint

A child can be seriously injured or 2. Instruction manual provided with the child restraint killed in a crash if the child restraint is not properly secured in 3. This vehicle owner's manual the vehicle. Secure the child The child restraint instructions are restraint properly in the vehicle important, so if they are not using the vehicle seat belt or available, obtain a replacement LATCH system, following the copy from the manufacturer. Booster Seats instructions that came with that Keep in mind that an unsecured A belt-positioning booster seat is child restraint and the instructions child restraint can move around in a used for children who have in this manual. collision or sudden stop and injure outgrown their forward-facing child people in the vehicle. Be sure to restraint. Boosters are designed to To help reduce the chance of injury, properly secure any child restraint in improve the fit of the vehicle's seat the child restraint must be secured the vehicle — even when no child is belt system until the child is large in the vehicle. Child restraints must in it. enough for the vehicle seat belts to be secured in vehicle seats by lap fit properly without a booster seat. In some areas Certified Child belts or the lap belt portion of a Passenger Safety Technicians See the seat belt fit test in Older lap-shoulder belt, or by the LATCH Children 0 84. (CPSTs) are available to inspect system. See Lower Anchors and and demonstrate how to correctly Tethers for Children (LATCH use and install child restraints. In 0 System) 91 for more information. the U.S., refer to the National Children can be endangered in a Highway Traffic Safety crash if the child restraint is not Administration (NHTSA) website to properly secured in the vehicle. locate the nearest child safety seat GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

90 Seats and Restraints inspection station. For CPST Never put a rear-facing child availability in Canada, check with restraint in the front. This is because Warning (Continued) Transport Canada or the Provincial the risk to the rear-facing child is so Ministry of Transportation office. great if the airbag deploys. Secure rear-facing child restraints in a rear seat, even if the airbag Securing the Child Within the is off. If you secure a { Warning Child Restraint forward-facing child restraint in A child in a rear-facing child the front seat, always move the { Warning restraint can be seriously injured front passenger seat as far back or killed if the front passenger as it will go. It is better to secure A child can be seriously injured or airbag inflates. This is because the child restraint in a rear seat. killed in a crash if the child is not the back of the rear-facing child See Passenger Sensing System properly secured in the child restraint would be very close to 0 77 for additional information. restraint. Secure the child the inflating airbag. A child in a properly following the instructions forward-facing child restraint can that came with that child restraint. be seriously injured or killed if the front passenger airbag inflates { Warning and the passenger seat is in a Where to Put the A child in a child restraint in the forward position. Restraint center front seat can be badly Even if the passenger sensing injured or killed by the frontal According to accident statistics, system has turned off the front airbags if they inflate. Never children and infants are safer when passenger frontal airbag, no properly restrained in an appropriate secure a child restraint in the child restraint secured in a rear system is fail-safe. No one can center front seat. It is always seating position. guarantee that an airbag will not better to secure a child restraint in deploy under some unusual a rear seat. Whenever possible, children aged circumstance, even though it is 12 and under should be secured in turned off. a rear seating position. Do not use child restraints in the (Continued) center front seat position. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 91 If the vehicle does not have a rear Wherever a child restraint is In order to use the LATCH system in seat that will accommodate a installed, be sure to follow the your vehicle, you need a child rear-facing child restraint, a instructions that came with the child restraint that has LATCH rear-facing child restraint should not restraint and secure the child attachments. LATCH-compatible be installed in the vehicle, even if restraint properly. rear-facing and forward-facing child the airbag is off. Keep in mind that an unsecured seats can be properly installed When securing a child restraint with child restraint can move around in a using either the LATCH anchors or the seat belts in a rear seat position, collision or sudden stop and injure the vehicle’s seat belts. Do not use study the instructions that came with people in the vehicle. Be sure to both the seat belts and the LATCH the child restraint to make sure it is properly secure any child restraint in anchorage system to secure a rear-facing or forward-facing compatible with this vehicle. the vehicle — even when no child is child seat. Child restraints and booster seats in it. vary considerably in size, and some Booster seats use the vehicle’s seat may fit in certain seating positions Lower Anchors and belts to secure the child and the better than others. Tethers for Children booster seat. If the manufacturer recommends that the booster seat Depending on where you place the (LATCH System) be secured with the LATCH system, child restraint and the size of the The LATCH system secures a child this can be done as long as the child restraint, you may not be able restraint during driving or in a crash. booster seat can be positioned to access adjacent seat belts or LATCH attachments on the child properly and there is no interference LATCH anchors for additional restraint are used to attach the child with the proper positioning of the passengers or child restraints. restraint to the anchors in the lap-shoulder belt on the child. Adjacent seating positions should vehicle. This system is designed to not be used if the child restraint Make sure to follow the instructions make installation of a child restraint that came with the child restraint, prevents access to or interferes with easier. the routing of the seat belt. and also the instructions in this manual. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

92 Seats and Restraints When installing a child restraint with a top tether, you must also use either the lower anchors or the seat belts to properly secure the child restraint. A child restraint must never be installed using only the top tether. For a forward-facing 5-pt harness child restraint where the combined weight of the child and restraint are up to 29.5 kg (65 lb), use either the lower LATCH anchorages with the top tether anchorage, or the seat belt with the top tether anchorage. Where the combined weight of the child and restraint are greater than 29.5 kg (65 lb), use the seat belt with the top tether anchorage only. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 93 Recommended Methods for Attaching Child Restraints Restraint Type Combined Use Only Approved Attachment Methods Shown with an X Weight of the LATCH Lower Seat Belt Only LATCH Lower Seat Belt and Child + Child – – Anchors Only Anchors and Top Top Tether Restraint Tether Anchor Anchor Rear-Facing Up to XX Child Restraint 29.5 kg (65 lb) Rear-Facing Greater than X Child Restraint 29.5 kg (65 lb) Forward-Facing Up to XX Child Restraint 29.5 kg (65 lb) Forward-Facing Greater than X Child Restraint 29.5 kg (65 lb)

See Securing Child Restraints (In Child restraints built after March tether where available) to secure the Center Front Seat) 0 107 or 2014 will be labeled with the the child restraint. See Securing Securing Child Restraints (With the specific child weight up to which the Child Restraints (In the Center Front Seat Belt in the Rear Seat) 0 104 or LATCH system can be used to Seat) 0 107 or Securing Child Restraints (With the install the restraint. Securing Child Restraints (With the Seat Belt in the Front Outboard Seat Belt in the Rear Seat) 0 104 or 0 The following explains how to attach Seat) 108. a child restraint with these Securing Child Restraints (With the attachments in the vehicle. Seat Belt in the Front Outboard Seat) 0 108. Not all vehicle seating positions have lower anchors. In this case, the seat belt must be used (with top GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

94 Seats and Restraints Lower Anchors Top Tether Anchor Some child restraints that have a top tether are designed for use with or without the top tether being attached. Others require the top tether always to be attached. In Canada, the law requires that forward-facing child restraints have a top tether, and that the tether be attached. Be sure to read and follow the instructions for your child restraint. Lower Anchor and Top Tether Anchor Locations

Lower anchors (1) are metal bars A top tether (3, 4) is used to secure built into the vehicle. There are two the top of the child restraint to the lower anchors for each LATCH vehicle. A top tether anchor is built seating position that will into the vehicle. The top tether accommodate a child restraint with attachment hook (2) on the child lower attachments (2). restraint connects to the top tether anchor in the vehicle in order to reduce the forward movement and rotation of the child restraint during driving or in a crash. The child restraint may have a single tether (3) or a dual tether (4). Regular Cab — Only Either will have a single attachment hook (2) to secure the top tether to the anchor. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 95 lower anchors has two labels near the crease between the seatback and the seat cushion.

For regular cab models, there are top tether anchor symbols to assist Regular Cab — Three-Passenger Double and Crew Cab Rear Seat you in locating the top tether Front Seat I : Seating positions with top anchors. I : Seating positions with tether anchors. Do not install a child restraint in the top tether anchors. H : Seating positions with two center seating position. See Securing Child Restraints (In the Do not install a child restraint in the lower anchors. Center Front Seat) 0 107 or center front seating position. See Securing Child Restraints (With the Securing Child Restraints (In the Seat Belt in the Rear Seat) 0 104 or Center Front Seat) 0 107 or Securing Child Restraints (With the Securing Child Restraints (With the Seat Belt in the Front Outboard Seat Belt in the Rear Seat) 0 104 or Seat) 0 108 for more information. Securing Child Restraints (With the Seat Belt in the Front Outboard 0 Seat) 108 for more information. To assist in locating the lower anchors on double and crew cab models, each seating position with GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

96 Seats and Restraints

Regular Cab Driver Side Anchor and Loop Center Anchor and Loop (Double For regular cab models, the top (Double and Crew Cab) and Crew Cab) tether anchors are on the back panel behind the passenger seat(s) or center seat. Be sure to use an anchor directly behind the seating position where the child restraint will be placed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 97 that the top tether be attached, or if the instructions that come with the { Warning child restraint say that the top tether must be attached. Do not attach more than one child restraint to a single anchor, According to accident statistics, except for the center top tether children and infants are safer when anchors in the crew cab models. properly restrained in a child Attaching more than one child restraint system or infant restraint restraint to a single anchor could system secured in a rear seating cause the anchor or attachment position. See Where to Put the to come loose or even break Restraint 0 90 for additional information. during a crash. A child or others Passenger Side Loop (Double and could be injured. To reduce the Crew Cab) Securing a Child Restraint risk of serious or fatal injuries Designed for the LATCH during a crash, attach only one For double and crew cab models, System child restraint per anchor. the top tether is routed through loops (2) to the top tether anchors (1). Be sure to use the { Warning correct anchor for the seating A child could be seriously injured { Warning position where the child restraint will be placed. or killed in a crash if the child Children can be seriously injured restraint is not properly attached or strangled if a shoulder belt is Be sure to read the following to the vehicle using either the wrapped around their neck. The instructions to properly install a child LATCH anchors or the vehicle restraint using these loops and shoulder belt can tighten but seat belt. Follow the instructions cannot be loosened if it is locked. anchors. that came with the child restraint Do not secure a child restraint in a and the instructions in this (Continued) position without a top tether anchor manual. if a national or local law requires GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

98 Seats and Restraints belts and a top tether. See Warning (Continued) Caution Securing Child Restraints (In the Center Front Seat) 0 107 or The shoulder belt locks when it is Do not let the LATCH Securing Child Restraints (With pulled all the way out of the attachments rub against the the Seat Belt in the Rear Seat) retractor. It unlocks when the vehicle’s seat belts. This may 0 104 or shoulder belt is allowed to go all damage these parts. If necessary, Securing Child Restraints (With the way back into the retractor, move buckled seat belts to avoid the Seat Belt in the Front but it cannot do this if it is rubbing the LATCH attachments. Outboard Seat) 0 108. wrapped around a child’s neck. Do not fold the rear seat cushion If the child restraint If the shoulder belt is locked and when the seat is occupied. Do not manufacturer recommends that tightened around a child’s neck, fold the empty rear seat with a the top tether be attached, the only way to loosen the belt is seat belt buckled. This could attach and tighten the top to cut it. damage the seat belt or the seat. tether to the top tether anchor, if your vehicle has one. Refer Buckle any unused seat belts Unbuckle and return the seat belt to the child restraint behind the child restraint so to its stowed position, before folding the seat. instructions and the following children cannot reach them. Pull steps: the shoulder belt all the way out of the retractor to set the lock, If you need to secure more than one 1.1. Find the top tether and tighten the belt behind the child restraint in the rear seat, see anchor. child restraint after the child Where to Put the Restraint 0 90. 1.2. Route, attach, and tighten restraint has been installed. the top tether according Regular Cab Models to your child restraint 1. For models without a rear seat, instructions and the forward-facing child restraints following instructions: should only be installed in the right front seating position with GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 99 and route the tether Double and Crew Cab Models under the head restraint 1. Attach and tighten the lower and in between the head attachments to the lower restraint posts. anchors. If the child restraint 2. Make sure the child restraint does not have lower top tether hook is completely attachments or the desired closed and secured to the top seating position does not have tether anchor. lower anchors, secure the child 3. Secure the child restraint in the restraint with the top tether and If the position you are the seat belt. Refer to the child using has an adjustable right front seating position with the vehicle belts. See Securing restraint manufacturer head restraint and you instructions and the are using a dual tether, Child Restraints (In the Center 0 instructions in this manual. route the tether around Front Seat) 107 or the head restraint. Securing Child Restraints (With 1.1. Find the lower anchors the Seat Belt in the Rear Seat) for the desired seating 0 104 or position. Securing Child Restraints (With 1.2. Put the child restraint on the Seat Belt in the Front the seat. Outboard Seat) 0 108. 1.3. Attach and tighten the 4. Before placing a child in the lower attachments on the child restraint, make sure it is child restraint to the lower securely held in place. To anchors. check, grasp the child restraint at the belt path and attempt to 2. For forward-facing child If the position you are move it side to side and back restraints, attach and tighten using has an adjustable and forth. There should be no the top tether to the top tether head restraint and you more than 2.5 cm (1 in) of anchor, if your vehicle has one. are using a single tether, movement for proper Follow the child restraint raise the head restraint installation. instructions and the vehicle GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

100 Seats and Restraints LATCH anchor weight limits described at the beginning of this section, and the following steps:

Rear Driver Side Position 2.1.2. For first time use, 2.1. For a top tether in the remove and rear driver side position: discard the rubber band from the top 2.1.1. Remove the driver Rear Driver Side Position tether loop (2). side head restraint and center 2.1.3. Route the top headrest. See tether (3) through “Head Restraint or the loop (2). Headrest Removal 2.1.4. Attach the top and Reinstallation” tether (3) to the later in this driver side of the section. center top tether metal anchor (1). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 101 2.1.5. Make sure the 2.2.2. Route the top child restraint top tether (3) through tether hook is the loop (2). completely closed 2.2.3. Attach the top and secured to the tether (3) to the top tether anchor. passenger side of the center top tether metal anchor (1). 2.2.4. Make sure the child restraint top tether hook is Rear Passenger Side Position completely closed 2.2. For a top tether in the and secured to the rear passenger side top tether anchor. position: 2.2.1. Remove the passenger side Rear Passenger Side Position head restraint and center headrest. See “Head Restraint or Headrest Removal and Reinstallation” later in this section. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

102 Seats and Restraints 2.3. For a top tether in the 3. Tighten the top tether per the rear center position: child restraint manufacturer's 2.3.1. Remove the driver instructions. side head restraint When the top tether is properly and center tightened, the loop may bend. headrest. See This is normal and will not “Head Restraint or damage the vehicle. Headrest Removal If child restraints are installed and Reinstallation” in both outboard positions, both later in this top tethers can be attached to section. the center anchor. Top tethers 2.3.2. Route the top can be attached for child Rear Center Position tether (1) through restraints in all three rear the center loop (2). seating positions at the same 2.3.3. Attach the top time, following the routing tether (1) to the instructions above. driver side top 4. Before placing a child in the tether metal child restraint, make sure it is anchor (3). securely held in place. To 2.3.4. Make sure the check, grasp the child restraint child restraint top at the LATCH path and attempt tether hook is to move it side to side and completely closed back and forth. There should and secured to the be no more than 2.5 cm (1 in) top tether anchor. of movement for proper Rear Center Position installation. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 103 Head Restraint or Headrest 2. Store the head restraint or To reinstall the head restraint or Removal and Reinstallation headrest in a secure place. headrest: The second row outboard head 3. When the child restraint is restraints or center headrest can be removed, reinstall the head removed if they interfere with the restraint or headrest before the proper installation of the child seating position is used. restraint. To remove the second row head { Warning restraints or center headrest: With head restraints that are not installed and adjusted properly, there is a greater chance that occupants will suffer a neck/ spinal injury in a crash. Do not drive until the head restraints for all occupants are installed and 1. Insert the head restraint or adjusted properly. headrest posts into the holes in the top of the seatback. The notches on the posts must face the driver side of the vehicle. 2. Push the head restraint or headrest down. 1. Press both buttons on the head 3. Try to move the head restraint restraint or headrest posts at or headrest to make sure that it the same time, and pull up on is locked in place. the head restraint or headrest. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

104 Seats and Restraints Replacing LATCH System Securing Child Restraints In Canada, the law requires that forward-facing child restraints have Parts After a Crash (With the Seat Belt in the a top tether, and that the tether be Rear Seat) attached. { Warning When securing a child restraint with If the child restraint or vehicle seat A crash can damage the LATCH the seat belts in a rear seat position, position does not have the LATCH system in the vehicle. A damaged study the instructions that came with system, you will be using the seat LATCH system may not properly the child restraint to make sure it is belt to secure the child restraint. Be compatible with this vehicle. sure to follow the instructions that secure the child restraint, came with the child restraint. resulting in serious injury or even If the child restraint has the LATCH death in a crash. To help make system, see Lower Anchors and If more than one child restraint sure the LATCH system is Tethers for Children (LATCH needs to be installed in the rear 0 working properly after a crash, System) 91 for how and where to seat, be sure to read Where to Put 0 see your dealer to have the install the child restraint using the Restraint 90. LATCH. If a child restraint is secured system inspected and any Double Cab necessary replacements made as in the vehicle using a seat belt and it uses a top tether, see Lower soon as possible. 1. Remove the head restraint or Anchors and Tethers for Children headrest prior to installing a (LATCH System) 0 91 for top tether forward-facing child restraint in If the vehicle has the LATCH system anchor locations. an outboard rear seating and it was being used during a Do not secure a child seat in a position. See “Head Restraint crash, new LATCH system parts position without a top tether anchor or Headrest Removal and may be needed. if a national or local law requires Reinstallation” under Lower New parts and repairs may be that the top tether be anchored, or if Anchors and Tethers for 0 necessary even if the LATCH the instructions that come with the Children (LATCH System) 91. system was not being used at the child restraint say that the top tether 2. Put the child restraint on time of the crash. must be anchored. the seat. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 105 3. Pick up the latch plate, and run the lap and shoulder portions of the vehicle seat belt through or around the child restraint. The child restraint instructions will show you how.

5. Pull the shoulder belt all the 6. To tighten the belt, push down way out of the retractor to set on the child restraint, pull the the lock. When the retractor shoulder portion of the belt to lock is set, the belt can be tighten the lap portion of the tightened but not pulled out of belt, and feed the shoulder belt the retractor. back into the retractor. When installing a forward-facing child 4. Push the latch plate into the restraint, it may be helpful to buckle until it clicks. use your knee to push down on the child restraint as you Position the release button on tighten the belt. the buckle, away from the child restraint, so that the seat belt Try to pull the belt out of the could be quickly unbuckled if retractor to make sure the necessary. retractor is locked. If the retractor is not locked, repeat Steps 5 and 6. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

106 Seats and Restraints 7. For forward-facing child Reinstallation” under Lower Anchors 3. Push the latch plate into the restraints, attach and tighten and Tethers for Children (LATCH buckle until it clicks. 0 the top tether to the top tether System) 91 for additional Position the release button on anchor (loop). Refer to the child information on installing the the buckle, away from the child restraint instructions, the headrest properly. restraint, so that the seat belt vehicle LATCH anchor weight Crew Cab could be quickly unbuckled if limits, and instructions listed in necessary. Lower Anchors and Tethers for 1. Put the child restraint on Children (LATCH System) 0 91. the seat. 8. Before placing a child in the 2. Pick up the latch plate, and run child restraint, make sure it is the lap and shoulder portions securely held in place. To of the vehicle seat belt through check, grasp the child restraint or around the child restraint. at the seat belt path and The child restraint instructions attempt to move it side to side will show you how. and back and forth. When the child restraint is properly installed, there should be no more than 2.5 cm (1 in) of movement. To remove the child restraint, 4. Pull the shoulder belt all the unbuckle the vehicle seat belt and way out of the retractor to set let it return to the stowed position. the lock. When the retractor If the top tether is attached to a top lock is set, the belt can be tether anchor, disconnect it. tightened but not pulled out of Reinstall the head restraint or the retractor. headrest before the seating position is used. See “Head Restraint or Headrest Removal and GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 107 6. If the child restraint has a top may be removed. See your dealer tether, follow the child restraint for assistance with removal, and manufacturer's instructions store the removed head restraint in regarding the use of the top a secure place. When the child tether. See Lower Anchors and restraint is removed, reinstall the Tethers for Children (LATCH head restraint before the seating System) 0 91 for more position is used. For reinstallation information on using the top instructions, see “Head Restraint or tether anchors. Headrest Removal and 7. Before placing a child in the Reinstallation” under Lower Anchors and Tethers for Children (LATCH child restraint, make sure it is 0 securely held in place. To System) 91. 5. To tighten the belt, push down check, grasp the child restraint on the child restraint, pull the at the seat belt path and Securing Child Restraints shoulder portion of the belt to attempt to move it side to side (In the Center Front Seat) tighten the lap portion of the and back and forth. When the belt, and feed the shoulder belt child restraint is properly { Warning back into the retractor. When installed, there should be no installing a forward-facing child more than 2.5 cm (1 in) of A child in a child restraint in the restraint, it may be helpful to movement. center front seat can be badly use your knee to push down on To remove the child restraint, injured or killed by the frontal the child restraint as you unbuckle the vehicle seat belt and airbags if they inflate. Never tighten the belt. let it return to the stowed position. secure a child restraint in the Try to pull the belt out of the If the top tether is attached to a top center front seat. It is always retractor to make sure the tether anchor, disconnect it. better to secure a child restraint in retractor is locked. If the For outboard rear seating positions, a rear seat. retractor is not locked, repeat if the child restraint cannot be Steps 4 and 5. installed properly with the head restraint in place, the head restraint GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

108 Seats and Restraints Do not use child restraints in the center front seat position. { Warning Warning (Continued) Securing Child Restraints A child in a rear-facing child forward-facing child restraint in restraint can be seriously injured the front outboard passenger (With the Seat Belt in the or killed if the front outboard seat, always move the seat as far Front Outboard Seat) passenger frontal airbag inflates. back as it will go. It is better to This is because the back of the secure the child restraint in a This vehicle has airbags. A rear seat is a safer place to secure a rear-facing child restraint would rear seat. forward-facing child restraint. See be very close to the inflating See Passenger Sensing System Where to Put the Restraint 0 90. airbag. A child in a forward-facing 0 77 for additional information. child restraint can be seriously In addition, the vehicle has a injured or killed if the front passenger sensing system which is outboard passenger frontal airbag If the vehicle does not have a rear designed to turn off the front inflates and the passenger seat is seat that will accommodate a outboard passenger frontal airbag in a forward position. rear-facing child restraint, a under certain conditions. See rear-facing child restraint should not Passenger Sensing System 0 77 Even if the passenger sensing be installed in the vehicle, even if and system has turned off the front the airbag is off. Passenger Airbag Status Indicator outboard passenger frontal If the child restraint uses a top 0 136 for more information, airbag, no system is fail-safe. No tether, see Lower Anchors and including important safety one can guarantee that an airbag information. Tethers for Children (LATCH will not deploy under some System) 0 91 for top tether anchor Never put a rear-facing child unusual circumstance, even locations. restraint in the front. This is because though it is turned off. Do not secure a child seat in a the risk to the rear-facing child is so Secure rear-facing child restraints great, if the airbag deploys. position without a top tether anchor in a rear seat, even if the airbag if a national or local law requires is off. If you secure a that the top tether be anchored, or if (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 109 the instructions that come with the lit when you start the vehicle. child restraint say that the top tether See Passenger Airbag Status must be anchored. Indicator 0 136. In Canada, the law requires that 2. Put the child restraint on forward-facing child restraints have the seat. a top tether, and that the tether be 3. Pick up the latch plate, and run attached. the lap and shoulder portions When using the lap-shoulder belt to of the vehicle seat belt through secure the child restraint in this or around the child restraint. position, follow the instructions that The child restraint instructions came with the child restraint and the will show you how. following instructions: 4. Push the latch plate into the 1. Move the seat as far back as it buckle until it clicks. will go before securing the forward-facing child restraint. Position the release button on Move the seat upward or the the buckle, away from the child seatback to an upright position, restraint, so that the seat belt if needed, to get a tight could be quickly unbuckled if installation of the child necessary. restraint. When the passenger sensing system has turned off the front outboard passenger frontal airbag, the OFF indicator on the passenger airbag status Tilt the latch plate to adjust the indicator should light and stay belt if needed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

110 Seats and Restraints 7. If the vehicle does not have a rear seat and the child restraint manufacturer recommends using a top tether anchor, attach the top tether to the top tether anchor. Refer to the instructions that came with the child restraint and to Lower Anchors and Tethers for Children (LATCH System) 0 91. 8. Before placing a child in the child restraint, make sure it is 5. Pull the shoulder belt all the 6. To tighten the belt, push down securely held in place. To way out of the retractor to set on the child restraint, pull the check, grasp the child restraint the lock. When the retractor shoulder portion of the belt to at the seat belt path and lock is set, the belt can be tighten the lap portion of the attempt to move it side to side tightened but not pulled out of belt, and feed the shoulder belt and back and forth. When the the retractor. back into the retractor. When child restraint is properly installing a forward-facing child installed, there should be no restraint, it may be helpful to more than 2.5 cm (1 in) of use your knee to push down on movement. the child restraint as you If the airbag is off, the OFF indicator tighten the belt. in the passenger airbag status Try to pull the belt out of the indicator will come on and stay on retractor to make sure the when the vehicle is started. retractor is locked. If the retractor is not locked, repeat Steps 5 and 6. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Seats and Restraints 111 If a child restraint has been installed and the ON indicator is lit, see “If the On Indicator Is Lit for a Child Restraint” under Passenger Sensing System 0 77. To remove the child restraint, unbuckle the vehicle seat belt and let it return to the stowed position. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

112 Storage Storage To access the lower glove box, Storage unlock with the key and pull down Compartments on the handle. Storage Compartments Storage Compartments ...... 112 { Warning Cupholders Glove Box ...... 112 Front Cupholders ...... 112 Do not store heavy or sharp Underseat Storage ...... 113 objects in storage compartments. There may be cupholders on the Rear Storage ...... 113 In a crash, these objects may center front seat console armrest. cause the cover to open and Center Console Storage ...... 113 Rear Floor Console Storage ...... 114 could result in injury. Additional Storage Features Cargo Tie-Downs ...... 115 Glove Box

If equipped, pull the rear seat armrest down to access the cupholders. To access the upper glove box, pull up on the handle. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Storage 113 Underseat Storage Rear Storage Center Console Storage

Bench Seat There may be storage under the There may be storage in the rear Pull the strap on the side of the rear passenger seat. Lift up on the seat. Pull the tab to access. center seatback to access the seat bench to access. Push the seat Push the storage door to close. The storage area and cupholders. Do bench toward the floor to close. storage door must be closed before not use the center seatback as a installing child restraints. seating position when the seatback is folded down. To raise the seatback, push the seatback rearward until it locks in the upright position. Push and pull on the seatback to make sure it is locked. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

114 Storage Floor Console Storage

Bench Seat Bucket Seat If equipped with storage, press the Press the latch and lift to open. latch and lift to open. If equipped with front center seat storage, unlock with the ignition key, press the latch, and lift to open. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Storage 115 Additional Storage Any of the 12 locations inside the Accessory Tie-Downs truck bed can be used. The Features maximum load per corner is 227 kg (500 lb). Cargo Tie-Downs CarbonPro Box

Caution

The truck bed walls will collapse if the tie-downs are overloaded.

Standard and Long Box Additional Accessory Tie-Down Points Any of the nine holes inside the truck bed can be used for tie-downs. The maximum load is 113 kg (250 lb) per tie-down.

Caution

The truck bed walls will collapse if the tie-downs are overloaded. This vehicle is equipped with 12 fixed cargo tie-downs. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

116 Storage To remove: 1. Remove the tie-down loop completely by turning counterclockwise while holding the backing plate against the truck bed wall. 2. Pull the backing plate away from the truck bed wall until a click is heard. This locks the toggle into position on the toggle guide. To install: 3. Push the backing plate against the truck bed wall. This allows 1. Insert a tie-down loop the toggle nut to spin. assembly until it is flush with the truck bed wall. 4. Remove the backing plate, toggle guide, and toggle nut 2. Turn the tie-down loop from the truck bed wall clockwise to tighten. The completely. tie-down will be hard to turn until the toggle moves past the 5. Reinstall the tie-down loop installation point on the toggle through the backing plate into guide. the toggle nut for reuse. 3. Fasten the tie-down firmly by hand only. Do not use tools. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 117 Voltmeter Gauge ...... 134 Electronic Stability Control Instruments and Seat Belt Reminders ...... 135 (ESC) Off Light ...... 143 Controls Airbag Readiness Light ...... 135 Engine Coolant Temperature Passenger Airbag Status Warning Light ...... 144 Indicator ...... 136 Driver Mode Control Light . . . . 144 Controls Charging System Light ...... 137 Tire Pressure Light ...... 144 Steering Wheel Adjustment . . . 118 Malfunction Indicator Lamp Engine Oil Pressure Light Steering Wheel Controls ...... 119 () ...... 137 (Uplevel Cluster) ...... 145 Heated Steering Wheel ...... 119 Brake System Warning Low Fuel Warning Light ...... 145 Horn ...... 119 Light ...... 139 Security Light ...... 146 Windshield Wiper/Washer . . . . 119 Electric Parking Brake High-Beam On Light ...... 146 Compass ...... 120 Light ...... 140 Front Fog Lamp Light ...... 146 Clock ...... 120 Service Electric Parking Brake Lamps On Reminder ...... 146 Power Outlets ...... 121 Light ...... 140 Cruise Control Light ...... 146 Wireless Charging ...... 122 Antilock Brake System (ABS) Door Ajar Light ...... 147 Warning Light ...... 140 Warning Lights, Gauges, and Four-Wheel-Drive Light ...... 141 Information Displays Indicators Tow/Haul Mode Light ...... 141 Driver Information Center (DIC) Warning Lights, Gauges, and Hill Descent Control Light . . . . 141 (Base Level) ...... 147 Indicators ...... 125 Lane Departure Warning Driver Information Center (DIC) Instrument Cluster ...... 126 (LDW) Light (2500/3500 (Midlevel and Uplevel) ...... 148 ...... 130 Series) ...... 141 Head-Up Display (HUD) ...... 152 ...... 131 Lane Keep Assist (LKA) Light Vehicle Messages Trip Odometer ...... 131 (1500 Series) ...... 142 Vehicle Messages ...... 155 ...... 131 Vehicle Ahead Indicator ...... 142 Engine Power Messages . . . . . 155 Fuel Gauge ...... 131 Pedestrian Ahead Indicator . . . 142 Vehicle Speed Messages . . . . . 156 Engine Oil Pressure Traction Off Light ...... 142 Gauge ...... 132 Traction Control System (TCS)/ Vehicle Personalization Engine Coolant Temperature Electronic Stability Control Vehicle Personalization ...... 156 Gauge ...... 133 Light ...... 143 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

118 Instruments and Controls Universal Remote System Controls Tilt and Telescoping Wheel Universal Remote System . . . . 161 Universal Remote System Programming ...... 161 Steering Wheel Universal Remote System Adjustment Operation ...... 164

To adjust the tilt and telescoping steering wheel, if equipped: 1. Pull the lever down. To adjust the steering wheel: 2. Move the steering wheel up or down. 1. Pull the lever down. 3. Pull or push the steering wheel 2. Move the steering wheel up closer or away from you. or down. 4. Pull the lever up to lock the 3. Pull the lever up to lock the steering wheel in place. steering wheel in place. Do not adjust the steering wheel while driving. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 119 Steering Wheel Controls Remote Start Heated Steering The windshield wiper control is on Wheel the turn signal lever. The infotainment system can be operated by using the steering If equipped with remote start, the The windshield wipers are controlled wheel controls. See “Steering Wheel heated steering wheel will turn on by turning the band with N on it. automatically during a remote start Controls” in the infotainment With the ignition on or in ACC/ manual. along with the heated seats when it is cold outside. The heated steering ACCESSORY, turn the N band to Heated Steering Wheel wheel indicator light may not select the wiper speed. come on. HI : Use for fast wipes. See Heated and Ventilated Front LO : Use for slow wipes. Seats 0 60. 3 : Turn the band up for more Horn frequent intermittent wipes or down for less frequent intermittent wipes. To sound the horn, press a on the OFF : Use to turn the wipers off. steering wheel. 1x : For a single wipe, briefly turn Windshield Wiper/Washer the N band down. For several wipes, hold the band down. L : Press L on the windshield wiper control to spray windshield ( : If equipped, press to turn it on or washer fluid and activate the wipers. off. A light next to the button The wipers will continue until L is displays when the feature is released or the maximum wash time turned on. is reached. When L is released, The steering wheel takes about three minutes to start heating. additional wipes may occur GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

120 Instruments and Controls depending on how long the Compass windshield washer had been { Warning The vehicle may have a compass 0 activated. See Washer Fluid 354 Before driving the vehicle, always display on the Driver Information for information on filling the clear snow and ice from the hood, Center (DIC). The compass receives windshield washer fluid reservoir. windshield, roof, and rear of the its heading and other information vehicle, including all lamps and from the Global Positioning Clear snow and ice from the wiper windows. Reduced visibility from System (GPS) antenna, Electronic blades before using them. If frozen Stability Control (ESC), and vehicle to the windshield, carefully loosen or snow and ice buildup could lead speed information. thaw them. Damaged blades should to a crash. be replaced. See Wiper Blade The compass system is designed to Replacement 0 364. Wipe Parking operate for a certain number of miles or degrees of turn before Heavy snow or ice can overload the If the ignition is turned off while the needing a signal from the GPS wiper motor. wipers are on LO, HI, or 3, they satellites. When the compass will immediately stop. display shows CAL, drive the { Warning If the windshield wiper control is ON vehicle for a short distance in an open area where it can receive a In freezing weather, do not use then moved to OFF before the driver door is opened or within 10 minutes, GPS signal. The compass system the washer until the windshield is will automatically determine when a warmed. Otherwise the washer the wipers will restart and move to the base of the windshield. GPS signal is restored and provide fluid can form ice on the a heading again. windshield, blocking your vision. If the ignition is turned off while the wipers are performing wipes due to Clock windshield washing, the wipers continue to run until they reach the The time and date for the clock can base of the windshield. be set using the infotainment system. See “Time/Date” in “System” under “Settings” in the infotainment manual. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 121 Power Outlets When adding electrical equipment, { Warning be sure to follow the proper Accessory power outlets can be installation instructions included with used to plug in electrical equipment, Power is always supplied to the the equipment. See Add-On such as a cell phone or MP3 player. outlets. Do not leave electrical Electrical Equipment 0 322. equipment plugged in when the vehicle is not in use because the Caution vehicle could catch fire and cause injury or death. Hanging heavy equipment from the power outlet can cause damage not covered by the Caution vehicle warranty. The power outlets are designed for Leaving electrical equipment accessory power plugs only, such plugged in for an extended period as cell phone charge cords. of time while the vehicle is off will drain the battery. Always unplug Rear of Front Center Console Power Outlet 110/120-Volt electrical equipment when not in Alternating Current The vehicle has one accessory use and do not plug in equipment power outlet under the climate that exceeds the maximum If equipped, the vehicle has two control system and one accessory 15 amp rating. alternating current power outlets. power outlet on the rear of the center console, if equipped, or on Certain power accessory plugs may the rear of the bench seat, not be compatible with the if equipped. accessory power outlet and could Lift the cover to access and replace overload vehicle or adapter fuses. when not in use. If a problem is experienced, see your dealer. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

122 Instruments and Controls When the ignition is on, power is If equipment is connected using supplied to the outlets after the DC/ more than 400 watts or a system AC switch is pressed. A green fault is detected, a protection circuit indicator light on the DC/AC switch shuts off the power supply and the indicates when the DC/AC operation indicator light turns off. is active. One power outlet can be Do not use a power outlet with a used with electrical equipment that missing or damaged cover. uses a maximum of 400 watts. If both outlets are being used, 400 The power outlet is not designed for watts will be shared between the the following, and may not work outlets. Ensure that all connected properly if they are plugged in: devices do not exceed 400 watts. . Equipment with high initial peak In Cab Power Outlet and DC/AC The power outlet can be turned off wattage, such as Switch by pressing the DC/AC switch. The compressor-driven refrigerators power outlet can be turned back on and electric power tools after 10 seconds, during which the . Other equipment requiring an indicator light on the switch will extremely stable power supply, flash. such as An indicator light on the outlet microcomputer-controlled illuminates when power is provided electric blankets and touch to the outlet and no system fault is sensor lamps detected. The outlets will not . Medical equipment operate when the ignition is off, the DC/AC switch is not pressed, or the Wireless Charging plug is not fully seated into the outlet. The vehicle may have wireless charging on the center console in Truck Bed Power Outlet front of the cupholders. The system operates at 145 kHz and wirelessly GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 123 charges one Qi compatible The operating temperature is −20 °C smartphone. The power output of (−4 °F) to 60 °C (140 °F) for the the system is capable of charging at charging system and 0 °C (32 °F) to a rate up to 3 amp (19.5 W) as 35 °C (95 °F) for the smartphone. requested by the compatible smartphone. See Radio Frequency { Warning Statement 0 472. Remove all objects from the { Warning charging pad before charging your compatible smartphone. Wireless charging can affect the Objects, such as coins, keys, operation of an implanted rings, paper clips, or cards, pacemaker or other medical between the smartphone and To charge a compatible smartphone: devices. If you have one, it is charging pad will become very recommended to consult with hot. On the rare occasion that the 1. Remove all objects from the charging pad. The system may your doctor before using the charging system does not detect not charge if there are any wireless charging system. an object, and the object gets objects between the wedged between the smartphone smartphone and charging pad. The vehicle must be on, in ACC/ and charger, remove the ACCESSORY, or Retained smartphone and allow the object 2. Place the smartphone face up Accessory Power (RAP) must be to cool before removing it from on the @ symbol on the active. The wireless charging the charging pad, to prevent charging pad. feature may not correctly indicate burns. To maximize the charge rate, charging when the vehicle is in RAP. ensure the smartphone is fully See Retained Accessory Power seated and centered in the 0 (RAP) 216. holder with nothing under it. A thick smartphone case may prevent the wireless charger from working, or may reduce GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

124 Instruments and Controls the charging performance. See The smartphone may become [email protected]. This offer is your dealer for additional warm during charging. This is valid for three (3) years from the information. normal. In warmer date on which you purchased the temperatures, the speed of product. 3. A green } will appear on the charging may be reduced. V on the infotainment display. Freescale-WCT library This indicates that the Software Acknowledgements Copyright (c) 2012-2014 Freescale smartphone is properly Certain Wireless Charging Module Semiconductor, Inc.. All rights positioned and charging. If a product from LG Electronics, Inc. reserved. smartphone is placed on the ("LGE") contains the open source 1. Redistributions of source code charging pad and does not } software detailed below. Refer to must retain the above copyright display, remove the the indicated open source licenses notice, this list of conditions smartphone from the pad, turn (as are included following this and the following disclaimer. it 180 degrees, and wait notice) for the terms and conditions three seconds before placing/ of their use. 2. Redistributions in binary form aligning the smartphone on the must reproduce the above OSS Notice Information pad again. copyright notice, this list of To obtain the source code that is conditions and the following 4. If } turns yellow, ensure that contained in this product, please disclaimer in the the charging pad is clear of any visit http://opensource.lge.com. In documentation and/or other objects and that the addition to the source code, all materials provided with the smartphone is capable of referred license terms, warranty distribution. wireless charging before disclaimers and copyright notices 3. Neither the name of the re-positioning it. If } does not are available for download. LG copyright holder nor the names illuminate, the smartphone may Electronics will also provide open of its contributors may be used need to re-positioned. source code to you on CD-ROM for to endorse or promote products a charge covering the cost of derived from this software performing such distribution (such without specific prior written as the cost of media, shipping, and permission. handling) upon email request to GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 125 THIS SOFTWARE IS PROVIDED OR PROFITS; OR BUSINESS Warning Lights, BY THE COPYRIGHT HOLDERS INTERRUPTION) HOWEVER AND CONTRIBUTORS "AS IS" CAUSED AND ON ANY THEORY Gauges, and AND ANY EXPRESS OR IMPLIED OF LIABILITY, WHETHER IN WARRANTIES, INCLUDING, BUT CONTRACT, STRICT LIABILITY, Indicators NOT LIMITED TO, THE IMPLIED OR TORT (INCLUDING Warning lights and gauges can WARRANTIES OF NEGLIGENCE OR OTHERWISE) signal that something is wrong MERCHANTABILITY AND FITNESS ARISING IN ANY WAY OUT OF before it becomes serious enough FOR A PARTICULAR PURPOSE THE USE OF THIS SOFTWARE, to cause an expensive repair or ARE DISCLAIMED. IN NO EVENT EVEN IF ADVISED OF THE replacement. Paying attention to the SHALL THE COPYRIGHT HOLDER POSSIBILITY OF SUCH DAMAGE. warning lights and gauges could OR CONTRIBUTORS BE LIABLE prevent injury. FOR ANY DIRECT, INDIRECT, Some warning lights come on briefly INCIDENTAL, SPECIAL, when the engine is started to EXEMPLARY, OR indicate they are working. When CONSEQUENTIAL DAMAGES one of the warning lights comes on (INCLUDING, BUT NOT LIMITED and stays on while driving, or when TO, PROCUREMENT OF one of the gauges shows there may SUBSTITUTE GOODS OR be a problem, check the section that SERVICES; LOSS OF USE, DATA, explains what to do. Waiting to do repairs can be costly and even dangerous. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

126 Instruments and Controls Instrument Cluster

1500 Series Base Cluster English Shown, 2500/3500 Series and Metric Similar GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 127

Midlevel Cluster English Shown, Metric Similar GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

128 Instruments and Controls

1500 Series Uplevel Cluster English Standard Shown, 2500/3500 Series and Metric Similar GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 129 Cluster Menu (Midlevel and . Home Fuel Range : Displays the Uplevel) . Info App. This is where the approximate distance the vehicle can be driven without refueling. The There is an interactive display area selected Driver Information Center (DIC) displays can be fuel range estimate is based on an in the center of the instrument average of the vehicle s fuel viewed. See “Driver Information ’ cluster. economy over recent driving history Center (DIC) (Uplevel)” in the Index. and the amount of fuel remaining in the fuel tank. Fuel range cannot be . Audio reset. . Navigation Audio . Phone In the Audio menu, use the . Options thumbwheel to scroll through options, browse for music, select Home from favorites, or change the audio Information displayed here can be source. In the main view, scroll to customized from the Options menu. change the station or go to the next or previous track. Speedometer : Displays how fast the vehicle is moving in either Navigation Use the right steering wheel control kilometers per hour (km/h) or miles In the Navigation menu, if there is to open and scroll through the per hour (mph). different items and displays. no active route, a compass will be Speed Sign : Shows sign displayed. If there is an active route, Press S or T to access the cluster information, which comes from a press the thumbwheel to cancel or applications. Use the thumbwheel to roadway database in the onboard resume route guidance, mute or scroll through the list of available navigation, if equipped. unmute voice guidance, or access features. Press the thumbwheel to Time : Displays the current time. Recents or Favorites. select. Not all applications will be available on all vehicles. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

130 Instruments and Controls Phone Speed Limit Style: Press the Speed Warning : The Speed In the Phone menu, if there is no thumbwheel while Speed Limit Style Warning display allows the driver to active phone call, view recent calls, is highlighted to change the speed set a speed that they do not want to scroll through contacts, select from sign style. exceed. To set the Speed Warning, the favorites, or change the phone Units : Press the thumbwheel while press the thumbwheel when Speed source. If there is an active call, Units is displayed to enter the Units Warning is displayed, or press the mute the phone or switch to handset menu. Choose US or metric units by thumbwheel on the main view to set operation. pressing the thumbwheel while the the speed value. Scroll to adjust the desired item is highlighted. value. Press the thumbwheel to set Options A selected mark will be displayed the speed. Once the speed is set, Use the thumbwheel to scroll next to the selected item. this feature can be turned off by through items in the Options menu. pressing the thumbwheel while Info Page Options : Press the viewing this page. If the selected Head-up Display (HUD) : thumbwheel while Info Page speed limit is exceeded, a pop-up If equipped, this feature allows for Options is displayed to enter and warning is displayed with a chime. adjusting the angle of the HUD select the items to be displayed in image and changing or turning off the Info app. A selected mark will be Software Information : Press the the Speed Limit Sign. displayed next to the selected item. thumbwheel while Software Information is highlighted to display HUD Rotation: Press the Home : Press the thumbwheel to open source software information. thumbwheel while Adjust Rotation is select the available elements to highlighted to enter Adjust Mode. display. Not all elements will be Speedometer Scroll to adjust the angle of the available on all vehicles: HUD display. Press the thumbwheel Speedometer, Speed Sign, Time, The speedometer shows the to confirm and save the setting. This and Fuel Range. vehicle's speed in either kilometers feature may only be available in per hour (km/h) or miles per Display (Uplevel) : Press the hour (mph). P (Park). thumbwheel to enter the Display Speed Limit: Press the thumbwheel menu. Select to turn on or off the while Speed Limit is highlighted to compass or speed sign. turn it on or off. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 131 Odometer For vehicles with the Stop/Start Fuel Gauge system, when the ignition is on, the The odometer shows how far the tachometer indicates the vehicle vehicle has been driven, in either status. When pointing to AUTO kilometers or miles. The odometer STOP, the engine is off but the displays on the Speed page of the vehicle is on and can move. The Driver Information Center (DIC). engine could auto start at any time. When the indicator points to OFF, Trip Odometer the vehicle is off. The trip odometer shows how far When the engine is on, the the vehicle has been driven since tachometer will indicate the engine’s the trip odometer was last reset. revolutions per minute (rpm). The The trip odometer is accessed and tachometer may vary by several hundred rpm’s, during Auto Stop reset through the Driver Information Midlevel Metric Fuel Gauge Center (DIC). See Driver mode, when the engine is shutting off and restarting. Shown, Base Level and Uplevel Information Center (DIC) (Base Fuel Gauge Similar Level) 0 147 or Driver Information Center (DIC) (Midlevel and Uplevel) 0 148. Tachometer The tachometer displays the engine speed in revolutions per minute (rpm). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

132 Instruments and Controls Here are four things that some Engine Oil Pressure owners ask about. None of these show a problem with the fuel gauge: Gauge . At the service station, the fuel pump shuts off before the gauge reads full. . It takes a little more or less fuel to fill up than the gauge indicated. For example, the gauge may have indicated the tank was half full, but it actually took a little more or less than Midlevel English Fuel Gauge half the tank's capacity to fill Shown, Base Level and Uplevel the tank. Fuel Gauge Similar . The gauge moves a little while Midlevel Metric Shown, Base Level When the ignition is on, the fuel turning a corner or speeding up. and Uplevel Similar gauge indicates about how much fuel is left in the tank. . The gauge takes a few seconds to stabilize after the ignition is There is an arrow near the fuel turned on, and goes back to gauge pointing to the side of the empty when the ignition is vehicle the fuel door is on. turned off. When the indicator nears empty, the low fuel light comes on. There still is a little fuel left, but the vehicle should be refueled soon. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 133 Information Center (DIC) message Engine Coolant indicates oil pressure outside the normal operating range, check the Temperature Gauge vehicle's oil as soon as possible. See Engine Oil 0 339.

Caution

Lack of proper engine oil maintenance can damage the engine. Driving with the engine oil low can also damage the engine. Midlevel English Shown, Base The repairs would not be covered Level and Uplevel Similar by the vehicle warranty. Check the oil level as soon as possible. The engine oil pressure gauge Midlevel Metric Shown, Base Level shows the engine oil pressure Add oil if required, but if the oil and Uplevel Similar in kPa (kilopascals) or psi (pounds level is within the operating range per square inch) when the engine is and the oil pressure is still low, running. have the vehicle serviced. Always Oil pressure can vary with engine follow the maintenance schedule speed, outside temperature, coolant for changing engine oil. temperature, and oil viscosity. On some models, the oil pump will If the vehicle has a , vary engine oil pressure according see the Duramax diesel to engine needs. Oil pressure may supplement. change quickly as the engine speed or load varies. This is normal. If the oil pressure warning light or Driver GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

134 Instruments and Controls Voltmeter Gauge The voltmeter gauge may also read lower when in fuel economy mode. This is normal. Readings outside the normal operating range can also occur when a large number of electrical accessories are operating in the vehicle and the engine is left idling for an extended period. This condition is normal since the charging system is not able to provide full power at engine idle. As Midlevel English Shown, Base engine speeds are increased, this Level and Uplevel Similar condition should correct itself as Midlevel Shown, Base Level and higher engine speeds allow the This gauge measures the Uplevel Similar charging system to create maximum temperature of the vehicle's engine power. coolant. When the ignition is on, this gauge indicates the battery voltage. The vehicle can only be driven for a While driving under normal short time with the readings outside operating conditions, if the needle When the engine is running, this the normal operating range. If the moves into the red warning area, gauge shows the condition of the vehicle must be driven, turn off all the engine is too hot. Pull off the charging system. The gauge can accessories, such as the radio and road, stop the vehicle, and turn off transition from a higher to lower or a air conditioner. the engine as soon as possible. lower to higher reading. This is normal. If the vehicle is operating Readings outside the normal outside the normal operating range, operating range indicate a possible the charging system light comes on. problem in the electrical system. 0 See Charging System Light 137. Have the vehicle serviced as soon as possible. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 135 Seat Belt Reminders Passenger Seat Belt Reminder The front passenger seat belt Light reminder light and chime may turn Driver Seat Belt Reminder on if an object is put on the seat Light There may be a passenger seat belt such as a briefcase, handbag, reminder light near the passenger grocery bag, laptop, or other There is a driver seat belt reminder airbag status indicator. See electronic device. To turn off the light on the instrument cluster. 0 Passenger Sensing System 77. reminder light and/or chime, remove the object from the seat or buckle the seat belt. Airbag Readiness Light This light shows if there is an electrical problem with the airbag When the vehicle is started, this For vehicles equipped with the system. The system check includes light flashes and a chime may come passenger seat belt reminder light, the airbag sensor(s), the passenger on to remind the driver to fasten when the vehicle is started this light sensing system, the pretensioners, their seat belt. Then the light stays flashes and a chime may come on the airbag modules, the wiring, and on solid until the belt is buckled. to remind passengers to fasten their the crash sensing and diagnostic This cycle may continue several seat belt. Then the light stays on module. For more information on the times if the driver remains or solid until the belt is buckled. This airbag system, see Airbag System 0 becomes unbuckled while the cycle continues several times if the 71. vehicle is moving. passenger remains or becomes If the driver seat belt is buckled, unbuckled while the vehicle is neither the light nor the chime moving. comes on. If the passenger seat belt is buckled, neither the chime nor the light comes on. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

136 Instruments and Controls The airbag readiness light comes on safety information. The overhead If the word ON or the on symbol is for several seconds when the console has a passenger airbag lit on the passenger airbag status vehicle is started. If the light does status indicator. indicator, it means that the front not come on then, have it fixed outboard passenger frontal airbag is immediately. allowed to inflate. If the word OFF or the off symbol is { Warning lit on the passenger airbag status indicator, it means that the If the airbag readiness light stays passenger sensing system has on after the vehicle is started or United States turned off the front outboard comes on while driving, it means passenger frontal airbag. the airbag system might not be working properly. The airbags in If, after several seconds, both status indicator lights remain on, or if there the vehicle might not inflate in a are no lights at all, there may be a crash, or they could even inflate problem with the lights or the without a crash. To help avoid passenger sensing system. See injury, have the vehicle serviced your dealer for service. right away. Canada When the vehicle is started, the { Warning If there is a problem with the airbag passenger airbag status indicator system, a Driver Information Center will light ON and OFF, or the If the airbag readiness light ever (DIC) message may also come on. symbols for on and off, for several comes on and stays on, it means seconds as a system check. Then, that something may be wrong Passenger Airbag Status after several more seconds, the with the airbag system. To help Indicator status indicator will light either ON avoid injury to yourself or others, or OFF, or either the on or off have the vehicle serviced right The vehicle has a passenger symbol, to let you know the status of (Continued) sensing system. See Passenger the front outboard passenger frontal Sensing System 0 77 for important airbag. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 137 When this light comes on, or is Warning (Continued) flashing, the Driver Information Center (DIC) also displays a away. See Airbag Readiness message. Light 0 135 for more information, including important safety If a short distance must be driven information. with the light on, be sure to turn off all accessories, such as the radio Malfunctions are often indicated by and air conditioner. the system before any problem is Charging System Light noticeable. Being aware of the light Malfunction Indicator and seeking service promptly when Lamp (Check Engine it comes on may prevent damage. Light) Caution This light is part of the vehicle’s emission control on-board If the vehicle is driven continually diagnostic system. If this light is on with this light on, the emission The charging system light comes on while the engine is running, a control system may not work as briefly when the ignition is turned malfunction has been detected and well, the fuel economy may be on, but the engine is not running, as the vehicle may require service. The lower, and the vehicle may not a check to show the light is working. light should come on to show that it run smoothly. This could lead to It should go out when the engine is is working when the ignition is on costly repairs that might not be started. and the engine is not running. See covered by the vehicle warranty. Ignition Positions (Keyless Access) If the light stays on, or comes on 0 208 or while driving, there may be a Ignition Positions (Key Access) problem with the electrical charging 0 210. system. Have it checked by your dealer. Driving while this light is on could drain the battery. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

138 Instruments and Controls If towing a trailer, reduce the evaporate into the atmosphere. Caution amount of cargo being hauled as A few driving trips with the soon as possible. adapter removed may turn off Modifications to the engine, the light. transmission, exhaust, intake, If the light continues to flash, find a or fuel system, or the use of safe place to park. Turn the vehicle . Poor fuel quality can cause replacement tires that do not off and wait at least 10 seconds inefficient engine operation and meet the original tire before restarting the engine. If the poor driveability, which may go specifications, can cause this light light is still flashing, follow the away once the engine is warmed previous guidelines and see your up. If this occurs, change the to come on. This could lead to dealer for service as soon as fuel brand. It may require at costly repairs not covered by the possible. least one full tank of the proper vehicle warranty. This could also fuel to turn the light off. See affect the vehicle’s ability to pass If the light is on steady : A malfunction has been detected. Recommended Fuel (Except an Emissions Inspection/ 6.2L V8 Engine) 0 280 or Maintenance test. See Diagnosis and service may be required. Recommended Fuel (6.2L Accessories and Modifications V8 Engine) 0 281. 0 329. Check the following: If the light remains on, see your . If fuel has been added to the dealer. If the light is flashing : A vehicle using the capless funnel malfunction has been detected that adapter, make sure that it has Emissions Inspection and could damage the emission control been removed. See “Filling the Maintenance Programs system and increase vehicle Tank with a Portable Gas Can” If the vehicle requires an Emissions emissions. Diagnosis and service under Filling the Tank (Pickup Inspection/Maintenance test, the 0 may be required. Model) 283 or test equipment will likely connect to Filling the Tank ( Cab To help prevent damage, reduce the vehicle's Data Link Model) 0 285. The diagnostic vehicle speed and avoid hard Connector (DLC). system can detect if the adapter accelerations and uphill grades. has been left installed in the vehicle, allowing fuel to GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 139 before the system is ready for If the light comes on while driving, inspection. This can happen if pull off the road and stop carefully. the 12-volt battery has recently If equipped with electric brake been replaced or run down, or if boost, vehicle speed may be limited the vehicle has been recently when the brake system warning serviced. light comes on. The brake pedal See your dealer if the vehicle will might be harder to push, or the The DLC is under the instrument brake pedal may go closer to the panel to the left of the steering not pass or cannot be made ready for the test. floor. It could take longer to stop. wheel. Connecting devices that are If the light is still on, have the not used to perform an Emissions vehicle towed for service. See Inspection/Maintenance test or to Brake System Warning Towing the Vehicle 0 424. service the vehicle may affect Light vehicle operation. See Add-On Electrical Equipment 0 322. See { Warning your dealer if assistance is needed. The brake system might not be The vehicle may not pass working properly if the brake inspection if: system warning light is on. . The light is on when the engine Driving with the brake system Metric English is running. warning light on can lead to a crash. If the light is still on after . The light does not come on This light should come on briefly the vehicle has been pulled off when the ignition is on while the when the vehicle is turned on. If it the road and carefully stopped, engine is off. does not come on then, have it fixed so it will be ready to warn you if have the vehicle towed for . Critical emission control systems there is a problem. service. have not been completely diagnosed. If this happens, the If the light comes on and stays on at vehicle would not be ready for start up, there is a brake problem. inspection and might require Have the brake system inspected several days of routine driving right away. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

140 Instruments and Controls Electric Parking Brake Service Electric Parking Antilock Brake System Light Brake Light (ABS) Warning Light

Metric English This light should come on briefly This warning light should come on This light comes on when the when starting the vehicle. If it does briefly when the vehicle is turned parking brake is applied. If the light not come on, have it fixed so it will on. If the light does not come on, continues flashing after the parking be ready to warn if there is a have it fixed so it will be ready to brake is released, or while driving, problem. warn if there is a problem. there is a problem with the Electric Parking Brake system. A message If this light stays on, take the vehicle If the light comes on while driving, may also display in the Driver to your dealer as soon as possible. safely stop as soon as it is possible Information Center (DIC). See the information for the Electric and turn off the vehicle. Then turn Parking Brake under Electric on the vehicle again to reset the If the light does not come on, Parking Brake 0 233. A message system. or remains flashing, see your dealer. may also display in the Driver If the ABS warning light stays on, Information Center (DIC). or comes on again while driving, the vehicle needs service. A chime may also sound when the light stays on. If the ABS warning light is the only light on, the vehicle has regular , but ABS is not functioning. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 141 If both the ABS warning light and If the light turns amber, there may If equipped, the Hill Descent Control the brake system warning light are be a malfunction with the light comes on when the system is on, ABS is not functioning and there four-wheel-drive system. See your ready for use. When the light is a problem with the regular brakes. dealer. flashes, the system is active. See your dealer for service. See Four-Wheel Drive 0 227. See Hill Descent Control (HDC) See Brake System Warning Light 0 237. 0 139. Tow/Haul Mode Light Lane Departure Warning Four-Wheel-Drive Light (LDW) Light (2500/3500 Series)

For vehicles with the Tow/Haul Auto Mode Shown, Other Modes Mode feature, this light comes on Similar when the Tow/Haul Mode has been activated. If equipped, the four-wheel-drive If equipped, this light comes on light displays what mode the vehicle See Tow/Haul Mode 0 227. briefly while starting the vehicle. If it is in. The light will show each mode: does not come on, have the vehicle 2WD, 4HI, AUTO (all transfer Hill Descent Control Light serviced. cases); 4LOW and N (two-speed This light is green if LDW is on and transfer case only). ready to operate. The light will flash when a shift is in This light changes to amber and progress. Once the shift is complete flashes to indicate that the lane the light will be steady. marking has been crossed without using a turn signal in that direction. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

142 Instruments and Controls See Lane Departure Warning (LDW) LKA will not assist or alert if the turn Pedestrian Ahead (2500/3500 Series) 0 276. signal is active in the direction of lane departure, or if LKA detects Indicator Lane Keep Assist (LKA) that you are accelerating, braking, Light (1500 Series) or actively steering. See Lane Keep Assist (LKA) (1500 Series) 0 278. Vehicle Ahead Indicator If equipped, this indicator will display amber when a nearby pedestrian is detected in front of the After the vehicle is started, this light vehicle. turns off and stays off if LKA has not See Front Pedestrian Braking (FPB) been turned on or is unavailable. System (1500 Series) 0 272. If available, this light is white if LKA is turned on, but not ready to assist. If equipped, this indicator will Traction Off Light This light is green if LKA is turned display green when a vehicle is on and is ready to assist. detected ahead and amber when you are following a vehicle ahead LKA may assist by gently turning much too closely. the steering wheel if the vehicle approaches a detected lane See Forward Collision Alert (FCA) 0 marking. The LKA light is amber System 268. when assisting. This light flashes amber as a Lane This light comes on briefly while Departure Warning (LDW) alert, to starting the engine. If it does not, indicate that the lane marking has have the vehicle serviced by your been crossed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 143 dealer. If the system is working If equipped, the Electronic Stability This light will flash when Trailer normally, the indicator light then Control (ESC) or TCS indicator/ Sway Control is active. See Trailer turns off. warning light comes on briefly when Sway Control (TSC) 0 308. The traction off light comes on when the engine is started. the Traction Control System (TCS) If the light does not come on, have Electronic Stability has been turned off by pressing and the vehicle serviced by your dealer. Control (ESC) Off Light releasing the TCS/ESC button. If the system is working normally, This light and the Electronic Stability the indicator light turns off. Control (ESC) OFF light come on If the light is on and not flashing, the when ESC is turned off. TCS, and potentially the ESC If the TCS is off, wheel spin is not system have been disabled. limited. Adjust driving accordingly. If the indicator/warning light is on See Traction Control/Electronic and flashing, the TCS and/or the ESC system is actively working. This light comes on briefly while Stability Control 0 235. starting the engine. If it does not, See Traction Control/Electronic have the vehicle serviced by your Traction Control System Stability Control 0 235. dealer. (TCS)/Electronic Stability Trailer Sway Control Light This light comes on when the ESC Control Light (Uplevel Cluster) system is turned off. If ESC is off, the Traction Control System (TCS) is also off. If the ESC and TCS are off, the system does not assist in controlling the vehicle. Turn on the TCS and the ESC systems and the warning light turns off. See Traction Control/Electronic Stability Control 0 235. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

144 Instruments and Controls Engine Coolant The engine coolant temperature warning light comes on when the Temperature Warning engine has overheated. Light If this happens, pull over and turn off the engine as soon as possible. See Engine Overheating 0 351. This light comes on when Terrain Driver Mode Control Light Mode is selected (1500 Series).

This light comes on briefly while starting the vehicle. If it does not, have the vehicle serviced by your dealer. If the system is working normally the This light comes on when Sport This light comes on when Off-Road indicator light goes off. Mode is selected (1500 Series). Mode is selected.

Caution Tire Pressure Light

The engine coolant temperature warning light indicates that the vehicle has overheated. Driving with this light on can damage the engine and it may not be covered This light comes on when Snow/Ice by the vehicle warranty. See Mode is selected. Engine Overheating 0 351. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 145 For vehicles with the Tire Pressure Engine Oil Pressure Light This light should come on briefly as Monitor System (TPMS), this light the engine is started. If it does not comes on briefly when the engine is (Uplevel Cluster) come on, have the vehicle serviced started. It provides information by your dealer. Caution about tire pressures and the TPMS. If the light comes on and stays on, it When the Light Is On Steady Lack of proper engine oil means that oil is not flowing through the engine properly. The vehicle This indicates that one or more of maintenance can damage the engine. Driving with the engine oil could be low on oil and might have the tires are significantly some other system problem. See low can also damage the engine. underinflated. your dealer. The repairs would not be covered A Driver Information Center (DIC) tire pressure message may also by the vehicle warranty. Check Low Fuel Warning Light display. Stop as soon as possible, the oil level as soon as possible. and inflate the tires to the pressure Add oil if required, but if the oil value shown on the Tire and level is within the operating range Loading Information label. See Tire and the oil pressure is still low, Pressure 0 387. have the vehicle serviced. Always follow the maintenance schedule When the Light Flashes First and for changing engine oil. Then Is On Steady If the light flashes for about a minute This light is near the fuel gauge and and then stays on, there may be a comes on briefly when the ignition is problem with the TPMS. If the turned on as a check to show it is problem is not corrected, the light working. will come on at every ignition cycle. It also comes on when the fuel tank See Tire Pressure Monitor is low on fuel. The light turns off Operation 0 390. when fuel is added. If it does not, have the vehicle serviced. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

146 Instruments and Controls Security Light This light comes on when the The light goes out when the fog high-beam headlamps are in use. lamps are turned off. See Fog See Headlamp High/Low-Beam Lamps 0 170. Changer 0 167. IntelliBeam Light Lamps On Reminder

The security light should come on briefly as the engine is started. If it does not come on, have the vehicle serviced by your dealer. If the system is working normally, the This light comes on when the This light comes on when the indicator light turns off. IntelliBeam system, if equipped, is exterior lamps are in use, except when only the Daytime Running If the light stays on and the engine enabled. See Exterior Lamp Lamps (DRL) are active. See does not start, there could be a Controls 0 165. Exterior Lamp Controls 0 165. problem with the theft-deterrent system. See Immobilizer Operation Front Fog Lamp Light 0 37. Cruise Control Light High-Beam On Light

For vehicles with fog lamps, this light comes on when the fog lamps are on. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 147 For vehicles with cruise control, the Information Displays . Air Filter Life cruise control light is white when the . Brake Pad Life cruise control is on and ready, and turns green when the cruise control Driver Information Center Digital Speedometer is set and active. (DIC) (Base Level) The speedometer shows how fast The light turns off when the cruise The DIC displays are shown in the the vehicle is moving in either control is turned off. See Cruise center of the instrument cluster. The kilometers per hour (km/h) or miles Control 0 243. displays show the status of many per hour (mph). The speedometer vehicle systems. The trip odometer cannot be reset. reset stem in the instrument cluster Door Ajar Light Trip 1 or 2 and Average Fuel is used to access the DIC menu Economy items. Turn the trip odometer reset stem If the vehicle has a diesel engine, until TRIP 1 or TRIP 2 displays. The see the Duramax diesel supplement current distance traveled, in either for more information. kilometers (km) or miles (mi), since DIC Menu Items the last reset for the trip odometer is shown, as well as the average fuel This light comes on when a door is Turn the trip odometer reset stem to economy. The trip odometer and the open or not securely latched. Before scroll through the following menu average fuel economy can be reset driving, check that all doors are items: by pressing and holding the trip properly closed. . Digital Speedometer odometer reset stem. . Trip 1/2 Fuel Range . Fuel Range This display shows the approximate . Tire Pressure distance the vehicle can be driven without refueling. The fuel range . Remaining Oil Life estimate is based on an average of the vehicle's fuel economy over GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

148 Instruments and Controls recent driving history and the system monitoring the oil life, When the REPLACE SOON amount of fuel remaining in the fuel additional maintenance is message displays, the engine air tank. Fuel range cannot be reset. recommended. See Maintenance filter should be replaced at the Schedule 0 441. earliest convenience. Tire Pressure The Oil Life display must be reset The Air Filter Life display must be Turn the trip odometer reset stem after each oil change. It will not reset after the engine air filter until a vehicle with the approximate reset itself. Do not reset the Oil Life replacement. To reset, see Engine pressures of all four tires displays. display at any time other than when Air Filter Life System 0 343. Tire pressure is displayed in either the oil has just been changed. kilopascal (kPa) or in pounds per It cannot be reset accurately until Brake Pad Life square inch (psi). the next oil change. To reset the This displays an estimate of the See Tire Pressure Monitor System engine oil life system, see Engine remaining life of the front and rear 0 389 and Oil Life System 0 341. brake pads. Messages will display Tire Pressure Monitor Operation based on brake pad wear and the 0 390. Air Filter Life state of the system. Reset the Brake Turn the trip odometer reset stem Pad Life display after replacing the Remaining Oil Life until AIR FILTER LIFE displays. brake pads. See Brake Pad Life Turn the trip odometer reset stem This displays an estimate of the System 0 356. until REMAINING OIL LIFE engine air filter’s remaining useful displays. An estimate of the oil's life and the state of the system. Driver Information Center remaining useful life is shown. Engine Air Filter Life 95% means (DIC) (Midlevel and REMAINING OIL LIFE 99% means 95% of the current air filter life 99% of the current oil life remains. remains. Messages will display Uplevel) When the remaining oil life is low, based on the engine air filter life and The DIC displays are shown in the the CHANGE ENGINE OIL SOON the state of the system. center of the instrument cluster in message will appear on the display. When the REPLACE AT NEXT OIL the Info app. See Instrument Cluster The oil should be changed as soon CHANGE message displays, the 0 126. The displays show the status as possible. See Engine Oil 0 339. engine air filter should be replaced of many vehicle systems. In addition to the engine oil life at the time of the next oil change. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 149 If the vehicle has a diesel engine, 1. Press T to scroll to the settings by pressing and holding K see the Duramax diesel Options application. on the left steering wheel controls supplement. and the thumbwheel on the right 2. Scroll y or z to choose Info steering wheel controls at the pages and press the same time. thumbwheel. Speed : Shows the vehicle speed in 3. Scroll y or z to move either kilometers per hour (km/h) or through the list of possible miles per hour (mph). The vehicle information displays. odometer is also shown on this page. If equipped, press the 4. Press the thumbwheel while an item is highlighted to select or thumbwheel to open the menu and select to display speed limit signs. deselect that item. Speed limit signs in your vehicle The info pages can also be turned display may vary from actual road on or off through the DIC page Info Page Options. speed depending on the version of your current navigation map. S or T : Press to move left or right Info Pages Trip 1 or Trip 2, and Average Fuel between the interactive display The following is the list of all Economy : Shows the current zones in the cluster. Press the possible DIC info page displays. distance traveled, in either thumbwheel to select. Some may not be available for your kilometers (km) or miles (mi), since y or z : Use the thumbwheel to particular vehicle. Some items may the trip odometer was last reset. scroll up or down in a list. Press the not be turned on by default but can The Average Fuel Economy display thumbwheel to select. be turned on through the Options shows the approximate average app. See “Info Page Options” earlier Info Page Options liters per 100 kilometers (L/100 km) in this section. or miles per gallon (mpg). This The info pages on the DIC can be While in the Info Page Options number is calculated based on the turned on or off through the menu, the info pages can be number of L/100 km (mpg) recorded Options menu. restored to the default factory since the last time this menu item GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

150 Instruments and Controls was reset. This number reflects only Press the thumbwheel while this Tire Pressure : Shows the the approximate average fuel display is active to reset the timer. approximate pressures of all four economy that the vehicle has right Oil Life : Shows an estimate of the tires. Tire pressure is displayed in now, and will change as driving oil's remaining useful life. either kilopascal (kPa) or in pounds conditions change. If REMAINING OIL LIFE 99% is per square inch (psi). If the pressure Press the thumbwheel while this displayed, that means 99% of the is low, the value for that tire is display is active to reset the trip current oil life remains. shown in amber. See Tire Pressure Monitor System 0 389 and odometer and the average fuel When the remaining oil life is low, economy. Tire Pressure Monitor Operation the CHANGE ENGINE OIL SOON 0 390. Fuel Range : Shows the message will appear on the display. approximate distance the vehicle The oil should be changed as soon Air Filter Life : Shows an estimate can be driven without refueling. as possible. See Engine Oil 0 339. of the engine air filter’s remaining LOW will be displayed when the In addition to the engine oil life useful life and the state of the vehicle is low on fuel. The fuel system monitoring the oil life, system. Engine Air Filter Life 95% range estimate is based on an additional maintenance is means 95% of the current air filter average of the vehicle's fuel recommended. See Maintenance life remains. Messages will display economy over recent driving history Schedule 0 441. based on the engine air filter life and the state of the system. When the and the amount of fuel remaining in The Oil Life display must be reset the fuel tank. REPLACE AT NEXT OIL CHANGE after each oil change. It will not message displays, the engine air Timer : This display can be used as reset itself. Do not reset the Oil Life filter should be replaced at the time a timer. To start the timer, press the display at any time other than when of the next oil change. When the thumbwheel while this display is the oil has just been changed. REPLACE SOON message active. The display will show the It cannot be reset accurately until displays, the engine air filter should amount of time that has passed the next oil change. To reset the be replaced at the earliest since the timer was last reset. To engine oil life system, press the convenience. stop the timer, press the thumbwheel while the Oil Life thumbwheel briefly while this display display is active. See Engine Oil is active and the timer is running. Life System 0 341. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 151 The Air Filter Life display must be Engine Hours (Hourmeter) : Off Road : Displays vehicle pitch reset after the engine air filter Shows the total number of hours the and roll information, road wheel replacement. To reset, see Engine engine has run. This display also angle, and four-wheel drive (4WD) Air Filter Life System 0 343. shows the engine idle hours. status. Brake Pad Life : This displays an Transmission Fluid Follow Distance : If equipped, the estimate of the remaining life of the Temperature : Shows the current follow time to the vehicle front and rear brake pads. temperature of the automatic ahead is displayed as a time value Messages will display based on transmission fluid in either degrees on this page. brake pad wear and the state of the Celsius (°C) or degrees Driver Assistance : If equipped, system. Reset the Brake Pad Life Fahrenheit (°F). shows information for Lane Keep display after replacing the brake Trailer Brake : On vehicles with the Assist (LKA) and Forward Collision pads. See Brake Pad Life System Integrated Trailer Brake Control Alert (FCA). 0 356. (ITBC) system, the trailer brake Info Page Options : Scroll to Fuel Economy : Displays average display appears in the DIC. choose which info pages appear on fuel economy, the best fuel TRAILER GAIN shows the trailer the DIC. Press the thumbwheel to economy over the selected gain setting. This setting can be select or deselect. distance, and a bar graph showing adjusted from 0.0 to 10.0 with either instantaneous fuel economy. Blank Page : Shows no a trailer connected or disconnected. information. Press the thumbwheel to change TRAILER OUTPUT shows the the selected distance. Press and power output to the trailer any time hold the thumbwheel while this a trailer with electric brakes is display is active to reset the best connected. Output is displayed as a fuel economy and average fuel bar graph. Dotted lines may appear economy. This display can also be in the OUTPUT display if a trailer is reset by selecting reset in the menu. not connected. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

152 Instruments and Controls Head-Up Display (HUD) Caution

{ Warning If you try to use the HUD image as a parking aid, you may If the HUD image is too bright or misjudge the distance and too high in your field of view, it damage your vehicle. Do not use may take you more time to see the HUD image as a parking aid. things you need to see when it is dark outside. Be sure to keep the HUD image dim and placed low in The HUD information can be your field of view. displayed in various languages. The speedometer reading and other numerical values can be displayed HUD Display on the Windshield If equipped with HUD, some in either English or metric units. information about the operation of Depending on how the vehicle is The language selection is changed the vehicle is projected onto the equipped, the HUD may display through the radio, and the units of windshield. The image is projected some of the following vehicle measurement is changed through through the HUD lens on top of the information and vehicle messages the instrument cluster. See instrument panel. The information or alerts: Settings in the infotainment appears as an image focused out “ ” . Speed manual and Options under toward the front of the vehicle. “ ” Instrument Cluster 0 126. . Audio . Phone . Navigation . Driver Assistance Features . Vehicle Messages GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 153 Some vehicle messages or alerts ! : Press to select the display HUD Rotation: Press the displayed in the HUD may be view. Each press will change the thumbwheel while Adjust Rotation is cleared by using the steering wheel display view. highlighted to enter Adjust Mode. controls. Scroll to adjust the angle of the D : Pull and hold to brighten the HUD display. Press the thumbwheel display. Press and hold to dim the to confirm and save the setting. This display. Continue to hold to turn the feature may only be available in display off. P (Park). The HUD image will automatically Speed Limit Style Adjustment dim and brighten to compensate for outside lighting. Use D to adjust If equipped, the speed limit style can be changed to a speed limit bar as needed. or speed limit sign from the Options The HUD image can temporarily menu in the instrument cluster. The HUD control is to the left of the light up depending on the angle and Press the thumbwheel while Speed steering wheel. position of sunlight on the HUD Limit Style is highlighted to change display. This is normal. the speed sign style or to turn it off. To adjust the HUD image: Polarized sunglasses could make HUD Views 1. Adjust the driver seat. the HUD image harder to see. There are four views in the HUD. 2. Start the engine. Head-Up Display (HUD) Rotation Some vehicle information and 3. Use the following settings to Option vehicle messages or alerts may be adjust the HUD. displayed in any view. If equipped, this feature under the $ : Press or pull to center the Options menu of the instrument HUD image. The HUD image can cluster allows for adjusting the angle only be adjusted up and down, not of the HUD image and changing or side to side. turning off the Speed Limit Sign. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

154 Instruments and Controls Driver assistance graphics show Navigation Turn-by-Turn Alerts your vehicle, vehicle ahead, gap shown in the instrument cluster may setting, and lane status information. also be displayed in any HUD view. In addition to driver assistance graphics, pedestrian advisory and trailer sway indicators will be displayed.

English Shown, Metric Similar Speed View : This displays the speedometer reading in English or metric units, and speed limit. Some English Shown, Metric Similar information only appears on Off Road View : This displays the vehicles that have these features, speed view along with indicators for and when they are active. vehicle ahead, Lane Departure English Shown, Metric Similar Warning/Lane Keep Assist, trailer Navigation/Active OnStar View : sway, four-wheel drive status, and This displays the speed view along pedestrian advisory. Off-road with indicators for vehicle ahead, information such as pitch angle, Lane Departure Warning/Lane Keep steering angle, and rolling angle is Assist, trailer sway, and pedestrian also shown. advisory. Turn-by-Turn navigation information is shown during active Care of the HUD route. The compass heading is Clean the inside of the windshield to English Shown, Metric Similar displayed when navigation routing is remove any dirt or film that could Active Safety View : This displays not active. reduce the sharpness or clarity of the speed view along with a driver the HUD image. assistance graphic on the left. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 155 Clean the HUD lens with a soft cloth Vehicle Messages . Vehicle Security sprayed with glass cleaner. Wipe . Brakes the lens gently, then dry it. Messages displayed on the Driver Information Center (DIC) indicate . Steering HUD Troubleshooting the status of the vehicle or some . Ride Control Systems Check that: action that may be needed to correct a condition. Multiple . Driver Assistance Systems . Nothing is covering the messages may appear one after . Cruise Control HUD lens. another. . Lighting and Bulb Replacement . The HUD brightness setting is The messages that do not require not too dim or too bright. immediate action can be . Wiper/Washer Systems . The HUD is adjusted to the acknowledged and cleared by . Doors and Windows proper height. pressing the thumbwheel. The . Seat Belts messages that require immediate . Polarized sunglasses are . Airbag Systems not worn. action cannot be cleared until that action is performed. . Engine and Transmission . The windshield and HUD lens are clean. All messages should be taken . Tire Pressure seriously; clearing the message If the HUD image is not correct, does not correct the problem. . Battery contact your dealer. If a SERVICE message appears, Engine Power Messages The windshield is part of the HUD see your dealer. system. See Windshield ENGINE POWER IS REDUCED Replacement 0 365. Follow the instructions given in the messages. The system displays This message displays when the messages regarding the following vehicle's propulsion power is topics: reduced. A reduction in propulsion . Service Messages power can affect the vehicle's ability to accelerate. If this message is on, . Fluid Levels but there is no observed reduction GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

156 Instruments and Controls in performance, proceed to your Vehicle The menu may contain the destination. The performance may following: be reduced the next time the vehicle Personalization is driven. The vehicle may be driven Rear Seat Reminder The following are all possible while this message is on, but vehicle personalization features. This allows for a chime and a maximum acceleration and speed Depending on the vehicle, some message when the rear door has may be reduced. Anytime this may not be available. been opened before or during message stays on, or displays operation of the vehicle. repeatedly, the vehicle should be For System, Apps, and Personal Touch Off or On. taken to your dealer for service as features and functions, see soon as possible. “Settings” in the infotainment Climate and Air Quality manual. Under certain operating conditions, Touch and the following may propulsion will be disabled. Try To access the vehicle display: restarting after the vehicle has been personalization menu: . Auto Fan Speed off for 30 seconds. 1. Touch the Settings icon on the Home Page of the infotainment . Auto Defog Vehicle Speed Messages display. . Auto Rear Defog SPEED LIMITED TO 2. Touch Vehicle to display a list Auto Fan Speed XXX KM/H (MPH) of available options. This setting specifies the amount of This message shows that the 3. Touch to select the desired airflow when the climate control fan vehicle speed has been limited to feature setting. setting is Auto Fan. the speed displayed. The limited 4. Touch 9 or to turn a feature Touch Low, Medium, or High. speed is a protection for various R off or on. propulsion and vehicle systems, Auto Defog such as lubrication, thermal, brakes, 5. Touch z to go to the top level This setting automatically directs , Teen Driver if of the Settings menu. to the windshield to assist in equipped, or tires. defogging, based on temperature and humidity conditions. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 157 Touch Off or On. Touch Beeps or Safety Alert Seat. ahead of you starts moving again. See Adaptive Cruise Control (1500 Auto Rear Defog Forward Collision System Series) 0 245. This setting automatically turns the This setting controls the vehicle Touch Off or On. rear defogger on based on response when detecting a vehicle temperature and humidity ahead of you. The Off setting Lane Change Alert conditions. disables all FCA and AEB functions. This allows the feature to be turned Touch Off or On. With the Alert and Brake setting, on or off. See Lane Change Alert both FCA and AEB are available. (LCA) 0 274. Collision/Detection Systems The Alert setting disables AEB. See Automatic Emergency Braking Touch Off or On. Touch and the following may (AEB) 0 270. display: Park Assist Touch Off, Alert, or Alert and Brake. . Alert Type This allows the feature to be turned on or off. See Assistance Systems Forward Collision System Front Pedestrian Detection . for Parking or Backing 0 257. . Front Pedestrian Detection This feature may help avoid or reduce the harm caused by Select Off, On, or On with Towbar. . Adaptive Cruise Go Notifier front-end crashes with nearby Rear Camera Park Assist Symbols . Lane Change Alert pedestrians. See Front Pedestrian Braking (FPB) System (1500 Series) This setting enables the Rear . Park Assist 0 272. Camera Park Assist Symbols. See . Rear Camera Park Assist Assistance Systems for Parking or Touch Off, Alert, or Alert and Brake. 0 Symbols Backing 257. Adaptive Cruise Go Notifier . Rear Cross Traffic Alert Touch Off or On. This setting determines if an alert Alert Type will appear when Adaptive Cruise This feature sets the type of alert Control brings the vehicle to a from the driver assistance systems complete stop and the vehicle to help avoid crashes. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

158 Instruments and Controls Rear Cross Traffic Alert Touch Off, On - Driver and Exit Lighting This allows the Rear Cross Traffic Passenger, On - Driver, or On - This setting specifies how long the Alert feature to be turned on or off. Passenger. headlamps stay on after the vehicle See Assistance Systems for Parking Remote Mirror Folding is turned off and exited. or Backing 0 257. When on, the outside mirrors will Touch Off, 30 Seconds, 60 Seconds, Touch Off or On. remotely fold or unfold when the or 120 Seconds. Comfort and Convenience Remote Keyless Entry (RKE) Power Door Locks transmitter Q or K button is Touch and the following may pressed and held. See Folding Touch and the following may display: Mirrors 0 42. display: . Chime Volume Touch Off or On. . Open Door Anti Lock Out . Reverse Tilt Mirror . Auto Door Unlock Lighting . Remote Mirror Folding . Delayed Door Lock Touch and the following may Chime Volume display: Open Door Anti Lock Out This determines the chime volume . Vehicle Locator Lights This setting prevents the driver door level. from locking when the door is open. . Exit Lighting Touch the controls on the If this setting is on, the Delayed infotainment display to adjust the Vehicle Locator Lights Door Lock menu will not be available. volume. This setting flashes the vehicle’s Touch Off or On. Reverse Tilt Mirror headlamps when K is pressed on the Remote Keyless Entry (RKE) Auto Door Unlock This allows the feature to be turned transmitter. on or off. See Reverse Tilt Mirrors This setting allows selection of 0 44. Touch Off or On. which doors will automatically unlock when the vehicle is shifted into P (Park). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 159 Touch Off, All Doors, or Driver Door. Remote Lock Feedback cold days. See Heated and Ventilated Front Seats 0 60 and Delayed Door Lock This setting specifies how the 0 vehicle responds when the vehicle Remote Vehicle Start 25. This setting delays the locking of is locked with the RKE transmitter. If equipped with Auto Heated the vehicle’s doors. Touch Off, Lights and Horn, Lights Steering Wheel, this feature will turn Touch Off or On. Only, or Horn Only. on when the Remote Start Auto Heated Seats turn on. Remote Lock, Unlock, Start Remote Door Unlock Touch Off or On. Touch and the following may This setting specifies whether all display: doors, or just the driver door, unlock Remote Window Operation . Remote Unlock Light Feedback when pressing K on the RKE If equipped, this feature enables remote operation of the windows . Remote Lock Feedback transmitter. with the RKE transmitter. See . Remote Door Unlock Touch All Doors or Driver Door. Remote Keyless Entry (RKE) . Remote Start Auto Cool Seats Remote Start Auto Cool Seats System Operation (Key Access) 0 13 or . Remote Start Auto Heat Seats If equipped and turned on, this Remote Keyless Entry (RKE) feature will turn on the ventilated . Remote Window Operation System Operation (Keyless Access) seats when using remote start on 0 16. . Passive Door Unlock warm days. See Heated and Ventilated Front Seats 0 60 and Touch Off or On. . Passive Door Lock 0 Remote Vehicle Start 25. Passive Door Unlock . Remote Left in Vehicle Alert Touch Off or On. This allows the selection of what Remote Unlock Light Feedback Remote Start Auto Heat Seats doors will unlock when using the This setting flashes the exterior button on the driver door to unlock lamps when the vehicle is unlocked If equipped and turned on, this the vehicle. with the RKE transmitter. feature will turn on the heated seats when using remote start on Touch Off, All Doors, or Driver Touch Off or Flash Lights. Door Only. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

160 Instruments and Controls Passive Door Lock Seat Entry Memory Side Trailer Camera This allows passive locking to be This feature automatically recalls This feature specifies if using the turned on or off and selects the previously stored 1 or 2 button turn signal during a lane change will feedback. See Remote Keyless positions when the ignition is also display an applicable side view Entry (RKE) System Operation (Key changed from off to on or ACC/ of the trailer and vehicle. See Access) 0 13 or ACCESSORY. See Memory Seats Assistance Systems for Parking or Remote Keyless Entry (RKE) 0 58. Backing 0 257. System Operation (Keyless Access) Touch Off or On. Touch Off or On. 0 16. Touch Off, On with Horn Seat Exit Memory Bed View Camera Lighting Chirp, or On. This feature automatically recalls This feature specifies if the truck the previously stored exit button bed rail lights are turned on when Remote Left in Vehicle Alert positions when the ignition is the Bed View Camera is active. See This feature sounds an alert when changed from on or ACC/ Assistance Systems for Parking or the RKE transmitter is left in the ACCESSORY to off if the driver Backing 0 257. vehicle. This menu also enables door is open or opened. See Touch Off or On. Remote No Longer In Vehicle Alert. Memory Seats 0 58. Touch Off or On. Touch Off or On. Teen Driver See “Teen Driver” under “Settings” Seating Position Trailering in the infotainment manual. Touch and the following may Touch and the following may display: display: Valet Mode . Seat Entry Memory . Side Trailer Camera This will lock the infotainment system and steering wheel controls. . Seat Exit Memory . Bed View Camera Lighting It may also limit access to vehicle storage locations, if equipped. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 161 To enable valet mode: Universal Remote instructions refer to a garage door 1. Enter a four-digit code on the opener, but can be used for other keypad. System devices. See Radio Frequency Statement Do not use the Universal Remote 2. Select Enter to go to the 0 confirmation screen. 472. system with any garage door opener that does not have the stop and 3. Re-enter the four-digit code. Universal Remote System reverse feature. This includes any Touch Lock or Unlock to lock or Programming garage door opener model unlock the system. Touch Back to manufactured before April 1, 1982. go back to the previous menu. Read the instructions completely before programming the Universal Remote system. It may help to have another person assist with the programming process. Keep the original hand-held transmitter for use in other vehicles as well as for future programming. Erase the programming when vehicle ownership is terminated. See “Erasing Universal Remote System Buttons” later in this If equipped, these buttons are in the section. overhead console. To program a garage door opener, This system can replace up to three park outside directly in line with and remote control transmitters used to facing the garage door opener activate devices such as garage receiver. Clear all people and door openers, security systems, and objects near the garage door. home automation devices. These GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

162 Instruments and Controls Make sure the hand-held transmitter 2. At the same time, press and . If the indicator light does has a new battery for quick and hold both the hand-held not come on or the garage accurate transmission of the transmitter button and one of door does not move, a radio-frequency signal. the three Universal Remote second button press may system buttons to be used to be required. For a second Programming the Universal operate the garage door. Do time, press and hold the Remote System not release either button until newly programmed button For questions or programming help, the indicator light goes from a for five seconds. If the light see www.homelink.com/gm or call slow to a rapid flashing light. stays on or the garage door 1-800-355-3515. For calls placed Then release both buttons. moves, programming is outside the U.S., Canada, or Puerto Some garage door openers complete. Rico, international rates will apply may require substitution of . If the indicator light blinks and may differ based on landline or Step 2 with the procedure rapidly for two seconds, mobile phone. under “Radio Signals for Some then changes to a solid light Programming involves Gate Operators” later in this and the garage door does time-sensitive actions, and may time section. not move, continue with out causing the procedure to be 3. Press and hold the newly programming Steps 4–6. repeated. programmed Universal Remote To program up to three devices: system button for five seconds while watching the indicator 1. Hold the end of the hand-held light and garage door transmitter about 3 to 8 cm activation. (1 to 3 in) away from the Universal Remote system . If the indicator light stays on buttons with the indicator light continuously or the garage in view. The hand-held door moves when the transmitter was supplied by the button is pressed, then manufacturer of the garage programming is complete. door opener receiver. There is no need to complete Steps 4–6. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Instruments and Controls 163 press and hold the same This may not be long enough for the button a second time for Universal Remote system to pick up two seconds, then release it. the signal during programming. Again, if the door does not If the programming did not work, move or the garage door lamp replace Step 2 under “Programming does not flash, press and hold the Universal Remote System” with the same button a third time for the following: two seconds, then release it. Press and hold the Universal The Universal Remote system Learn or Smart Button Remote system button while should now activate the pressing and releasing the 4. After completing Steps 1 3, – garage door. hand-held transmitter button every locate the Learn or Smart Repeat the process for two seconds until the signal has button inside the garage on the programming the two remaining been successfully accepted by the garage door opener receiver. buttons. Universal Remote system. The The name and color of the Universal Remote system indicator button may vary by Radio Signals for Some Gate light will flash slowly at first and then manufacturer. Operators rapidly. Proceed with Step 3 under 5. Press and release the Learn or For questions or programming help, “Programming the Universal Remote Smart button. Step 6 must be see www.homelink.com/gm or call System” to complete. completed within 30 seconds of 1-800-355-3515. For calls placed pressing this button. outside the U.S., Canada, or Puerto 6. Inside the vehicle, press and Rico, international rates will apply hold the newly programmed and may differ based on landline or Universal Remote system mobile phone. button for two seconds and Some radio–frequency laws and then release it. If the garage gate operators require transmitter door does not move or the signals to time out or quit after lamp on the garage door several seconds of transmission. opener receiver does not flash, GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

164 Instruments and Controls Universal Remote System Reprogramming a Single Operation Universal Remote System Button Using the Universal Remote To reprogram any of the system System buttons: Press and hold the appropriate 1. Press and hold any one of the Universal Remote system button for buttons. Do not release the at least one-half second. The button. indicator light will come on while the signal is being transmitted. 2. The indicator light will begin to flash after 20 seconds. Without Erasing Universal Remote releasing the button, proceed System Buttons with Step 1 under Erase all programmed buttons when “Programming the Universal vehicle ownership is terminated. Remote System.” To erase: 1. Press and hold the two outside buttons until the indicator light begins to flash. This should take about 10 seconds. 2. Release both buttons. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Lighting 165 Lighting Features Exterior Lighting Lighting Entry Lighting ...... 173 Exit Lighting ...... 173 Exterior Lamp Controls Exterior Lighting Battery Load Management . . . 174 Battery Power Protection . . . . . 174 Exterior Lamp Controls ...... 165 Exterior Lighting Battery Exterior Lamps Off Saver ...... 174 Reminder ...... 167 Headlamp High/Low-Beam Changer ...... 167 Flash-to-Pass ...... 168 Daytime Running Lamps (DRL) ...... 168 Automatic Headlamp System ...... 168 Hazard Warning Flashers . . . . . 169 Turn and Lane-Change Signals ...... 170 Fog Lamps ...... 170 The exterior lamp control is on the Task Lighting ...... 171 instrument panel to the left of the Exterior Cargo Lamps ...... 171 steering wheel. Interior Lighting O : Turns off the automatic Instrument Panel Illumination headlamps and Daytime Running Control ...... 172 Lamps (DRL). Turn the headlamp Dome Lamps ...... 172 control to O again to turn the Reading Lamps ...... 173 automatic headlamps or DRL back on. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

166 Lighting For vehicles first sold in Canada, off turned on while the vehicle is off, Turning On and Enabling will only work when the vehicle is in the headlamps will stay on for IntelliBeam P (Park). 10 minutes before turning off to AUTO : Automatically turns on the prevent the battery from being headlamps, parking lamps, drained. Turn the headlamp control taillamps, instrument panel lights, off and then back to the headlamp roof marker lamps (if equipped), on position to make the headlamps front/rear sidemarker lamps, and stay on for an additional 10 minutes. license plate lamps. To keep the lamps on for more than 10 minutes, the ignition must be on ; : Turns on the parking lamps or in ACC/ACCESSORY. including all lamps, except the K headlamps and fog lamps, : If equipped, turns on the task lighting. See Task Lighting 0 171. To enable the IntelliBeam system, if equipped. press the button on the end of the 2 : Turns on the headlamps IntelliBeam System turn signal lever when the exterior together with the parking lamps, If equipped, this system turns the lamp control is in the AUTO or 2 taillamps, instrument panel lights, vehicle's high-beam headlamps on position. The blue high-beam on roof marker lamps (if equipped), and off according to surrounding light appears on the instrument front/rear sidemarker lamps, and traffic conditions. cluster when the high beams are on. license plate lamps. The system turns the high-beam Driving with IntelliBeam For some trim levels and series of headlamps on when it is dark The system only activates the high trucks first sold in Canada, the enough and there is no other traffic beams when driving over 40 km/h headlamps may turn on with the present. parking lamps." (25 mph). This light b comes on in the When the headlamps are turned on There is a sensor near the top instrument cluster when the while the vehicle is on, the center of the windshield that IntelliBeam system is enabled. headlamps turn off automatically automatically controls the system. 10 minutes after the ignition is turned off. When the headlamps are GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Lighting 167 Keep this area of the windshield reactivated. See Headlamp . The vehicle is loaded such that clear of debris to allow for best High/Low-Beam Changer 0 167 the front end points upward, system performance. and causing the light sensor to aim 0 The high-beam headlamps remain Flash-to-Pass 168. high and not detect headlamps on, under the automatic control, The high beams may not turn off and taillamps. until one of the following situations automatically if the system cannot . Driving on winding or hilly roads. occurs: detect another vehicle's lamps The automatic high-beam . The system detects an because of any of the following: headlamps may need to be disabled approaching vehicle's . The other vehicle's lamps are if any of the above conditions exist. headlamps. missing, damaged, obstructed . The system detects a preceding from view, or otherwise Exterior Lamps Off vehicle's taillamps. undetected. Reminder . The other vehicle's lamps are . The outside light is bright A reminder chime sounds when the covered with dirt, snow, and/or enough that high-beam headlamps or parking lamps are road spray. headlamps are not required. manually turned on, the ignition is . The vehicle's speed drops below . The other vehicle's lamps cannot off, and a door is open. To disable 20 km/h (12 mph). be detected due to dense the chime, turn the lamps off. exhaust, smoke, fog, snow, road . The IntelliBeam system is spray, mist, or other airborne Headlamp High/ disabled by the button on the obstructions. turn signal lever. If this happens, Low-Beam Changer . The vehicle's windshield is dirty, press the button on the end of Push the turn signal lever toward the turn signal lever when the cracked, or obstructed by something that blocks the view the instrument panel to change the exterior lamp control is in the headlamps from low to high beam. 2 of the light sensor. AUTO or position. The Pull or push the turn signal lever to instrument cluster light will come return to low-beam headlamps. on to indicate the IntelliBeam is GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

168 Lighting instrument cluster will come on. When it begins to get dark, the Release the lever to return to automatic headlamp system normal operation. switches from DRL to the headlamps. Daytime Running To turn off the DRL, turn the exterior Lamps (DRL) lamp control to O and then release. When the high-beam headlamps are DRL can make it easier for others to For vehicles first sold in Canada, off on, this indicator light on the will only work when the vehicle is instrument cluster will also be on. see the front of the vehicle during the day. Fully functional DRL are parked. required on all vehicles first sold in Flash-to-Pass Canada. Automatic Headlamp This feature lets you use the The DRL system comes on when System high-beam headlamps to signal a the following conditions are met: driver in front of you that you want When the exterior lamp control is to pass. It works even if the . The ignition is on. set to AUTO and it is dark enough headlamps are in the automatic outside, the headlamps come on . The exterior lamp control is automatically. position. in AUTO. To use it, pull the turn signal lever . The transmission is not in toward you, then release it. P (Park). If the headlamps are in the . The light sensor determines it is automatic position or on low beam, daytime. the high-beam headlamps will turn on. Depending on the type of When the DRL system is on, only headlamp, they will either turn off the DRL are on. The taillamps, after a short duration or stay on as sidemarker lamps, instrument panel long as you hold the lever toward lights, and other lamps will not you. The high-beam indicator on the be on. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Lighting 169 cluster may not be as bright as Hazard Warning Flashers usual. Make sure the instrument panel illumination control is in the full bright position. See Instrument Panel Illumination Control 0 172. When it is bright enough outside, the headlamps will turn off or may change to DRL. The automatic headlamp system turns off when the exterior lamp control is turned to O or the ignition There is a light sensor on top of the is off. instrument panel. Do not cover the Lights On with Wipers sensor, otherwise the headlamps will come on when they are not If the windshield wipers are | : Press this button to make the needed. activated in daylight with the engine front and rear turn signal lamps on, and the exterior lamp control is The system may also turn on the flash on and off. Press again to turn in AUTO, the headlamps, parking the flashers off. headlamps when driving through a lamps, and other exterior lamps parking garage or tunnel. come on. The transition time for the When the hazard warning flashers If the vehicle is started in a dark lamps coming on varies based on are on, the vehicle's turn signals will garage, the automatic headlamp wiper speed. When the wipers are not work. system comes on immediately. If it not operating, these lamps turn off. is light outside when the vehicle Move the exterior lamp control to O leaves the garage, there is a slight or ; to disable this feature. delay before the automatic headlamp system changes to the Daytime Running Lamps (DRL). During that delay, the instrument GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

170 Lighting Turn and Lane-Change The lever returns to its starting Fog Lamps Signals position whenever it is released. If after signaling a turn or a lane change the arrows flash rapidly or do not come on, a signal bulb could be burned out. If equipped with LED turn signals, see your dealer. Replace any burned out bulbs. If a bulb is not burned out, check the fuse. See Fuses and Circuit Breakers 0 370.

An arrow on the instrument cluster Turn Signal On Chime flashes in the direction of the turn or If the turn signal is left on for more lane change. than 1.2 km (0.75 mi), a chime If equipped, the fog lamp control is Move the turn signal lever all the sounds at each flash of the turn near the exterior lamp control to the way up or down to signal a turn. signal. A message may appear in left of the steering column. the Driver Information Center (DIC). The ignition must be on for the fog Partially raise or lower the lever for See Vehicle Messages 0 155. To lamps to come on. less than one second until the arrow turn the chime and message off, starts to flash to signal a lane move the turn signal lever to the off # : Press to turn the fog lamps on change. This causes the turn position. or off. A light will come on in the signals to automatically flash three instrument cluster. times. It will flash six times if Tow/ When the fog lamps are turned on, Haul Mode is active. Holding the the parking lamps automatically turn signal lever for more than turn on. one second will cause the turn signals to flash until the lever is released. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Lighting 171 When the headlamps are changed While the vehicle is parked, Exterior Cargo Lamps to high beam, the fog lamps also go press K to select one of the off. When the high-beam headlamps following options: are turned off, the fog lamps will come on again. . Left and Right Task Lights Illuminated Some localities have laws that require the headlamps to be on with . Left Task Light Illuminated the fog lamps. . Right Task Light Illuminated Task Lighting . Left and Right Task Lights Off If the vehicle leaves a parked position, the lights will immediately turn off. If the vehicle is off, the lights will stay on for approximately The cargo lamps provide more light 10 minutes. in the cargo area or on the sides of If any Task lights are on, if the the vehicle, if needed. The lamps button has not been pressed after inside the pickup box, in the tailgate approximately 5 seconds, pressing handle, for the hitch, and/or the it again will turn off all Task Lights. cargo mirror lamps also turn on, if equipped.

If equipped, task lighting projects light from the outside mirrors away from the vehicle. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

172 Lighting If the vehicle is in P (Park), Interior Lighting Dome Lamps R (Reverse), or N (Neutral) the Cargo Lamp Switch causes the lights to cycle through the following Instrument Panel states for each button press: Illumination Control - Initial Press: - CHMSL/Cargo Bed Lights - On - Cargo Mirror Lights - On - Cargo Switch Indicator (if equipped) - On - Next Press: (if with in 5 seconds of the previous button press): - CHMSL/Cargo Bed Lights - On The dome lamp controls are in the - Cargo Mirror Lights - Off overhead console. - Cargo Switch Indicator (if To operate, press the following equipped) - On This feature controls the brightness buttons: - Next Press: of the steering wheel and instrument j OFF : Press to turn off the panel lights. The instrument panel dome lamps when a door is open. - CHMSL/Cargo Bed Lights - Off illumination control is next to the An indicator light on the button will - Cargo Mirror Lights - Off exterior lamp control. turn on when the dome lamp - Cargo Switch Indicator (if D : Press D + to brighten or D − override is activated. Press j equipped) - Off to dim the lights. OFF again to deactivate this feature Become familiar with and follow all and the indicator light will turn off. state and local laws that apply to The dome lamps will come on when cargo lamp operation. doors are opened. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Lighting 173 + ON/OFF : Press to turn the dome Lighting Features lamps on manually. Press again to turn the dome lamps off. Entry Lighting Reading Lamps Some exterior lamps and the interior lamps turn on briefly at night, or in There are reading lamps on the overhead console and over the rear areas with limited lighting, when K seats. These lamps come on when is pressed on the Remote Keyless Entry (RKE) transmitter. When a any door is opened. Rear Reading Lamps door is opened, the interior lamps The rear reading lamps are over the come on. After about 30 seconds rear seats. the exterior lamps turn off. Entry Press the lamp lens to turn the rear lighting can be disabled manually by reading lamps on or off. changing the ignition out of the OFF position, or by pressing the RKE transmitter Q button. This feature can be changed. See “Vehicle Locator Lights” under Vehicle Personalization 0 156. Exit Lighting Front Reading Lamps Some exterior lamps and interior The front reading lamps are in the lights come on at night, or in areas overhead console. with limited lighting, when the driver Press the lamp lenses to turn the door is opened after the ignition is front reading lamps on or off. turned off. The dome lamp comes on after the ignition is turned off. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

174 Lighting The exterior lamps and dome lamp moving up or down. This is normal. Normally, these actions occur in remain on for a set amount of time, If there is a problem, an alert will be steps or levels, without being then automatically turn off. displayed. noticeable. In rare cases at the The exterior lamps turn off The battery can be discharged at highest levels of corrective action, immediately by turning the exterior idle if the electrical loads are very this action may be noticeable to the lamp control off. high. This is true for all vehicles. driver. If so, a DIC message might This is because the generator be displayed and it is recommended This feature can be changed. See that the driver reduce the electrical Vehicle Personalization 0 156. (alternator) may not be spinning fast enough at idle to produce all the loads as much as possible. power that is needed for very high Battery Load electrical loads. Battery Power Protection Management A high electrical load occurs when This feature shuts off the dome and The vehicle has Electric Power several of the following are on, such reading lamps, if they are left on for Management (EPM), which as: headlamps, high beams, fog more than 10 minutes after the estimates the battery's temperature lamps, rear window defogger, ignition is turned off. The cargo and state of charge. It then adjusts climate control fan at high speed, lamp shuts off after 20 minutes. This the voltage for best performance heated seats, engine cooling fans, prevents the battery from and extended life of the battery. trailer loads, and loads plugged into running down. When the battery's state of charge accessory power outlets. is low, the voltage is raised slightly EPM works to prevent excessive Exterior Lighting Battery to quickly bring the charge back up. discharge of the battery. It does this Saver When the state of charge is high, by balancing the generator's output The exterior lamps turn off about the voltage is lowered slightly to and the vehicle's electrical needs. 10 minutes after the ignition is prevent overcharging. The voltmeter It can increase engine idle speed to turned off, if the parking lamps or gauge or the voltage display on the generate more power, whenever headlamps have been manually left Driver Information Center (DIC), needed. It can temporarily reduce on. This protects against draining if equipped, may show the voltage the power demands of some the battery. To restart the 10-minute accessories. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Lighting 175 timer, turn the exterior lamp control to the O position and then back to the ; or 2 position. To keep the lamps on for more than 10 minutes, the ignition must be on or in ACC/ACCESSORY. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

176 Infotainment System Infotainment Introduction System Infotainment See the infotainment manual for Introduction information on the radio, audio Infotainment ...... 176 players, phone, navigation system, and voice or speech recognition. It also includes information on settings. Active Noise Cancellation (ANC) If equipped, ANC reduces engine noise in the vehicle’s interior. ANC requires the factory-installed audio system, radio, speakers, amplifier (if equipped), induction system, and exhaust system to work properly. Deactivation is required by your dealer if related aftermarket equipment is installed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Climate Controls 177 Climate Controls Climate Control Systems

The heating, cooling, and ventilation in the vehicle can be controlled with this Climate Control Systems system. Climate Control Systems . . . . . 177 Dual Automatic Climate Control System ...... 179 Air Vents Air Vents ...... 182 Maintenance Passenger Compartment Air Filter ...... 183 Service ...... 184

1. Fan Control 9 : Turn clockwise or 2. MAX Defrost counterclockwise to increase or decrease the fan speed. Turn the 3. Air Delivery Mode Controls knob all the way counterclockwise 4. A/C (Air Conditioning) to turn the fan off. 5. TEMP (Temperature Control) TEMP : Turn clockwise or counterclockwise to increase or 6. Recirculation decrease the temperature inside the 7. Rear Window Defogger (If vehicle. Equipped) or Heated Mirrors (If Equipped) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

178 Climate Controls Air Delivery Mode Controls : the control is pressed again, the Rear Window Defogger system returns to the previous mode Press z, Y, or [ to change the 1 REAR : If equipped, press to setting and fan speed. direction of the airflow. Any turn the rear window defogger on or combination of the three controls For best results, clear all snow and off. An indicator light on the button ice from the windshield before can be selected. An indicator light comes on to show that the rear defrosting. window defogger is on. comes on in the selected mode button. @ : Press to turn on recirculation. The rear window defogger only An indicator light comes on. Air is works when the engine is running. To change the current mode, select recirculated to quickly cool the The defogger turns off if the ignition one or more of the following. An inside of the vehicle. It can also be is turned off or to ACC/ indicator light will illuminate: used to help reduce outside air and ACCESSORY. odors that enter the vehicle. z : Air is directed to the If equipped with heated outside windshield, outboard a/c outlets, Avoid using recirculation for long mirrors, press f to turn them on or and side window outlets. periods of time in cold or damp off. See Heated Mirrors 0 43. Y : Air is directed to the a/c outlets. conditions. Using recirculation in cold or damp conditions can result [ : Air is directed to the floor in window fogging. Caution outlets, with some air directed to the windshield, outboard a/c outlets, A/C : Press to turn the air Using a razor blade or sharp and side window outlets. conditioning on or off. An indicator object to clear the inside rear light comes on to show that the air window can damage the rear 0 MAX : Air is directed to the conditioning is enabled. If the fan is window defogger. Repairs would windshield and the fan runs at a turned off, the air conditioner will not not be covered by the vehicle higher speed if not already above a run. The A/C light will stay on even warranty. Do not clear the inside medium fan speed. This mode if the outside temperatures are rear window with sharp objects. overrides the previous mode below freezing. selected and clears fog or frost from the windshield more quickly. When GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Climate Controls 179 Dual Automatic Climate Control System Climate Control Display The heating, cooling, and ventilation in the vehicle can be controlled with this system.

1. Driver and Passenger Temperature Settings 2. Fan Control 1. Driver and Passenger 6. Recirculation 3. Driver and Passenger Temperature Controls 7. Power Button Temperature Controls 2. MAX Defrost 8. Fan Control 4. Sync (Synchronized Temperature) 3. Air Delivery Mode Controls 9. Rear Window Defogger (If 4. A/C (Air Conditioning) Equipped) or Heated Mirrors (If 5. Recirculation 5. SYNC (Synchronized Equipped) 6. Air Delivery Mode Controls Temperature) 10. AUTO (Automatic Operation) 7. Auto (Automatic Operation) 8. A/C (Air Conditioning) 9. On/Off (Power) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

180 Climate Controls The fan, air delivery mode, air Automatic Operation The recirculation light will not come conditioning, driver and passenger The system automatically controls on when automatically controlled. temperatures, and Sync settings the fan speed, air delivery, air See @ under “Manual Operation” can be controlled by touching conditioning, and recirculation in for more details. CLIMATE on the infotainment Home order to heat or cool the vehicle to Manual Operation Page or the climate button in the the desired temperature. climate control display application : Turn clockwise or When AUTO is lit, all four functions 9 tray. A selection can then be made counterclockwise to increase or operate automatically. Each function on the front climate control page decrease the fan speed. Press the can also be manually set and the displayed. See the infotainment knob to turn the fan off. When off is selected setting is displayed. manual. selected, a small amount of air may Functions not manually set will still come out of the outlets Climate Control Status Display continue to be automatically depending on vehicle speed. If any controlled, even if the AUTO buttons are pressed or knobs are indicator is not lit. turned, the climate control system For automatic operation: will turn on and operate at the 1. Press AUTO. current setting. 2. Set the temperature. Allow the Press AUTO to return to automatic system time to stabilize. Adjust operation. the temperature as needed for Driver and Passenger best comfort. Temperature Control : The To improve fuel efficiency and to temperature can be adjusted cool the vehicle faster, recirculation separately for the driver and may be automatically selected in passenger. warm weather. Turn the knob clockwise or The climate control status display counterclockwise to increase or appears briefly when the center decrease the driver or passenger stack climate controls are adjusted. temperature setting. The driver side GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Climate Controls 181 or passenger side temperature Y : Air is directed to the a/c outlets. Avoid using recirculation for long display shows the temperature [ periods of time in cold or damp setting increasing or decreasing. : Air is directed to the floor conditions. Using recirculation in outlets, with some air directed to the SYNC : Press to link the passenger cold or damp conditions can result windshield, outboard a/c outlets, in window fogging. temperature setting to the driver and side window outlets. setting. The SYNC indicator light will A/C : Press to turn the air turn on. When the passenger setting 0 MAX : Air is directed to the conditioning on or off. An indicator is adjusted, the SYNC indicator light windshield and the fan runs at a light comes on to show that the air will turn off. higher speed if not already above a conditioning is enabled. If the fan is medium fan speed. This mode turned off, the air conditioner will not Air Delivery Mode Control : Press overrides the previous mode Y [ run. The A/C light will stay on even z, , or to change the selected and clears fog or frost from if the outside temperatures are direction of the airflow. Any the windshield more quickly. When below freezing. combination of the three controls the control is pressed again, the system returns to the previous mode Rear Window Defogger can be selected. An indicator light setting and fan speed. 1 comes on in the selected mode REAR : If equipped, press to For best results, clear all snow and turn the rear window defogger on or button. ice from the windshield before off. An indicator light on the button Changing the mode cancels the defrosting. comes on to show that the rear automatic operation and the system @ : Press to turn on recirculation. window defogger is on. goes into manual mode. Press An indicator light comes on. Air is The rear window defogger only AUTO to return to automatic recirculated to quickly cool the works when the engine is running. operation. inside of the vehicle. It can also be The defogger turns off if the ignition To change the current mode, select used to help reduce outside air and is turned off or to ACC/ one or more of the following: odors that enter the vehicle. ACCESSORY. z : Air is directed to the If equipped with heated outside windshield, outboard a/c outlets, mirrors, press f to turn them on or and side window outlets. off. See Heated Mirrors 0 43. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

182 Climate Controls Sensors Caution Air Vents Use the sliding knobs on the center Using a razor blade or sharp and side air vents to change the object to clear the inside rear direction of the airflow. window can damage the rear window defogger. Repairs would Air vents blow warm air on the side not be covered by the vehicle windows in cold weather. If Floor, Defog, or Defrost modes are warranty. Do not clear the inside selected, a small amount of air will rear window with sharp objects. come from the vents close to the window. The solar sensor, on top of the Remote Start Climate Control To close the front a/c vents, move instrument panel near the Operation : If equipped with remote the sliding knobs to the full down windshield, monitors the solar heat. start, the climate control system position. may run when the vehicle is started The climate control system uses the To close the rear a/c vents, move remotely. If equipped with heated or sensor information to adjust the the sliding knobs to the full inboard ventilated seats or a heated steering temperature, fan speed, position. wheel, these features may come on recirculation, and air delivery mode during a remote start. See Remote for best comfort. Operation Tips Vehicle Start 0 25, Heated and Ventilated Front Seats 0 60, and Do not cover the sensor; otherwise . Clear away any ice, snow, Heated Steering Wheel 0 119. the automatic climate control system or leaves from air inlets at the may not work properly. base of the windshield that could block the flow of air into the vehicle. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Climate Controls 183 . Clear snow off the hood to Maintenance 1. Open the lower glove box door improve visibility and help completely. decrease moisture drawn into the vehicle. Passenger Compartment . Keep the path under the front Air Filter seats clear of objects to help The filter reduces the dust, pollen, circulate the air inside of the and other airborne irritants from vehicle more effectively. outside air that is pulled into the . Use of non-GM approved hood vehicle. deflectors can adversely affect The filter should be replaced as part the performance of the system. of routine scheduled maintenance. Check with your dealer before See Maintenance Schedule 0 441. adding equipment to the outside To find out what type of filter to use, of the vehicle. see Maintenance Replacement Parts 0 454. 2. Push the dampener arm to the left until it releases the glovebox. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

184 Climate Controls 4. Pull lever on left side of the During service, all refrigerants filter door and slide left, then should be reclaimed with proper remove the door. Remove the equipment. Venting refrigerants old filter. directly to the atmosphere is harmful 5. Install the new air filter. to the environment and may also create unsafe conditions based on 6. Reinstall the filter door. inhalation, combustion, frostbite, 7. Reverse the steps to reinstall or other health-based concerns. the glove box. The air conditioning system requires See your dealer if additional periodic maintenance. See 0 assistance is needed. Maintenance Schedule 441. 3. Press the sides of the glove Service box door inward and rotate the door downward to remove. All vehicles have a label underhood that identifies the refrigerant used in the vehicle. The refrigerant system should only be serviced by trained and certified technicians. The air conditioning evaporator should never be repaired or replaced by one from a salvage vehicle. It should only be replaced by a new evaporator to ensure proper and safe operation. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 185 Ignition Positions (Key Brake Assist ...... 234 Driving and Access) ...... 210 Hill Start Assist (HSA) ...... 235 Operating Starting the Engine ...... 212 Stop/Start System ...... 213 Ride Control Systems Engine Heater ...... 215 Traction Control/Electronic Stability Control ...... 235 Driving Information Retained Accessory Power (RAP) ...... 216 Hill Descent Control (HDC) . . . 237 Driving for Better Fuel Driver Mode Control ...... 238 Economy ...... 186 Shifting Into Park ...... 217 Shifting out of Park ...... 218 Limited-Slip Differential ...... 242 Distracted Driving ...... 187 Locking Rear ...... 242 Defensive Driving ...... 187 Parking over Things Drunk Driving ...... 188 That Burn ...... 219 Cruise Control Control of a Vehicle ...... 188 Active Fuel Management . . . . . 219 Cruise Control ...... 243 Braking ...... 188 Extended Parking ...... 219 Adaptive Cruise Control (1500 Steering ...... 188 Engine Exhaust Series) ...... 245 Off-Road Recovery ...... 190 Engine Exhaust ...... 220 Loss of Control ...... 190 Driver Assistance Systems Running the Vehicle While Driver Assistance Systems . . . 255 Off-Road Driving ...... 191 Parked ...... 220 Driving on Wet Roads ...... 196 Assistance Systems for Hill and Mountain Roads . . . . . 197 Parking or Backing ...... 257 Winter Driving ...... 197 Automatic Transmission ...... 221 Assistance Systems for If the Vehicle Is Stuck ...... 199 Manual Mode ...... 224 Driving ...... 268 Vehicle Load Limits ...... 200 Tow/Haul Mode ...... 227 Forward Collision Alert (FCA) Truck-Camper Loading System ...... 268 Information ...... 206 Drive Systems Automatic Emergency Four-Wheel Drive ...... 227 Braking (AEB) ...... 270 Starting and Operating Front Pedestrian Braking New Vehicle Break-In ...... 208 Brakes (FPB) System (1500 Ignition Positions (Keyless Electric Brake Boost ...... 232 Series) ...... 272 Access) ...... 208 Antilock Brake Side Blind Zone System (ABS) ...... 232 Alert (SBZA) ...... 274 Electric Parking Brake ...... 233 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

186 Driving and Operating Lane Change Alert (LCA) . . . . . 274 Trailer Sway Control (TSC) . . . 308 Driving Information Lane Departure Warning Trailering App ...... 310 (LDW) (2500/3500 Series) ...... 276 Conversions and Add-Ons Driving for Better Fuel Lane Keep Assist (LKA) (1500 Add-On Electrical Economy Series) ...... 278 Equipment ...... 322 Adding a Snow Plow or Similar Driving habits can affect fuel Fuel Equipment ...... 323 mileage. Here are some driving tips Top Tier Fuel ...... 280 Pickup Conversion to to get the best fuel economy Recommended Fuel (Except Chassis Cab ...... 326 possible: 6.2L V8 Engine) ...... 280 . Set the climate controls to the Recommended Fuel (6.2L desired temperature after the V8 Engine) ...... 281 engine is started, or turn them Prohibited ...... 281 off when not required. Fuels in Foreign Countries . . . 281 Fuel Additives ...... 282 . Avoid fast starts and accelerate or FlexFuel ...... 282 smoothly. Filling the Tank (Pickup . Brake gradually and avoid Model) ...... 283 abrupt stops. Filling the Tank (Chassis Cab Model) ...... 285 . Avoid idling the engine for long Filling a Portable Fuel periods of time. Container ...... 286 . When road and weather Trailer Towing conditions are appropriate, use cruise control. General Towing Information ...... 287 . Always follow posted speed Driving Characteristics and limits or drive more slowly when Towing Tips ...... 287 conditions require. Trailer Towing ...... 292 . Keep vehicle tires properly Towing Equipment ...... 296 inflated. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 187 . Combine several trips into a . Do not use a phone in . Avoid stressful conversations single trip. demanding driving situations. while driving, whether with a . Replace the vehicle's tires with Use a hands-free method to passenger or on a cell phone. the same TPC Spec number place or receive necessary molded into the tire's sidewall phone calls. { Warning near the size. . Watch the road. Do not read, take notes, or look up Taking your eyes off the road too . Follow recommended scheduled long or too often could cause a maintenance. information on phones or other electronic devices. crash resulting in injury or death. Focus your attention on driving. Distracted Driving . Designate a front seat passenger to handle potential Distraction comes in many forms distractions. Refer to the infotainment manual for and can take your focus from the more information on using that . Become familiar with vehicle task of driving. Exercise good system and the navigation system, features before driving, such as judgment and do not let other if equipped, including pairing and programming favorite radio activities divert your attention away using a cell phone. from the road. Many local stations and adjusting climate governments have enacted laws control and seat settings. Defensive Driving regarding driver distraction. Become Program all trip information into familiar with the local laws in any navigation device prior to Defensive driving means “always your area. driving. expect the unexpected.” The first step in driving defensively is to wear To avoid distracted driving, keep . Wait until the vehicle is parked the seat belt. See Seat Belts 0 64. your eyes on the road, keep your to retrieve items that have fallen hands on the steering wheel, and to the floor. . Assume that other road users focus your attention on driving. . Stop or park the vehicle to tend (pedestrians, bicyclists, and to children. other drivers) are going to be careless and make mistakes. . Keep pets in an appropriate Anticipate what they may do and carrier or restraint. be ready. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

188 Driving and Operating . Allow enough following distance Control of a Vehicle If the engine ever stops or a brake between you and the driver in fault occurs, the brakes may lose front of you. Braking, steering, and accelerating power assist. More effort will be are important factors in helping to . Focus on the task of driving. required to stop the vehicle. It may control a vehicle while driving. take longer to stop. Drunk Driving Braking Steering Death and injury associated with Braking action involves perception drinking and driving is a global time and reaction time. Deciding to Caution tragedy. push the brake pedal is perception time. Actually doing it is To avoid damage to the steering { Warning reaction time. system, do not drive over curbs, Average driver reaction time is parking barriers, or similar objects Drinking and then driving is very at speeds greater than 3 km/h dangerous. Your reflexes, about three-quarters of a second. In that time, a vehicle moving at (1 mph). Use care when driving perceptions, attentiveness, and 100 km/h (60 mph) travels 20 m over other objects such as lane judgment can be affected by even (66 ft), which could be a lot of dividers and speed bumps. a small amount of alcohol. You distance in an emergency. Damage caused by misuse of the can have a serious — or even vehicle is not covered by the Helpful braking tips to keep in mind fatal — collision if you drive after vehicle warranty. drinking. include: Do not drink and drive or ride with . Keep enough distance between a driver who has been drinking. you and the vehicle in front Ride home in a cab; or if you are of you. with a group, designate a driver . Avoid needless heavy braking. who will not drink. . Keep pace with traffic. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 189 If the steering wheel is turned until it (2500/3500 Series - Double Cab/ reaches the end of its travel, and is Crew Cab with Digital Steer held in that position for an extended Assist) period of time, assist The vehicle has a Digital Steer may be reduced. Assist power steering system that Normal use of the power steering varies the amount of effort required assist should return when the to steer the vehicle. Less steering system cools down. effort is required at slower speeds. At faster speeds, the required See your dealer if there is a steering effort increases. The problem. system helps the steering wheel Power Steering (2500/3500 return to center at low speeds. Electric Power Steering (1500 Series) Pressing the Tow/Haul button Series) adjusts steering effort for driving (2500/3500 Series - All Regular conditions described in Tow/Haul This vehicle has electric power Cab, Double Cab/Crew Cab Mode 0 227. steering. It does not have power without Digital Steer Assist) steering fluid. Regular maintenance The power steering system may The power steering system may is not required. require maintenance. See Power require maintenance. See Power Steering Fluid 0 354. If power steering assist is lost due Steering Fluid 0 354. to a system malfunction, the vehicle If power steering assist is lost If power steering assist is lost can be steered, but may require because the engine stops or the because the engine stops or the increased effort. system malfunctions, the vehicle system malfunctions, the vehicle can be steered but may require See your dealer if there is a can be steered but may require increased effort. See your dealer. problem. increased effort. See your dealer. If the steering assist is used for an extended period of time while the vehicle is not moving, power assist may be reduced. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

190 Driving and Operating . Holding both sides of the 1. Ease off the accelerator and Caution steering wheel allows you to turn then, if there is nothing in the 180 degrees without removing way, steer the vehicle so that it Do not hold the steering wheel at a hand. straddles the edge of the full rotation for more than pavement. 15 seconds and/or at an elevated . Antilock Brake System (ABS) RPM. Damage may occur to the allows steering while braking. 2. Turn the steering wheel about power steering system and there one-eighth of a turn, until the may be loss of power steering Off-Road Recovery right front tire contacts the pavement edge. assist. 3. Turn the steering wheel to go straight down the roadway. Curve Tips . Take curves at a reasonable Loss of Control speed. Skidding . Reduce speed before entering a curve. There are three types of skids that correspond to the vehicle's three . Maintain a reasonable steady control systems: speed through the curve. . Braking Skid — wheels are not . Wait until the vehicle is out of rolling. the curve before accelerating gently into the straightaway. The vehicle's right wheels can drop . Steering or Cornering Skid — off the edge of a road onto the too much speed or steering in a Steering in Emergencies shoulder while driving. Follow curve causes tires to slip and . There are some situations when these tips: lose cornering force. steering around a problem may . Acceleration Skid — too much be more effective than braking. causes the driving wheels to spin. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 191 Defensive drivers avoid most skids . Try to avoid sudden steering, by taking reasonable care suited to acceleration, or braking, { Warning existing conditions, and by not including reducing vehicle speed overdriving those conditions. But by shifting to a lower gear. Any When driving off-road, bouncing skids are always possible. sudden changes could cause and quick changes in direction the tires to slide. can easily throw you out of If the vehicle starts to slide, follow position. This could cause you to these suggestions: Remember: Antilock brakes help lose control and crash. You and . Ease your foot off the avoid only the braking skid. your passengers should always accelerator pedal and steer the wear seat belts. way you want the vehicle to go. Off-Road Driving The vehicle may straighten out. Four-wheel-drive vehicles can be Before Driving Off-Road Be ready for a second skid if it used for off-road driving. Vehicles occurs. without four-wheel drive and . Have all necessary maintenance . Slow down and adjust your vehicles not equipped with All and service work completed. driving according to weather Terrain (AT) or On-Off Road (OOR) . Fuel the vehicle, fill fluid levels, conditions. Stopping distance tires must not be driven off-road and check inflation pressure in can be longer and vehicle except on a level, solid surface. For all tires, including the spare, control can be affected when contact information about the if equipped. traction is reduced by water, original equipment tires, see the . Read all the information about snow, ice, gravel, or other warranty manual. four-wheel-drive vehicles in this material on the road. Learn to One of the best ways for successful manual. recognize warning clues — such off-road driving is to control the as enough water, ice, or packed speed. . Remove any underbody air snow on the road to make a deflector, if equipped. Re-attach mirrored surface — and slow the air deflector after off-road down when you have any doubt. driving. . Know the local laws that apply to off-road driving. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

192 Driving and Operating To gain more ground clearance if Environmental Concerns needed, it may be necessary to Warning (Continued) . Always use established trails, remove the front fascia lower air roads, and areas that have been dam, if equipped. However, driving passengers can be struck set aside for public off-road without the air dam reduces fuel by flying objects. Secure the recreational driving and obey all economy. cargo properly. posted regulations. . Keep cargo in the cargo Caution area as far forward and as . Do not damage shrubs, flowers, low as possible. The trees, or grasses or disturb Operating the vehicle for heaviest things should be wildlife. extended periods without the front on the floor, forward of the . Do not park over things that fascia lower air dam installed can rear axle. burn. See Parking over Things cause improper airflow to the . Heavy loads on the roof That Burn 0 219. engine. Reattach the front fascia raise the vehicle's center of air dam after off-road driving. gravity, making it more likely Driving on Hills to roll over. You can be Driving safely on hills requires good Loading the Vehicle for seriously or fatally injured if judgment and an understanding of the vehicle rolls over. Put what the vehicle can and cannot do. Off-Road Driving heavy loads inside the cargo area, not on the roof. { Warning { Warning Many hills are simply too steep . Unsecured cargo on the For more information about loading for any vehicle. Driving up hills load floor can be tossed the vehicle, see Vehicle Load Limits about when driving over 0 200 and can cause the vehicle to stall. rough terrain. You or your Tires 0 379. Driving down hills can cause loss of control. Driving across hills can (Continued) (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 193

Warning (Continued) { Warning Warning (Continued)

cause a rollover. You could be Driving to the top of a hill at high transfer case overrides the injured or killed. Do not drive on speed can cause a crash. There transmission. You or someone steep hills. could be a drop-off, embankment, else could be injured. If leaving cliff, or even another vehicle. You the vehicle, set the parking brake Before driving on a hill, assess the could be seriously injured or and shift the transmission to steepness, traction, and killed. As you near the top of a P (Park). Shift the transfer case to obstructions. If the terrain ahead hill, slow down and stay alert. any position but N (Neutral). cannot be seen, get out of the vehicle and walk the hill before . Never go downhill forward or . When driving down a hill, keep driving further. backward with either the the vehicle headed straight When driving on hills: transmission or transfer case in down. Use a low gear because N (Neutral). The brakes could the engine will work with the . Use a low gear and keep a firm overheat and you could lose brakes to slow the vehicle and grip on the steering wheel. control. help keep the vehicle under . Maintain a slow speed. control. . When possible, drive straight up { Warning or down the hill. { Warning If the vehicle has the two-speed . Slow down when approaching automatic transfer case, shifting Heavy braking when going down the top of the hill. the transfer case to N (Neutral) a hill can cause your brakes to . Use headlamps even during the can cause your vehicle to roll overheat and fade. This could day to make the vehicle more even if the transmission is in cause loss of control and you or visible. P (Park). This is because the others could be injured or killed. N (Neutral) position on the Apply the brakes lightly when (Continued) (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

194 Driving and Operating 2. Shift into P (Park) and then 3. If the vehicle cannot be Warning (Continued) restart the engine. restarted after stalling, set the parking brake, shift into descending a hill and use a low . If driving uphill when the vehicle stalls, shift to P (Park), and turn the gear to keep vehicle speed under vehicle off. control. R (Reverse), release the parking brake, and back 3.1. Leave the vehicle and straight down. seek help. If a condition is detected, a DIC warning message is . Never try to turn the vehicle 3.2. Stay clear of the path the displayed. Adjust brake pedal use around. If the hill is steep vehicle would take if it and shift to a lower transmission enough to stall the vehicle, rolled downhill. gear to reduce braking. it is steep enough to cause . Avoid turns that take the vehicle it to roll over. If the brakes continue to fade to a across the incline of the hill. severe condition, additional DIC . If you cannot make it up the A hill that can be driven straight messages are displayed. The brake hill, back straight down up or down might be too steep to system warning light will illuminate, the hill. drive across. Driving across an and the vehicle speed may be . Never back down a hill in incline puts more weight on the limited. See Brake System Warning N (Neutral) using only the downhill wheels, which could Light 0 139. brake. The vehicle can roll cause a downhill slide or a rollover. If the vehicle stalls on a hill: backward quickly and you could lose control. . Surface conditions can be a 1. Apply the brakes to stop the . If driving downhill when the problem. Loose gravel, muddy vehicle, and then apply the spots, or even wet grass can parking brake. vehicle stalls, shift to a lower gear, release the cause the tires to slip sideways, parking brake, and drive downhill. If the vehicle slips straight down the hill. sideways, it can hit something that will trip it — a rock, a rut, etc. — and roll over. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 195 . Hidden obstacles can make the Driving in Mud, Sand, Snow, steepness of the incline more or Ice Warning (Continued) severe. If a rock is driven across with the uphill wheels, or if the Use a low gear when driving in mud you and your passengers could downhill wheels drop into a rut — the deeper the mud, the lower drown. Drive your vehicle on safe or depression, the vehicle can tilt the gear. Keep the vehicle moving surfaces only. even more. to avoid getting stuck. . If an incline must be driven Traction changes when driving on Driving in Water across, and the vehicle starts to sand. On loose sand, such as on slide, turn downhill. This should beaches or sand dunes, the tires { Warning help straighten out the vehicle tend to sink into the sand. This and prevent the side slipping. affects steering, accelerating, and Driving through rushing water can braking. Drive at a reduced speed be dangerous. Deep water can and avoid sharp turns or abrupt sweep your vehicle downstream { Warning maneuvers. and you and your passengers Getting out of the vehicle on the Traction is reduced on hard packed could drown. If it is only shallow downhill side when stopped snow and ice and it is easy to lose water, it can still wash away the across an incline is dangerous. control. Reduce vehicle speed when ground from under your tires. If the vehicle rolls over, you could driving on hard packed snow Traction could be lost, and the be crushed or killed. Always get and ice. vehicle could roll over. Do not out on the uphill side of the drive through rushing water. vehicle and stay well clear of the { Warning rollover path. Driving on frozen lakes, ponds, or rivers can be dangerous. Ice conditions vary greatly and the vehicle could fall through the ice; (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

196 Driving and Operating After operation in mud or sand, Caution have the brake linings cleaned and { Warning checked. These substances can Do not drive through standing cause glazing and uneven braking. Wet brakes can cause crashes. water if it is deep enough to cover Check the body structure, driveline, They might not work as well in a the wheel hubs, , or exhaust steering, suspension, wheels, tires, quick stop and could cause pipe. Deep water can damage the and exhaust system for damage and pulling to one side. You could axle and other vehicle parts. check the fuel lines and cooling lose control of the vehicle. system for any leakage. After driving through a large If the standing water is not too deep, More frequent maintenance service puddle of water or a car/vehicle drive through it slowly. At faster is required. See the Maintenance wash, lightly apply the brake speeds, water can get into the Schedule 0 441. pedal until the brakes work engine and cause it to stall. Stalling normally. can occur if the exhaust pipe is Driving on Wet Roads under water. Do not turn off the Flowing or rushing water creates ignition when driving through water. Rain and wet roads can reduce strong forces. Driving through If the exhaust pipe is under water, vehicle traction and affect your flowing water could cause the the engine will not start. When going ability to stop and accelerate. vehicle to be carried away. If this through water, the brakes get wet Always drive slower in these types happens, you and other vehicle and it may take longer to stop. See of driving conditions and avoid occupants could drown. Do not “Driving on Wet Roads” later in this driving through large puddles and ignore police warnings and be section. deep-standing or flowing water. very cautious about trying to drive through flowing water. After Off-Road Driving Remove any brush or debris that has collected on the underbody or Hydroplaning chassis, or under the hood. These Hydroplaning is dangerous. Water accumulations can be a fire hazard. can build up under the vehicle's Re-install underbody air deflector tires so they actually ride on the and air dam if removed. water. This can happen if the road is GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 197 wet enough and you are going fast . Keep the vehicle serviced and in enough. When the vehicle is good shape. Warning (Continued) hydroplaning, it has little or no . Check all fluid levels and brakes, contact with the road. loss of steering assist. Always tires, cooling system, and have the engine running and the There is no hard and fast rule about transmission. vehicle in gear. hydroplaning. The best advice is to . Shift to a lower gear when going slow down when the road is wet. down steep or long hills. . Drive at speeds that keep the Other Rainy Weather Tips vehicle in its own lane. Do not Besides slowing down, other wet { Warning swing wide or cross the center line. weather driving tips include: Using the brakes to slow the . Allow extra following distance. vehicle on a long downhill slope . Be alert on top of hills; can cause brake overheating, can something could be in your lane . Pass with caution. (e.g., stalled car, crash). reduce brake performance, and . Keep windshield wiping could result in a loss of braking. . Pay attention to special road equipment in good shape. Shift the transmission to a lower signs (e.g., falling rocks area, . Keep the windshield washer fluid gear to let the engine assist the winding roads, long grades, reservoir filled. brakes on a steep downhill slope. passing or no-passing zones) and take appropriate action. . Have good tires with proper 0 tread depth. See Tires 379. Winter Driving . Turn off cruise control. { Warning Driving on Snow or Ice Coasting downhill in N (Neutral) Hill and Mountain Roads Snow or ice between the tires and or with the ignition off is Driving on steep hills or through the road creates less traction or dangerous. This can cause grip, so drive carefully. Wet ice can mountains is different than driving overheating of the brakes and on flat or rolling terrain. Tips include: occur at about 0 °C (32 °F) when (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

198 Driving and Operating freezing rain begins to fall. Avoid . Turn off cruise control. driving on wet ice or in freezing rain Warning (Continued) until roads can be treated. Blizzard Conditions If the vehicle is stuck in snow: Stop the vehicle in a safe place and For Slippery Road Driving: signal for help. Stay with the vehicle . Clear snow from the base of . Accelerate gently. Accelerating unless there is help nearby. the vehicle, especially any too quickly causes the wheels to If possible, use Roadside blocking the exhaust pipe. spin and makes the surface Assistance. See Roadside . Open a window about 5 cm under the tires slick. 0 Assistance Program 466. To get (2 in) on the vehicle side . Turn on Traction Control. See help and keep everyone in the that is away from the wind, Traction Control/Electronic vehicle safe: to bring in fresh air. Stability Control 0 235. . Turn on the hazard warning . Fully open the air outlets on . The Antilock Brake System flashers. or under the instrument (ABS) improves vehicle stability . Tie a red cloth to an outside panel. during hard stops, but the mirror. . Adjust the climate control brakes should be applied sooner system to circulate the air than when on dry pavement. { Warning inside the vehicle and set See Antilock Brake System the fan speed to the highest (ABS) 0 232. Snow can trap engine exhaust setting. See “Climate . Allow greater following distance under the vehicle. This may Control Systems.” and watch for slippery spots. Icy cause exhaust gases to get inside. Engine exhaust contains For more information about CO, patches can occur on otherwise 0 clear roads in shaded areas. carbon monoxide (CO), which see Engine Exhaust 220. The surface of a curve or an cannot be seen or smelled. It can overpass can remain icy when cause unconsciousness and even To save fuel, run the engine for the surrounding roads are clear. death. short periods to warm the vehicle Avoid sudden steering (Continued) and then shut the engine off and maneuvers and braking while partially close the window. Moving on ice. about to keep warm also helps. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 199 If it takes time for help to arrive, Turn the steering wheel left and when running the engine, push the { Warning right to clear the area around the accelerator pedal slightly so the front wheels. Then make sure the engine runs faster than the idle If the vehicle's tires spin at high wheels are pointed straight ahead. speed. This keeps the battery speed, they can explode, and you For four-wheel-drive vehicles, shift charged to restart the vehicle and to or others could be injured. The into Four-Wheel Drive High. Turn signal for help with the headlamps. vehicle can overheat, causing an the TCS off. Shift back and forth Do this as little as possible, to engine compartment fire or other between R (Reverse) and a forward save fuel. damage. Spin the wheels as little gear, spinning the wheels as little as as possible and avoid going possible. To prevent transmission If the Vehicle Is Stuck above 56 km/h (35 mph). wear, wait until the wheels stop spinning before shifting gears. Slowly and cautiously spin the Slowly spinning the wheels in the For information about using tire wheels to free the vehicle when forward and reverse directions chains on the vehicle, see Tire stuck in sand, mud, ice, or snow. causes a rocking motion that could Chains 0 404. See “Rocking the Vehicle to Get It free the vehicle. If that does not get Out” later in this section. Rocking the Vehicle to Get the vehicle out after a few tries, it The Traction Control/Electronic It Out might need to be towed out. See Stability Control can often help to Towing the Vehicle 0 424. Recovery free a stuck vehicle. See Traction Caution hooks can be used, if the vehicle Control/Electronic Stability Control has them. 0 235. If TC/ESC cannot free the Do not hold the steering wheel at vehicle, see “Rocking the Vehicle to full rotation for more than Get it Out” following. 15 seconds and/or at an elevated RPM. Damage may occur to the power steering system and there may be loss of power steering assist. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

200 Driving and Operating Recovery Hooks Caution { Warning { Warning Never use recovery hooks to tow Do not load the vehicle any the vehicle. The vehicle could be Never pull on recovery hooks heavier than the Gross damaged, and the repairs would from the side. The hooks could Vehicle Weight Rating not be covered by the vehicle break and you and others could (GVWR), or either the warranty. be injured. When using recovery maximum front or rear Gross hooks, always pull the vehicle Axle Weight Rating (GAWR). from the front. There are recovery hooks at the This can cause systems to front of the vehicle. Use them if the break and change the way the vehicle is stuck off-road and needs vehicle handles. This could to be pulled some place to continue cause loss of control and a driving. crash. Overloading can also reduce stopping distance, Vehicle Load Limits damage the tires, and shorten It is very important to know how the life of the vehicle. much weight the vehicle can carry. This weight is called the vehicle capacity weight and includes the weight of all occupants, cargo, and all nonfactory-installed options. Two labels on the vehicle may show how much weight it was designed to carry: the Tire and Loading Information label and the Certification/Tire label. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 201 Tire and Loading Information tires (3) and the recommended 2. Determine the combined Label cold tire inflation pressures (4). weight of the driver and For more information on tires passengers that will be and inflation see Tires 0 379 riding in your vehicle. and 0 3. Subtract the combined Tire Pressure 387. weight of the driver and There is also important loading passengers from XXX kg or information on the vehicle XXX lbs. Certification/Tire label. It may 4. The resulting figure equals show the Gross Vehicle Weight the available amount of Rating (GVWR) and the Gross cargo and luggage load Axle Weight Rating (GAWR) for capacity. For example, if the the front and rear axles. See "XXX" amount equals Label Example Certification/Tire Label later in “ ” 1400 lbs. and there will be this section. A vehicle-specific Tire and five 150 lb passengers in Loading Information label is “Steps for Determining Correct your vehicle, the amount of attached to the center pillar Load Limit– available cargo and luggage (B-pillar). The Tire and Loading 1. Locate the statement "The load capacity is 650 lbs. Information label shows the combined weight of (1400-750 (5 x 150) = number of occupant seating occupants and cargo should 650 lbs.) positions (1), and the maximum never exceed XXX kg or 5. Determine the combined vehicle capacity weight (2) in XXX lbs." on your vehicle s kilograms and pounds. ’ weight of luggage and cargo placard. being loaded on the vehicle. The Tire and Loading That weight may not safely Information label also shows the size of the original equipment GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

202 Driving and Operating exceed the available cargo and luggage load capacity calculated in Step 4. 6. If your vehicle will be towing a trailer, load from your trailer will be transferred to your vehicle. Consult this manual to determine how this reduces the available cargo and luggage load capacity of your vehicle.” Example 1 Example 2 See Trailer Towing 0 292 for important information on towing 1. Vehicle Capacity Weight for 1. Vehicle Capacity Weight for a trailer, towing safety rules, and Example 1 = (453 kg) Example 2 = 453 kg trailering tips. (1,000 lb) (1,000 lb) 2. Subtract Occupant Weight 2. Subtract Occupant Weight @ 68 kg (150 lb) × 2 = @ 68 kg (150 lb) × 5 = 136 kg (300 lb) 340 kg (750 lb) 3. Available Occupant and 3. Available Cargo Weight = Cargo Weight = 317 kg 113 kg (250 lb) (700 lb) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 203 of the driver, passengers, and includes the weight of the cargo should never exceed the vehicle, all occupants, fuel, and vehicle's capacity weight. cargo. Certification/Tire Label The Certification/Tire label also may show the maximum weights for the front and rear axles, called Gross Axle Weight Rating (GAWR). To determine the actual loads on the front and rear axles, weigh the vehicle at a weigh station. Your dealer can Example 3 help with this. Be sure to spread the load equally on both sides of 1. Vehicle Capacity Weight for Example 3 = 453 kg the centerline. (1,000 lb) The Certification/Tire label also 2. Subtract Occupant Weight contains important information @ 91 kg (200 lb) × 5 = A vehicle-specific Certification/ about the Front Axle Reserve 453 kg (1,000 lb) Tire label is label is attached to Capacity. See Adding a Snow 3. Available Cargo Weight = the center pillar (B-pillar). The Plow or Similar Equipment 0 kg (0 lb) label may show the size of the 0 323. Refer to the Tire and Loading vehicle's original tires and the Information label for specific inflation pressures needed to information about the vehicle's obtain the gross weight capacity capacity weight and seating of the vehicle. This is called positions. The combined weight Gross Vehicle Weight Rating (GVWR). The GVWR GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

204 Driving and Operating There is also important loading { Warning { Warning information for off-road driving in In the case of a sudden stop Things you put inside the this manual. See “Loading the or collision, things carried in vehicle can strike and injure Vehicle for Off-Road Driving“ 0 the bed of your truck could people in a sudden stop or under Off-Road Driving 191. shift forward and come into turn, or in a crash. Two-Tiered Loading the passenger area, injuring . Put things in the cargo you and others. If you put Depending on the model of the area of the vehicle. Try to pickup, an upper load platform things in the bed of your truck, spread the weight evenly. you should make sure they can be created by positioning are properly secured. . Never stack heavier three or four 5 cm (2 in) by things, like suitcases, 15 cm (6 in) wooden planks inside the vehicle so that across the width of the pickup some of them are above box. The planks must be Caution the tops of the seats. inserted in the pickup box depressions. Overloading the vehicle may . Do not leave an cause damage. Repairs would not unsecured child restraint When using this upper load be covered by the vehicle in the vehicle. platform, be sure the load is warranty. Do not overload the securely tied down to prevent it vehicle. . When you carry from shifting. The load's center something inside the of gravity should be positioned vehicle, secure it in a zone over the rear axle. The Using heavier suspension whenever you can. components to get added zone is located in the area durability might not change the . Do not leave a seat between the front of each wheel weight ratings. Ask your dealer folded down unless you well and the rear of each wheel to help load the vehicle the need to. right way. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 205 well. The center of gravity height Loading Points must not extend above the top Caution of the pickup box flareboard. Overloading the vehicle may Any load that extends beyond cause damage. Repairs would not the vehicle's taillamp area must be covered by the vehicle be properly marked according to warranty. Do not overload the local laws and regulations. vehicle. Remember not to exceed the Gross Axle Weight Remember not to exceed the Rating (GAWR) of the front or Gross Axle Weight rear axle. Rating (GAWR) of the front or rear axle. Add-On Equipment Maximum When carrying removable items, * Equipment Weight 1. Primary Load Points a limit on how many people 2. Secondary Load Areas Ladder Rack 340 kg (750 lb) carried inside the vehicle may 3. GM Approved Accessory and Cargo be necessary. Be sure to weigh Mounting Points the vehicle before buying and Cross Toolbox 181 kg (400 lb) Structural members (1) and (2) are installing the new equipment. and Cargo included in the pickup box design. Additional accessories should use Side Boxes 113 kg per these load points. Depending on the and Cargo side (250 lb accessory design, use a spacer per side) under the accessory at the load points to remove gap. The holes for * The combined weight for all GM approved accessories (3) are rail-mounted equipment should not intended for aftermarket not exceed 454 kg (1,000 lb). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

206 Driving and Operating equipment. See www.gmupfitter.com When carrying a slide-in for additional pickup box load camper, the total cargo load of bearing structural information. the vehicle is the weight of the camper plus: Truck-Camper Loading Information . Everything added to the camper after it left the A vehicle-specific Truck-Camper factory. Loading Information label is . Everything in the camper. attached to the inside of the Use the rear edge of the load vehicle's glove box. This label . All the people inside. floor for measurement purposes. indicates if a slide-in camper The CWR is the maximum The recommended location for can be carried, how much of a weight of the load the vehicle the cargo center of gravity is in load the vehicle can carry, and can carry. It does not include the zone C for the CWR. It is the how to correctly spread out the weight of the people inside. But, point where the mass of a body load. It will help to match the use about 68 kg (150 lb) for is concentrated and, right slide-in camper to the each seat. if suspended at that point, would vehicle. balance the front and rear. The total cargo load must not be Your dealer can help make a more than the vehicle's CWR. Here is an example of proper good vehicle-camper match and truck and camper match: help determine the Cargo Refer to the Truck-Camper Weight Rating (CWR). Loading Information label in the glove box for dimensions A and When installing and loading a B as shown in the following slide-in camper, check the illustration. manufacturer's instructions. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 207 exceed the truck's cargo weight gross axle weight ratings rating, and the camper's center (GAWR). The total axle loads of gravity (1) should fall within should not exceed the vehicle's the truck's recommended center gross vehicle weight rating of gravity zone (2) when (GVWR). These ratings are installed. given on the Certification/Tire Any accessories or other label attached to the B-pillar. equipment that are added to the See “Certification/Tire Label” under Vehicle Load vehicle must be weighed. Then, 0 subtract this extra weight from Limits 200. If weight ratings the CWR. This extra weight may are exceeded, move or remove shorten the center of gravity items to bring all weights below 1. Camper Center of the ratings. Gravity zone of the vehicle. 2. Recommended Center of If the slide-in camper and its See your dealer for more Gravity Location Zone load weighs less than the CWR, information on curb weights, cargo weights, Cargo Weight When the truck is used to carry the center of gravity zone for the vehicle may be larger. Rating, and the correct center of a slide-in camper, the total cargo gravity zone. load of the truck consists of the Secure loose items to prevent manufacturer's camper weight weight shifts that could affect the figure, the weight of installed balance of the vehicle. When the additional camper equipment not truck-camper is loaded, drive to included in the manufacturer's a scale and weigh on the front camper weight figure, the weight and on the rear wheels of camper cargo, and the weight separately to determine axle of passengers in the camper. loads. Individual axle loads The total cargo load should not should not exceed either of the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

208 Driving and Operating Ignition Positions Starting and Caution (Continued) Operating (Keyless Access) . Avoid making hard stops for New Vehicle Break-In the first 322 km (200 mi) or so. During this time the new Caution brake linings are not yet broken in. Hard stops with The vehicle does not need an new linings can mean elaborate break-in. But it will premature wear and earlier perform better in the long run if replacement. Follow this you follow these guidelines: breaking-in guideline every . Keep the vehicle speed at time you get new brake 88 km/h (55 mph) or less for linings. the first 805 km (500 mi). . Do not tow a trailer during . Do not drive at any one break-in. See Trailer Towing Vehicles equipped with Keyless constant speed, fast or slow, 0 292 for the trailer towing Access have pushbutton starting. for the first 805 km (500 mi). capabilities of the vehicle The Remote Keyless Entry (RKE) Do not make full-throttle and more information. transmitter must be in the vehicle for starts. Avoid downshifting to Following break-in, engine speed the system to operate. If the brake or slow the vehicle. and load can be gradually pushbutton start is not working, the (Continued) increased. vehicle may be near a strong radio antenna signal causing interference GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 209 to the Keyless Access system. See If the vehicle is in P (Park), the power assist in the brake and Remote Keyless Entry (RKE) ignition will turn off, and Retained steering systems and disable the System Operation (Key Access) Accessory Power (RAP) will remain airbags. 0 13 or active. See Retained Accessory 0 If the vehicle must be shut off in an Remote Keyless Entry (RKE) Power (RAP) 216. emergency: System Operation (Keyless Access) If the vehicle is not in P (Park), the 0 16. 1. If the vehicle cannot be pulled ignition will return to ACC/ over, and must be shut off To shift out of P (Park), the ignition ACCESSORY and display the while driving, press and hold must be on or in Service Mode, and message SHIFT TO PARK in the ENGINE START/STOP button the brake pedal must be applied. Driver Information Center (DIC). for longer than two seconds, When the vehicle is shifted into or press twice in five seconds. { Warning P (Park), the ignition system will turn off. 2. Brake using a firm and steady Turning off the vehicle while pressure. Do not pump the The vehicle may have an electric brakes repeatedly. This may moving may cause loss of power steering column lock. The lock is assist in the brake and steering deplete power assist, requiring activated when the ignition is turned increased brake pedal force. systems and disable the airbags. off and driver door is opened. While driving, only shut the A sound may be heard as the lock 3. Shift the vehicle to N (Neutral). vehicle off in an emergency. actuates or releases. The steering This can be done while the column lock may not release with vehicle is moving. After shifting to N (Neutral), firmly apply the Stopping the Engine/LOCK/ the wheels turned off center. If this happens, the vehicle may not start. brakes and steer the vehicle to OFF (No Indicator Lights) : When a safe location. the vehicle is stopped, press Move the steering wheel from left to ENGINE START/STOP once to turn right while attempting to start the 4. Come to a complete stop, shift the engine off. vehicle. If this does not work, the to P (Park), and make sure vehicle needs service. engine is off. The shift lever Unless an emergency exists, do not must be in P (Park) to turn the turn the engine off when the vehicle ignition off. is moving. This will cause a loss of GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

210 Driving and Operating 5. Set the parking brake. See the brake pedal applied, pressing Ignition Positions (Key Electric Parking Brake 0 233. ENGINE START/STOP button once will turn the ignition on. Once engine Access) { Warning cranking begins, release the button. Engine cranking will continue until Turning off the vehicle while the engine starts. See Starting the moving may cause loss of power Engine 0 212. assist in the brake and steering Service Mode systems and disable the airbags. While driving, only shut the This power mode is available for vehicle off in an emergency. service and diagnostics, and to verify the proper operation of the malfunction indicator lamp as may ACC/ACCESSORY (Amber be required for emission inspection Indicator Light) : This mode allows purposes. With the vehicle off, and some electrical accessories to be the brake pedal not applied, used when the engine is off. pressing and holding the ENGINE 0. Stopping the Engine/LOCK/OFF START/STOP button for more than With the ignition off, pressing the 1. ACC/ACCESSORY ENGINE START/STOP button one five seconds will place the vehicle in time without the brake pedal applied Service Mode. The instruments and 2. ON/RUN audio systems will operate as they will place the ignition system in 3. START ACC/ACCESSORY. do when the ignition is on, but the vehicle will not be able to be driven. The ignition switch has four The ignition will switch from ACC/ The engine will not start in Service positions. ACCESSORY to off after Mode. Press the ENGINE START/ To shift out of P (Park), the ignition five minutes to prevent battery STOP button again to turn the rundown. must be ON/RUN and the brake ignition off. pedal must be applied. ON/RUN/START (Green Indicator Light) : This mode is for driving and starting. With the ignition off, and GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 211 0 (Stopping the Engine/LOCK/ 4. Push the key all the way in OFF) : This position turns off the toward the steering column, { Warning vehicle. It also locks the ignition, the then turn the key to transmission, and the steering LOCK/OFF. Turning off the vehicle while moving may cause loss of power column, if equipped with a locking 5. Remove the key. steering column. assist in the brake and steering 6. Release the brake pedal. systems and disable the airbags. While driving, turn off the vehicle See your dealer if the key can be removed in any other position. only in an emergency. Retained Accessory Power (RAP) will remain active. See Retained In an emergency, if the vehicle Accessory Power (RAP) 0 216. cannot be pulled over and must be turned off while driving: A warning chime will sound when the driver door is opened and the 1. Push the key all the way in key is in the ignition. toward the steering column, then turn the key to ACC/ If equipped with a locking steering ACCESSORY. column, the steering can bind with the front wheels turned off center, 2. Brake using firm and steady To turn off the vehicle: which may prevent key rotation out pressure. Do not pump the brakes repeatedly. This may 1. Make sure that the vehicle is of LOCK/OFF. If this happens, move deplete power assist, requiring stopped. the steering wheel from right to left while turning the key to ACC/ increased brake pedal force. 2. Shift to P (Park). ACCESSORY. If this does not work, 3. Shift the vehicle to N (Neutral). 3. Continue to hold the brake then the vehicle needs service. This can be done while the pedal, then set the parking vehicle is moving. Continue brake. See Electric Parking braking and steer the vehicle to Brake 0 233. a safe location. 4. Come to a complete stop. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

212 Driving and Operating 5. Shift to P (Park). vehicle must be pushed or towed. If the key is left in ON/RUN with the See Retained Accessory Power engine off, the battery could drain 6. Push the key all the way in 0 toward the steering column (1), (RAP) 216. and the vehicle may not start. then turn the ignition to From ON/RUN, push the key all the 3 (START) : This is the position that LOCK/OFF (2). way in toward the steering column, starts the engine. When the engine 7. Set the parking brake. See then turn the key to ACC/ starts, release the key. The ignition Electric Parking Brake 0 233. ACCESSORY. returns to ON/RUN for driving. 8. Remove the key. If the key is left in ACC/ ACCESSORY with the engine off, Starting the Engine 9. Release the brake pedal. the battery could drain and the If the vehicle has a diesel engine, vehicle may not start. see the Duramax diesel Caution A warning chime will sound when supplement. the driver door is opened and the Use the correct key, make sure it key is in the ignition. Caution is all the way in — or pushed all 2 (ON/RUN) : This position can be the way in toward the steering If you add electrical parts or used to operate the electrical column when turning off the accessories, you could change accessories and to display some vehicle — and turn it only with the way the engine operates. Any your hand. instrument cluster warning and indicator lights. This position can resulting damage would not be also be used for service and covered by the vehicle warranty. 1 (ACC/ACCESSORY) : This diagnostics, and to verify the proper See Add-On Electrical Equipment position allows features such as the operation of the malfunction 0 322. infotainment system to operate indicator lamp as may be required while the vehicle is off. It also for emission inspection purposes. Move the shift lever to P (Park) or unlocks the steering column, The switch stays in this position N (Neutral). To restart the engine if equipped with a locking steering when the engine is running. The when the vehicle is already moving, column. Use this position if the transmission is also unlocked in this use N (Neutral) only. position. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 213 engine and transmission gently accelerator pedal all the way to Caution to allow the oil to warm up and the floor and holding it there lubricate all moving parts. while holding the key in START Do not try to shift to P (Park) if the When the low fuel warning light or ENGINE START/STOP for vehicle is moving. If you do, you up to a maximum of could damage the transmission. is on and the FUEL LEVEL LOW message is displayed in 15 seconds. Wait at least Shift to P (Park) only when the 15 seconds between each try, vehicle is stopped. the Driver Information Center (DIC), hold the ignition switch to allow the cranking motor to in the START position to cool down. When the engine Starting Procedure continue engine cranking. starts, let go of the key or button and accelerator. If the 1. For Key Access vehicles, turn vehicle starts briefly but then the ignition key to Start. When Caution stops again, do the same thing. the engine starts, let go of the This clears the extra Cranking the engine for long key. For Keyless Access from the engine. Do not race vehicles, the RKE transmitter periods of time, by returning the the engine immediately after must be in the vehicle. Press ignition to the START position starting it. Operate the engine ENGINE START/STOP with the immediately after cranking has and transmission gently until brake pedal applied. When the ended, can overheat and damage the oil warms up and lubricates engine begins cranking, let go the cranking motor, and drain the all moving parts. of the button. battery. Wait at least 15 seconds The driver may observe a between each try, to let the Stop/Start System cranking motor cool down. minor, and temporary, brake If equipped, the Stop/Start system pedal kickback when starting will shut off the engine to help the vehicle. This is normal. 2. If the engine does not start conserve fuel. It has components The idle speed will go down as after five to 10 seconds, designed for the increased number the engine gets warm. Do not especially in very cold weather of starts. race the engine immediately (below −18 °C or 0 °F), it could after starting it. Operate the be flooded with too much gasoline. Try pushing the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

214 Driving and Operating Auto Stops may not occur and/or . The driver door has been { Warning Auto Starts may occur because: opened or the driver seat belt has been unbuckled. The automatic engine Stop/Start . The climate control settings feature causes the engine to shut require the engine to be running . The hood has been opened. off while the vehicle is still on. Do to cool or heat the vehicle . The Auto Stop has reached the not exit the vehicle before shifting interior. maximum allowed time. to P (Park). The vehicle may . The vehicle battery charge restart and move unexpectedly. is low. Auto Stop Disable Switch Always shift to P (Park), and then . The vehicle battery has recently turn the ignition off before exiting been disconnected. the vehicle. . Minimum vehicle speed has not been reached since the last Auto Engine Stop/Start Auto Stop. When the brakes are applied and . The accelerator pedal is the vehicle is at a complete stop, pressed. the engine may turn off. When stopped, the tachometer displays . The engine or transmission is AUTO STOP. See Tachometer not at the required operating 0 131. When the brake pedal is temperature. released or the accelerator pedal is . The outside temperature is not pressed, the engine will restart. in the required operating range. If equipped, the automatic engine To maintain vehicle performance, . The vehicle is in any gear other Stop/Start feature can be disabled other conditions may cause the than D (Drive). and enabled by pressing the switch engine to automatically restart with the h symbol. Auto Stop is . Tow/Haul Mode or other driver before the brake pedal is released. enabled each time you start the modes have been selected. vehicle. . The vehicle is on a steep hill or grade. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 215 When h is illuminated, the system To Use the Engine Heater is enabled. 1. Turn off the engine. Engine Heater 2. Check the heater cord for damage. If it is damaged, do If equipped, the engine heater can not use it. See your dealer for provide easier starting and better a replacement. Inspect the fuel economy during engine cord for damage yearly. warm-up in cold weather conditions at or below −18 °C (0 °F). Vehicles with an engine heater should be plugged in at least four hours before starting. An internal thermostat in 1500 Base Model shown other the plug-end of the cord may exist, models are similar which will prevent engine heater operation at temperatures above −18 °C (0 °F).

{ Warning

Do not plug in the engine block heater while the vehicle is parked 3. 1500 only, remove the engine in a garage or under a carport. heater connector cover by Property damage or personal gently prying with a flat injury may result. Always park the blade tool. vehicle in a clear open area away from buildings or structures. 4. Plug the heater cord into the 2500/3500 connector in the front fascia. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

216 Driving and Operating 5. Plug the cord into a grounded The length of time the heater should 110-volt AC outlet that is Warning (Continued) remain plugged in depends on protected by a ground fault several factors. Ask a dealer in the detection function. it overheat and cause a fire, area where you will be parking the property damage, for the best advice on this. shock, and injury. { Warning . Do not operate the vehicle Retained Accessory Improper use of the heater cord with the heater cord Power (RAP) or an extension cord can damage permanently attached to the the cord and may result in vehicle. Possible heater When the ignition is turned from on overheating and fire. cord and thermostat to off, the following features (if damage could occur. equipped) will continue to function . Plug the cord into a for up to 10 minutes, or until the . While in use, do not let the three-prong electrical utility driver door is opened. These heater cord touch vehicle receptacle that is protected features will also work when the parts or sharp edges. Never by a ground fault detection ignition is in RUN or ACC/ close the hood on the function. An ungrounded ACCESSORY: outlet could cause an heater cord. . Infotainment System electric shock. . Before starting the vehicle, . Use a weatherproof, unplug the cord, reattach . Power Windows (during RAP heavy-duty, 15 amp-rated the cover to the plug, and this functionality will be lost extension cord if needed. securely fasten the cord. when any door is opened) Failure to use the Keep the cord away from . Sunroof (during RAP this recommended extension any moving parts. functionality will be lost when cord in good operating any door is opened) condition, or using a 6. Before starting the engine, be . Auxiliary Power Outlet damaged heater or sure to unplug and store extension cord, could make the cord. . Audio System (Continued) . OnStar System GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 217 Shifting Into Park 1. Hold the brake pedal down, Leaving the Vehicle with the then set the parking brake. See Engine Running Electric Parking Brake 0 233. { Warning 2. Move the shift lever into the { Warning It can be dangerous to get out of P (Park) position by pulling the the vehicle if the shift lever is not shift lever toward you and It can be dangerous to leave the fully in P (Park) with the parking moving it up as far as it will go. vehicle with the engine running. The vehicle could move suddenly brake firmly set. The vehicle can 3. Be sure the transfer case (if roll. If you have left the engine equipped) is in a drive if the shift lever is not fully in P (Park) with the parking brake running, the vehicle can move gear – not in N (Neutral). suddenly. You or others could be firmly set. 4. Turn the ignition off. For Key injured. To be sure the vehicle will Access, push the ignition key If you have four-wheel drive and not move, even when you are on in, towards the steering column the transfer case is in N (Neutral), fairly level ground, use the steps and then turn the ignition off. the vehicle will be free to roll, that follow. With four-wheel drive, even if the shift lever is in 5. For Key Access, remove the if the transfer case is in P (Park). So be sure the transfer N (Neutral), the vehicle will be key and take it with you. If you can leave the vehicle with the case is in a drive gear – not in free to roll, even if the shift lever N (Neutral). is in P (Park). Be sure the transfer ignition key in your hand, the case is in a drive gear. If towing a vehicle is in P (Park). And, if you leave the vehicle with trailer, see Driving Characteristics For Keyless Access, take the the engine running, it could and Towing Tips 0 287. Remote Keyless Entry (RKE) overheat and even catch fire. You transmitter with you. or others could be injured. Do not leave the vehicle with the engine running unless you have to. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

218 Driving and Operating If you have to leave the vehicle with When you are ready to drive, move To shift out of P (Park): the engine running, be sure the the shift lever out of P (Park) before 1. Apply the brake pedal. vehicle is in P (Park) and the you release the parking brake. 2. Release the parking brake if it parking brake is firmly set before If lock does occur, you may you leave it. After moving the shift is applied. See Electric Parking need to have another vehicle push Brake 0 233. lever into P (Park), hold the regular yours a little uphill to take some of brake pedal down. Then, see if you the pressure from the 3. Pull the shift lever toward you, can move the shift lever away from in the transmission. You will then be then move it to the desired P (Park) without first pulling it toward able to pull the shift lever out of position, and release. you. If you can, it means that the P (Park). shift lever was not fully locked into If the vehicle still cannot be shifted out of P (Park): P (Park). Shifting out of Park Torque Lock 1. Ease the pressure on, This vehicle is equipped with an or release the shift lever. If you are parking on a hill and you electronic shift lock release system. 2. While holding the brake pedal, do not shift the transmission into The system is designed to prevent push the shift lever all the way P (Park) properly, the weight of the movement of the shift lever out of into P (Park). vehicle may put too much force on P (Park), unless the brake pedal is the parking pawl in the applied and the ignition is on or in 3. Pull the shift lever toward you, transmission. You may find it difficult Service Mode. then move it to the desired position, and release. to pull the shift lever out of P (Park). The shift lock release is always This is called torque lock. To functional except in the case of an If there is still a problem shifting, prevent torque lock, set the parking uncharged or low voltage – less have the vehicle serviced soon. brake and then shift into P (Park) than 9 volt – battery. properly before you leave the driver seat. If the vehicle has an uncharged or low voltage battery, try charging or jump starting the battery. See Jump Starting - North America 0 419. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 219 Parking over Things Dynamic Fuel Management The vehicle could turn off sooner if it That Burn If equipped, Dynamic Fuel is parked on a hill, due to lack of Management calculates the number available fuel. { Warning of cylinders needed to maximize The timer will reset if the vehicle is fuel economy and meet the driving taken out of P (Park) while it is Things that can burn could touch demands. Dynamic Fuel running. hot exhaust parts under the Management allows the engine to vehicle and ignite. Do not park operate in multiple possible over papers, leaves, dry grass, configurations ranging from 1-cylinder up to the full 8-cylinder or other things that can burn. operation. Active Fuel Management Extended Parking If equipped, Active Fuel It is best not to park with the vehicle Management allows the gasoline running. If the vehicle is left running, engine to operate on either all of its be sure it will not move and there is cylinders, or a reduced number of adequate ventilation. cylinders, depending on the driving See Shifting Into Park 0 217 and conditions. When less power is Engine Exhaust 0 220. required, such as cruising at a constant vehicle speed, the system If the vehicle is left parked and will enable reduced cylinder running with the RKE transmitter operation, allowing the vehicle to outside the vehicle, it will continue achieve better fuel economy. When to run for up to half an hour. greater power is required, such as If the vehicle is left parked and accelerating from a stop, passing, running with the RKE transmitter or merging onto a freeway, the inside the vehicle, it will continue to system will maintain full-cylinder run for up to an hour. operation. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

220 Driving and Operating Engine Exhaust If the vehicle is left with the engine Warning (Continued) running, follow the proper steps to be sure the vehicle will not move. { Warning . There are holes or openings See Shifting Into Park 0 217 and in the vehicle body from Engine Exhaust 0 220. Engine exhaust contains carbon damage or aftermarket monoxide (CO), which cannot be modifications that are not If parking on a hill and pulling a seen or smelled. Exposure to CO completely sealed. trailer, see Driving Characteristics and Towing Tips 0 287. can cause unconsciousness and If unusual fumes are detected or even death. if it is suspected that exhaust is Exhaust may enter the vehicle if: coming into the vehicle: . The vehicle idles in areas . Drive it only with the with poor ventilation windows completely down. (parking garages, tunnels, . Have the vehicle repaired deep snow that may block immediately. underbody airflow or tail pipes). Never park the vehicle with the engine running in an enclosed . The exhaust smells or area such as a garage or a sounds strange or different. building that has no fresh air . The exhaust system leaks ventilation. due to corrosion or damage. . The vehicle exhaust system Running the Vehicle has been modified, damaged, or improperly While Parked repaired. It is better not to park with the (Continued) engine running. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 221 Automatic When parked on a hill, especially when the vehicle has a heavy load, { Warning Transmission you might notice an increase in the effort to shift out of P (Park). See If equipped with four-wheel drive, If equipped, there is an electronic Torque Lock under Shifting Into the vehicle will be free to roll if the shift lever position indicator within “ ” Park 0 217. transfer case is in N (Neutral), the instrument cluster. This display even when the shift lever is in comes on when the ignition is in { Warning P (Park). You or someone else ACC/ACCESSORY, on or could be seriously injured. Be service mode. It is dangerous to get out of the sure the transfer case is in a drive There are several different positions vehicle if the shift lever is not fully gear — 2 m, 4 m, or 4 n — or set the for the shift lever. in P (Park) with the parking brake parking brake before placing the firmly set. The vehicle can roll. transfer case in N (Neutral). See 0 Do not leave the vehicle when the Four-Wheel Drive 227. engine is running. If you have left the engine running, the vehicle R: Use this gear to back up. can move suddenly. You or others could be injured. To be sure the Caution vehicle will not move, even when See Driver Mode Control 0 238 and you are on fairly level ground, Shifting to R (Reverse) while the Range Selection Mode under “ ” always set the parking brake and vehicle is moving forward could Manual Mode 0 224. move the shift lever to P (Park). damage the transmission. The P: This position locks the rear See Shifting Into Park 0 217 and repairs would not be covered by wheels. Use P (Park) when starting Driving Characteristics and the vehicle warranty. Shift to the engine because the vehicle Towing Tips 0 287. R (Reverse) only after the vehicle cannot move easily. is stopped. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

222 Driving and Operating To rock the vehicle back and forth to D: This position is for normal get out of snow, ice, or sand without Caution driving. It provides the best fuel damaging the transmission, see If economy. If more power is needed the Vehicle Is Stuck 0 199. Shifting out of P (Park) or for passing, press the accelerator N (Neutral) with the engine pedal down. N: In this position, the engine does running at high speed may not connect with the wheels. To damage the transmission. The . When going less than about restart the engine when the vehicle repairs would not be covered by 55 km/h (35 mph), push the is already moving, use the vehicle warranty. Be sure the accelerator pedal about N (Neutral) only. halfway down. engine is not running at high Also, use N (Neutral) when the speed when shifting the vehicle. . When going about 55 km/h vehicle is being towed. (35 mph) or more, push the accelerator all the way down. { Warning Caution By doing this, the vehicle shifts down to the next gear and has Shifting into a drive gear while the more power. engine is running at high speed is A transmission or engine oil hot dangerous. Unless your foot is message may display if the Use D (Drive) and Tow/Haul Mode firmly on the brake pedal, the automatic transmission fluid or when towing a trailer, carrying a vehicle could move very rapidly. engine oil is too hot. Driving heavy load, driving on steep hills, or driving off-road. Shift the You could lose control and hit under this condition can damage transmission to a lower gear if the people or objects. Do not shift the vehicle. Stop and idle the transmission shifts too often. into a drive gear while the engine engine to cool the engine oil or is running at high speed. automatic transmission fluid. Downshifting the transmission in These messages will clear when slippery road conditions could result the engine oil or transmission in skidding. See “Skidding” under fluid has cooled sufficiently. Loss of Control 0 190. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 223 The vehicle has a shift stabilization The transmission uses adaptive L: This position allows selection of feature that adjusts the transmission shift controls. The adaptive shift a range of gears appropriate for shifting to the current driving control process continually current driving conditions. conditions in order to reduce rapid compares key shift parameters to If equipped, see “Range Selection upshifts and downshifts. This shift pre-programmed ideal shifts stored Mode” under Manual Mode 0 224. stabilization feature is designed to in the transmission’s computer. The determine, before making an transmission constantly makes Caution upshift, if the engine is able to adjustments to improve vehicle maintain vehicle speed by analyzing performance according to how the Spinning the tires or holding the things such as vehicle speed, vehicle is being used, such as with vehicle in one place on a hill throttle position, and vehicle load. a heavy load or when the using only the accelerator pedal If the shift stabilization feature temperature changes. During this may damage the transmission. determines that a current vehicle adaptive shift control process, The repair will not be covered by speed cannot be maintained, the shifting might feel different as the the vehicle warranty. If the vehicle transmission does not upshift and transmission determines the best is stuck, do not spin the tires. instead holds the current gear. settings. When stopping on a hill, use the In some cases, this could appear to When temperatures are very cold, brakes to hold the vehicle in be a delayed shift, however the the transmission's gear shifting place. transmission is operating normally. could be delayed providing more If the engine or transmission detects stable shifts until the engine warms an impending hot fluid condition, the up. Shifts could be more noticeable transmission may upshift to limit with a cold transmission. This temperatures. Downshifts may also difference in shifting is normal. be prevented. Normal operation If equipped with the 2.7L L4 engine, may continue unless the display engine speeds may be increased indicates there is a hot condition while driving at highway speeds and engine should be idled. while the engine is still warming up. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

224 Driving and Operating Manual Mode This number is the highest gear that the transmission will command while Range Selection Mode operating in L (Manual Mode). All gears below that number are available. As driving conditions change, the transmission can automatically shift to lower gears. For example, when L5 is selected, 1 (First) through 5 (Fifth) gears are automatically shifted by the transmission, but 6 (Sixth) cannot be Range Selection Mode helps control used until the plus/minus button on the vehicle's transmission and the shift lever is used to change to vehicle speed while driving downhill the range. or towing a trailer by letting you select a desired range of gears. When the shift lever is moved from D (Drive) to L (Manual Mode), a To use this feature: downshift may occur. The gear that 1. Move the shift lever to the transmission is operating in L (Manual Mode). when the shift lever is moved from D (Drive) to L (Manual Mode) 2. Press the plus/minus buttons determines if a downshift occurs. on the shift lever to select the See the following charts. desired range of gears for current driving conditions. When the shift lever is moved from D (Drive) to L (Manual Mode), a number displays next to the L, indicating the current transmission range. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 225 6-Speed Automatic Transmission Gear before shifting from 6th 5th 4th 3rd 2nd 1st D (Drive) to L (Manual Mode) Range after shifting from L4 L4 L3 L2 L2 L1 D (Drive) to L (Manual Mode)

8-Speed Automatic Transmission Gear before shifting from 8th 7th 6th 5th 4th 3rd 2nd 1st D (Drive) to L (Manual Mode) Range after shifting from D (Drive) to L6 L6 L5 L4 L3 L3 L2 L1 L (Manual Mode) – Tow/Haul not engaged Range after shifting from D (Drive) to L6 L5 L4 L3 L3 L3 L2 L1 L (Manual Mode) – Tow/Haul engaged GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

226 Driving and Operating 10-Speed Automatic Transmission

Gear before shifting from D (Drive) to 10th 9th 8th 7th 6th 5th 4th 3rd 2nd 1st L (Manual Mode) Range after shifting from D (Drive) to L7 L7 L7 L6 L5 L4 L3 L3 L2 L1 L (Manual Mode) - Tow/Haul not engaged Range after shifting from D (Drive) to L7 L7 L6 L5 L4 L3 L3 L3 L2 L1 L (Manual Mode) - Tow/Haul engaged

Grade Braking is not available when Low Traction Mode Range Selection Mode is active. Caution If equipped, Low Traction Mode See Tow/Haul Mode 0 227. Spinning the tires or holding the assists in vehicle acceleration when While using Range Selection Mode, vehicle in one place on a hill road conditions are slippery, such cruise control and the Tow/Haul using only the accelerator pedal as with ice or snow. While the Mode can be used. may damage the transmission. vehicle is at a stop, select L2 using If the vehicle has an exhaust brake, The repair will not be covered by Range Selection Mode. This will it can also be used, but will not the vehicle warranty. If the vehicle limit torque to the wheels and help automatically downshift the is stuck, do not spin the tires. prevent the tires from spinning. transmission. See “Exhaust Brake” When stopping on a hill, use the in the Duramax diesel supplement. brakes to hold the vehicle in place. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 227 Tow/Haul Mode If equipped, the Stop/Start system Drive Systems will become unavailable when Tow/ The Tow/Haul Mode adjusts the Haul Mode is active. transmission shift pattern to reduce Four-Wheel Drive Tow/Haul Mode Grade Braking shift cycling. This provides If equipped, four-wheel drive increased performance, vehicle Tow/Haul Mode Grade Braking is engages the front axle for extra control, and enhanced transmission only enabled while the Tow/Haul traction. and engine cooling when driving Mode is selected and the vehicle is Read the appropriate section for down steep hills or mountain not in the Range Selection Mode. transfer case operation before grades, when towing, or when See Manual Mode 0 224. Tow/Haul using. hauling heavy loads. See Driver Mode Grade Braking assists in 0 Mode Control 238 to activate Tow/ maintaining desired vehicle speeds Haul Mode. when driving on downhill grades by Caution using the engine and transmission to slow the vehicle. Do not drive on clean, dry pavement in 4 and 4 (if See Towing Equipment 0 296. m n equipped) for an extended period of time. These conditions may cause premature wear on the vehicle’s powertrain.

Driving on clean, dry pavement in 4 m or 4 n may: . Cause a vibration to be felt in the steering system. For vehicles without Driver Mode . Cause tires to wear faster. Control, press the Tow/Haul button on the center stack. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

228 Driving and Operating Shifting into 4 will turn Traction shift is in progress. The graphic { Warning n Control and StabiliTrak/Electronic displayed will change to indicate the setting requested. If equipped with four-wheel drive, Stability Control (ESC) off. See the vehicle will be free to roll if the Traction Control/Electronic Stability When the shift is complete the 0 transfer case is in N (Neutral), Control 235. graphic will stop flashing. The DIC even when the shift lever is in Automatic Transfer Case message turns off once the shift is P (Park). You or someone else complete. If the transfer case could be seriously injured. Be Two-Speed Transfer Case cannot complete a shift request, it will go back to its last chosen sure the transfer case is in a drive setting. gear — 2 m, 4 m, or 4 n — or set the The settings are: parking brake before placing the transfer case in N (Neutral). See N (Neutral) : Use only when the Shifting Into Park 0 217. vehicle needs to be towed. See Recreational Vehicle Towing 0 424 or Towing the Vehicle 0 424. Caution 2 m (Two-Wheel Drive High) : Use Extended high-speed operation in for driving on most streets and 4 n may damage or shorten the highways. The front axle is not life of the . engaged. This setting provides the If equipped, the transfer case best fuel economy. controls are used to shift into and AUTO (Automatic Four-Wheel An engagement noise and bump is out of four-wheel drive. Drive) : Use when road surface normal when shifting between 4 n To shift the transfer case, press the conditions are variable. When and 4 m or N (Neutral), with the desired button. The graphic in the driving in AUTO, the front axle is engine running. instrument cluster will flash while a engaged, and the vehicle's power is sent to the front and rear wheels GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 229 automatically based on driving The actual 4x4 shift request is only Shifting Into 4 n conditions. This setting provides made after the button is released. 1. The ignition must be on and slightly lower fuel economy than 2 m. The 4x4 graphic will remain flashing until the shift request has the vehicle must be stopped or 4 m (Four-Wheel Drive High) : Use completed. A DIC message displays moving less than 5 km/h this setting when extra traction is to indicate that the 4x4 transfer case (3 mph) with the transmission needed, such as when driving on has been requested to shift to the in N (Neutral). It is best for the snowy or icy roads, when new desired state. vehicle to be moving 1.6 to 3.2 km/h (1 to 2 mph). off-roading, or when plowing snow. Once the 4x4 shift has completed, 4 n (Four-Wheel Drive Low) : This the DIC message disappears, the 2. Press 4 n. The actual 4x4 shift setting engages the front axle and 4x4 graphic stops flashing, and the request is only made after the current setting is indicated. button is released. The 4x4 delivers extra torque. Choose 4 n graphic will remain flashing when driving off-road in deep sand, When a shift to 2 m is completed until the shift request has deep mud, or deep snow, and while successfully while in P (Park), the completed. A DIC message parking brake will engage. To climbing or descending steep hills. displays to indicate that the 4x4 resume driving, shift the transfer case has been While driving in 4 n, keep vehicle transmission to the desired gear requested to shift to the new speed below 72 km/h (45 mph). and manually release the parking desired state. brake or press the accelerator pedal Shifting into 4 n will turn Traction to begin driving. See Electric Once the 4x4 shift has completed, the DIC message Control and StabiliTrak/ESC off. Parking Brake 0 233. disappears, the 4x4 graphic See Traction Control/Electronic If equipped, use 4 n, AUTO, or 4 m to stops flashing and the current Stability Control 0 235. provide additional traction when setting is indicated. parking on a steep grade with poor Shifts between 2m, 4 m, and AUTO If vehicle speed is higher when shift traction such as ice, snow, mud, request occurs, a DIC message Any of these shifts can be made at or gravel. displays. Reduce vehicle speed. normal driving speed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

230 Driving and Operating If the transmission is not in Shifting Out of 4 n If the transmission is not in N (Neutral) when shift request N (Neutral) when shift request occurs, a DIC message displays. 1. The vehicle must be stopped or occurs, DIC messages will display. The vehicle will allow 20 seconds moving less than 5 km/h The vehicle will allow 20 seconds for the shift to occur. After this time, (3 mph) with the transmission for this shift to occur. After this time, a graphic in the instrument cluster in N (Neutral) and the ignition a graphic in the instrument cluster will indicate that the transfer case is on. It is best for the vehicle to will indicate that the transfer case is be moving in 4 . in 4 . n 1.6 to 3.2 km/h (1 to 2 mph). n Caution 2. Press 4 m, AUTO, or 2 m. The Caution actual 4x4 shift request is only Shifting the transmission into gear made after the button is Shifting the transmission into gear before the requested mode released. The 4x4 graphic will before the requested mode indicator light has stopped remain flashing until the shift indicator light has stopped flashing could damage the request has completed. A DIC flashing could damage the transfer case. message displays to indicate transfer case. the state of the request. If the transmission is not shifted into Once the 4x4 shift has If the transmission is not shifted into N (Neutral) or the vehicle has not completed, the DIC message N (Neutral) or the vehicle has not slowed to 5 km/h (3 mph) within disappears, the 4x4 graphic slowed to 5 km/h (3 mph) within 20 seconds, the transfer case will stops flashing, and the current 20 seconds, the transfer case will remain in its original state. This will setting is indicated. remain in its original state. This will be indicated in the instrument If vehicle speed is higher when be indicated in the instrument cluster. shift request occurs, a DIC cluster. With the vehicle moving less than message displays. Reduce With the vehicle moving less than 5 km/h (3 mph) and the transmission vehicle speed. 5 km/h (3 mph), and the in N (Neutral), attempt the shift transmission in N (Neutral), attempt again. the shift again. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 231 Shifting Into N (Neutral) Shifting Out of N (Neutral) Single Speed Transfer Case To shift into N (Neutral): To shift out of N (Neutral): 1. Start the vehicle. 1. Turn the ignition on with the 2. Shift the transmission to engine off. See Ignition N (Neutral). Positions (Keyless Access) 0 208 or 3. Shift the transfer case to 2 m. Ignition Positions (Key Access) 0 210. 4. Apply the parking brake and/or brake pedal. 2. Set the parking brake. See Electric Parking Brake 0 233. 5. Press 2 m five times in 3. Shift the transmission to 10 seconds until the N (Neutral) N (Neutral). graphic starts flashing in the instrument cluster. When the 4. Shift the transfer case to 2 m. If equipped, the transfer case shift is complete, the graphic Transfer case shifts out of controls are used to shift into and stops flashing. If the parking N (Neutral) can only be made out of four-wheel drive. brake and/or brake pedal is not into 2 . When the shift to 2 is applied within 20 seconds, the m m To shift the transfer case, press the transfer case will remain in the complete, the graphic in the desired button. The graphic in the original state. instrument cluster will stop instrument cluster will flash while a flashing. If the transfer case shift is in progress. The graphic 6. If the transmission is not cannot complete a shift, the displayed will change to indicate the shifted into N (Neutral) or the graphic will return to the setting requested. vehicle has not slowed to previously selected setting. 5 km/h (3 mph) within When the shift is complete the 20 seconds, the transfer case graphic will stop flashing. The DIC will remain in its original state. message turns off once the shift is This will be indicated in the complete. If the transfer case instrument cluster. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

232 Driving and Operating cannot complete a shift request, it Shifts between 2 m, 4 m, and AUTO Brakes will go back to its last chosen setting. Any of these shifts can be made at normal driving speed. Electric Brake Boost The settings are: The actual 4x4 shift request is only Vehicles equipped with electric 2 m (Two-Wheel Drive High) : Use made after the button is released. brake boost have for driving on most streets and The 4x4 graphic will remain flashing circuits that are electronically highways. The front axle is not until the shift request has controlled when the brake pedal is engaged. This setting provides the completed. A DIC message applied during normal operation. best fuel economy. displays. The system performs routine tests and turns off within a few minutes 4 m (Four-Wheel Drive High) : Use Once the 4x4 shift has completed, the DIC message disappears, the after the vehicle is shutdown. Noise this setting when extra traction is may be heard during this time. If the needed, such as when driving on 4x4 graphic stops flashing, and the current setting is indicated. brake pedal is pressed during the snowy or icy roads, when tests or when the electric brake off-roading, or when plowing snow. The actual 4x4 shift request is only boost system is off, a noticeable AUTO (Automatic Four-Wheel made after the button is released. change in pedal force and travel Drive) The 4x4 graphic will remain flashing may be felt. This is normal. until the shift request has Use when road surface conditions completed. Antilock Brake are variable. When driving in AUTO, the front axle is engaged, and the A DIC message displays. Once the System (ABS) vehicle's power is sent to the front 4x4 shift has completed, the DIC message disappears, the 4x4 The Antilock Brake System (ABS) and rear wheels automatically helps prevent a braking skid and based on driving conditions. This graphic stops flashing, and the current setting is indicated. maintain steering while setting provides slightly lower fuel braking hard. economy than 2 . m ABS performs a system check when the vehicle is first driven. A momentary motor or clicking noise GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 233 may be heard while this test is going Using ABS off. To prevent draining the battery, on, and the brake pedal may move avoid repeated cycles of the EPB Do not pump the brakes. Just hold slightly. This is normal. when the engine is not running. the brake pedal down firmly. Hearing or feeling ABS operate is The system has a Y or PARK normal. Electric Parking Brake light, and a 8 Braking in Emergencies Service Parking Brake light. See Electric Parking Brake Light 0 140 ABS allows steering and braking at and the same time. In many Service Electric Parking Brake Light emergencies, steering can help 0 140. There are also parking If there is a problem with ABS, this even more than braking. warning light stays on. See Antilock brake-related Driver Information Center (DIC) messages. Brake System (ABS) Warning Light Electric Parking Brake 0 140. Before leaving the vehicle, check for ABS does not change the time the Y or PARK light to ensure that needed to get a foot on the brake the parking brake is applied. pedal and does not always decrease stopping distance. If you EPB Apply get too close to the vehicle ahead, To apply the EPB: there will not be enough time to 1. Be sure the vehicle is at a apply the brakes if that vehicle complete stop. suddenly slows or stops. Always leave enough room ahead to stop, 2. Press the EPB switch even with ABS. momentarily. The Y or PARK light will flash and then stay on once the EPB is fully The vehicle has an Electric Parking applied. If the Y or PARK light Brake (EPB). The EPB can always flashes continuously, then the EPB be activated, even if the ignition is GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

234 Driving and Operating is only partially applied or there is a If the EPB fails to apply, block the problem with the EPB. A DIC rear wheels to prevent vehicle Caution message will display. Release the movement. EPB and try to apply it again. If the Driving with the parking brake on light does not come on, or keeps EPB Release can overheat the brake system flashing, have the vehicle serviced. To release the EPB: and cause premature wear or damage to brake system parts. Do not drive the vehicle if the Y or 1. Turn the ignition on or to ACC/ Make sure that the parking brake PARK light is flashing. See your ACCESSORY. dealer. See Electric Parking Brake is fully released and the brake Light 0 140. 2. Apply and hold the brake warning light is off before driving. pedal. 8 light is on, press the EPB If the 3. Press the EPB switch Automatic EPB Release switch and hold it. Continue to hold momentarily. the switch until the Y or PARK The EPB will automatically release if The EPB is released when the Y the vehicle is running, placed into light remains on. If the 8 light or PARK light is off. gear, and an attempt is made to remains on, see your dealer. drive away. Avoid rapid acceleration If the EPB is applied while the If the 8 light is on, release the EPB when the EPB is applied, to vehicle is moving, the vehicle will by pressing and holding the EPB preserve parking life. decelerate as long as the switch is switch. Continue to hold the switch pressed. If the switch is pressed until the Y or PARK light is off. Brake Assist until the vehicle comes to a stop, If either light stays on after release Brake Assist detects rapid brake the EPB will remain applied. is attempted, see your dealer. pedal applications due to The vehicle may automatically apply emergency braking situations and the EPB in some situations when provides additional braking to the vehicle is not moving. This is activate the Antilock Brake System normal, and is done to periodically (ABS) if the brake pedal is not check the correct operation of the pushed hard enough to activate EPB system. ABS normally. Minor noise, brake GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 235 pedal pulsation, and/or pedal When the vehicle is stopped on a Ride Control Systems movement during this time may grade, Hill Start Assist (HSA) occur. Continue to apply the brake prevents the vehicle from rolling in pedal as the driving situation an unintended direction during the Traction Control/ dictates. Brake Assist disengages transition from brake pedal release Electronic Stability when the brake pedal is released. to accelerator pedal apply. The Control brakes release when the accelerator Hill Start Assist (HSA) pedal is applied. If the accelerator System Operation pedal is not applied within a few The vehicle has a Traction Control minutes, the Electric Parking Brake { Warning System (TCS) and StabiliTrak/ will apply. The brakes may also Electronic Stability Control (ESC) release under other conditions. Do Do not rely on the HSA feature. system. These systems help limit not rely on HSA to hold the vehicle. HSA does not replace the need to wheel spin and assist the driver in pay attention and drive safely. HSA is available when the vehicle is maintaining control, especially on You may not hear or feel alerts or facing uphill in a forward gear, slippery road conditions. or when facing downhill in warnings provided by this system. TCS activates if it senses any of the R (Reverse). The vehicle must Failure to use proper care when drive wheels are spinning or come to a complete stop on a grade driving may result in injury, death, beginning to lose traction. When this for HSA to activate. or vehicle damage. See happens, TCS applies the brakes to Defensive Driving 0 187. the spinning wheels and reduces engine power to limit wheel spin. StabiliTrak/ESC activates when the vehicle senses a difference between the intended path and the direction the vehicle is actually traveling. StabiliTrak/ESC selectively applies braking pressure to any one of the vehicle wheel brakes to assist the driver in keeping the vehicle on the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

236 Driving and Operating intended path. Trailer Sway Control When the transfer case (if equipped) d comes on and stays on to (TSC) is also on automatically when is in Four-Wheel Drive Low, the indicate that the system is inactive the vehicle is started. See Trailer stability system is automatically and is not assisting the driver in Sway Control (TSC) 0 308. disabled, g comes on, and the maintaining control. The vehicle is If cruise control is being used and appropriate message will appear on safe to drive, but driving should be traction control or StabiliTrak/ESC the Driver Information Center (DIC). adjusted accordingly. begins to limit wheel spin, cruise Both traction control and StabiliTrak/ If d comes on and stays on: control will disengage. Cruise ESC are automatically disabled in control may be turned back on when this condition. 1. Stop the vehicle. road conditions allow. 2. Turn the engine off and wait Both systems come on 15 seconds. automatically when the vehicle is 3. Start the engine. started and begins to move. The systems may be heard or felt while Drive the vehicle. If d comes on they are operating or while and stays on, the vehicle may need performing diagnostic checks. This more time to diagnose the problem. is normal and does not mean there The indicator light for both systems If the condition persists, see your is a problem with the vehicle. is in the instrument cluster. This dealer. light will: It is recommended to leave both Turning the Systems Off . Flash when TCS is limiting systems on for normal driving and On conditions, but it may be necessary wheel spin. to turn TCS off if the vehicle gets . Flash when StabiliTrak/ESC is stuck in sand, mud, ice, or snow. activated. See If the Vehicle Is Stuck 0 199 and “Turning the Systems Off and . Turn on and stay on when either On” later in this section. system is not working. If either system fails to turn on or to activate, a message displays in the Driver Information Center (DIC), and GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 237 The button for TCS and StabiliTrak/ cluster, then release. The Hill Descent ESC is on the center stack. appropriate message will display in the DIC. Control (HDC) Caution To turn TCS and StabiliTrak/ESC on If equipped, Hill Descent Control (HDC) sets and maintains vehicle Do not repeatedly brake or again, press and release g. The speed while driving down steep accelerate heavily when TCS is traction off light i and the grades in a forward or reverse gear. off. The vehicle driveline could be StabiliTrak/ESC OFF light g in the The HDC switch is on the center damaged. instrument cluster turn off. stack, below the climate controls. StabiliTrak/ESC will automatically Press 5 to enable or disable HDC. To turn off only TCS, press and turn on if the vehicle exceeds Vehicle speed must be below release g. The traction off light i 56 km/h (35 mph). Traction control 50 km/h (31 mph). displays in the instrument cluster. will remain off. The appropriate message will The vehicle has a Trailer Sway display in the DIC. To turn TCS on Control (TSC) feature and a Hill again, press and release g. The Start Assist (HSA) feature. See 0 traction off light i displayed in the Trailer Sway Control (TSC) 308 or Hill Start Assist (HSA) 0 235. instrument cluster will turn off. Adding accessories can affect the When enabled, the HDC light If TCS is limiting wheel spin when g vehicle performance. See displays on the instrument cluster. is pressed, the system will not turn Accessories and Modifications off until the wheels stop spinning. 0 329. A blinking HDC light indicates the To turn off both TCS and StabiliTrak/ system is actively applying the brakes to maintain vehicle speed. ESC, press and hold until the g HDC can maintain vehicle speeds traction off light i and the between 1 and 22 km/h (1 and StabiliTrak/ESC OFF light g come 14 mph) on grades greater than or on and stay on in the instrument equal to 10%. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

238 Driving and Operating If HDC is to be used for more than If this happens, HDC will require Mode availability is dependent upon three minutes or on grades steeper time to cool down. The length of vehicle trim level, region, and than 25%, the transfer case should time HDC remains active depends optional features. be put into Four-Wheel Drive Low on road conditions, grade, set Not all drive modes are available (4 n) to reduce the possibility of speed, vehicle loading, and outside on. 1500 series vehicles may have brake overheating. temperature. Normal, Sport, Off Road, Terrain, Noise from the Electronic Brake When enabled, if the vehicle speed and Tow Haul. 2500/3500 series Control Module (EBCM) is normal is above 30 km/h (19 mph) and vehicles may have Normal, Off when HDC is active. below 60 km/h (37 mph), a DIC Road, and Tow/Haul. message will display. When HDC is activated, the initial Mode Activation HDC speed is set to the current Driver Mode Control driving speed. It can be increased or decreased by pressing +RES or This feature adds a sportier feel, SET- on the steering wheel, or by provides a more comfortable ride, applying the accelerator or brake or assists in different weather pedal. This adjusted speed conditions or terrain. Depending on becomes the new set speed. the option package, available features, and mode selected; the HDC will remain enabled between suspension, steering, and 30 and 60 km/h (19 and 37 mph); powertrain will change settings to however, vehicle speed cannot be achieve the desired mode set or maintained in this range. HDC characteristics. If the vehicle is will automatically disable if the equipped with magnetic ride control, vehicle speed is above 80 km/h selecting the various Driver Modes (50 mph) or above 60 km/h enhances the ride performance for To activate and deactivate Tow/Haul (37 mph) for at least 30 seconds. the road conditions and the turn the Drive Mode knob to the left. 5 must be pressed again to selected mode. For activation of modes other than re-enable HDC. HDC may disable Tow/Haul, turn the Drive Mode knob after an extended period of use. to the right. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 239 When you enter this mode you will immediately feel a down shift. In this mode, the vehicle also monitors driving behaviors and automatically enables Performance Shift Features when spirited driving is detected. These features maintain lower transmission gears to increase available and improve acceleration response. The vehicle will exit these features and return to normal operation after a short period when no spirited driving Vehicles with the MODE graphic on If equipped, select Terrain Mode by is detected. The steering will the knob will have a menu selection pressing the g below the 4 m change to provide more precise screen in the instrument cluster to transfer case button. control. If the vehicle has Magnetic select the desired mode. When the Ride Control, the suspension will Drive Mode knob is turned to the Modes: change to provide better cornering right, the mode list will display and Normal Mode : Use for normal city performance. activate the next available mode. and highway driving to provide a When selected, the Sport Mode light smooth, soft ride. This mode displays in the instrument cluster. provides a balanced setting between comfort and handling. This 7 Off-Road Mode : Use to is the standard mode and when improve driving at moderate speeds, selected, there is no indicator in the on grass, gravel, dirt, unpaved instrument cluster. roads, or snow-covered roads that have not been groomed or plowed. 8 Sport Mode : Use where road conditions or personal preference The accelerator pedal will be more demand a more controlled sensitive to provide finer control of response. the torque at the wheels. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

240 Driving and Operating StabiliTrak/Electronic Stability . In busy parking lots where Use when: Control (ESC), the Antilock Brake improved low speed control of . Traveling on very rough roads at System (ABS), and the Traction the vehicle is desired very low speeds, such as a Control System (TCS) will change Operating the vehicle in Tow/Haul two-track or heavily rutted road. for optimal off-road performance. Mode when lightly loaded or with no . Traveling slowly in grassy fields. Use this mode for public off-road trailer at all will not cause damage. recreational driving. See Off-Road . Pulling a boat out of the water 0 However, there is no benefit to Driving 191. selecting Tow/Haul Mode when the on a trailer. When selected, the Off-Road Mode vehicle is unloaded. Such a . Using the vehicle for public indicator light displays in the selection when unloaded may result off-road recreational driving. See instrument cluster. in unpleasant engine and Off-Road Driving 0 191 and _ Tow/Haul Mode : This feature transmission driving characteristics, Hill and Mountain Roads 0 197. assists when pulling a heavy trailer heavy or light steering, and reduced fuel economy. When in Terrain Mode, the vehicle or a heavy load. See Tow/Haul will shift automatically but may hold 0 Mode 227. When selected, the Tow/Haul Mode a lower gear longer to maximize Tow/Haul Mode is designed to be light will display in the instrument engine torque. The steering will most effective when the vehicle and cluster. change to provide more precise trailer combined weight is at least If the vehicle is turned off with Tow/ control. A unique pedal map, 75% of the vehicle’s Gross Haul Mode active and then restarted transmission shift pattern, and rpm Combined Weight Rating (GCWR). within four hours or less, Tow/Haul control are utilized to give better See “Weight of the Trailer” under will remain active. Otherwise the control at lower speeds and over Trailer Towing 0 292. vehicle will start in Normal Mode. rough terrain. When the vehicle g comes to a stop, Vehicle Hold is Tow/Haul Mode is most useful when Terrain Mode : Use for finer engaged. TCS will be optimized for pulling a heavy trailer or a heavy control during low speed, off-road maximum torque transfer across load under the following conditions: driving. When using this mode it will axles, and Active Braking During Lift . Through rolling terrain mimic the characteristics of Throttle will be engaged. four-wheel-drive low (4 n) without . In stop-and-go traffic the torque capabilities. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 241

Active Braking During Lift Throttle: Terrain Mode . Automatically applies light Drive Select Expected Vehicle Behavior Ideal Terrain braking, similar to heavy engine Minor deceleration when off braking of four-wheel-drive low. Grassy fields, throttle and mild ability to mild two tracks, . Applies light braking in D (Drive) Drive (L3-Lx) modulate throttle; mimics rutted roads, until the vehicle is at idle performance of 4 without n large rolling hills, speeds. In Manual L1 and torque multiplication. Manual L2, moderate braking Moderate deceleration when may stop the vehicle. off throttle and moderate Mild rock crawling, . Reduces trailer braking. L2 ability to modulate throttle; heavy ruts, will bring vehicle to a stop in short, steeper grades, most cases. Significant deceleration when off throttle and significant L1 ability to modulate throttle; Rock crawling downhill will bring vehicle to a stop in most cases.

Active Braking During Lift Throttle Vehicle Hold Features: will reduce the back and forth . When the vehicle comes to a between the accelerator and brake stop on an incline grade in pedals. forward gear or on a decline grade in reverse gear, Vehicle Hold is engaged until the accelerator pedal is pressed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

242 Driving and Operating . When the vehicle is in forward The vehicle will automatically exit Locking Rear Axle gear on a decline, the vehicle is the mode if the brakes get too hot. allowed to creep down the hill Terrain Mode can be turned back on Vehicles with a locking rear axle can when the brake pedal is after the brakes have cooled. give more traction on snow, mud, ice, sand, or gravel. It works like a released without pressing the When Terrain Mode is selected: accelerator pedal. The vehicle standard axle most of the time, but will also creep forward on flat . Auto Engine Start/Stop will be when traction is low, this feature will ground. disabled. allow the rear wheel with the most traction to move the vehicle. . If the driver seat belt is removed . The Terrain Mode indicator and the driver door is opened displays on the instrument while the vehicle is being held, cluster. EPB will be engaged. . EPB will engage if the vehicle is Limited-Slip Differential held for an extended period. If equipped, the limited-slip Terrain Mode is only available on differential can give more traction on vehicles equipped with the single snow, mud, ice, sand, or gravel. speed transfer case. It works like a standard axle most of the time, but when traction is low, Terrain Mode can only be this feature allows the active when: with the most traction to move the . Vehicle speed is less than vehicle. For vehicles with the 80 km/h (50 mph). limited-slip differential, driven under severe conditions, the rear axle fluid . The transfer case is in 4 m. should be changed. See 0 Frequent use of this mode may Maintenance Schedule 441. cause brake wear due to the light braking. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 243 Cruise Control will automatically disengage. See 5 : Press to turn cruise control on Traction Control/Electronic Stability or off. A white indicator comes on or Control 0 235. If a collision alert off in the instrument cluster. { Warning occurs when cruise control is activated, cruise control is +RES : If there is a set speed in Cruise control can be dangerous disengaged. See Forward Collision memory, press the control up briefly where you cannot drive safely at Alert (FCA) System 0 268. When to resume to that speed or press a steady speed. Do not use road conditions allow you to safely and hold to accelerate. If cruise cruise control on winding roads or use it again, cruise control can be control is already engaged, use to in heavy traffic. turned back on. increase vehicle speed. Cruise control can be dangerous Turning off the TCS or StabiliTrak/ SET− : Press the control down on slippery roads. On such roads, ESC system will disengage the briefly to set the speed and activate fast changes in tire traction can cruise control. cruise control. If cruise control is cause excessive wheel slip, and already engaged, use to decrease If the brakes are applied, cruise vehicle speed. you could lose control. Do not use control disengages. cruise control on slippery roads. * : Press to disengage cruise control without erasing the set speed from memory. If equipped with cruise control, a speed of about 40 km/h (25 mph) or Setting Cruise Control more can be maintained without keeping your foot on the If 5 is on when not in use, SET− or accelerator. Cruise control does not +RES could get pressed and go into work at speeds below about cruise when not desired. Keep 5 40 km/h (25 mph). off when cruise is not being used. If the cruise control is being used 1. Press 5 to turn the cruise and the Traction Control System system on. (TCS) or StabiliTrak/Electronic Stability Control (ESC) begins to 2. Get up to the desired speed. limit wheel spin, the cruise control GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

244 Driving and Operating 3. Press and release SET−. . To increase vehicle speed in Passing Another Vehicle While 4. Remove your foot from the small increments, press +RES Using Cruise Control accelerator. up briefly. For each press, the Use the accelerator pedal to vehicle goes about 1 km/h increase the vehicle speed. When The cruise control indicator on the (1 mph) faster. instrument cluster turns green after you take your foot off the pedal, the cruise control has been set to the The speedometer reading can be vehicle will slow down to the displayed in either English or metric previously set cruise speed. While desired speed. See Instrument 0 Cluster 0 126. units. See Instrument Cluster 126. pressing the accelerator pedal or The increment value used depends shortly following the release to Resuming a Set Speed on the units displayed. override cruise control, briefly If the cruise control is set at a pressing SET– will result in cruise Reducing Speed While Using control set to the current vehicle desired speed and then the brakes Cruise Control * speed. are applied or is pressed, the Do one of the following: cruise control is disengaged without Using Cruise Control on Hills erasing the set speed from memory. . Press and hold SET– down until the desired lower speed is How well the cruise control works Once the vehicle reaches about reached, then release it. on hills depends on the vehicle 40 km/h (25 mph) or more, press speed, the load, and the steepness RES+ up briefly. The vehicle returns . To slow down in small of the hills. When going up steep to the previously set speed. increments, press SET– down hills, pressing the accelerator pedal briefly. For each press, the may be necessary to maintain Increasing Speed While Using vehicle goes about 1 km/h vehicle speed. Cruise Control (1 mph) slower. While going downhill, cruise braking Do one of the following: The speedometer reading can be helps maintain driver selected . Press and hold +RES up until displayed in either English or metric speed. units. See Instrument Cluster 0 126. the desired speed is reached, Cruise Grade Braking is enabled then release it. The increment value used depends on the units displayed. when the vehicle is started and cruise control is active. It is not enabled in Range Selection Mode. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 245 It assists in maintaining driver Adaptive Cruise Control used, ACC can be turned back on. selected speed when driving on Disabling the TCS or StabiliTrak/ downhill grades by using the engine (1500 Series) ESC system will disengage and and transmission to slow the If equipped, Adaptive Cruise Control prevent engagement of ACC. vehicle. (ACC) allows the cruise control set ACC can reduce the need for you to For other forms of descent control, speed and following gap to be frequently brake and accelerate, see Hill Descent Control (HDC) selected. Read this entire section especially when used on 0 237, Automatic Transmission before using this system. The expressways, freeways, and 0 221, and Tow/Haul Mode 0 227. following gap is the following time interstate highways. When used on between your vehicle and a vehicle other roads, you may need to take Ending Cruise Control detected directly ahead in your path, over the control of braking or There are four ways to end cruise moving in the same direction. If no acceleration more often. control: vehicle is detected in your path, ACC works like regular cruise . Step lightly on the brake pedal. control. ACC uses a windshield { Warning mounted front camera sensor. . Press *. ACC has limited braking ability If a vehicle is detected in your path, . Shift the transmission to and may not have time to slow ACC can apply acceleration or N (Neutral). the vehicle down enough to avoid limited, moderate braking to a collision with another vehicle . To turn off cruise control, maintain the selected following gap. you are following. This can occur press 5. To disengage ACC, apply the brake. when vehicles suddenly slow or If ACC is controlling the vehicle stop ahead, or enter your lane. Erasing Speed Memory speed when the Traction Control Also see “Alerting the Driver” later The cruise control set speed is System (TCS) or StabiliTrak/ in this section. Complete attention Electronic Stability Control (ESC) erased from memory if 5 is pressed is always required while driving system activates, ACC may or the ignition is turned off. and you should be ready to take automatically disengage. See Traction Control/Electronic Stability action and apply the brakes. See 0 Control 0 235. When road Defensive Driving 187. conditions allow ACC to be safely GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

246 Driving and Operating J : Press to turn the system on or { Warning Warning (Continued) off. The indicator turns white on the ACC will not detect or brake for . On slippery roads where instrument cluster when ACC is children, pedestrians, animals, fast changes in tire traction turned on. or other objects. can cause excessive RES+ : Press briefly to resume the wheel slip previous set speed or to increase Do not use ACC when: . With extremely heavy cargo vehicle speed if ACC is already . On winding and hilly roads loaded in the cargo area or activated. To increase speed by or when the camera sensor rear seat about 1 km/h (1 mph), press RES+ is blocked by snow, ice, briefly. To increase speed to the or dirt. The system may not . When towing a trailer next 5 km/h (5 mph) mark on the detect a vehicle ahead. speedometer, hold RES+. Keep the windshield and SET : Press briefly to set the headlamps clean. – speed and activate ACC or to . When visibility is poor due decrease vehicle speed if ACC is to rain, snow, fog, dirt, already activated. To decrease insect residue, or dust; speed by about 1 km/h (1 mph), when other foreign objects press SET– briefly. To decrease obscure the camera’s view; speed to the next 5 km/h (5 mph) or when the vehicle in front mark on the speedometer, or oncoming traffic causes hold SET–. additional environmental * : Press to disengage ACC obstructions, such as road without erasing the selected set spray. ACC performance is speed. limited under these conditions. [ : Press to select a following gap (Continued) setting for ACC of Far, Medium, or Near. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 247 The speedometer reading can be indicator will be lit on the instrument Setting Adaptive Cruise Control displayed in either English or metric cluster; the following gap will not units. See Instrument Cluster 0 126. display. If J is on when not in use, SET–/ The increment value used depends RES+ could be pressed by mistake When the vehicle is turned on, the and engage ACC when not desired. on the units displayed. cruise control mode will be set to Keep J off when cruise is not Switching Between ACC and the last mode used before the being used. Regular Cruise Control vehicle was turned off. Select the set speed desired for To switch between ACC and regular { Warning ACC. This is the vehicle speed cruise control, press and hold *. when no vehicle is detected in A Driver Information Display (DIC) Always check the cruise control your path. message displays. See Vehicle indicator on the instrument cluster Messages 0 155. While the vehicle is moving, ACC to determine which mode cruise will not set at a speed less than 25 control is in before using the km/h (15 mph), although it can be feature. If ACC is not active, the resumed when driving at lower vehicle will not automatically speeds. brake for other vehicles, which To set ACC while moving: could cause a crash if the brakes ACC Indicator Regular Cruise are not applied manually. You and 1. Press J. others could be seriously injured Control Indicator 2. Get up to the desired speed. or killed. 3. Press and release SET–. When ACC is engaged, a green o indicator will be lit on the instrument 4. Remove foot from the cluster and the following gap will be accelerator. displayed. When the regular cruise After ACC is set, it may immediately control is engaged, a green J apply the brakes if a vehicle ahead is detected closer than the selected following gap. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

248 Driving and Operating ACC can also be set while the A green ACC indicator and the set When the accelerator pedal is vehicle is stopped if ACC is on and speed display on the instrument pressed, ACC will not brake the brake pedal is applied. cluster. The vehicle ahead indicator because it is overridden. The may be flashing if a vehicle ahead ACC indicator will turn blue on was present and moved. See the instrument cluster. “Approaching and Following a . Press and hold RES+ until the Vehicle” later in this section. desired set speed is displayed, Once ACC has resumed, if there is then release it. no vehicle ahead, if the vehicle . To increase vehicle speed in ahead is beyond the selected smaller increments, press RES+ The ACC indicator displays on the following gap, or if the vehicle has briefly. For each press, the instrument cluster. When ACC is exited a sharp curve, then the vehicle goes about 1 km/h turned on, the indicator will be lit vehicle speed will increase to the (1 mph) faster. white. set speed. . To increase vehicle speed in Be mindful of speed limits, Increasing Speed While ACC Is at larger increments, hold RES+. surrounding traffic speeds, and a Set Speed While holding RES+, the vehicle weather conditions when selecting speed increases to the next the set speed. If ACC is already activated, do one of the following: 5 km/h (5 mph) step, then Resuming a Set Speed continues to increase by 5 km/h . Use the accelerator to get to the (5 mph) at a time. If the ACC is set at a desired speed higher speed. Press SET–. and then the brakes are applied, Release SET– and the The set speed can also be ACC is disengaged without erasing accelerator pedal. The vehicle increased while the vehicle is the set speed from memory. will now cruise at the higher stopped. To begin using ACC again, press speed. . If stopped with the brake pedal RES+ briefly while moving more applied, press RES+ until the than 5 km/h (5 mph). The vehicle desired set speed is displayed. returns to the previous set speed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 249 . Pressing RES+ when there is no . To decrease the vehicle speed in When pressed, the current gap longer a vehicle ahead or the larger increments, hold SET−. setting displays briefly on the vehicle ahead is pulling away While holding SET−, the vehicle instrument cluster. The gap setting and the brake is not applied with speed decreases to the next will be maintained until it is cause the ACC to resume. 5 km/h (5 mph) step, then changed. When it is determined that there is continues to decrease by 5 km/h Since each gap setting corresponds no vehicle ahead or the vehicle (5 mph) at a time. to a following time (Far, Medium, ahead is beyond the selected The set speed can also be or Near), the following distance will following gap, then the vehicle decreased while the vehicle is vary based on vehicle speed. The speed will increase to the set speed. stopped. faster the vehicle speed, the further . If stopped with the brake back your vehicle will follow a Reducing Speed While ACC Is at a vehicle detected ahead. Consider Set Speed applied, press or hold SET− until the desired set speed is traffic and weather conditions when If ACC is already activated, do one displayed. selecting the following gap. The of the following: range of selectable gaps may not be . Use the brake to get to the Selecting the Follow Distance Gap appropriate for all drivers and desired lower speed. Release When a slower moving vehicle is driving conditions. the brake and press SET–. The detected ahead within the selected Changing the gap setting vehicle will now cruise at the following gap, ACC will adjust the automatically changes the alert lower speed. vehicle's speed and attempt to timing sensitivity (Far, Medium, maintain the follow distance gap or Near) for the Forward Collision . Press and hold SET– until the desired lower speed is reached, selected. Alert (FCA) feature. See Forward Collision Alert (FCA) System 0 268. then release it. Press [ on the steering wheel to . To decrease the vehicle speed in adjust the following gap. Each press smaller increments, press SET− cycles the gap button through three briefly. For each press, the settings: Far, Medium, or Near. vehicle goes about 1 km/h (1 mph) slower. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

250 Driving and Operating Alerting the Driver Approaching and Following a may feel or sound different than if Vehicle the brakes were applied manually. This is normal. Stationary or Very Slow-Moving Objects

{ Warning With Head-Up Display ACC may not detect and react to The vehicle ahead indicator is in the stopped or slow-moving vehicles instrument cluster. It only displays ahead of you. For example, the when a vehicle is detected in your system may not brake for a vehicle s path moving in the same ’ vehicle it has never detected direction. If this symbol is not displaying, ACC will not respond to moving. This can occur in or brake for vehicles ahead. stop-and-go traffic or when a Without Head-Up Display vehicle suddenly appears due to If ACC is engaged, driver action ACC automatically slows the vehicle a vehicle ahead changing lanes. may be required when ACC cannot down and adjusts vehicle speed to Your vehicle may not stop and apply sufficient braking because of follow a detected vehicle ahead at could cause a crash. Use caution approaching a vehicle too rapidly. the selected following gap. The when using ACC. Your complete vehicle speed increases or attention is always required while When this condition occurs, six red decreases to follow a detected driving and you should be ready lights will flash on the windshield. vehicle in front of your vehicle when Either eight beeps will sound from that vehicle is traveling slower than to take action and apply the the front, or both sides of the Safety your vehicle set speed. It may apply brakes. Alert Seat will pulse five times. See limited braking, if necessary. When “Collision/Detection Systems” under braking is active, the brake lamps 0 Vehicle Personalization 156. will come on. The automatic braking See Defensive Driving 0 187. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 251 Irregular Objects Affecting ACC In some cases, when ACC is ACC may have difficulty detecting temporarily unavailable, regular the following objects: cruise control may be used. See “Switching Between ACC and . Vehicles in front of your vehicle Regular Cruise Control” previously that have a rear aspect that is in this section. Always consider low, small, or irregular driving conditions before using . An empty truck or trailer that has either cruise control system. no cargo in the cargo bed Notification to Resume ACC ACC Automatically Disengages . Vehicles with cargo extending ACC will maintain a follow gap ACC may automatically disengage from the back end behind a detected vehicle and slow and the driver will need to manually your vehicle to a stop behind that . Non-standard shaped vehicles, apply the brakes to slow the vehicle. such as vehicle transport, vehicle if: vehicles with a side car fitted, If the stopped vehicle ahead has . The front camera is blocked or or horse carriages driven away and ACC has not visibility is reduced. . Vehicles that are low to the road resumed, the vehicle ahead surface . The Traction Control System indicator will flash as a reminder to (TCS) or StabiliTrak/ESC system check traffic ahead before . Objects that are close to the has activated or been disabled. proceeding. In addition, the left and front of your vehicle . There is a fault in the system. right sides of the Safety Alert Seat . Vehicles on which extremely will pulse three times, or three heavy cargo is loaded in the . A DIC message displays to beeps will sound. See ”Alert Type” cargo area or rear seat indicate that ACC is temporarily and “Adaptive Cruise Go Notifier” in unavailable. “Collision/Detection Systems” under The ACC indicator will turn white Vehicle Personalization 0 156. when ACC is no longer active. When the vehicle ahead drives away, press RES+ or the accelerator pedal to resume ACC. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

252 Driving and Operating If stopped for more than Curves in the Road two minutes or if the driver door is { Warning opened and the driver seat belt is { Warning unbuckled, the ACC automatically Leaving the vehicle without applies the Electric Parking Brake placing it in P (Park) can be On curves, ACC may not detect a (EPB) to hold the vehicle. The EPB dangerous. Do not leave the vehicle ahead in your lane. You status light will turn on. See Electric vehicle while it is being held at a could be startled if the vehicle Parking Brake 0 233. stop by ACC. Always place the accelerates up to the set speed, vehicle in P (Park) and turn off A DIC warning message may especially when following a the ignition before leaving the display indicating to shift to P (Park) vehicle exiting or entering exit vehicle. before exiting the vehicle. See ramps. You could lose control of Vehicle Messages 0 155. the vehicle or crash. Do not use ACC Override ACC while driving on an entrance { Warning If using the accelerator pedal while or exit ramp. Always be ready to ACC is active, the ACC indicator use the brakes if necessary. If ACC has stopped the vehicle, turns blue on the instrument cluster and if ACC is disengaged, turned indicating ACC braking will not off, or canceled, the vehicle will occur. ACC will resume operation { Warning no longer be held at a stop. The when the accelerator pedal is not vehicle can move. When ACC is being pressed. On curves, ACC may respond to holding the vehicle at a stop, a vehicle in another lane, or may always be prepared to manually { Warning not have time to react to a vehicle apply the brakes. in your lane. You could crash into The ACC will not automatically a vehicle ahead of you, or lose apply the brakes if your foot is control of your vehicle. Give extra resting on the accelerator pedal. attention in curves and be ready You could crash into a vehicle ahead of you. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 253 Other Vehicle Lane Changes Warning (Continued)

to use the brakes if necessary. Select an appropriate speed while driving in curves.

ACC may operate differently in a sharp curve. It may reduce the vehicle speed if the curve is too ACC may detect a vehicle that is sharp. not in your lane and apply the brakes. ACC will not detect a vehicle ahead ACC may occasionally provide an until it is completely in the lane. The alert and/or braking that is brakes may need to be manually considered unnecessary. It could applied. respond to vehicles in different Objects Not Directly in Front of lanes or stationary objects when Your Vehicle entering or exiting a curve. This is normal operation. The vehicle does The detection of objects in front of not need service. the vehicle may not be possible if: . The vehicle or object ahead is When following a vehicle and not within your lane. entering a curve, ACC may not detect the vehicle ahead and . The vehicle ahead is shifted, not accelerate to the set speed. When centered, or is shifted to one this happens, the vehicle ahead side of the lane. indicator will not appear. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

254 Driving and Operating Driving in Narrow Lanes . Press *. Lighting Conditions Affecting ACC Vehicles in adjacent traffic lanes or The ACC front camera can be . Press . roadside objects may be incorrectly J affected by poor lighting conditions, detected when located along the Erasing Speed Memory and ACC may have limited roadway. performance when: The ACC set speed is erased from Do Not Use ACC on Hills and memory if J is pressed or if the . There are changes in brightness, such as entering and exiting When Towing a Trailer ignition is turned off. tunnels, bridges, and Weather Conditions Affecting ACC overpasses. If the interior temperature is . Low sun angles cause the extremely high, the instrument camera to not detect objects, cluster may indicate that ACC is or it is more difficult to detect temporarily unavailable. This can be objects in the same traffic lane. caused by extreme hot weather . Lighting is poor in the evening or conditions with direct sunlight on the early morning front camera. ACC will return to normal operation once the cabin . There are multiple changes in Do not use ACC when driving on temperature is lower. brightness or shadows along the steep hills or when towing a trailer. vehicle roadway. Conditions that are associated with ACC will not detect a vehicle in the low visibility, such as fog, rain, . In a tunnel without the lane while driving on steep hills. snow, or road spray, may limit ACC headlamps on, or in a tunnel If the brakes are applied, ACC performance. Water droplets from when there is a vehicle in front disengages. rain or snow that remain on the that does not have its Disengaging ACC windshield may also limit ACC’s taillamps on. There are three ways to ability to detect objects. disengage ACC: . Step lightly on the brake pedal. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 255 . Subjected to strong light from The vehicle headlamps may need to Driver Assistance opposing lane traffic in the front be cleaned due to dirt, snow, or ice. of the vehicle, such as Objects that are not illuminated Systems high-beam headlamps from correctly may be difficult to detect. This vehicle may have features that oncoming traffic. If ACC will not operate, regular work together to help avoid crashes Accessory Installations and cruise control may be available. See or reduce crash damage while Vehicle Modifications “Switching Between ACC and driving, backing, and parking. Read Regular Cruise Control previously this entire section before using Do not install or place any object ” in this section. Always consider these systems. around the front camera windshield driving conditions before using area that would obstruct the front either cruise control system. camera view. { Warning For cleaning instructions, see Do not install objects on top of the “Washing the Vehicle” under Do not rely on the Driver vehicle that and obstruct Exterior Care 0 429. Assistance Systems. These the front camera, such as a canoe, systems do not replace the need kayak, or other items that can be for paying attention and driving transported on the vehicle roof. safely. You may not hear or feel Do not modify the hood, headlamps, alerts or warnings provided by or fog lamps, as this may limit the these systems. Failure to use camera’s ability to detect an object. proper care when driving may Cleaning the Sensing System result in injury, death, or vehicle damage. See Defensive Driving The camera sensor on the 0 187. windshield behind the rearview mirror can become blocked by Under many conditions, these snow, ice, dirt, mud, or debris. This systems will not: area needs to be cleaned for ACC (Continued) to operate properly. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

256 Driving and Operating Information Center (DIC) messages Warning (Continued) Warning (Continued) may display when the systems are unavailable or blocked. . Detect children, Complete attention is always pedestrians, bicyclists, required while driving, and you or animals. should be ready to take action . Detect vehicles or objects and apply the brakes and/or steer outside the area monitored the vehicle to avoid crashes. by the system. . Work at all driving speeds. Audible or Safety Alert Seat . Warn you or provide you Some driver assistance features with enough time to avoid a alert the driver of obstacles by crash. beeping. To change the volume of the warning chime, see “Comfort . Work under poor visibility or and Convenience” under Vehicle bad weather conditions. Personalization 0 156. . Work if the detection sensor If equipped with the Safety Alert is not cleaned or is covered Seat, the driver seat cushion may by ice, snow, mud, or dirt. provide a vibrating pulse alert . Work if the detection sensor instead of beeping. To change this, is covered up, such as with see “Collision/Detection Systems” a sticker, magnet, or metal under Vehicle Personalization plate. 0 156. . Work if the area surrounding Cleaning the detection sensor is damaged or not properly Depending on vehicle options, keep repaired. these areas of the vehicle clean to ensure the best driver assistance (Continued) feature performance. Driver GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 257 . Front and rear bumpers and the avoid objects. Always check around area below the bumpers the vehicle when parking or . Front and headlamps backing. . Front camera lens in the front The RVC, RPA, and Surround grille or near the front emblem Vision will not work properly if the tailgate is down. If the tailgate is . Front side and rear side panels down, do not use these systems. . Outside of the windshield in front Rear Vision Camera (RVC) of the rearview mirror When the vehicle is shifted into . Side camera lens on the bottom R (Reverse), the RVC displays an of the outside mirrors image of the area behind the vehicle . Rear side corner bumpers in the infotainment display. The 1. View Displayed by the Rear previous screen displays when the . Rear Vision Camera in the Vision Camera vehicle is shifted out of R (Reverse) tailgate handle after a short delay. To return to the . Rear Camera Mirror and Cargo previous screen sooner, press any View Camera in the Center button on the infotainment system, High-Mounted Stoplamp shift into P (Park), or, while in D (Drive), reach a vehicle speed of Assistance Systems for approximately 12 km/h (8 mph). The Parking or Backing rear vision camera is in the tailgate handle. If equipped, the Rear Vision Camera (RVC), Surround Vision, Rear Park Assist (RPA), Front Park Assist 1. View Displayed by the Rear (FPA), and Rear Cross Traffic Alert Vision Camera (RCTA) may help the driver park or 2. Corners of the Rear Bumper GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

258 Driving and Operating Displayed images may be farther or closer than they appear. The area { Warning displayed is limited and objects that are close to either corner of the The Surround Vision cameras bumper or under the bumper do not have blind spots and will not display. display all objects near the corners of the vehicle. Folding A warning triangle may display to outside mirrors that are out of show that Rear Park Assist (RPA) position may not display surround has detected an object. This triangle view correctly. Always check changes from amber to red and 1. Views Displayed by the around the vehicle when parking increases in size the closer the Surround Vision Cameras object. or backing. 2. Area Not Shown If equipped with Hitch View, see “Surround Vision” following. { Warning Surround Vision The camera(s) do not display If equipped the Surround Vision children, pedestrians, bicyclists, system can display various views crossing traffic, animals, or any surrounding the vehicle in the other object outside of the infotainment display. See below for cameras’ field of view, below the camera view descriptions and more bumper, or under the vehicle. information. Shown distances may be different from actual distances. Do not 1. Views Displayed by the drive or park the vehicle using Surround Vision Cameras only these camera(s). Always 2. Area Not Shown check behind and around the (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 259 1. Front/Rear Standard View on the infotainment display Warning (Continued) Displays an image of the when a camera view is active. Touch the button to vehicle before driving. Failure to area in front or behind the vehicle. To select, touch toggle between front and use proper care may result in rear camera views. injury, death, or vehicle damage. Front/Rear Standard View on the infotainment display 3. Rear Bowl View when a camera view is Displays a perspective view Camera Views active. Touch the button to of the vehicle from the front toggle between front and looking rearward. To select, rear camera views. touch Rear Bowl View on When the hitch guidance is the infotainment display selected, Rear Standard when a camera view is View will remain visible active. Park Assist and across gear changes, Rear Cross Traffic Alert otherwise the view will (RCTA) overlays are not toggle between Front and available when bowl view is Rear Standard View based active. on gear position. 4. Front/Rear side View If equipped, the front view Displays a view that shows camera also displays when objects next to the front or rear sides of the vehicle. To Touch the camera view buttons the Park Assist system select, touch Front/Rear along the bottom of the infotainment detects an object within Side View on the display to access each view (if 30 cm (12 in). infotainment display when a equipped): 2. Front/Rear Overhead View camera view is active. Displays a front or rear Touch the button to toggle overhead view of the between front and rear vehicle. To select, touch camera views. Park Assist Front/Rear Top-Down View GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

260 Driving and Operating and RCTA overlays are not Side Views. In these views Hitch Guidance displays a available when Front/Rear Surround View can be single centered guideline Side View is active. enabled by touching on the infotainment display The Turn Signal Activated Surround View on the to assist with aligning the View works with Rear Side infotainment display when vehicle’s hitch ball with a View to provide a rearward the camera view is active. trailer coupler. Touch the view of the left or right side 6. Guidance Lines/Hitch Hitch Guidance icon, then of the vehicle and trailer. Guidance align the trailer guidance line over the trailer coupler. Views are provided based Guidance Lines displays Continuously steer the on turn signal activation available guidelines, vehicle to keep the with the right-side view including Standard and guideline centered on the being shown when the right Hitch Guidance. coupler when backing. Park turn signal is active and the A grayed-out icon indicates Assist overlays will not left side view being shown that guidelines are not display when the trailer when the left turn signal is available. To enable, touch guidance line is active. active. The feature is Guidance Lines on the Hitch Guidance is available available when a trailer is infotainment display when a in Rear Standard View. connected. The feature can camera view is active. be enabled or disabled. Touching the button See Vehicle Personalization multiple times will toggle { Warning 0 156. Touch X to exit. through Standard 5. Surround View Guidelines, Hitch Guidance Use Hitch Guidance only to help back the vehicle to a trailer hitch Displays an image of the and no guidelines. Standard guidelines are or, when traveling above 12 km/h area surrounding the (8 mph), to briefly check the vehicle. Surround View is available in Front/Rear Standard Views, Front/Rear status of your trailer. Do not use available as part of the for any other purpose, such as Front/Rear Standard Views, Top-Down Views and making lane change decisions. the Front/Rear Top-Down Surround View. Views and the Front/Rear (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 261 touch CAMERA on the will automatically engage Warning (Continued) infotainment display and the Electric Parking touch the Interior Trailer Brake (EPB). Before making a lane change, View icon. The view will 9. Bed View always check the mirrors and close after 8 seconds and Provides a view of the truck glance over your shoulder. can be closed early by bed and the area behind Improper use could result in touching X. serious injury to you or others. the vehicle to assist in 8. Hitch View cargo or hitch monitoring or Assists with connecting to a hitching to a fifth wheel or 7. Interior Trailer View trailer by providing a gooseneck trailer. To select, Provides a view of the zoomed-in view of the hitch touch Bed View on the interior of the trailer. The to help align the vehicle’s infotainment display when a feature is available when a hitch ball with the trailer camera view is active. To trailer is connected. The coupler, or to monitor the access this view when in a feature requires user trailer connection. To select, forward gear above 12 km/h installation of an accessory touch Hitch View on the (8 mph), touch CAMERA on trailer camera on the infotainment display when a the infotainment display interior of the trailer per the camera view is active. To and touch the Bed View accessory trailer camera access this view when in a icon. The view will close installation instructions (see forward gear above 12 km/h after 8 seconds and can be your dealer for accessory (8 mph), touch CAMERA on closed early by touching X. trailer camera(s) and the infotainment display 10. Transparent Trailer View and touch the Cargo Bed information). To select, Provides a view that allows View icon. The view will touch Interior Trailer View the driver to virtually see close after 8 seconds and “ on the infotainment display through the trailer. The can be closed early by ” when a camera view is feature is available when a touching X. Shifting into active. To access this view compatible trailer is P (Park) while in this view when in a forward gear connected and a profile is above 12 km/h (8 mph), configured and selected via GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

262 Driving and Operating the Trailering App. See Trailer View. The trailer per the accessory Trailering App 0 310. The Transparent Trailer View is trailer camera feature requires user shown when the position of installation instructions installation of an accessory the trailer is relatively (see your dealer for trailer camera on the rear straight behind the vehicle. accessory trailer exterior surface of the The Left or Right camera(s) and trailer per the accessory Transparent Trailer View is information). To select, trailer camera installation shown when the position of touch Rear Trailer View/ instructions (see your the trailer is too far to the Rear Side View with dealer for accessory trailer left or right. When the Available Articulation camera(s) and information). system is not calibrated or Functionality/ To select, touch trailer position is not known Picture-in-Pictue Side Transparent Trailer View on the Transparent Trailer View on the the infotainment display Picture-in-Picture View will infotainment display when a camera view is be shown. when a camera view is active. To access this view 11. Rear Trailer View/Rear Side active. Each touch will when in a forward gear View with Available toggle through the Rear above 12 km/h (8 mph), Articulation Functionality/ Trailer View, Trailer Tow touch CAMERA on the Picture-in-Picture Side View Mirror View and Combo infotainment display and View. To access this . Rear Trailer View touch the Transparent view when in a forward provides a view of the Trailer View icon. Touch X gear above 12 km/h area behind the trailer. to exit. (8 mph), touch the feature is available CAMERA on the When the system is when a trailer is infotainment display and calibrated and the trailer connected. The feature touch the Interior Rear position is known, one of requires user installation Trailer View/Rear Side three views will be shown; of an accessory trailer View with Available Transparent Trailer View, camera on the rear Articulation Left Transparent Trailer exterior surface of the View or Right Transparent Functionality/ GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 263 Picture-in-Picture Side View. To access this accessory trailer View icon. Touch X view when in a forward camera(s) and to exit. gear above 12 km/h information). To select, . Rear Side View with (8 mph), Touch touch Rear Trailer View/ Available Articulation CAMERA on the Rear Side View with Functionality provides a infotainment display and Available Articulation rearward split view of touch the Rear Trailer Functionality/ the left and right sides View/Rear Side View Picture-in-Picture Side of the vehicle and trailer. with Available view on the infotainment When in a forward gear Articulation display when a camera the view well Functionality/ view is active. Each automatically pan to Picture-in-Picture Side press of the button will show more of the left or icon. Touch X to exit. toggle through the Rear right side based on the . Provides a rearward Trailer View, Trailer Tow position of the trailer. split view of the left and mirror View and Combo The feature is available right sides of the vehicle View. To access this when a trailer is and trailer with an view when in a forward connected. To select, overlay view of the area gear above 12 km/h touch Rear trailer View/ behind the trailer. The (8 mph), touch Rear Side View with feature is available CAMERA on the Available Articulation when a trailer is infotainment display and Functionality/ connected. the feature touch the Rear Trailer Picture-in-Picture Side requires user installation View/Rear Side View View on the of an accessory trailer with Available infotainment display camera on the rear Articulation when a camera view is exterior surface of the Functionality/ active. Each touch will trailer per the accessory Picture-in-Picture Side toggle through the Rear trailer camera View icon. Touch X Trailer View, trailer tow installation instructions to exit. Mirror view and Combo (see your dealer for GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

264 Driving and Operating HD Surround Vision with Trailer Available camera views: grille under the front emblem, the Camera Provisions . Front/Rear Standard View side cameras are on the bottom of If equipped, this feature provides the outside mirrors, and the rear . Front/Rear Top-Down View additional views to aid in trailering/ camera is in the tailgate handle. towing. The system shows multiple . Rear Bowl View The Surround Vision system can be views in the infotainment display . Front/Rear Side View accessed by selecting CAMERA in using five cameras mounted around the infotainment display or when the the vehicle and up to two additional . Hitch View vehicle is shifted into R (Reverse). accessory cameras that can be . Bed View To return to the previous screen mounted on or in a trailer. The front sooner, when not in R (Reverse), camera is in the grille under the . Rear trailer View press the Home or Back button on front emblem, the side cameras are . Rear Side view with a available the infotainment system, shift into on the bottom of the outside mirrors, articulation functionality P (Park), or, while in D (Drive), the rear camera is in the tailgate . Picture-in-Picture Side View reach a vehicle speed of handle and the bed camera is approximately 12 km/h (8 mph). . Interior Trailer View mounted on the rear of the cab. Available camera views: Additionally, up to two accessory . Transparent trailer View cameras can be mounted to the rear . Front/Rear Standard View . Surround View and/or interior of the trailer. See . Front/Rear Top-Down View your dealer for accessory trailer . Guidance Lines cameras. To access, touch . Rear Bowl View . Hitch Guidance CAMERA on the infotainment . Front/Rear Side View display or shift to R (Reverse). To Surround Vision (360 Degrees) return to the previous screen when . Hitch View If equipped, the Surround Vision not in reverse, touch the Home or . Surround View system can display various views Back buttons on the infotainment . Guidance Lines display. surrounding the vehicle in the infotainment display using four . Hitch Guidance cameras mounted around the vehicle. The front camera is in the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 265 Surround Vision Available camera views: . The calibration is attempted in If equipped, this feature provides, . Rear Standard View low light. Calibration should be attempted when there is enough additional views to aid in trailering/ . Hitch View towing. The Front Vision Camera light. and Surround Vision cameras are . Bed View . The calibration is attempted not supported. The system can . Rear Trailer View during adverse weather show various views in the conditions. Calibration during infotainment display using cameras . Interior Trailer View conditions such as snow or mounted in and around the vehicle . Guidance Lines heavy rain should be avoided. and trailer. The rear camera is in the . Hitch Guidance . The road surface is not ideal for tailgate handle and the cargo bed calibration. Calibration should be camera is mounted on the rear of Troubleshooting attempted on an alternate road the cab. Up to two accessory The Transparent Trailer calibration surface. cameras can be mounted to the rear may take longer than expected or and/or interior of the trailer. See . The accessory trailer cameras not calibrate if: your dealer for these accessory are swapped at the hitch cameras. . The vehicle is driven too fast connector. Ensure that the during calibration. Speed should camera mounted to the rear of The system can be accessed by be maintained below 50 km/h the trailer is connected to the selecting CAMERA in the (31 mph). rear trailer camera input. infotainment display or when the vehicle is shifted into R (Reverse). . The vehicle is not driven straight . The accessory trailer camera is To return to the previous screen during calibration. Steering mounted, angled or rotated sooner, when not in R (Reverse), should be maintained as straight outside of the defined mounting press the Home or Back button on as possible, excessive steering location (see camera installation the infotainment system or shift into during calibration may extend instructions). P (Park). calibration time. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

266 Driving and Operating Distortion may be observed in the . The accessory trailer cameras Park Assist calibrated Transparent Trailer are swapped at the hitch With Front and Rear Park Assist, as View if: connector. Ensure that the the vehicle moves at speeds of less accessory camera(s) are . The accessory trailer camera is than 8 km/h (5 mph) the sensors on connected to the correct input. mounted, angled or rotated the bumpers may detect objects up outside of the defined mounting . The accessory trailer camera(s) to 1.2 m (4 ft) in front and 2.5 m (8 ft) location (see camera installation are connected to the correct behind the vehicle within a zone instructions). camera input. 25 cm (10 in) high off the ground The Transparent Trailer icon may . The accessory trailer camera(s) and below bumper level. These appear grayed out if: are not installed according to the detection distances may be shorter installation instructions. during warmer or humid weather. . A compatible trailer profile is not Blocked sensors will not detect configured or a non-compatible A feature may be unavailable or not objects and can also cause false trailer profile is selected. activating as expected if: detections. Keep the sensors clean . The vehicle is in R (Reverse). . The customization is disabled. of mud, dirt, snow, ice, and slush; and clean sensors after a car wash . The trailer is not connected. Check the customization settings where applicable. in freezing temperatures. . The accessory rear trailer . The accessory trailer cameras camera is not connected or { Warning connected to the incorrect input. are swapped at the hitch connector. Ensure that the The Park Assist system does not The preview may not be provided or accessory camera(s) are detect children, pedestrians, the wrong preview may be connected to the correct camera provided if: input. bicyclists, animals, or objects located below the bumper or that . The accessory cameras are not A view may switch automatically if: are too close or too far from the recognized. Ensure that the vehicle. It is not available at accessory camera(s) are . The vehicle is shifted to speeds greater than 8 km/h connected and power cycle the another gear. vehicle. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 267 When an object is first detected in Use caution while backing up when Warning (Continued) the rear, one beep will be heard towing a trailer, as the RCTA from the rear, or both sides of the detection zones that extend out (5 mph). To prevent injury, death, Safety Alert Seat will pulse two from the back of the vehicle do not or vehicle damage, even with times. When an object is very close move further back when a trailer is Park Assist, always check the — <0.4 m (1.5 ft) in the vehicle rear towed. area around the vehicle and or <0.3 m (1 ft) in the vehicle front — check all mirrors before moving RCTA is disabled when the trailer a continuous beep will sound from connection status is displayed. forward or backing. the rear or front depending on object location, or both sides of the RCTA can be turned off. See Safety Alert Seat will pulse five “Collision/Detection Systems” under times. Beeps for FPA are higher Vehicle Personalization 0 156. pitched than for RPA. Turning the Features On or Off Rear Cross Traffic Alert (RCTA) If equipped, when the vehicle is shifted into R (Reverse), RCTA shows a red warning triangle with a left or right pointing arrow on the infotainment display to warn of The instrument cluster may have a traffic coming from the left or right. Park Assist display with bars that This system detects objects coming Press X on the center stack to show “distance to object” and object from up to 20 m (65 ft) from the left turn on or off the Front and Rear location information for the Front or right side of the vehicle. When an Park Assist. The indicator light next and Rear Park Assist system. As object is detected, either three to the button comes on when the the object gets closer, more bars beeps sound from the left or right or features are on and turns off when light up and the bars change color three Safety Alert Seat pulses occur the features have been disabled. from yellow to amber to red. on the left or right side, depending on the direction of the detected vehicle. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

268 Driving and Operating Front and Rear Park Assist can be (LCA), Automatic Emergency turned Off, On, or On with Towbar. Braking (AEB), and/or the Front { Warning See “Park Assist” under Vehicle Pedestrian Braking (FPB) System Personalization 0 156. If Park Assist can help to avoid a crash or reduce FCA is a warning system and is turned off through vehicle crash damage. does not apply the brakes. When personalization, the Park Assist approaching a slower-moving or button will be disabled. To turn Park Forward Collision Alert stopped vehicle ahead too rapidly, Assist on again, select On in vehicle (FCA) System or when following a vehicle too personalization. The On with Towbar closely, FCA may not provide a setting allows Park Assist to work If equipped, the FCA system may warning with enough time to help properly with a trailer hitch. Some help to avoid or reduce the harm avoid a crash. It also may not larger trailer hitches may not be caused by front-end crashes. When provide any warning at all. FCA compatible. approaching a vehicle ahead too does not warn of pedestrians, quickly, FCA provides a red flashing Turn off Park Assist when towing a animals, signs, guardrails, alert on the windshield and rapidly trailer. bridges, construction barrels, beeps or pulses the driver seat. or other objects. Be ready to take To turn the RPA symbols on or off, FCA also lights an amber visual action and apply the brakes. See see “Rear Camera Park Assist alert if following another vehicle Defensive Driving 0 187. Symbols” under Vehicle much too closely. Personalization 0 156. FCA detects vehicles within a FCA can be disabled through distance of approximately 60 m vehicle personalization. See Assistance Systems for (197 ft) and operates at speeds “Collision/Detection Systems” under Driving above 8 km/h (5 mph). Vehicle Personalization 0 156. If equipped, when driving the vehicle in a forward gear, Forward Collision Alert (FCA), Lane Departure Warning (LDW), Lane Keep Assist (LKA), Side Blind Zone Alert (SBZA), Lane Change Alert GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 269 Detecting the Vehicle Ahead Warning (Continued)

or ice, or if the windshield is damaged. It may also not detect a vehicle on winding or hilly roads, or in conditions that can limit visibility such as fog, rain, Without Head-Up Display or snow, or if the headlamps or When your vehicle approaches FCA warnings will not occur unless windshield are not cleaned or in another detected vehicle too rapidly, the FCA system detects a vehicle proper condition. Keep the the red FCA display will flash on the ahead. When a vehicle is detected, windshield, headlamps, and FCA windshield. Also, eight rapid the vehicle ahead indicator will sensors clean and in good repair. high-pitched beeps will sound from display green. Vehicles may not be the front, or both sides of the Safety detected on curves, highway exit Alert Seat will pulse five times. ramps, or hills, due to poor visibility; Collision Alert When this Collision Alert occurs, the or if a vehicle ahead is partially brake system may prepare for driver blocked by pedestrians or other braking to occur more rapidly which objects. FCA will not detect another can cause a brief, mild deceleration. vehicle ahead until it is completely Continue to apply the brake pedal in the driving lane. as needed. Cruise control may be disengaged when the Collision Alert { Warning occurs. With Head-Up Display FCA does not provide a warning to help avoid a crash, unless it detects a vehicle. FCA may not detect a vehicle ahead if the FCA sensor is blocked by dirt, snow, (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

270 Driving and Operating Tailgating Alert timing. The range of selectable alert Cleaning the System timings may not be appropriate for If the FCA system does not seem to all drivers and driving conditions. operate properly, this may correct If your vehicle is equipped with the issue: Adaptive Cruise Control (ACC), . Clean the outside of the changing the FCA timing setting windshield in front of the automatically changes the following rearview mirror. gap setting (Far, Medium, or Near). The vehicle ahead indicator will . Clean the entire front of the display amber when you are Following Distance Indicator vehicle. following a vehicle ahead much too The following distance to a moving . Clean the headlamps. closely. vehicle ahead in your path is Selecting the Alert Timing indicated in following time in Automatic Emergency seconds on the Driver Information The Collision Alert control is on the Center (DIC). The minimum Braking (AEB) steering wheel. Press [ to set the following time is 0.5 seconds away. If the vehicle has Forward Collision FCA timing to Far, Medium, or Near. If there is no vehicle detected Alert (FCA), it also has AEB (1500 The first button press shows the ahead, or the vehicle ahead is out of series only), which includes current setting on the DIC. sensor range, dashes will be Intelligent Brake Assist (IBA). When Additional button presses will displayed. the system detects a vehicle ahead change this setting. The chosen Unnecessary Alerts in your path that is traveling in the setting will remain until it is changed same direction that you may be and will affect the timing of both the FCA may provide unnecessary about to crash into, it can provide a Collision Alert and the Tailgating alerts for turning vehicles, vehicles boost to braking or automatically Alert features. The timing of both in other lanes, objects that are not brake the vehicle. This can help alerts will vary based on vehicle vehicles, or shadows. These alerts avoid or lessen the severity of speed. The faster the vehicle speed, are normal operation and the crashes when driving in a forward the farther away the alert will occur. vehicle does not need service. gear. Depending on the situation, Consider traffic and weather the vehicle may automatically brake conditions when selecting the alert GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 271 moderately or hard. This automatic emergency braking can only occur if Warning (Continued) { Warning a vehicle is detected. This is shown by the FCA vehicle ahead indicator . Detect all vehicles, AEB may automatically brake the being lit. See Forward Collision Alert especially vehicles with a vehicle suddenly in situations (FCA) System 0 268. trailer, tractors, muddy where it is unexpected and vehicles, etc. undesired. It could respond to a The system works when driving in a . Detect a vehicle when turning vehicle ahead, guardrails, forward gear between 8 km/h signs, and other non-moving (5 mph) and 80 km/h (50 mph). weather limits visibility, such objects. To override AEB, firmly It can detect vehicles up to as in fog, rain, or snow. press the accelerator pedal, if it is approximately 60 m (197 ft). . Detect a vehicle ahead if it is partially blocked by safe to do so. { Warning pedestrians or other objects. Complete attention is always Intelligent Brake Assist (IBA) AEB is an emergency crash required while driving, and you IBA may activate when the brake preparation feature and is not should be ready to take action pedal is applied quickly by providing designed to avoid crashes. Do and apply the brakes and/or steer a boost to braking based on the not rely on AEB to brake the the vehicle to avoid crashes. speed of approach and distance to vehicle. AEB will not brake a vehicle ahead. outside of its operating speed range and only responds to AEB may slow the vehicle to a Minor brake pedal pulsations or detected vehicles. complete stop to try to avoid a pedal movement during this time is potential crash. If this happens, AEB normal and the brake pedal should AEB may not: may engage the Electric Parking continue to be applied as needed. . Detect a vehicle ahead on Brake (EPB) to hold the vehicle at a IBA will automatically disengage winding or hilly roads. stop. Release the EPB or firmly only when the brake pedal is press the accelerator pedal. released. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

272 Driving and Operating . There is a problem with the The FPB system can detect and { Warning StabiliTrak/Electronic Stability alert to pedestrians in a forward Control (ESC) system. gear at speeds between 8 km/h IBA may increase vehicle braking (5 mph) and 80 km/h (50 mph). in situations when it may not be The AEB system does not need service. During daytime driving, the system necessary. You could block the detects pedestrians up to a distance flow of traffic. If this occurs, take of approximately 40 m (131 ft). your foot off the brake pedal and Front Pedestrian Braking During nighttime driving, system then apply the brakes as needed. (FPB) System (1500 performance is very limited. Series) AEB and IBA can be disabled. See If equipped, the FPB system may { Warning “Collision/Detection Systems” under help avoid or reduce the harm Vehicle Personalization 0 156. FPB does not provide an alert or caused by front-end crashes with automatically brake the vehicle, nearby pedestrians when driving in unless it detects a pedestrian. { Warning a forward gear. FPB displays an FPB may not detect pedestrians, amber indicator, ~, when a nearby Using AEB or IBA while towing a including children: pedestrian is detected ahead. When trailer could cause you to lose approaching a detected pedestrian . When the pedestrian is not control of the vehicle and crash. too quickly, FPB provides a red directly ahead, fully visible, Turn the system to Alert or Off flashing alert on the windshield and or standing upright, or when when towing a trailer. rapidly beeps or pulses the driver part of a group. seat. FPB can provide a boost to . Due to poor visibility, A system unavailable message may braking or automatically brake the including nighttime display if: vehicle. This system includes conditions, fog, rain, Intelligent Brake Assist (IBA), and or snow. . The front of the vehicle or the Automatic Emergency Braking windshield is not clean. (AEB) system may also respond to . If the FPB sensor is blocked . Heavy rain or snow is interfering pedestrians. See Automatic by dirt, snow, or ice. with object detection. Emergency Braking (AEB) 0 270. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 273 FPB alerts and automatic braking When this Pedestrian Alert occurs, Warning (Continued) will not occur unless the FPB the brake system may prepare for system detects a pedestrian. When driver braking to occur more rapidly . If the headlamps or a nearby pedestrian is detected in which can cause a brief, mild windshield are not cleaned front of the vehicle, the pedestrian deceleration. Continue to apply the or in proper condition. ahead indicator will display amber. brake pedal as needed. Cruise Be ready to take action and apply control may be disengaged when the brakes. For more information, Front Pedestrian Alert the Front Pedestrian Alert occurs. 0 see Defensive Driving 187. Automatic Braking Keep the windshield, headlamps, and FPB sensor clean and in If FPB detects it is about to crash good repair. into a pedestrian ahead, and the brakes have not been applied, FPB may automatically brake moderately FPB can be set to Off, Alert, or Alert With Head-Up Display or brake hard. This can help to and Brake through vehicle avoid some very low speed personalization. See “Collision/ pedestrian crashes or reduce Detection Systems” under Vehicle pedestrian injury. FPB can 0 Personalization 156. automatically brake to detected Detecting the Pedestrian pedestrians between 8 km/h (5 mph) Ahead and 80 km/h (50 mph). Automatic braking levels may be reduced Without Head-Up Display under certain conditions, such as When the vehicle approaches a higher speeds. pedestrian ahead too rapidly, the If this happens, Automatic Braking red FPB alert display will flash on may engage the Electric Parking the windshield. Eight rapid Brake (EPB) to hold the vehicle at a high-pitched beeps will sound from stop. Release the EPB. A firm press the front, or both sides of the Safety Alert Seat will pulse five times. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

274 Driving and Operating of the accelerator pedal will also and a vehicle is also detected on release Automatic Braking and { Warning the same side, the display will flash the EPB. as an extra warning not to change Using the Front Pedestrian lanes. Since this system is part of Braking system while towing a { Warning the Lane Change Alert (LCA) trailer could cause you to lose system, read the entire LCA section FPB may alert or automatically control of the vehicle and crash. before using this feature. brake the vehicle suddenly in Turn the system to Alert or Off situations where it is unexpected when towing a trailer. Lane Change Alert (LCA) and undesired. It could falsely If equipped, the LCA system is a alert or brake for objects similar in Cleaning the System lane-changing aid that assists shape or size to pedestrians, If FPB does not seem to operate drivers with avoiding lane change including shadows. This is normal properly, cleaning the outside of the crashes that occur with moving operation and the vehicle does windshield in front of the rearview vehicles in the side blind zone (or not need service. To override mirror may correct the issue. spot) areas or with vehicles rapidly Automatic Braking, firmly press approaching these areas from the accelerator pedal, if it is safe Side Blind Zone behind. The LCA warning display to do so. will light up in the corresponding Alert (SBZA) outside side mirror and will flash if the turn signal is on. Automatic Braking can be disabled If equipped, the SBZA system is a through vehicle personalization. See lane-changing aid that assists “Front Pedestrian Detection” in drivers with avoiding crashes that { Warning “Collision/Detection Systems” under occur with moving vehicles in the Vehicle Personalization 0 156. side blind zone (or spot) areas. LCA does not alert the driver to When the vehicle is in a forward vehicles outside of the system gear, the left or right side mirror detection zones, pedestrians, display will light up if a moving bicyclists, or animals. It may not vehicle is detected in that blind (Continued) zone. If the turn signal is activated GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 275 The LCA sensor covers a zone of Warning (Continued) approximately one lane over from both sides of the vehicle, or 3.5 m provide alerts when changing (11 ft). The height of the zone is lanes under all driving conditions. approximately between 0.5 m (1.5 ft) Failure to use proper care when and 2 m (6 ft) off the ground. The changing lanes may result in Side Blind Zone Alert (SBZA) Left Side Mirror Right Side Mirror injury, death, or vehicle damage. warning area starts at approximately Display Display Before making a lane change, the middle of the vehicle and goes always check mirrors, glance over back 5 m (16 ft). Drivers are also When the vehicle is started, both your shoulder, and use the turn warned of vehicles rapidly outside mirror LCA displays will signals. approaching from up to 25 m (82 ft) briefly come on to indicate the behind the vehicle. system is operating. When the LCA Detection Zones vehicle is in a forward gear, the left How the System Works or right side mirror display will light The LCA symbol lights up in the up if a moving vehicle is detected in side mirrors when the system the next lane over in that blind zone detects a moving vehicle in the next or rapidly approaching that zone. lane over that is in the side blind If the turn signal is activated in the zone or rapidly approaching that same direction as a detected zone from behind. A lit LCA symbol vehicle, this display will flash as an indicates it may be unsafe to extra warning not to change lanes. change lanes. Before making a lane LCA is disabled when the trailer change, check the LCA display, connection status is displayed. check mirrors, glance over your 1. SBZA Detection Zone A DIC message may display. The shoulder, and use the turn signals. SBZA system still operates. 2. LCA Detection Zone LCA can be disabled through vehicle personalization. When you disable LCA, SBZA is also disabled. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

276 Driving and Operating See Vehicle Personalization 0 156. with the detection of vehicles. This If the LCA displays do not light up If LCA is disabled by the driver, the is normal system operation; the when moving vehicles are in the LCA mirror displays will not light up. vehicle does not need service. side blind zone or are rapidly LCA may not always alert the driver approaching this zone and the When the System Does Not system is clean, the system may Seem to Work Properly to vehicles in the next lane over, especially in wet conditions or when need service. Take the vehicle to The LCA system requires some driving on sharp curves. The system your dealer. driving for the system to calibrate to does not need to be serviced. The Radio Frequency Information maximum performance. This system may light up due to calibration may occur more quickly if guardrails, signs, trees, shrubs, and See Radio Frequency Statement 0 the vehicle is driving on a straight other non-moving objects. This is 472. highway road with traffic and normal system operation; the roadside objects (e.g., guardrails, vehicle does not need service. Lane Departure Warning barriers). LCA may not operate when the LCA (LDW) (2500/3500 Series) LCA displays may not come on sensors in the left or right corners of If equipped, LDW may help avoid when passing a vehicle quickly, for the rear bumper are covered with crashes due to unintentional lane a stopped vehicle, or when towing a mud, dirt, snow, ice, or slush, or in departures. LDW uses a camera trailer. The LCA detection zones heavy rainstorms. For cleaning sensor to detect the lane markings that extend back from the side of instructions, see "Washing the at speeds of 56 km/h (35 mph) or the vehicle do not move further back Vehicle" under Exterior Care 0 429. greater. It may provide an alert if the when a trailer is towed. Use caution If the DIC still displays the system vehicle is crossing a lane without while changing lanes when towing a unavailable message after cleaning using a turn signal in that direction. trailer. LCA may alert to objects both sides of the vehicle toward the LDW light will not alert if the turn attached to the vehicle, such as a rear corners of the vehicle, see your signal is active in the direction of trailer, bicycle, or object extending dealer. lane departure, or if LDW detects out to either side of the vehicle. that you are accelerating, braking or Attached objects may also interfere actively steering. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 277

{ Warning Warning (Continued)

The LDW system does not steer attention on the road and the vehicle. The LDW system maintain proper vehicle position may not: within the lane, or vehicle damage, injury, or death could . Provide enough time to When LDW is on, @ is green if avoid a crash. occur. Always keep the windshield, headlamps, and LDW is available to warn of a lane . Detect lane markings under camera sensors clean and in departure. If the vehicle crosses a poor weather or visibility good repair. Do not use LDW in detected lane marking without using conditions. This can occur if bad weather conditions. the turn signal in that direction, @ the windshield or changes to amber and flashes. headlamps are blocked by Additionally, there will be three dirt, snow, or ice; if they are How the System Works beeps, on the right or left, not in proper condition; or if LDW utilizes a camera sensor depending on the lane departure the sun shines directly into installed on the windshield ahead of direction. LDW will not alert if the the camera. the rearview mirror to detect lane turn signal is active in the direction . Detect road edges. markings. of lane departure or if LDA detects that you are accelerating, braking or . Detect lanes on winding or To turn LDW on and off, press @ on actively steering. hilly roads. the instrument panel to the left of If LDW only detects lane the steering wheel. The control When the System Does Not markings on one side of the road, indicator will light when LDW is on. Seem to Work Properly it will only warn you when The system may not detect lanes as departing the lane on the side well when there are: where it has detected a lane . Close vehicles ahead. marking. Always keep your . Sudden lighting changes, such (Continued) as when driving through tunnels. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

278 Driving and Operating . Banked roads. overridden by turning the steering Warning (Continued) If the LDW system is not functioning wheel. This system is not intended properly when lane markings are to keep the vehicle centered in the lane. LKA will not assist and alert if dirt, snow, or ice; if they are clearly visible, cleaning the not in proper condition; or if windshield may help. the turn signal is active in the direction of lane departure, or if it the sun shines directly into LDW alerts may occur due to tar detects that you are accelerating, the camera. marks, shadows, cracks in the road, braking or actively steering. . Detect road edges. temporary or construction lane . Detect lanes on winding or markings, or other road { Warning imperfections. This is normal system hilly roads. operation; the vehicle does not need The LKA system does not If LKA only detects lane markings service. Turn LDW off if these continuously steer the vehicle. on one side of the road, it will conditions continue. It may not keep the vehicle in the only assist or provide an LDW lane or give a Lane Departure alert when approaching the lane Lane Keep Assist (LKA) Warning (LDW) alert, even if a on the side where it has detected (1500 Series) lane marking is detected. a lane marking. Even with LKA and LDW, you must steer the If equipped, LKA may help avoid The LKA and LDW systems vehicle. Always keep your crashes due to unintentional lane may not: attention on the road and departures. This system uses a . Provide an alert or enough maintain proper vehicle position camera to detect lane markings steering assist to avoid a between 60 km/h (37 mph) and within the lane, or vehicle lane departure or crash. 180 km/h (112 mph). It may assist damage, injury, or death could by gently turning the steering wheel . Detect lane markings under occur. Always keep the if the vehicle approaches a detected poor weather or visibility windshield, headlamps, and lane marking. It may also provide a conditions. This can occur if camera sensors clean and in Lane Departure Warning (LDW) the windshield or good repair. Do not use LKA in alert if the vehicle crosses a headlamps are blocked by (Continued) detected lane marking. LKA can be (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 279 To turn LKA on and off, press A Take Steering Warning (Continued) on the center stack. If equipped, the The LKA system does not bad weather conditions or on indicator light on the button comes continuously steer the vehicle. roads with unclear lane markings, on when LKA is on and turns off If LKA does not detect active driver such as construction zones. when LKA is disabled. steering, an alert and chime may be provided. Steer the vehicle to When on, A is white, if equipped, dismiss. LKA may become indicating that the system is not temporarily unavailable after { Warning ready to assist. A is green if LKA repeated take steering alerts. is ready to assist. LKA may assist Using LKA while towing a trailer by gently turning the steering wheel When the System Does Not or on slippery roads could cause if the vehicle approaches a detected Seem to Work Properly loss of control of the vehicle and lane marking. A is amber when The system performance may be a crash. Turn the system off. assisting. It may also provide a affected by: Lane Departure Warning (LDW) . Close vehicles ahead. How the System Works alert by flashing A amber if the vehicle crosses a detected lane . Sudden lighting changes, such as when driving through tunnels. LKA uses a camera sensor installed marking. Additionally, there may be on the windshield ahead of the three beeps, or the driver seat may . Banked roads. rearview mirror to detect lane pulse three times, on the right or markings. It may provide brief . Roads with poor lane markings, left, depending on the lane such as two-lane roads. steering assist if it detects an departure direction. unintended lane departure. It may If the LKA system is not functioning further provide an audible alert or properly when lane markings are the driver seat may pulse indicating clearly visible, cleaning the that a lane marking has been windshield may help. crossed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

280 Driving and Operating A camera blocked message may Fuel Recommended Fuel display if the camera is blocked. Some driver assistance systems (Except 6.2L V8 Engine) may have reduced performance or Top Tier Fuel For diesel engine vehicles, see not work at all. An LKA or LDW GM recommends the use of TOP “Fuel for Diesel ” in the unavailable message may display if TIER Detergent Gasoline to keep Duramax diesel supplement. the systems are temporarily the engine clean, reduce engine unavailable. This message could be deposits, and maintain optimal due to a blocked camera. The LKA vehicle performance. Look for the system does not need service. TOP TIER Logo or see Clean the outside of the windshield www.toptiergas.com for a list of TOP behind the rearview mirror. TIER Detergent Gasoline marketers LKA assistance and/or LDW alerts and applicable countries. may occur due to tar marks, If the vehicle has a yellow fuel cap shadows, cracks in the road, or a yellow sticker on the fuel door, temporary or construction lane E85 or FlexFuel can be used. If the markings, or other road vehicle does not have a yellow fuel imperfections. This is normal system cap or yellow sticker, do not use operation; the vehicle does not need gasoline with levels greater service. Turn LKA off if these than 15% by volume. See E85 or conditions continue. FlexFuel 0 282. Use regular unleaded gasoline meeting ASTM specification D4814 with a posted octane rating of 87 — (R+M)/2 — or higher. Do not use gasoline with a posted octane rating of less than 87, as this may cause engine knock and will lower fuel economy. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 281 Recommended Fuel (6.2L Do not use any fuel labeled E85 or FlexFuel. Do not use gasoline with Caution (Continued) V8 Engine) ethanol levels greater than 15% by volume. . Fuel containing metals such as methylcyclopentadienyl manganese tricarbonyl Prohibited Fuels (MMT), which can damage the emissions control Caution system and spark plugs. Do not use fuels with any of the . Fuel with a posted octane Premium unleaded gasoline following conditions; doing so rating of less than the meeting ASTM specification D4814 may damage the vehicle and void recommended fuel. Using with a posted octane rating of 93 this fuel will lower fuel — its warranty: (R+M)/2 — is highly recommended economy and performance, for best performance and fuel . For vehicles that are not and may decrease the life of economy. Unleaded gasoline with FlexFuel, fuel labeled the emissions catalyst. an octane rated as low as 87 can be greater than 15% ethanol by used. Using unleaded gasoline volume, such as mid-level rated below 93 octane, however, will ethanol blends (16–50% Fuels in Foreign lead to reduced acceleration and ethanol), E85, or FlexFuel. Countries fuel economy. If knocking occurs, . Fuel with any amount of The U.S., Canada, and Mexico post use a gasoline rated at 93 octane , methylal, as soon as possible, otherwise, the fuel octane ratings in anti-knock ferrocene, and aniline. index (AKI). For fuel not to use in a engine could be damaged. If heavy These fuels can corrode knocking is heard when using foreign country, see Prohibited metal fuel system parts or Fuels 0 281. gasoline with a 93 octane rating, the damage plastic and rubber engine needs service. parts. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

282 Driving and Operating Fuel Additives The use of E85 or FlexFuel is refilled more often. See Filling the encouraged when the vehicle is Tank (Pickup Model) 0 283 or TOP TIER Detergent Gasoline is designed to use it. E85 or FlexFuel Filling the Tank (Chassis Cab highly recommended for use with is made from renewable sources. Model) 0 285. your vehicle. If your country does not have TOP TIER Detergent To help locate fuel stations that The only GM approved aftermarket Gasoline, add ACDelco Fuel carry E85 or FlexFuel, the U.S. additive is ACDelco Fuel System System Treatment Plus−Gasoline to Department of Energy has an Treatment Plus-FlexFuel. Follow the the vehicle’s gasoline fuel tank at alternative fuel website. See instructions on the bottle for proper every oil change or 15 000 km www.afdc.energy.gov/afdc/locator/ use. This product is available at (9,000 mi), whichever occurs first. stations. your GM dealer. TOP TIER Detergent Gasoline and E85 or FlexFuel should meet ASTM ACDelco Fuel System Treatment Specification D 5798 or CAN/ Caution Plus−Gasoline will help keep your CGSB–3.512 in Canada. Do not use vehicle’s engine fuel deposit free the fuel if the ethanol content is Some additives are not and performing optimally. greater than 85%. Fuel mixtures that compatible with E85 or FlexFuel do not meet ASTM or CGSB and can harm the vehicle's fuel E85 or FlexFuel specifications can affect driveability system. Use only additives and could cause the malfunction approved by GM for E85 or Vehicles with a yellow fuel sticker indicator lamp to come on. FlexFuel vehicles. Damage on the fuel door can use either caused by unapproved additives unleaded gasoline or fuel containing The starting characteristics of E85 would not be covered by the up to 85% ethanol (E85). All other or FlexFuel make it unsuitable for vehicle warranty. vehicles should use only the use when temperatures fall below unleaded gasoline as described in −18 °C (0 °F). Use gasoline or add Recommended Fuel (Except 6.2L gasoline to the E85 or FlexFuel. 0 V8 Engine) 280 or Because E85 or FlexFuel has less Recommended Fuel (6.2L energy per liter (gallon) than 0 V8 Engine) 281. gasoline, the vehicle will need to be GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 283

Caution { Warning Warning (Continued)

Do not use fuel containing Fuel vapors and fuel fires burn . Before touching the fill methanol. It can corrode metal violently and can cause injury or nozzle, touch a metallic parts in the fuel system and also death. object to discharge static electricity from your body. damage plastic and rubber parts. Follow these guidelines to help That damage would not be avoid injuries to you and others: . Fuel can spray out if the fill covered under the vehicle nozzle is inserted too warranty. . Read and follow all the quickly. This spray can instructions on the fuel happen if the tank is nearly pump island. To help keep the engine running full, and is more likely in hot efficiently, fill the tank with gasoline, . Turn off the engine when weather. Insert the fill nozzle up to E15, after filling the tank with refueling. slowly and wait for any hiss noise to stop before E85 one or two times. . Keep sparks, flames, and beginning to flow fuel. smoking materials away Filling the Tank (Pickup from fuel. Model) . Do not leave the fuel pump If the vehicle has a diesel engine, unattended. see the Duramax diesel . Avoid using electronic supplement. devices while refueling. An arrow on the fuel gauge . Do not re-enter the vehicle indicates which side of the vehicle while pumping fuel. the fuel door is on. See Fuel Gauge 0 . Keep children away from 131. the fuel pump and never let children pump fuel. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

284 Driving and Operating Be careful not to spill fuel. Wait five seconds after you have finished pumping before removing the fill nozzle. Clean fuel from painted surfaces as soon as possible. See Exterior Care 0 429. Push the fuel door closed. 1. Locate the capless funnel adapter. { Warning 2. Insert and latch the funnel into If a fire starts while you are the capless fuel system. refueling, do not remove the fill { Warning The capless refueling system does nozzle. Shut off the flow of fuel by shutting off the pump or by not have a fuel cap. Fully insert and Attempting to refuel from a latch the fill nozzle, begin fueling. notifying the station attendant. Leave the area immediately. portable fuel container without using the funnel adapter may { Warning cause fuel spillage and damage Filling the Tank with a Portable the capless fuel system. This Overfilling the fuel tank by more Fuel Container could cause a fire. You or others than three clicks of a standard fill If the vehicle runs out of fuel and could be badly burned and the nozzle may cause: must be filled from a portable fuel vehicle could be damaged. . Vehicle performance issues, container: including engine stalling and 3. Remove and clean the funnel damage to the fuel system. adapter and return it to the . Fuel spills. storage location. . Under certain conditions, fuel fires. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 285 Filling the Tank (Chassis Turn the fuel cap counterclockwise Warning (Continued) to remove. Fully insert and latch the Cab Model) fill nozzle, begin fueling. If the . Do not leave the fuel pump If the vehicle has a diesel engine, vehicle is a dual fuel tank chassis unattended. see the Duramax diesel cab model, and it runs out of fuel, supplement. . Avoid using electronic refuel the front fuel tank first to devices while refueling. ensure a quick restart. An arrow on the fuel gauge indicates which side of the vehicle . Do not re-enter the vehicle the fuel door is on. See Fuel Gauge while pumping fuel. { Warning 0 131. . Keep children away from Overfilling the fuel tank by more the fuel pump and never let than three clicks of a standard fill { Warning children pump fuel. nozzle may cause: Fuel vapors and fuel fires burn . Before touching the fill . Vehicle performance issues, violently and can cause injury or nozzle, touch a metallic including engine stalling and death. object to discharge static damage to the fuel system. electricity from your body. Follow these guidelines to help . Fuel spills. . Fuel can spray out if the fuel avoid injuries to you and others: cap is opened too quickly. . Under certain conditions, . Read and follow all the This spray can happen if the fuel fires. instructions on the fuel tank is nearly full, and is pump island. more likely in hot weather. Be careful not to spill fuel. Wait . Turn off the engine when Open the fuel cap slowly five seconds after you have finished refueling. and wait for any hiss noise pumping before removing the fill to stop, then unscrew the nozzle. Clean fuel from painted . Keep sparks, flames, and cap all the way. surfaces as soon as possible. See smoking materials away Exterior Care 0 429. Reinstall the from fuel. cap by turning it clockwise until it (Continued) clicks. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

286 Driving and Operating Filling a Portable Fuel { Warning Warning (Continued) Container If a fire starts while you are . Keep sparks, flames, and refueling, do not remove the fill { Warning smoking materials away nozzle. Shut off the flow of fuel by from fuel. shutting off the pump or by Never fill a portable fuel container . Do not use electronic notifying the station attendant. while it is in the vehicle. Static devices while pumping fuel. Leave the area immediately. electricity discharge from the container can ignite the fuel vapor. You or others could be badly burned and the vehicle Caution could be damaged. To help avoid If a new fuel cap is needed, get injury to you and others: the right type of cap from your . Dispense fuel only into dealer. The wrong type of fuel cap approved containers. may not fit properly, may turn on . Do not fill a container while the malfunction indicator lamp, it is inside a vehicle, in a and could damage the fuel vehicle's , in a pickup system and emissions system. bed, or on any surface other See Malfunction Indicator Lamp than the ground. (Check Engine Light) 0 137. . Bring the fill nozzle in contact with the inside of the fill opening before operating the nozzle. Maintain contact until filling is complete. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 287 Trailer Towing important for your safety and that of Warning (Continued) your passengers. Read this section carefully before pulling a trailer. General Towing trailer brakes are inadequate for Information the load, the vehicle may not stop When towing a trailer: as expected. You and others . Become familiar with and follow Only use towing equipment that has could be seriously injured. The all state and local laws that been designed for the vehicle. vehicle may also be damaged, apply to trailer towing. These Contact your dealer or trailering and the repairs would not be requirements vary from state to dealer for assistance with preparing covered by the vehicle warranty. state. the vehicle to tow a trailer. Read the Pull a trailer only if all the steps in entire section before towing a trailer. . State laws may require the use this section have been followed. of extended side view mirrors. To tow a disabled vehicle, see Ask your dealer for advice and 0 Even if not required, you should Towing the Vehicle 424. To tow information about towing a trailer install extended side view the vehicle behind another vehicle with the vehicle. mirrors if your visibility is limited such as a motor home, see or restricted while towing. Recreational Vehicle Towing 0 424. Driving with a Trailer . Do not tow a trailer during the first 800 km (500 mi) of vehicle Driving Characteristics Trailering is different than just use to prevent damage to the driving the vehicle by itself. and Towing Tips engine, axle, or other parts. Trailering means changes in handling, acceleration, braking, . It is recommended to perform { Warning durability, and fuel economy. the first oil change before heavy You can lose control when towing Successful, safe trailering takes towing. a trailer if the correct equipment is correct equipment, and it has to be . During the first 800 km (500 mi) not used or the vehicle is not used properly. of trailer towing, do not drive driven properly. For example, The following information has many over 80 km/h (50 mph) and do if the trailer is too heavy or the time-tested, important trailering tips not make starts at full throttle. (Continued) and safety rules. Many of these are GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

288 Driving and Operating . Vehicles can tow in D (Drive). . Front Pedestrian Braking (FPB) Warning (Continued) Tow/Haul Mode is recommended If equipped with Lane Change Alert for heavier trailers. See Tow/ 0 (LCA), the LCA detection zones that . Fully open the air outlets on Haul Mode 227. If the extend back from the side of the transmission downshifts too or under the instrument vehicle do not move further back panel. often, a lower gear may be when a trailer is towed. Use caution selected using Manual Mode. . Adjust the climate control 0 while changing lanes when towing a See Manual Mode 224. trailer. system to a setting that brings in only outside air. If equipped, the following driver If equipped with Rear Cross Traffic assistance features should be See “Climate Control Alert (RCTA), use caution while Systems” in the Index. turned off when towing a trailer: backing up when towing a trailer, as . Adaptive Cruise Control (ACC) the RCTA detection zones that For more information about extend out from the back of the carbon monoxide, see Engine . Super Cruise Control 0 vehicle do not move further back Exhaust 220. . Lane Keep Assist (LKA) when a trailer is towed. . Park Assist Towing a trailer requires experience. The combination of the vehicle and . Automatic Parking Assist (APA) { Warning trailer is longer and not as . Reverse Automatic To prevent serious injury or death responsive as the vehicle itself. Get Braking (RAB) from carbon monoxide (CO), used to the handling and braking of If equipped, the following driver when towing a trailer: the combination by driving on a assistance features should be . Do not drive with the level road surface before driving on turned to alert or off when towing a liftgate, trunk/hatch, public roads. trailer: or rear-most window open. The trailer structure, the tires, and . Automatic Emergency (Continued) the brakes must all be rated to carry Braking (AEB) the intended cargo. Inadequate trailer equipment can cause the . Intelligent Brake Assist (IBA) combination to operate in an GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 289 unexpected or unsafe manner. Following Distance Making Turns Before driving, inspect all trailer Stay at least twice as far behind the hitch parts and attachments, safety vehicle ahead as you would when Caution chains, electrical connectors, lamps, driving without a trailer. This can tires, and mirrors. See Towing help to avoid heavy braking and Turn more slowly and make wider Equipment 0 296. If the trailer has sudden turns. arcs when towing a trailer to electric brakes, start the prevent damage to your vehicle. combination moving and then Passing Making very sharp turns could manually apply the trailer brake cause the trailer to contact the controller to check that the trailer More passing distance is needed vehicle. brakes work. During the trip, when towing a trailer. The occasionally check that the cargo combination of the vehicle and and trailer are secure and that the trailer will not accelerate as quickly Make wider turns than normal when lamps and any trailer brakes are and is much longer than the vehicle towing, so the trailer will not go over working. alone. It is necessary to go much soft shoulders, over curbs, or strike farther beyond the passed vehicle road signs, trees, or other objects. Towing with a Stability Control before returning to the lane. Pass Always signal turns well in advance. System on level roadways. Avoid passing Do not steer or brake suddenly. on hills if possible. When towing, the stability control Driving on Grades system might be heard. The system Backing Up reacts to vehicle movement caused Reduce speed and shift to a lower Hold the bottom of the steering by the trailer, which mainly occurs gear before starting down a long or wheel with one hand. To move the during cornering. This is normal steep downhill grade. If the trailer to the left, move that hand to when towing heavier trailers. transmission is not shifted down, the the left. To move the trailer to the brakes may overheat and result in right, move that hand to the right. reduced braking efficiency. Always back up slowly and, if possible, have someone guide you. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

290 Driving and Operating The vehicle can tow in D (Drive). Parking on Hills Leaving After Parking on a Hill Shift the transmission to a lower 1. Apply and hold the brake gear if the transmission shifts too { Warning pedal. often under heavy loads and/or hilly conditions. To prevent serious injury or death, . Start the engine. When towing at higher altitudes, always park your vehicle and . Shift into a gear. trailer on a level surface when engine coolant will boil at a lower . Release the parking brake. temperature than at lower altitudes. possible. If the engine is turned off 2. Let up on the brake pedal. immediately after towing at high When parking your vehicle and your 3. Drive slowly until the trailer is altitude on steep uphill grades, the trailer on a hill: clear of the chocks. vehicle could show signs similar to engine overheating. To avoid this, 1. Press the brake pedal, but do 4. Stop and have someone pick let the engine run, preferably on not shift into P (Park) yet. Turn up and store the chocks. level ground, with the transmission the wheels into the curb if Launching and Retrieving facing downhill or into traffic if in P (Park) for a few minutes before a Boat turning the engine off. If the facing uphill. overheat warning comes on, see 2. Have someone place chocks Backing the Trailer into the Water 0 Engine Overheating 351. under the trailer wheels. Viewing Systems 3. Gradually release the brake { Warning If equipped, the viewing systems on pedal to allow the chocks to . Have all passengers get out the vehicle can improve visibility absorb the load of the trailer. of the vehicle before while hitching, backing, and driving 4. Reapply the brake pedal. Then backing onto the sloped part with a trailer. See Driver Assistance apply the parking brake and of the ramp. Lower the Systems 0 255. shift into P (Park). driver and passenger side windows before backing 5. Release the brake pedal. onto the ramp. This will (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 291 Disconnect the wiring to the trailer 6. Reapply the brake pedal. Then Warning (Continued) before backing the trailer into the apply the parking brake and water to prevent damage to the shift into P (Park). provide a means of escape electrical circuits on the trailer. 7. Release the brake pedal. in the unlikely event the Reconnect the wiring to the trailer vehicle slides into the water. after removing the trailer from the Pulling the Trailer from the Water . If the boat launch surface is water. If the trailer has electric To pull the trailer out of the water: slippery, have the driver brakes that can function when the remain in the vehicle with trailer is submerged, it might help to 1. Press and hold the brake the brake pedal applied leave the electrical trailer connector pedal. while the boat is being attached to maintain trailer brake 2. Start the engine and shift launched. The boat launch functionality while on the boat ramp. into gear. can be especially slippery at To back the trailer into the water: low tide when part of the 3. Release the parking brake. ramp was previously 1. If equipped, place the vehicle 4. Let up on the brake pedal. submerged at high tide. Do in four-wheel-drive high. not back onto the ramp to 5. Drive slowly until the tires are 2. Slowly back down the boat clear of the chocks. launch the boat if you are ramp until the boat is floating, not sure the vehicle can but no further than necessary. 6. Stop and have someone pick maintain traction. up and store the chocks. 3. Press and hold the brake . Do not move the vehicle if pedal, but do not shift into 7. Slowly pull the trailer from the someone is in the path of P (Park) yet. water. the trailer. Some parts of the 4. Have someone place chocks 8. Once the vehicle and trailer trailer might be underwater have been driven from the and not visible to people under the front wheels of the vehicle. sloped part of the boat ramp, who are assisting in the vehicle can be shifted from launching the boat. 5. Gradually release the brake four-wheel-drive high. Shift into pedal to allow the chocks to absorb the load of the trailer. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

292 Driving and Operating the drive mode that is Engine Cooling When Trailer Successful, safe trailering takes appropriate for the road Towing correct equipment, and it has to be conditions. used properly. The cooling system may temporarily overheat during severe operating The following information has many Caution conditions. See Engine Overheating time-tested, important trailering tips 0 351. and safety rules. Many of these are If the vehicle tires begin to spin important for your safety and that of and the vehicle begins to slide Trailer Towing your passengers. Read this section toward the water, remove your carefully before pulling a trailer. foot from the accelerator pedal If equipped with a diesel engine, and apply the brake pedal. Seek see the Duramax diesel Trailer Weight help to have the vehicle towed up supplement. the ramp. { Warning Caution Never exceed the towing capacity Maintenance when Trailer Towing a trailer improperly can for your vehicle. Towing damage the vehicle and result in The vehicle needs service more costly repairs not covered by the Safe trailering requires monitoring often when used to tow trailers. See vehicle warranty. To tow a trailer the weight, speed, altitude, road Maintenance Schedule 0 441. It is correctly, follow the directions in grades, outside temperature, and especially important to check the this section and see your dealer how frequently the vehicle is used to engine oil, axle lubricant, belts, for important information about tow a trailer. cooling system, and brake system towing a trailer with the vehicle. before and during each trip. Trailer Weight Ratings Check periodically to see that all Trailering is different than just When towing a trailer, the combined nuts and bolts on the trailer hitch driving the vehicle by itself. weight of the vehicle, vehicle are tight. Trailering means changes in contents, trailer, and trailer contents handling, acceleration, braking, durability, and fuel economy. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 293 must be below all of the maximum A trailering information label on the To check that the weight of the weight ratings for the vehicle, B-pillar shows tow rating information vehicle and trailer are within the including: for the vehicle. GCWR for the vehicle, follow these . GCWR: Gross Combined Weight steps: Rating { Warning 1. Start with the "curb weight" . GVWR: Gross Vehicle Weight from the Trailering Information You and others could be seriously Label. Rating injured or killed if the trailer is too . Maximum Trailer Weight Rating heavy or the trailer brakes are 2. Add the weight of the trailer inadequate for the load. The loaded with cargo and ready . GAWR-RR: Gross Axle Weight for the trip. Rating-Rear vehicle may be damaged, and the repairs would not be covered by 3. Add the weight of all . Maximum Trailer Tongue Weight the vehicle warranty. passengers. Rating Only tow a trailer if all the steps in 4. Add the weight of all cargo in See “Weight-Distributing Hitch and this section have been followed. the vehicle. Adjustment” under Towing Ask your dealer for advice and Equipment 0 296 to determine if 5. Add the weight of hitch information about towing a trailer. equalizer bars are required to obtain hardware such as a draw bar, the maximum trailer weight rating. ball, load equalizer bars, Gross Combined Weight or sway bars. See “Trailer Brakes” under Towing Equipment 0 296 to determine if Rating (GCWR) 6. Add the weight of any accessories or aftermarket brakes are required based on your GCWR is the total allowable weight trailer's weight. equipment added to the of the completely loaded vehicle vehicle. The only way to be sure the weight and trailer including any fuel, is not exceeding any of these passengers, cargo, equipment, and The resulting weight cannot exceed ratings is to weigh the tow vehicle accessories. Do not exceed the the GCWR value on the Trailering and trailer combination, fully loaded GCWR for your vehicle. The GCWR Information Label. for the trip, getting individual for the vehicle is on the Trailering weights for each of these items. Information Label. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

294 Driving and Operating The gross combined weight can Maximum Trailer Weight Maximum Trailer Tongue also be confirmed by weighing the The maximum trailer weight rating is Weight Rating truck and trailer on a public scale. calculated assuming the tow vehicle The truck and trailer should be The Maximum Trailer Tongue has a driver, a front seat passenger, loaded for the trip with passengers Weight Rating is the allowable and all required trailering and cargo. trailer tongue weight that the vehicle equipment. This value represents can support using a conventional the heaviest trailer the vehicle can trailer hitch. It may be necessary to tow, but it may be necessary to reduce the overall trailer weight to reduce the trailer weight to stay stay within the maximum trailer within the GCWR, GVWR, maximum tongue weight rating while still trailer tongue load, or GAWR-RR for maintaining the correct trailer load the vehicle. balance. A fifth-wheel or gooseneck Use the Tow Rating Guide hitch may support a higher tongue (my.gmc.com/learn) to determine weight. how much the trailer can weigh, based on the vehicle model and options. Weights listed apply for Gross Vehicle Weight conventional trailers and Rating (GVWR) gooseneck/fifth-wheel trailers unless otherwise noted. For information about the vehicle's maximum load capacity, see Vehicle A step bumper trailer hitch can only Load Limits 0 200. When calculating support a total trailer weight up to the GVWR with a trailer attached, 2 271 kg (5,000 lb). If a trailer hitch the trailer tongue weight must be ball is added to the step bumper, included as part of the weight the check the hitch ball rating to be sure vehicle is carrying. it is higher than the total trailer weight. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 295 The Maximum Trailer Tongue After loading the trailer, separately Weight Rating for a conventional weigh the trailer and then the trailer trailer hitch or a fifth wheel/ tongue and calculate the trailer load gooseneck hitch is shown on the balance percentage to see if the Trailering Information Label. weights and distribution are Do not exceed a maximum trailer appropriate for your vehicle. If the tongue weight of 567 kg (1,250 lb) trailer weight is too high, it may be for a conventional trailer hitch. possible to transfer some of the cargo into your vehicle. If the trailer The trailer tongue weight contributes tongue weight is too high or too low, to the Gross Vehicle Weight (GVW). it may be possible to rearrange GVW includes the curb weight of some of the cargo inside of the your vehicle, any passengers, trailer. cargo, equipment and the trailer The trailer tongue weight (1) should tongue weight. Vehicle options, be 10–15% and fifth-wheel or Do not exceed the maximum passengers, cargo, and equipment gooseneck tongue weight should be allowable tongue weight for your reduce the maximum allowable 15–25% of the total loaded trailer vehicle. Use the shortest hitch tongue weight the vehicle can carry, weight (2). Some specific trailer extension available to position the which also reduces the maximum types, such as boat trailers, fall hitch ball closer to your vehicle. This allowable trailer weight. outside of this range. Always refer will help reduce the effect of the to the trailer owner’s manual for the trailer tongue weight on the trailer Trailer Load Balance recommended trailer tongue weight hitch and the rear axle. The correct trailer load balance for each trailer. Never exceed the If a cargo carrier is used in the must be maintained to ensure trailer maximum loads for the vehicle, trailer hitch receiver, choose a stability. Incorrect load balance is a hitch, and trailer. carrier that positions the load as leading cause of trailer sway. The trailer load balance percentage close to the vehicle as possible. is calculated as: weight (1) divided Make sure the total weight, by weight (2) times 100. including the carrier, is no more than GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

296 Driving and Operating half of the maximum allowable Gooseneck Hitch tongue weight for the vehicle or A gooseneck hitch is designed to be 227 kg (500 lb), whichever is less. coupled to a special hitch leveraging Rear Gross Axle Weight Rating a hitch ball, and is mounted over the (GAWR-RR) rear axle in the truck bed. The GAWR-RR is the total weight Fifth-Wheel Hitch that can be supported by the rear A fifth-wheel hitch is mounted over axle of the vehicle. Do not exceed the rear axle in the truck bed, and the GAWR-RR for the vehicle, with leverages a hinged plate — the the tow vehicle and trailer fully same type of hitch leveraged by loaded for the trip including the semi trucks. Generally, fifth-wheel weight of the trailer tongue. If using The GAWR-RR for the vehicle is on hitches accommodate large trailers a weight-distributing hitch, do not the Trailering Information Label. with as many as one, two, or three exceed the GAWR-RR before axles. applying the Ask your dealer for trailering spring bars. information or assistance. Always use the correct hitch equipment for your vehicle. Towing Equipment Crosswinds, large trucks going by, and rough roads can affect the Hitches trailer and the hitch. Conventional Hitch Proper hitch equipment for your vehicle helps maintain control of the A conventional hitch is bolted to the vehicle-trailer combination. Many frame or cross member of the tow trailers can be towed using a vehicle, and is generally rated Class weight-carrying hitch which has a 2, 3, or 4. coupler latched to the hitch ball, or a tow eye latched to a pintle hook. Other trailers may require a weight-distributing hitch that uses GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 297 spring bars to distribute the trailer tongue weight between your vehicle and trailer axles. Fifth-wheel and gooseneck hitches may also be used. See “Maximum Trailer Tongue Weight” under Trailer Towing 0 292 for weight limits with various hitch types. Avoid sharp turns when using a step-bumper hitch to prevent damage. Make wider turns to prevent contact between your trailer and your bumper. Consider using mechanical sway controls with any trailer. Ask a trailering professional about sway controls or refer to the trailer manufacturer's recommendations and instructions. Weight-Distributing Hitch and Adjustment A weight-distributing hitch may be useful with some trailers. Use the following guidelines to determine if a weight-distributing hitch should be used. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

298 Driving and Operating

Weight-Distributing Hitch Vehicle Series Trailer Weight Usage Hitch Distribution 1500 Up to 3 175 kg (7,000 lb) Not Required 50% 1500 Over 3 175 kg (7,000 lb) Required 50% 2500/3500 Up to 9 080 kg (20,000 lb) Not Required 25%

Towing with Model 1500 Trucks 5. Install and adjust the tension in 1. Position the truck so that the the weight-distributing bars per trailer is ready to connect. the manufacturers’ Keep the trailer detached. recommendations so that the height of the front is 2. Measure the height of the top approximately H2−[(H2−H1)/2] of the front wheel opening at (halfway between the two the fender to the ground (H1). measured ride heights). 3. Attach the vehicle to the trailer. 6. Visually inspect the trailer and Do not attach weight weight-distributing hitch to distribution bars at this time. ensure that the manufacturers’ 4. Measure the height of the top recommendations have of the front wheel opening on been met. 1. Front of Vehicle the fender to the ground (H2). 2. H1/H2 Body to Ground Distance GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 299

Measurement Height Example 1500 (mm) H1 1 000 H2 1 050 H2−H1 50 (H2−H1)/2 25 H2−[(H2−H1)/2] 1 025

Towing with Model 2500/3500 5. Install and adjust the tension in Trucks the weight-distributing bars per 1. Position the truck so that the the manufacturers’ trailer is ready to connect. recommendations so that the Keep the trailer detached. height of the front fender is approximately H2−[(H2−H1)/4] 2. Measure the height of the top (1/4 the difference between the of the front wheel opening at two measured ride heights, the fender to the ground (H1). below the secondary ride 3. Attach the vehicle to the trailer. height {H2}). Do not attach weight 6. Visually inspect the trailer and distribution bars at this time. weight-distributing hitch to 4. Measure the height of the top ensure that the manufacturers’ of the front wheel opening on recommendations have the fender to the ground (H2). been met. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

300 Driving and Operating

Measurement Height Example 2500/3500 (mm) H1 1 040 H2 1 080 H2−H1 40 (H2−H1)/4 10 H2−[(H2−H1)/4] 1 070

Tires sure this weight does not cause the between the top of the pickup box vehicle to exceed GAWR or GVWR. and the bottom of the trailer shelf . Do not tow a trailer while using a Fifth-wheel or gooseneck kingpin that extends over the box. compact on the weight should be 15 25% of the vehicle. – Make sure the hitch is attached to trailer weight up to the maximum the tow rails. Do not . Tires must be properly inflated to amount specified in the trailering use the pickup box for support. support loads while towing a chart for the vehicle. See “Trailer trailer. See Tires 0 379 for Weight" under Trailer Towing 0 292. Safety Chains instructions on proper tire The hitch should be in the pickup inflation. Always attach safety chains bed so that its centerline is over or between the vehicle and the trailer. Fifth-Wheel and Gooseneck slightly in front of the rear axle. Take Instructions about safety chains Trailering care that it is not so far forward that may be provided by the hitch it will contact the back of the cab in manufacturer or by the trailer Fifth-wheel and gooseneck trailers sharp turns. This is especially manufacturer. can be used with many pickup important for short box pickups. If the trailer being towed weighs up models. These trailers place a Trailer pin box extensions and to 2 271 kg (5,000 lb) with a larger percentage of the weight sliding fifth-wheel hitch assemblies factory-installed step bumper, safety (kingpin weight) on the tow vehicle may be used. There should be at chains may be attached to the than conventional trailers. Make least 15 cm (6 in) of clearance GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 301 attaching points on the bumper; maintained properly. Never attempt otherwise, safety chains should be to tap into your vehicle's hydraulic Caution (Continued) attached to holes on the trailer hitch. brake system. If you do, both the may exceed the Cross the safety chains under the vehicle antilock brakes and the trailer brakes may not function, maximum amperage rating of tongue of the trailer to help prevent 30 amps. the tongue from contacting the road which could result in a crash. if it becomes separated from the Auxiliary Battery hitch. Always leave enough slack in Trailer Wiring Harness If equipped, the vehicle's auxiliary the safety chains to allow the Basic Trailer Wiring combination to turn. Never allow battery can be used to supply safety chains to drag on the ground. electrical power to additional If the vehicle is not equipped with a equipment that may be added, such trailer connector on the rear bumper, Trailer Brakes as a slide-in camper. a 7-wire trailering harness is tied to Loaded trailers over 900 kg Locate the auxiliary battery the vehicles frame. The harness (2,000 lb) must be equipped with connector under the hood on the requires the installation of a trailer brake systems and with brakes for driver side of the vehicle, next to the connector, which is available each axle. Trailer braking equipment engine compartment fuse block. through your dealer. conforming to Canadian Standards Follow the proper installation Use only a round, seven-wire Association (CSA) requirement instructions included with any connector with flat blade terminals CAN3-D313, or its equivalent, is electrical equipment that is installed. meeting SAE J2863 specifications recommended. for proper electrical connectivity. State or local regulations may Caution The seven-wire harness contains require trailers to have their own the following trailer circuits: braking system if the loaded weight To prevent draining the auxiliary Stop/Turn of the trailer exceeds certain battery, always turn off electrical Yellow/Blue Signal Left minimums that can vary from state equipment when not in use and to state. Read and follow the do not use any equipment that Stop/Turn Green/Violet instructions for the trailer brakes so (Continued) Signal Right they are installed, adjusted, and GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

302 Driving and Operating

Tail/Parking The trailer connectors contain the Gray/Brown Lamps following circuits. Reverse Lamps White/Green Battery Feed Red/Green Ground White Electric Trailer Blue Brake

Heavy-Duty Trailer Wiring Harness Package 1. Left Turn/Brake If equipped, the trailer wiring harness, with a 7-pin connector and 2. Tail Lamps a 4-pin connector, is mounted on 1. Ground 3. Reverse Lamps the vehicle's rear bumper. 2. Tail Lamps 4. Battery Feed 3. Left Turn/Brake 5. Right Turn/Brake 4. Right Turn/Brake 6. Electric Brakes 7. Ground If equipped, trailering camera connectors are available in the bumper trailer receptacle in place of the four pin connector. The inside trailer auxiliary camera should be installed on the top left hand GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 303

side (A) and the rear trailer auxiliary Tail/Parking Gray/Brown camera (B) should be installed on Lamps the top right hand side. Reverse Lamps White/Green Battery Feed Red/Green Ground White Electric Trailer Blue Brake

If equipped with the heavy-duty trailering option, see “Heavy-Duty Camper/Fifth-Wheel Trailer Wiring Trailer Wiring Harness Package” Package earlier in this section. When the camper-wiring harness is ordered For vehicles without the fifth wheel/ gooseneck trailer package, the without the heavy-duty trailering package, a seven-wire harness with If equipped with the fifth wheel/ seven-wire camper harness is under a seven-pin connector is at the rear gooseneck trailer package, the the rear bumper, attached to the of the vehicle and is tied to the harness connector is mounted on frame near the rear crossmember. vehicle's frame. the inside of the pickup bed behind A connector must be added to the the rear wheel. wiring harness that connects to the Trailer Lamps camper. Always check that all trailer lamps The harness contains the following are working at the beginning of each camper/trailer circuits: trip, and periodically on longer trips. Stop/Turn Yellow/Blue If equipped, the Trailering App will Signal Left monitor the RH turn/brake lamp Stop/Turn circuit, LH turn/brake lamp circuit, Green/Violet Signal Right running lamp circuit, and reverse GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

304 Driving and Operating lamp circuits on the trailer. DIC Tow/Haul Mode is designed to be brake systems. These instructions messages and Trailering App alerts most effective when the vehicle and apply to both types of electric trailer may be displayed if lighting circuit trailer combined weight is at least brakes. issues are detected on the trailer. 75% of the vehicle's Gross Pressing START LIGHT TEST in the Combined Weight Rating (GCWR). See “Trailer Weight” under Trailer Trailering App automatically 0 activates the trailer lamps. The Towing 292. Trailering App is not a substitute for Tow/Haul Mode is most useful when manually inspecting your trailer towing a heavy trailer or carrying a lamps. See Trailering App 0 310. large or heavy load: This symbol is on the Trailer Brake . Through rolling terrain. Turn Signals When Towing a Control Panel on vehicles with an Trailer . In stop-and-go traffic. ITBC system. The power output to When properly connected, the trailer . In busy parking lots. the trailer brakes is proportional to turn signals will illuminate to indicate the amount of vehicle braking. This Operating the vehicle in Tow/Haul the vehicle is turning, changing available power output to the trailer Mode when lightly loaded or not lanes, or stopping. When towing a brakes can be adjusted to a wide towing will not cause damage; trailer, the arrows on the instrument range of trailering situations. however, it is not recommended and cluster will illuminate even if the may result in unpleasant engine and The ITBC system is integrated with trailer is not properly connected or transmission driving characteristics, the vehicle’s brake, antilock brake, the bulbs are burned out. heavy or light steering efforts, and and StabiliTrak/Electronic Stability Tow/Haul Mode reduced fuel economy. Control (ESC) systems. In trailering conditions that cause the vehicle’s For instructions on how to enter Integrated Trailer Brake antilock brake or StabiliTrak/ESC Tow/Haul Mode, see Driver Mode Control System systems to activate, power sent to Control 0 238. the trailer's brakes will be The vehicle may have an Integrated automatically adjusted to minimize Tow/Haul assists when pulling a Trailer Brake Control (ITBC) system heavy trailer or a large or heavy for use with electric trailer brakes or load. See Tow/Haul Mode 0 227. most electric over hydraulic trailer GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 305 trailer wheel lock-up. This does not The trailer symbol on the control imply that the trailer has Warning (Continued) panel will light amber when a trailer StabiliTrak/ESC. with electric brakes is connected. system with electric or electric If the vehicle’s brake, antilock brake, over hydraulic trailer brake The ITBC control panel is on the or StabiliTrak/ESC systems are not systems. center stack. See Instrument Panel functioning properly, the ITBC Overview 0 5. The control panel system may not function fully or at allows adjustment to the amount of all. Make sure all of these systems Trailer Brake Control Panel output, referred to as Trailer Gain, are fully operational to allow the available to the trailer brakes and ITBC system to function properly. allows manual application of the The ITBC system is powered trailer brakes. Use the ITBC control through the vehicle's electrical panel and the DIC trailer brake system. Turning the ignition off will display page to adjust and display also turn off the ITBC system. The power output to the trailer brakes. ITBC system is fully functional only Trailer Brake DIC Display Page when the ignition is in on. The ITBC display page indicates: { Warning . Trailer Gain setting . Output to the trailer brakes Connecting a trailer that has an air brake system may result in . Trailer connection reduced or complete loss of trailer 1. Manual Trailer Brake Apply . System operational status braking, including increased Lever To display: stopping distance or trailer 2. Trailer Symbol instability which could result in 3. Trailer Gain Adjustment . Scroll through the DIC menu serious injury, death, or property Buttons pages damage. Only use the ITBC . Press a Trailer Gain (+) or (−) (Continued) button GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

306 Driving and Operating . Activate the Manual Trailer . A trailer without electric brakes either the vehicle brakes or trailer Brake Apply Lever is connected. No DIC message brakes are applied and properly TRAILER GAIN: Press a Trailer displays. connected. Gain button to recall the current . A trailer with electric brakes has Trailer Gain Adjustment Trailer Gain setting. Each press and become disconnected. Procedure release of the gain buttons will then A CHECK TRAILER WIRING change the Trailer Gain setting. message displays on the DIC. Trailer Gain should be set for a Press the Trailer Gain (+) or (-) to specific trailering condition and it . There is a fault present in the must be readjusted anytime vehicle adjust. Press and hold to wiring to the trailer brakes. continuously adjust the Trailer Gain. loading, trailer loading, or road A CHECK TRAILER WIRING surface conditions change. To turn the output to the trailer off, message displays on the DIC. adjust the Trailer Gain setting to 0.0. This setting can be adjusted from . The ITBC system is not working { Warning 0.0 to 10.0 with a trailer connected due to a fault. A SERVICE or disconnected. TRAILER BRAKE SYSTEM Trailer brakes that are message displays in the DIC. over-gained or under-gained may TRAILER OUTPUT: This displays not stop the vehicle and the trailer anytime a trailer with electric brakes Manual Trailer Brake Apply as intended and can result in a is connected. Output to the trailer Lever brakes is based on the amount of crash. Always follow the vehicle braking present and relative Slide this lever right to apply the instructions to set the Trailer Gain to the Trailer Gain setting. Output is trailer’s electric brakes independent for the proper trailer stopping displayed from 0 to 100% for each of the vehicle’s brakes. Use this performance. gain setting. lever to adjust the Trailer Gain to achieve proper power output to the The Trailer Output will indicate “--- trailer brakes. Under certain To adjust Trailer Gain for each ---” on the Trailer Brake Display circumstances, this lever can also towing condition: Page whenever the following occur: be used to apply additional trailer 1. Drive the vehicle with the trailer . No trailer is connected. braking. The trailer and vehicle attached on a level road brake lamps will come on when surface representative of the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 307 towing condition and free of Other ITBC-Related DIC message will also turn off if it is traffic at about 32–40 km/h Messages acknowledged or if the trailer (20–25 mph) and fully apply harness is reconnected. TRAILER CONNECTED: This the Manual Trailer Brake Apply . There is an electrical fault in the Lever. message will briefly display when a trailer with electric brakes is first wiring to the trailer brakes. This Adjusting Trailer Gain at connected to the vehicle. This message will continue as long speeds lower than 32–40 km/h message will automatically turn off as there is an electrical fault in (20–25 mph) may result in an in about 10 seconds. This message the trailer wiring. This message incorrect gain setting. can be acknowledged before it will also turn off if it is 2. Adjust the Trailer Gain, using automatically turns off. acknowledged. the Trailer Gain (+) or (−) CHECK TRAILER WIRING: This To determine whether the electrical adjustment buttons, to just message will display if: fault is on the vehicle side or trailer below the point of trailer wheel side of the trailer wiring harness lock-up, indicated by trailer . The ITBC system first connection: determines connection to a wheel squeal or tire smoke 1. Disconnect the trailer wiring when a trailer wheel locks. trailer with electric brakes and then the trailer harness becomes harness from the vehicle. Trailer wheel lock-up may not disconnected from the vehicle. 2. Turn the ignition off. occur if towing a heavily loaded trailer. Adjust the Trailer Gain If the disconnect occurs while 3. Wait 10 seconds, then turn the to the highest allowable setting the vehicle is stationary, this ignition back to RUN. for the towing condition. message will automatically turn off in about 30 seconds. This 4. If the CHECK TRAILER 3. Readjust Trailer Gain anytime message will also turn off if it is WIRING message reappears, vehicle loading, trailer loading, acknowledged or if the trailer the electrical fault is on the or road surface conditions harness is reconnected. vehicle side. change or if trailer wheel lock-up is noticed at any time If the disconnect occurs while while towing. the vehicle is moving, this message will continue until the ignition is turned off. This GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

308 Driving and Operating If the CHECK TRAILER WIRING Contact your trailer dealer for message only reappears when assistance with trailer repairs and connecting the trailer wiring harness trailer warranty information. to the vehicle, the electrical fault is on the trailer side. Trailer Sway SERVICE TRAILER BRAKE Control (TSC) SYSTEM: This message will display If TSC is enabled, the Traction Vehicles with StabiliTrak/Electronic when there is a problem with the Control System (TCS)/StabiliTrak/ Stability Control (ESC) have a ITBC system. If this message ESC warning light will flash on the Trailer Sway Control (TSC) feature. continues over multiple ignition instrument cluster. Reduce vehicle Trailer sway is unintended cycles, have the vehicle serviced. speed by gradually removing your side-to-side motion of a trailer while foot from the accelerator. If trailer If either the CHECK TRAILER towing. If the vehicle is towing a sway continues, StabiliTrak/ESC WIRING or SERVICE TRAILER trailer and the TSC detects that can reduce engine torque to help BRAKE SYSTEM message displays sway is increasing, the vehicle slow the vehicle. TSC will not while driving, the ITBC system may brakes are selectively applied at function if StabiliTrak/ESC is turned not be fully functional or may not each wheel, to help reduce off. See Traction Control/Electronic function at all. When traffic excessive trailer sway. If equipped Stability Control 0 235. conditions allow, carefully pull the with the Integrated Trailer Brake vehicle over to the side of the road Control (ITBC) system, and the and turn the ignition off. Check the trailer has an electric brake system, { Warning wiring connection to the trailer and StabiliTrak/ESC may also apply the Trailer sway can result in a crash turn the ignition back on. If either of trailer brakes. these messages continues, either and in serious injury or death, the vehicle or trailer needs service. even if the vehicle is equipped with TSC. A GM dealer may be able to diagnose and repair problems with (Continued) the trailer. However, any diagnosis and repair of the trailer is not covered under the vehicle warranty. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 309 the vehicle’s trailer brake or other Warning (Continued) systems, including integrated Warning (Continued) anti-sway systems, if equipped. If the trailer begins to sway, Messages related to trailer your vehicle and any reduce vehicle speed by connections or trailer brakes could optional equipment installed gradually removing your foot from appear on the DIC. The effects of on your vehicle. the accelerator. Then pull over to these aftermarket devices may have . Before driving, check the check the trailer and vehicle to on vehicle handling or trailer brake trailer brakes are working help correct possible causes, performance is not known. properly, if equipped. Drive including an improperly or the vehicle with the trailer overloaded trailer, unrestrained { Warning attached on a level road cargo, improper trailer hitch surface that is free of traffic configuration, or improperly Use of aftermarket electronic at about 32-40 km/h inflated or incorrect vehicle or trailer sway control devices could (20-25 mph) and fully apply trailer tires. See Towing result in reduced trailer brake the manual trailer brake Equipment 0 296 for trailer ratings performance, loss of trailer apply lever. Also, check the and hitch setup brakes, or other malfunctions, and trailer brake lamps and recommendations. result in a crash. You or others other lamps are functioning could be seriously injured or correctly. Aftermarket Electronic Trailer killed. Before using one of these . If the trailer brakes are not devices: operating properly at any Sway Control Devices time, or if a DIC message . Ask the device or trailer Some trailers may come equipped indicates problems with the manufacturer if the device with an electronic device designed trailer connections or trailer has been thoroughly tested to reduce or control trailer sway. brakes, carefully pull the for compatibility with the Aftermarket equipment vehicle over to the side of make, model, and year of manufacturers also offer similar the road when traffic devices that connect to the wiring (Continued) conditions allow. between the trailer and the vehicle. These devices may interfere with GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

310 Driving and Operating Trailer Tires Overloading is another leading 1. The running lights turn on first cause of trailer tire blow-outs. Never and remain on throughout the Special Trailer (ST) tires differ from load your trailer with more weight sequence. vehicle tires. Trailer tires are than the tires are designed to designed with stiff sidewalls to help 2. The brake lights turn on for support. The load rating is located prevent sway and to support heavy about two seconds. on the trailer tire sidewall. loads. These features can make it 3. The left turn signal light flashes difficult to determine if the trailer tire Always know the maximum speed three times. pressures are low only based on a rating for the trailer tires before visual inspection. driving. This may be significantly 4. The right turn signal light lower than the vehicle tire speed flashes three times. Always check all trailer tire rating. The speed rating may be on pressures before each trip when the 5. The reverse lights turn on for the trailer tire sidewall. If the speed tires are cool. Low trailer tire about two seconds. rating is not shown, the default pressure is a leading cause of trailer trailer tire speed rating is 105 km/h 6. Steps 2–5 repeat for tire blow-outs. (65 mph). approximately one minute and If the vehicle is equipped with a 45 seconds, or until the test trailer tire pressure monitoring Trailering App deactivates. system, see the trailer tire pressure Touch Stop to stop the test. The test monitoring system description and Trailer Light App will automatically end after the trailering app. If equipped, the Trailer Lights App is one minute and 45 seconds. Trailer tires deteriorate over time. on the Home Page of the The sequence also deactivates The trailer tire sidewall will show the infotainment display. when any of the following occur: week and year the tire was Touch Start to cycle the trailer lamps . The ignition is turned off. manufactured. Many trailer tire on and off to determine if they are manufacturers recommend working. The test follows this . The transmission is shifted out replacing tires more than six sequence: of P (Park). years old. . The brake pedal is pressed. . The turn signal is activated. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 311 . The hazard warning lights are When a trailer is electrically A pop-up will indicate the setup is activated. connected and after a Trailer Profile complete. Touch DONE to complete has been created, the trailer the process or touch TRAILER Trailering App detection pop-up will appear with a FEATURE SETUP to set up the If equipped, the Trailering App is on list of all of the custom Trailer Tow/Haul Mode reminder, Trailer the Home Page of the infotainment Profiles made on the vehicle. To Tire Pressure Monitoring System, display. load an existing Trailer Profile, if equipped, maintenance reminders, select one of the Trailer Profiles or towing assistance, if equipped. If equipped this feature allows listed, or load the Guest Trailer profiles for connected trailers to be Profile by selecting GUEST Import a Trailer Profile created to view status, to store and TRAILER. Touching Cancel, A trailer profile saved to an OnStar track trailer usage information, and Accessory/No trailer, or shifting the account can be imported to the to set up towing assistance vehicle from P (Park), will select vehicle. features. Accessory/No trailer as the active 1. Touch Import Profile on the The Trailering App Preview will Trailer Profile and will dismiss the pop-up. appear when the Trailering App is pop- up. opened for the first time from the 2. Select a trailer profile from Home Page. Touch GET STARTED Create a Trailer Profile the list. in the Trailering App to go into 1. Touch Create Profile on the 3. Touch IMPORT. the app. pop-up or touch + Add Trailer in the Trailering App. A pop-up will indicate the import When a trailer is electrically was successful. Touch OK to return connected, there will be an option to 2. Create a name for the trailer. to the trailer list and select the trailer create a profile, use a guest profile, 3. Select the hitch type. profile. The Tow/Haul Mode or cancel. After Cancel is selected a A checklist profile will be reminder, Brake Gain Setting and third time, Don t Remind Me will ’ created based on the type Trailer Tire Pressure sensor display and touching that will turn off selected. learning, if equipped, do not import. the trailer detection pop-up. To turn the Trailer Detection Alert on, select 4. Select the trailer type. ON in the Settings tab. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

312 Driving and Operating Trailer Feature Setup the will sound, the maximum inflation pressure found vehicle’s brake lamps will flash, and on the tire sidewalls. Make sure to Tow/Haul Mode Reminder all working trailer lamps will flash. re-adjust tire pressure to the To turn the Tow/Haul Mode It then moves to the next sensor. recommended level when the Reminder setting on, touch Yes. To To cancel the process touch Stop. process is complete. turn it off, touch No. The recommended tire pressure Sensor Learning Steps Trailer Tire Pressure Setup must be entered for the trailer tires. To complete the sensor-to-vehicle If the Trailer Tire Pressure This allows the vehicle to alert when learn process: the tire pressure is high or low. Monitoring System (TTPMS) is 1. Touch Start on the Learn detected, touch the Tire Pressure TTPMS must learn the location of Sensors screen. The horn Monitoring icon to set up tire the installed tire sensors to show chirps twice and the Learning pressure monitoring.Touch Yes to correct air pressure and Active screen appears on the set up the sensors or touch No to temperature for each tire. To set up, infotainment display. return to the previous screen. use one of the following options or see a tire or trailer dealer for 2. Start with the driver side front A trailer must be electrically trailer tire. connected to the vehicle before service. The learning process must starting the sensor-to-vehicle learn be repeated when the trailer tires 3. Activate the tool near the valve process. are rotated or replaced. See “Editing stem or adjust the air pressure a Trailer Profile” later in this section of this tire until the horn chirps After selecting Start from the Learn for tire pressure sensor relearn and all working vehicle and Sensors screen, use the Tool information. trailer lights flash. Method or the Manual Method (described below) to learn each tire Tool Method: A TTPMS activation The process stops without sensor, during which the current tire tool can be purchased separately to saving the sensor locations if number will be highlighted. learn the sensor locations. this step takes more than two minutes. Each sensor has a minimum of Manual Method: Without the tool, two minutes to learn, shown by a the air pressure can be increased or timer. After a sensor is learned, a decreased in each tire for checkmark appears next to the tire, 10 seconds. Do not exceed the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 313 4. Move to the next tire and before transparent trailer feature . Hitching Point Length: repeat Step 3 for each sensor. can be used. See Assistance 180 cm (70.8 in) – 970 cm The horn chirps twice when all Systems for Parking or Backing (381.8 in). Measure from sensors are completed. 0 257. center of coupler to middle 5. Return to the vehicle to Trailer dimensions must be in range of tires. complete the setup. and transparent trailer must be . Trailer Tongue Length: calibrated prior to use. 50 cm (119.6 in) – 220 cm Maintenance Reminders (86.6 in). Measure from To set up maintenance reminders, Transparent Trailer Setup center of coupler to trailer touch the Trailer Maintenance icon. To complete setup for transparent front wall. Select Yes to set up the trailer: . Vehicle Hitch Height: 10 cm maintenance reminders for the 1. Select the number of axles on (3.9 in) – 100 cm (39.3 in). Trailer Profile. Follow the on-screen the trailer. Measure from ground to top prompts. The maximum number of of coupler. reminders is 50. Select No to return 2. Enter trailer dimensions . Vehicle Hitch Length: 10 cm to the previous screen. . Trailer Length: 300 cm (3.9 in) 100 cm (39.3 in). (118.1 in) 970 cm – Towing Assistance – Measure from hitch receiver (381.8 in). Measure from to center of ball. If the Transparent Trailer feature is center of coupler to furthest available, touch the Towing rear point on the trailer. 3. If trailer dimensions are out of Assistance icon to set up range, this feature will be . Trailer Width: 120 cm transparent trailer. unavailable. Select OK to (47.2 in) 260 cm – return. Touch Yes to begin set up or touch (102.3 in). Measure from No to return to the previous screen. left edge to right edge. 4. Ensure rear trailer camera is connected. Follow the on-screen instructions. . Trailer Height: 1 cm A rear trailer camera must be (0.39 in) – 450 cm 5. Follow instructions to drive mounted on the trailer and (177.1 in). Measure from forward to complete calibration. electrically connected to the vehicle ground to tallest point. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

314 Driving and Operating 6. Return to the vehicle to Truck Transmission Temperature complete the setup. View the temperature of the Status View transmission fluid by looking at the graphic. The graphic will indicate a The Status view shows: dangerous level if the temperature . Truck is at 130 °C–150 °C (270 °F–300 °F). . Connections Connections . Trailer . Maintenance . Cameras Upon entry, the most recent items will be shown. Select MORE to view all options. 1. Transmission Fluid Temperature 2. Average Fuel Economy with Trailer Profile Average Fuel Economy Touch to view the average fuel economy of the vehicle while the 1. Light Test Start Button Trailer Profile is active. 2. Trailer Electrical Diagnostics GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 315 Connections OK Any connector pin that failed will be 3. The left turn signal light flashes If all of the trailer connections are amber color, and the location of the three times. detected (Running Lights, Left Turn corresponding connection will be 4. The right turn signal light Signal Light, Right Turn Signal highlighted on the graphic of the flashes three times. back of the trailer. Light, Reverse Lights, and Electric 5. The reverse lights turn on for Brakes, if equipped), the view will The Running Lights connection may about two seconds. display OK. not detect partial outages. Activate the light test to check all trailer 6. Steps 2–5 repeat for Connection Problem lamps. See “Light Test” following. approximately one minute and If any of the trailer connections are 45 seconds, or until the test If the trailer is not equipped with deactivates. not detected, a message about the reverse lights or electric brakes and connection issue will appear on the you are receiving failure messages Touch Stop to stop the test. The test Driver Information Center (DIC). The in the DIC or on this view, turn off will automatically end after infotainment display will also show the Reverse Lights Alert or the one minute and 45 seconds. the connection issue in the Electric Brakes Alert setting in the Connection Status view. The sequence also deactivates trailer’s profile page. when any of the following occur: Diagnose View Light Test . The ignition is turned off. Touch Diagnose to see more Touch Start Light Test to cycle the information about the connection . The transmission is shifted out trailer lights on and off to determine of P (Park). problem. if they are working. The test follows This view will display the names of this sequence: . The brake pedal is pressed. the trailer connector pins, a graphic 1. The running lights turn on first . The turn signal is activated. of the trailer connector, and a and remain on throughout the . The hazard warning lights are graphic of the back of the trailer. sequence. activated. 2. The brake lights turn on for about two seconds. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

316 Driving and Operating Trailer Trailer Profile. If a tire’s pressure is The Maintenance Status view low or high, the color of the displays reminders. Touch a pressure value will be amber. If a reminder to edit. sensor malfunctions, the values are Touch + New Maintenance dashed lines. If the screen displays Reminder to go to the Select New “Service Tire Pressure Monitoring Reminder view. System”, the vehicle needs to be taken to a dealer for service. The progress bar turns yellow when the maintenance item reaches 90% Maintenance complete. The progress bar turns red when the maintenance item reaches 100% complete. Maintenance Notifications 1. Trailer Tire Pressure/ . Touch Service Complete to reset Temperature the maintenance reminder. 2. Mileage of Trailer . Touch Remind Me Later to delay Mileage the reminder. The mileage accumulated while this . Touch X next to Upcoming Alerts Trailer Profile is active will display. (90%) to dismiss the alert. It will Touch mileage to edit. not appear again. Tire Pressure and Temperature 1. List of Maintenance . Touch X next to Maintenance Reminders If the TTPMS sensor-to-vehicle Due (100%) to delay the alert to learn process was completed, the 2. Add a New Maintenance the next ignition cycle. Reminder status view will display the current Always follow all of the maintenance tire pressure and temperature of the instructions that came with your trailer tires related to the active trailer. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 317 Cameras Guest Trailer Status View Touch p to access a detailed Touch the Guest Trailer Profile for view of each step. Within each the status views. detailed view, touch Next and Previous to navigate between steps. The Guest Trailer Profile Status view shows: Touch Clear All to clear the completed statuses from all items in . Truck the current checklist. . Trailer The checklist is unique to the Trailer . Connections Profile based on hitch type; for example, the steps involve different . Cameras, if equipped details between conventional, The Trailer Status view displays gooseneck, and fifth-wheel hitch mileage information. Touch to edit, types. and follow the on-screen prompts. 1. Rear Trailer Not Connected/ Mileage and fuel economy will reset Custom Checklist Items Preview, if equipped after the trailer disconnects. The For each of the Trailer Profile 2. Interior Trailer Not Cameras Status view displays checklists, there is an option to Connected/Preview, status of trailer cameras. Touch a create custom items to view in the if equipped connected camera to preview the checklist. The custom item will 3. Transparent Trailer Not Set camera image. appear at the bottom of the Up/Preview, if equipped Checklist View checklist. The Cameras Status view displays Guest Trailer and No Trailer status of trailer cameras. This view shows the recommended steps to take before towing a trailer. Connected Touch a connected camera to preview the camera image. Touch the box next to each item if If Guest Trailer Profile is active or if that step has been completed. no trailer is connected, the checklist Touch the Transparent Trailer option will show all of the checklists to enter Transparent Trailer Setup if setup is not complete. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

318 Driving and Operating associated with Custom Trailer track total mileage or fuel economy, If a Trailer Profile is already active Profiles in addition to default but the system will track trip mileage and the brake gain setting had been checklists. and fuel economy if the Guest set for that Trailer Profile, the quick Trailer Profile is active. The Trailer notice will trigger whenever the Trailers View Tire Pressure Monitoring System or ignition is turned on. Touch the Trailers tab to view, maintenance reminders cannot be If there was an error in setting the activate, create, edit, or delete set up for a Guest Trailer Profile. brake gain for a Trailer Profile, there Trailer Profiles. The Guest Trailer Profile cannot be will be a notification. This pop-up edited. If a trailer is connected, touch the will not appear if the Guest Trailer Trailer Profile name to activate a Touch p to learn more about the Profile is active or if there is no Trailer Profile. Guest Trailer option. trailer connected. There can be up to five Custom No Trailer Connected Trailer brake gain should be set for Trailer Profiles on the vehicle. a specific trailering condition and When there is no trailer connected, must be adjusted anytime vehicle The Custom Trailer Profiles and Trailer Profiles cannot be activated loading, trailer loading, or road Guest Trailer are in order of the but most options can be edited. surface conditions change. most frequently used. Trailer Brake Gain Memory All personalization features are Editing a Trailer Profile based on the settings for each The system can memorize the brake Trailer Profile View driver in vehicle personalization. gain setting of a Trailer Profile or a The list of Trailer Profiles is based Guest Trailer Profile. When a Trailer Touch to edit any of the following on vehicle personalization settings. Profile or Guest Trailer Profile is options in the Trailer Profile view: selected, and a brake gain setting is . Trailer Name Guest Trailer set for that Trailer Profile, a quick If the Guest Trailer Profile is the notice will appear to indicate that . Towing Assistance Setup active Trailer Profile, trailer the system has recalled that . Tire Pressure Setup profile s brake gain setting. detection, connections status, theft, ’ . Trailer Maintenance and the Tow/Haul reminder alerts can be sent. The system will not . Mileage GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 319 . Average Fuel Economy previously in this section for details relearning process. See “Trailer Tire . Reverse Lights Alert on the setup. Also, touch Tire Pressure Setup” previously in this Pressure Setup if the trailer tires section. . Electric Brakes Alert were rotated or if the tire pressure On the Learn Sensors screen, touch Touch Save to save the new value sensors in the tires were replaced Next to go to the Edit to the Trailer Profile. Touching Back for this Trailer Profile. The vehicle Recommended Tire Pressure will still save the previously entered will need to relearn the tire sensors screen. information. and their locations. On the Edit Recommended Tire Trailer Name If TTPMS had been set up Pressure screen, touch a number on previously, the Select Number of the keypad to change the Touch to edit the Trailer Profile’s Sensors screen will appear after name. Use at least one character touching Tire Pressure Setup. If the Recommended Tire Pressure for the and no spaces. Touch Save. number of sensors has changed, trailer’s tires. This will change the number at which the vehicle Towing Assistance Setup select the number and touch Next. displays alerts related to trailer tire A trailer should be connected to If a new number of sensors is pressure. Touch Done to return to complete this portion of profile selected, the Relearn Sensors the Trailer Profile view. setup. pop-up will appear. Touch Cancel to go back or touch Relearn to Trailer Maintenance Touch to set up the Transparent overwrite the current sensors and Trailer feature for the Trailer Profile. begin the relearning process. See Touch to view a list of maintenance See "Transparent Trailer Setup" “Trailer Tire Pressure Setup” reminders for the Trailer Profile. under "Towing Assistance" for previously in this section. details on the setup. Touch a reminder to view, reset, If number of sensors has not delete, or edit it. Tire Pressure Setup changed, touch Next and the Learn Reset Reminder Touch to set up the Trailer Tire sensors screen will appear. Touch Maintenance Complete in the Pressure Monitoring System On the Learn Sensors screen. reminder view to reset the reminder. (TTPMS) for the Trailer Profile. See Touch Relearn to overwrite the On the pop-up, touch Reset to reset “Trailer Tire Pressure Setup” current sensors and begin the the time and mileage values for the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

320 Driving and Operating reminder. Touch Cancel to return to Mileage Electric Brakes Alert the previous view and nothing will Touch to edit the Trailer Profile’s Turn on to receive failure messages change. mileage. about the electric trailer brakes. Edit Reminder Turn off to not receive failure Effect on Maintenance Reminders messages about the electric trailer Touch to edit the mileage or time If the mileage is reset or changed, brakes, unless they are later settings for the reminder. Touch and mileage has already detected. This setting cannot be Save to save the new settings to the accumulated, any maintenance edited when the Trailer Profile is Trailer Profile. reminders that have been set up will inactive or when the trailer is Delete Reminder be adjusted accordingly. disconnected. Touch to delete the maintenance Average Fuel Economy Delete Trailer reminder. On the pop-up, touch Touch to reset the average fuel Touch to delete the Trailer Profile Delete to delete the reminder or economy for the Trailer Profile. and all of its settings. touch Cancel to return to the Touch Reset to change, or touch On the pop-up, touch Delete to previous view and nothing will Cancel to go back to the change. delete the Trailer Profile. Touch previous view. Cancel to dismiss the pop-up and New Maintenance Reminder Reverse Lights Alert return to the previous view. Touch + New Maintenance Turn on to receive failure messages Settings View Reminder to set up a new reminder. about the reverse lights. Turn off to Suggested reminders that were not receive failure messages about Within the Trailering App, touch the previously set will have checkmarks the reverse lights, unless they are Settings tab to modify the following next to them. Suggested reminders later detected. This setting cannot settings: that have not been set will have be edited when the Trailer Profile is . Trailer Detection Alert empty boxes next to them. The inactive or when the trailer is . Maintenance Alerts maximum number of reminders disconnected. is 50. . Theft Alert . Tow/Haul Mode Reminder GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 321 Trailer Detection Alert Turn a setting off to not receive any smartphone number has been of the Maintenance Alerts when that added to the account for this The Trailer Detection Alert setting Trailer Profile is active. notification. will be on by default. Turn it off to disable the Trailer Detection pop-up Theft Alert If the setting is turned off for a given from displaying when a trailer is Trailer Profile, the smartphone will connected. The Guest Trailer Profile A theft alert can be set if a trailer is not receive this security notification will become the active Trailer connected and the alert is enabled. even if the Trailer Profile is active. Profile, unless another Trailer Profile When the trailer is disconnected is selected manually through the and the vehicle is off, an alarm will Tow/Haul Mode Reminder Trailering App. If this setting is sound. This is a reminder to turn on the disabled while a Custom Trailer Touch Theft Alert in Settings to view Tow/Haul Mode when towing a Profile is active, that Trailer Profile the Theft Alert settings page. These trailer. See Tow/Haul Mode 0 227. will remain the active profile until the alerts are based on the Trailer Touch Tow/Haul Mode Reminder in trailer is disconnected. Profile, so the settings for each Settings to view the Tow/Haul Mode Trailer Profile must be turned on or Maintenance Alerts Reminder settings page. These off. Touch a profile to view more alerts are based on the Trailer Touch Maintenance Alerts to view information or adjust the setting for Profile, so the settings for each the Maintenance Alerts settings that profile. Trailer Profile must be turned on or page. These alerts are based on the This setting will be off by default for off. Touch a profile to view more Trailer Profile, so the settings for each Trailer Profile, including the information or to adjust the setting each Trailer Profile must be turned Guest Trailer Profile. for that profile. on or off. Touch a profile to view more information or adjust the A smartphone will receive a This setting will default to OFF for setting for that profile. notification that the trailer related to each Trailer Profile, including the the selected Trailer Profile is Guest Trailer Profile. The setting will be on by default for disconnected from the vehicle, if the each profile. All Maintenance Alerts setting is on for the active Trailer for that active Trailer Profile will be Profile, the vehicle has an OnStar or received. connected service plan and the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

322 Driving and Operating If Tow/Haul Mode is off and this Conversions and setting is on for a Trailer Profile, Caution each time the ignition is turned on a Add-Ons reminder will appear to turn on Tow/ Some electrical equipment can Haul Mode when the Trailer Profile Add-On Electrical damage the vehicle or cause is active. components to not work and Equipment would not be covered by the If Tow/Haul Mode is on and this vehicle warranty. Always check setting is on for a Trailer Profile, the { Warning with your dealer before adding reminder will not appear when the electrical equipment. Trailer Profile is active. The Data Link Connector (DLC) is used for vehicle service and Emission Inspection/Maintenance Add-on equipment can drain the testing. See Malfunction vehicle's 12-volt battery, even if the vehicle is not operating. Indicator Lamp (Check Engine Light) 0 137. A device connected The vehicle has an airbag system. to the DLC — such as an Before attempting to add anything aftermarket fleet or electrical to the vehicle, see driver-behavior tracking device — Servicing the Airbag-Equipped 0 may interfere with vehicle Vehicle 82 and systems. This could affect vehicle Adding Equipment to the 0 operation and cause a crash. Airbag-Equipped Vehicle 82. Such devices may also access For information on wiring auxiliary information stored in the vehicle’s switches, see www.gmupfitter.com systems. or contact your dealer. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 323 Adding a Snow Plow or much if there is other equipment Caution (Continued) already adding to the weight of the Similar Equipment vehicle. installed. The vehicle can be Caution damaged if either the front or rear To safely carry a snow plow on the axle ratings or the Gross Vehicle vehicle: Do not exceed 72 km/h (45 mph) Weight Rating (GVWR) are . Follow all aftermarket snow plow with a snow plow mounted to the exceeded. manufacturer’s instructions for vehicle. The vehicle could the operation and transportation of the snow plow. overheat and be damaged. The plow the vehicle can carry depends on many things, such as: . With a snow plow attached, the engine coolant temperature Before installing a snow plow on the . The options the vehicle came vehicle, follow these guidelines: with, and the weight of those gauge may show a higher temperature than while driving options. Caution without one. The snow plow . The weight and number of could block the airflow to the If the vehicle does not have the passengers to be carried. radiator. This could be more snow plow prep package, RPO . The weight of items added to the noticeable as vehicle speed VYU, adding a plow can damage vehicle, like a tool box or increases. At speeds above the vehicle, and the repairs would truck cap. 72 km (45 mph), this may cause the engine coolant to overheat. not be covered by the vehicle . The total weight of any warranty. Unless the vehicle was additional cargo to be carried. . To increase the airflow, move the built to carry a snow plow, do not snow plow blade postion. For example, if the snow plow add one to the vehicle. If the . If driving more than 24 km vehicle has RPO VYU, then the weighs 318 kg (700 lb), the total weight of all occupants and cargo (15 mi), angle the plow blade payload the vehicle can carry will inside the cab should not exceed position. be reduced when a snow plow is 135 kg (300 lb). This means that you (Continued) may only be able to carry one passenger. Even this may be too GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

324 Driving and Operating . Make sure the weight on the Front axle reserve capacity is the front and rear axles does not difference between the Gross Axle exceed the axle rating for each. Weight Rating (GAWR) and the front . For the front axle, if more cargo axle weight of the vehicle with full or passengers must be carried, fuel and passengers. This is the appropriate counter ballast must amount of weight that can be added be installed rear of the rear axle. to the front axle before reaching the Counter ballast must be properly front GAWR. secured so it will not move during driving. . Rear ballast may be required to ensure a proper front and rear Canada weight distribution ratio, even though the actual weight at the The front axle reserve capacity for front axle may be less than the the vehicle is in the lower right front axle rating. corner of the Certification/Tire label. . The snow plow manufacturer or To calculate the amount of weight installer can assist in any front accessory, such as a snow determining the amount of rear plow, is adding to the front axle, use this formula: ballast required, to help make United States sure the snow plow/vehicle combination does not exceed the GVW rating, the front and rear axle ratings, and the front and rear weight distribution ratio. . The total vehicle must not exceed the GVW rating. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Driving and Operating 325 For example, adding a 318 kg (700 lb) snow plow actually adds { Warning more than 318 kg (700 lb) to the front axle. Using the formula, if the On some vehicles that have snow plow is 122 cm (4 ft) in front of certain front mounted equipment, the front axle and the is such as a snow plow, it may be 305 cm (10 ft), then: possible to load the front axle to W = 318 kg (700 lb) the front Gross Axle Weight A = 122 cm (4 ft) Rating (GAWR) but not have W.B. = 305 cm (10 ft) enough weight on the rear axle to have proper braking performance. (W x (A + W.B.)/W.B. = (318 x (122 + 305))/305 = 445 kg If the brakes cannot work properly, the vehice could crash. (W x (A + W.B.)) /W.B.= Weight the (980 lb) Always follow the snow plow accessory is adding to the This means if the front axle reserve front axle. manufacturer or installer's capacity is more than 445 kg recommendation for rear ballast Where: (980 lb), the snow plow could be to ensure a proper front and rear W = Weight of added accessory added without exceeding the weight distribution ratio. front GAWR. A = Distance that the accessory Maintaining a proper front and is in front of the front axle Heavier equipment can be added on rear weight distribution ratio is W.B. = Vehicle Wheelbase the front of the vehicle if less cargo necessary to provide proper or fewer passengers are carried, braking performance. or by positioning cargo toward the rear. This reduces the load on the front. However, the front GAWR, Total vehicle reserve capacity is the rear GAWR, and Gross Vehicle difference between the GVWR and Weight Rating (GVWR) must never the weight of the truck with full fuel be exceeded. and passengers. It is the amount of weight that can be added to the vehicle before reaching the GVWR. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

326 Driving and Operating Reserve capacity numbers are Pickup Conversion to intended as a guide when selecting the amount of equipment or cargo Chassis Cab the truck can carry. If unsure of the We are aware that some vehicle vehicle's front, rear, or total weight, owners might consider having the go to a weigh station and weigh the pickup box removed and a vehicle. Your dealer can also help commercial or recreational body with this. installed. Owners should be aware The total vehicle reserve capacity that, as manufactured, there are for the vehicle is in the lower right differences between a chassis cab corner of the Certification/Tire label and a pickup with the box removed as shown previously. which could affect vehicle safety. The components necessary to adapt See your dealer for additional a pickup to permit its safe use with advice and information about using a specialized body should be a snow plow on the vehicle. Also, installed by the body builder. see Vehicle Load Limits 0 200. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 327 Power Steering Fluid ...... 354 Headlamps, Front Turn Signal, Vehicle Care Washer Fluid ...... 354 Sidemarker, and Parking Brakes ...... 355 Lamps ...... 367 Brake Pad Life System ...... 356 Taillamps, Turn Signal, General Information ...... 357 Stoplamps, and Back-Up General Information ...... 328 Battery - North America ...... 358 Lamps ...... 368 California Proposition Four-Wheel Drive ...... 361 Center High-Mounted 65 Warning ...... 329 Front Axle ...... 361 Stoplamp (CHMSL) and California Perchlorate Rear Axle ...... 362 Cargo Lamp ...... 369 Materials Requirements . . . . . 329 Noise Control System ...... 362 License Plate Lamp ...... 369 Accessories and Starter Switch Check ...... 363 Modifications ...... 329 Automatic Transmission Shift Electrical System Lock Control Function Electrical System Overload . . . 370 Vehicle Checks Fuses and Circuit Breakers . . . 370 Doing Your Own Check ...... 363 Ignition Transmission Lock Engine Compartment Fuse Service Work ...... 330 Block ...... 371 Hood ...... 330 Check ...... 363 Park Brake and P (Park) Instrument Panel Fuse Engine Compartment Block (Left) ...... 374 Overview ...... 332 Mechanism Check ...... 364 Wiper Blade Replacement . . . . 364 Instrument Panel Fuse Block Engine Oil ...... 339 (Right) ...... 376 Engine Oil Life System ...... 341 Windshield Replacement . . . . . 365 Automatic Transmission Gas Strut(s) ...... 365 Wheels and Tires Fluid ...... 343 Headlamp Aiming Tires ...... 379 Engine Air Filter Life Front Headlamp Aiming ...... 366 All-Season Tires ...... 379 System ...... 343 Winter Tires ...... 380 Engine Air Cleaner/Filter ...... 344 Bulb Replacement Low-Profile Tires ...... 380 Cooling System ...... 346 Bulb Replacement ...... 367 All-Terrain Tires ...... 381 Engine Overheating ...... 351 Halogen Bulbs ...... 367 Tire Sidewall Labeling ...... 381 Overheated Engine Protection LED Lighting ...... 367 Tire Designations ...... 383 Operating Mode ...... 352 Tire Terminology and Engine Fan ...... 353 Definitions ...... 385 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

328 Vehicle Care Tire Pressure ...... 387 Jump Starting General Information Tire Pressure for High-Speed Jump Starting - North Operation ...... 389 America ...... 419 For service and parts needs, visit Tire Pressure Monitor your dealer. You will receive System ...... 389 Towing the Vehicle genuine GM parts and GM-trained Tire Pressure Monitor Towing the Vehicle ...... 424 and supported service people. Operation ...... 390 Recreational Vehicle Towing ...... 424 Genuine GM parts have one of Tire Inspection ...... 396 these marks: Tire Rotation ...... 396 Appearance Care When It Is Time for New Exterior Care ...... 429 Tires ...... 399 Interior Care ...... 435 Buying New Tires ...... 399 Floor Mats ...... 438 Different Size Tires and Wheels ...... 401 Uniform Tire Quality Grading ...... 402 and Tire Balance ...... 403 Wheel Replacement ...... 403 Tire Chains ...... 404 If a Tire Goes Flat ...... 405 Tire Changing ...... 407 Full-Size Spare Tire ...... 418 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 329 California Proposition California Perchlorate Damage to suspension components caused by modifying vehicle height 65 Warning Materials Requirements outside of factory settings will not be Certain types of automotive covered by the vehicle warranty. { Warning applications, such as airbag Damage to vehicle components initiators, seat belt pretensioners, Most motor vehicles, including resulting from modifications or the and lithium batteries contained in installation or use of non-GM this one, as well as many of its electronic keys, may contain service parts and fluids, contain certified parts, including control perchlorate materials. Perchlorate module or software modifications, is and/or emit chemicals known to Material – special handling may not covered under the terms of the the State of California to cause apply. See www.dtsc.ca.gov/ vehicle warranty and may affect cancer and birth defects or other hazardouswaste/perchlorate. remaining warranty coverage for reproductive harm. Engine affected parts. exhaust, many parts and Accessories and systems, many fluids, and some Modifications GM Accessories are designed to component wear by-products complement and function with other contain and/or emit these Adding non-dealer accessories or systems on the vehicle. See your chemicals. For more information making modifications to the vehicle dealer to accessorize the vehicle using genuine GM Accessories go to www.P65Warnings.ca.gov/ can affect vehicle performance and installed by a dealer technician. passenger-vehicle. safety, including such things as airbags, braking, stability, ride and Also, see Adding Equipment to the handling, emissions systems, Airbag-Equipped Vehicle 0 82. See Battery - North America 0 358 aerodynamics, durability, and and electronic systems like antilock Jump Starting - North America brakes, traction control, and stability 0 419 and the back cover. control. These accessories or modifications could even cause malfunction or damage not covered by the vehicle warranty. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

330 Vehicle Care Vehicle Checks If equipped with remote vehicle start, open the hood before Warning (Continued) performing any service work to Doing Your Own prevent remote starting the vehicle vehicle is on, the engine will start Service Work accidentally. See Remote Vehicle when the hood is opened. You or Start 0 25. others could be injured. { Warning Keep a record with all parts receipts and list the mileage and the date of It can be dangerous to work on any service work performed. See { Warning your vehicle if you do not have Maintenance Records 0 456. the proper knowledge, service Components under the hood can manual, tools, or parts. Always Caution get hot from running the engine. follow owner’s manual procedures To help avoid the risk of burning and consult the service manual Even small amounts of unprotected skin, never touch for your vehicle before doing any contamination can cause damage these components until they have service work. to vehicle systems. Do not allow cooled, and always use a glove or contaminants to contact the fluids, towel to avoid direct skin contact. If doing some of your own service reservoir caps, or dipsticks. work, use the proper service Clear any snow from the hood manual. It tells you much more Hood before opening. about how to service the vehicle than this manual can. To order the To open the hood: proper service manual, see { Warning 1. Pull the hood release lever with Publication Ordering Information the i symbol. It is on the 0 471. For vehicles with auto engine stop/start, turn the vehicle off lower left side of the instrument This vehicle has an airbag system. before opening the hood. If the panel. Before attempting to do your own service work, see Servicing the (Continued) Airbag-Equipped Vehicle 0 82. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 331 2. Pull the hood down until the strut system is no longer holding up the hood. 3. Allow the hood to fall. Check to make sure the hood is latched completely. Repeat this process with additional force if necessary.

{ Warning

Do not drive the vehicle if the 2. Go to the front of the vehicle hood is not latched completely. and locate the secondary The hood could open fully, block release lever under the front your vision, and cause a crash. center of the hood. Push the You or others could be injured. secondary hood release lever Always close the hood completely to the right to release. before driving. 3. After you have partially lifted the hood, the gas strut system The Driver Information Center (DIC) will automatically lift the hood will display a message if the hood is and hold it in the fully open not fully closed, and the vehicle is position. moving. Stop and turn off the To close the hood: vehicle, check the hood for obstructions, and close the hood 1. Before closing the hood, be again. Check to see if the message sure all filler caps are on still appears on the DIC. properly, and all tools are removed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

332 Vehicle Care Engine Compartment Overview

2.7L L4 Engine (L3B) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 333 1. Remote Negative (–) Location. 11. Windshield Washer Fluid See Jump Starting - North Reservoir. See “Adding Washer America 0 419. Fluid” under Washer Fluid 0 2. Positive (+) Terminal (Under 354. Cover). See Jump Starting - North America 0 419. 3. Battery - North America 0 358. 4. Engine Compartment Fuse Block 0 371. 5. Engine Cooling Fans (Out of View). See Cooling System 0 346. 6. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine Oil 0 339. 7. Engine Oil Dipstick. See “Checking Engine Oil” under Engine Oil 0 339. 8. Coolant Surge Tank and Pressure Cap. See Cooling System 0 346. 9. Engine Air Cleaner/Filter 0 344. 10. Brake Fluid Reservoir. See Brake Fluid 0 357. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

334 Vehicle Care

4.3L V6 Engine (LV3) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 335 1. Remote Negative (–) Location. 11. Windshield Washer Fluid See Jump Starting - North Reservoir. See “Adding Washer America 0 419. Fluid” under Washer Fluid 0 2. Positive (+) Terminal (Under 354. Cover). See Jump Starting - North America 0 419. 3. Battery - North America 0 358. 4. Engine Compartment Fuse Block 0 371. 5. Engine Cooling Fans (Out of View). See Cooling System 0 346. 6. Engine Oil Dipstick. See “Checking Engine Oil” under Engine Oil 0 339. 7. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine Oil 0 339. 8. Coolant Surge Tank and Pressure Cap. See Cooling System 0 346. 9. Engine Air Cleaner/Filter 0 344. 10. Brake Fluid Reservoir. See Brake Fluid 0 357. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

336 Vehicle Care

5.3L V8 Engine (L84) Shown, 5.3L V8 Engine (L82) and 6.2L V8 Engine (L87) Similar GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 337 1. Remote Negative (–) Location. 11. Windshield Washer Fluid See Jump Starting - North Reservoir. See “Adding Washer America 0 419. Fluid” under Washer Fluid 0 2. Positive (+) Terminal (Under 354. Cover). See Jump Starting - North America 0 419. 3. Battery - North America 0 358. 4. Engine Compartment Fuse Block 0 371. 5. Engine Oil Dipstick. See “Checking Engine Oil” under Engine Oil 0 339. 6. Engine Cooling Fans (Out of View). See Cooling System 0 346. 7. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine Oil 0 339. 8. Coolant Surge Tank and Pressure Cap. See Cooling System 0 346. 9. Engine Air Cleaner/Filter 0 344. 10. Brake Fluid Reservoir. See Brake Fluid 0 357. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

338 Vehicle Care

6.6L V8 Engine (L8T) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 339 1. Remote Negative (–) Location. 12. Coolant Surge Tank and . Check the engine oil level See Jump Starting - North Pressure Cap. See Cooling regularly and maintain the America 0 419. System 0 346. proper oil level. See “Checking 2. Positive (+) Terminal (Under 13. Windshield Washer Fluid Engine Oil” and “When to Add Engine Oil in this section. Cover). See Jump Starting - Reservoir. See “Adding Washer ” North America 0 419. Fluid” under Washer Fluid . Change the engine oil at the 0 3. Battery - North America 0 358. 354. appropriate time. See Engine Oil Life System 0 341. 4. Engine Air Cleaner/Filter 0 344. If the vehicle has a diesel engine, see the Duramax diesel . Always dispose of engine oil 5. Engine Oil Dipstick. See supplement. properly. See “What to Do with “Checking Engine Oil” under Used Oil” in this section. Engine Oil 0 339. Engine Oil Checking Engine Oil 6. Engine Cooling Fan (Out of For diesel engine vehicles, see View). See Cooling System Check the engine oil level regularly, “Engine Oil” in the Duramax diesel 0 346. every 650 km (400 mi), especially supplement. prior to a long trip. The engine oil 7. Power Steering Fluid To ensure proper engine dipstick handle is a loop. See Reservoir. See Power Steering 0 performance and long life, careful Engine Compartment Overview Fluid 354. attention must be paid to engine oil. 0 332 for the location. 8. Engine Oil Fill Cap. See “When Following these simple, but to Add Engine Oil” under important steps will help protect { Warning Engine Oil 0 339. your investment: 9. Auxiliary Battery. Battery - . Use engine oil approved to the The engine oil dipstick handle North America 0 358. proper specification and of the may be hot; it could burn you. proper viscosity grade. See Use a towel or glove to touch the 10. Brake Fluid Reservoir. See Selecting the Right Engine Oil dipstick handle. Brake Fluid 0 357. “ ” in this section. 11. Engine Compartment Fuse Block 0 371. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

340 Vehicle Care If a low oil Driver Information Center When to Add Engine Oil (DIC) message displays, check the Caution (Continued) oil level. above the operating range (i.e., Follow these guidelines: the engine has so much oil that . To get an accurate reading, park the oil level gets above the the vehicle on level ground. cross-hatched area that shows Check the engine oil level after the proper operating range), the the engine has been off for at engine could be damaged. Drain least two hours. Checking the If the oil is below the cross-hatched the excess oil or limit driving of engine oil level on steep grades area at the tip of the dipstick and the vehicle, and seek a service or too soon after engine shutoff the engine has been off for at least professional to remove the can result in incorrect readings. 15 minutes, add 1 L (1 qt) of the excess oil. Accuracy improves when recommended oil and then recheck checking a cold engine prior to the level. See “Selecting the Right starting. Remove the dipstick Engine Oil” later in this section for See Engine Compartment Overview 0 and check the level. an explanation of what kind of oil to 332 for the location of the engine use. For engine oil crankcase oil fill cap. . If unable to wait two hours, the capacity, see Capacities and engine must be off for at least Add enough oil to put the level Specifications 0 458. 15 minutes if the engine is somewhere in the proper operating warm, or at least 30 minutes if range. Push the dipstick all the way the engine is not warm. Pull out Caution back in when through. the dipstick, wipe it with a clean Selecting the Right Engine Oil paper towel or cloth, then push it Do not add too much oil. Oil back in all the way. Remove it levels above or below the Selecting the right engine oil again, keeping the tip down, and acceptable operating range depends on both the proper oil check the level. shown on the dipstick are harmful specification and viscosity grade. to the engine. If the oil level is See Recommended Fluids and 0 (Continued) Lubricants 452. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 341 Specification Use SAE 5W-30 viscosity grade What to Do with Used Oil engine oil for the 2.7L L4, 4.3L Use full synthetic engine oils that Used engine oil contains certain V6 and 6.6L V8 engines. Cold meet the dexos1 specification. elements that can be unhealthy for Temperature Operation: In an area Engine oils that have been your skin and could even cause of extreme cold, where the approved by GM as meeting the cancer. Do not let used oil stay on temperature falls below −29 °C dexos1 specification are marked your skin for very long. Clean your (−20 °F), use SAE 0W-30 oil. An oil with the dexos1 approved logo. skin and nails with soap and water, of this viscosity grade will provide or a good hand cleaner. Wash or easier cold starting for the engine at properly dispose of clothing or rags extremely low temperatures. containing used engine oil. See the When selecting an oil of the manufacturer's warnings about the appropriate viscosity grade, it is use and disposal of oil products. recommended to select an oil of the Used oil can be a threat to the correct specification. See environment. If you change your Specification earlier in this section. “ ” own oil, be sure to drain all the oil Caution Engine Oil Additives/Engine from the filter before disposal. Never dispose of oil by putting it in the Failure to use the recommended Oil Flushes trash or pouring it on the ground, engine oil or equivalent can result Do not add anything to the oil. The into sewers, or into streams or in engine damage not covered by recommended oils meeting the bodies of water. Recycle it by taking the vehicle warranty. dexos1 specification are all that is it to a place that collects used oil. needed for good performance and engine protection. Viscosity Grade Engine Oil Life System Engine oil system flushes are not Use SAE 0W-20 viscosity grade recommended and could cause When to Change Engine Oil engine oil for the 5.3L and 6.2L engine damage not covered by the V8 engines. This vehicle has a computer system vehicle warranty. that indicates when to change the engine oil and filter. This is based on a combination of factors which GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

342 Vehicle Care include engine revolutions, engine the oil regularly over the course of controls, for several seconds. temperature, and miles driven. an oil drain interval and keep it at When the confirmation Based on driving conditions, the the proper level. message displays, select YES. mileage at which an oil change is If the system is ever reset The oil life will change indicated can vary considerably. For accidentally, the oil must be to 100%. the oil life system to work properly, changed at 5 000 km (3,000 mi) The oil life system can also be reset the system must be reset every time since the last oil change. as follows: the oil is changed. Remember to reset the oil life 1. Display the oil life percentage On some vehicles, when the system system whenever the oil is changed. on the DIC. See Driver has calculated that oil life has been Information Center (DIC) (Base diminished, a CHANGE ENGINE How to Reset the Engine Oil Life System Level) 0 147 or OIL SOON message comes on to Driver Information Center (DIC) indicate that an oil change is Reset the system whenever the (Midlevel and Uplevel) 0 148. necessary. Change the oil as soon engine oil is changed so that the as possible within the next 1 000 km system can calculate the next 2. Fully press the accelerator (600 mi). It is possible that, if driving engine oil change. Always reset the pedal slowly three times within under the best conditions, the oil life engine oil life to 100% after every oil five seconds. system might indicate that an oil change. It will not reset itself. To 3. If the display changes to 100%, change is not necessary for up to a reset the engine oil life system: the system is reset. year. The engine oil and filter must be changed at least once a year 1. Display the oil life percentage If the vehicle has a CHANGE and, at this time, the system must on the DIC. See Driver ENGINE OIL SOON message and it Information Center (DIC) (Base comes back on when the vehicle is be reset. For vehicles without the 0 CHANGE ENGINE OIL SOON Level) 147 or started and/or the oil life percentage Driver Information Center (DIC) is near 0%, the engine oil life message, an oil change is needed 0 when the REMAINING OIL LIFE (Midlevel and Uplevel) 148. system has not been reset. Repeat percentage is near 0%. Your dealer 2. Press the thumbwheel on the the procedure. has trained service people who will steering wheel, or the trip perform this work and reset the odometer reset stem if the system. It is also important to check vehicle does not have DIC GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 343 Automatic Transmission When to Change the Engine Caution (Continued) Fluid Air Filter not be covered by the vehicle When the Driver Information Center When to Check and Change warranty. Always use the correct (DIC) displays a message to replace Automatic Transmission Fluid automatic transmission fluid. See the engine air filter at the next oil It is usually not necessary to check Recommended Fluids and change, follow this timing. the transmission fluid level. The only Lubricants 0 452. When the DIC displays a message reason for fluid loss is a to replace the engine air filter soon, transmission leak or overheated Change the fluid and filter at the replace the engine air filter at the transmission. This vehicle is not scheduled maintenance intervals earliest convenience. equipped with a transmission fluid listed in Maintenance Schedule level dipstick. There is a special The system must be reset after the 0 441. Be sure to use the procedure for checking and engine air filter is changed. transmission fluid listed in changing the transmission fluid in Recommended Fluids and If the DIC displays a message to these vehicles. Because this Lubricants 0 452. check the engine air filter system, procedure is difficult, this should be see your dealer. done at the dealer. Contact the dealer for additional information or Engine Air Filter Life How to Reset the Engine Air the procedure can be found in the System Filter Life System service manual. See Publication If equipped, this feature provides To reset: Ordering Information 0 471. the engine air filter’s remaining life 1. Place the vehicle in P (Park). and best timing for a change. The Caution timing to change an engine air filter 2. Display the Air Filter Life on the depends on driving and DIC. See Driver Information Use of the incorrect automatic environmental conditions. Center (DIC) (Base Level) transmission fluid may damage 0 147 or the vehicle, and the damage may Driver Information Center (DIC) 0 (Continued) (Midlevel and Uplevel) 148. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

344 Vehicle Care 3. Press T on the steering wheel, How to Inspect/Replace the To inspect or replace the engine air or press the trip odometer reset Engine Air Cleaner/Filter cleaner/filter: stem if the vehicle does not Do not start the engine or have the have DIC controls, to move to engine running with the engine air the Reset/Disable display area. cleaner/filter housing open. Before Select Reset then press the removing the engine air cleaner/ thumbwheel or press the reset filter, make sure that the engine air stem for several seconds. cleaner/filter housing and nearby 4. Press the thumbwheel or the components are free of dirt and reset stem to confirm the reset. debris. Do not clean the engine air cleaner/filter or components with Engine Air Cleaner/Filter water or compressed air. The engine air cleaner/filter is on the driver side of the engine 5.3L V8 Engine (L84) Shown, 2.7L compartment. See Engine L4 Engine (L3B), 4.3L V6 Engine Compartment Overview 0 332. (LV3), 5.3L V8 Engine (L82), and When to Inspect the Engine Air 6.2L V8 Engine (L87) Similar Cleaner/Filter 1. Air Duct Clamp If the vehicle is not equipped with 2. Electrical Harness the engine air filter life system see Connector 0 Maintenance Schedule 441 for 3. Screws intervals on inspecting and replacing the engine air cleaner 1. Locate the air cleaner/filter filter. assembly. See Engine Compartment Overview 0 332. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 345 2. Disconnect the outlet duct by 5. Inspect or replace the engine loosening the air duct air cleaner/filter. clamp (1). 6. Reverse Steps 2–4 to reinstall 3. Disconnect the electrical the filter cover housing. harness connector (2) from the 7. If equipped, reset the engine cover. air filter life system after 4. Remove the three screws on replacing the engine air filter. top of the cover of the housing, see Engine Air Filter Life then slide and lift the cover. System 0 343. 5. Lift and remove the engine air cleaner/filter. { Warning 6.6L V8 Engine (L8T) 6. Lightly tap and shake the Operating the engine with the air engine air cleaner/filter, away 1. Locate the air cleaner/filter cleaner/filter off can cause you or from the vehicle, to release assembly. See Engine others to be burned. Use caution 0 loose dust and dirt. Replace Compartment Overview 332. when working on the engine. Do the engine air filter if damaged. 2. Remove the eight screws on not start the engine or drive the 7. Reverse steps 2–5 to reinstall top of the cover of the housing, vehicle with the air cleaner/filter the engine air cleaner/filter then lift the cover. off, as flames may be present if cover housing. 3. Remove the engine air cleaner/ the engine backfires. 8. If equipped, reset the engine filter from the housing. Take air filter life system after care to dislodge as little dirt as replacing the engine air filter. possible. See Engine Air Filter Life 4. Clean the engine air cleaner/ System 0 343. filter sealing surfaces and the housing. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

346 Vehicle Care

Caution

If the air cleaner/filter is off, dirt can easily get into the engine, which could damage it. Always have the air cleaner/filter in place when driving.

Cooling System If the vehicle has the Duramax diesel engine, see the Duramax 2.7L L4 Engine (L3B) 5.3L V8 Engine (L84) Shown, 5.3L diesel supplement. V8 Engine (L82) and 6.2L The cooling system allows the V8 Engine (L87) Similar engine to maintain the correct working temperature. 1. Engine Electric Cooling Fans (Out of View) 2. Coolant Surge Tank and Pressure Cap

{ Warning

An underhood electric fan can start up even when the engine is not running and can cause injury. 4.3L V6 Engine (LV3) Keep hands, clothing, and tools away from any underhood electric fan. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 347

Warning (Continued) Warning (Continued)

cause an engine fire and can plain water or the wrong mixture, burn you. Fix any leak before the engine could get too hot but driving the vehicle. there would not be an overheat warning. The engine could catch Engine Coolant fire and you or others could be burned. The cooling system in the vehicle is filled with DEX-COOL engine coolant. This coolant is designed to Use a 50/50 mixture of clean, remain in the vehicle for 5 years or drinkable water and DEX-COOL 6.6L V8 Engine (L8T) 240 000 km (150,000 mi), whichever coolant. This mixture: occurs first. Gives freezing protection down 1. Engine Cooling Fan (Out . to −37 °C (−34 °F), outside of View) The following explains the cooling temperature. 2. Coolant Surge Tank and system and how to check and add Pressure Cap coolant when it is low. If there is a . Gives boiling protection up to problem with engine overheating, 129 °C (265 °F), engine 0 { Warning see Engine Overheating 351. temperature. What to Use . Protects against rust and Do not touch heater, radiator, a/c corrosion. pipes or hoses, or other engine parts. They can be very hot and { Warning . Will not damage aluminum parts. can burn you. Do not run the Plain water, or other liquids such . Helps keep the proper engine temperature. engine if there is a leak; all as alcohol, can boil before the coolant could leak out. That could proper coolant mixture will. With (Continued) (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

348 Vehicle Care The vehicle must be on a level Caution surface when checking the coolant level. Do not use anything other than a mix of DEX-COOL coolant that meets GM Standard GMW3420 and clean, drinkable water. Anything else can cause damage to the engine cooling system and the vehicle, which would not be covered by the vehicle warranty. 6.6L V8 (L8T) Engine Only Never dispose of engine coolant by Check to see if coolant is visible in putting it in the trash, or by pouring the coolant surge tank. If the coolant it on the ground, or into sewers, All Engines Except 6.6L V8 (L8T) inside the coolant surge tank is streams, or bodies of water. Have Engine boiling, wait until it cools down. The the coolant changed by an coolant level should be at or above authorized service center, familiar the indicated mark. If it is not, there with legal requirements regarding may be a leak in the cooling used coolant disposal. This will help system. protect the environment and your health. If coolant is visible but the coolant level is not at or above the indicated Checking Coolant mark, see the following sections on The coolant surge tank is in the how to add coolant to the coolant engine compartment on the driver surge tank following. side of the vehicle. See Engine Compartment Overview 0 332. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 349 Automatic Coolant Service Fill 6. Set the parking brake. How to Add Coolant to the Instructions (L3B Engine) 7. At the same time, press the Coolant Surge Tank for See 3.0L Duramax Diesel accelerator and the brake for Gasoline Engines Except L3B supplement for the diesel engine automatic transmission If the vehicle has a diesel engine, procedure. vehicles for two seconds, then see “Cooling System” in the release. If equipped, this feature assists in Duramax diesel supplement for the filling and removing air from the At the end of the cycle, check the proper coolant fill procedure. cooling system after service of coolant level in the surge tank and components or when coolant is add coolant if it is low. Turn off the { Warning added after being too low. vehicle, allow the Electronic Control Module (ECM) to go to sleep, about Spilling coolant on hot engine To activate the fill and air removal two minutes, and repeat Steps 3–7. parts can burn you. Coolant process: Listen for pump activation and contains and it will 1. With a cold system, add movement of the control valves burn if the engine parts are hot coolant to the indicated mark while watching the level of the enough. on the surge tank. coolant in the surge tank. If the tank 2. Replace the cap on the empties, turn the ignition off, surge tank. carefully remove the surge tank cap, { Warning refill to the indicated mark, and 3. Connect the vehicle to a repeat Steps 3 6. The fill and air battery charger. – Plain water, or other liquids such removal process will run for as alcohol, can boil before the 4. Set the ignition to Service or approximately 10 minutes. proper coolant mixture will. With Accessory Mode. See Ignition Positions (Keyless Access) plain water or the wrong mixture, 0 208 or the engine could get too hot but Ignition Positions (Key Access) there would not be an overheat 0 210. (Continued) 5. Turn off the air conditioning. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

350 Vehicle Care 3. Fill the coolant surge tank with Warning (Continued) Caution (Continued) the proper mixture to the full cold mark. warning. The engine could catch cause system damage. If coolant fire and you or others could be is not visible in the surge tank, 4. With the coolant surge tank burned. contact your dealer. pressure cap off, start the engine and let it run until the engine coolant temperature If no coolant is visible in the surge gauge indicates approximately { Warning tank, add coolant. 90 °C (195 °F). By this time, the coolant level Steam and scalding liquids from a inside the coolant surge tank hot cooling system are under may be lower. If the level is pressure. Turning the pressure lower, add more of the proper cap, even a little, can cause them mixture to the coolant surge to come out at high speed and tank until the level reaches the you could be burned. Never turn indicated mark. the cap when the cooling system, 1. Remove the coolant surge tank including the pressure cap, is hot. pressure cap when the cooling 5. Replace the pressure cap Wait for the cooling system and system, including the coolant tightly. surge tank pressure cap and pressure cap to cool. 6. Verify coolant level after the upper radiator hose, is no engine is shut off and the longer hot. coolant is cold. If necessary, Turn the pressure cap slowly repeat coolant fill procedure Caution counterclockwise about one full Steps 1–6. turn. If a hiss is heard, wait for Failure to follow the specific that to stop. A hiss means coolant fill procedure could cause there is still some pressure left. the engine to overheat and could 2. Keep turning the pressure cap (Continued) slowly, and remove it. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 351 There is a coolant temperature If the engine or transmission detects Caution gauge in the vehicle's instrument an impending hot fluid condition, cluster. See Engine Coolant then the transmission may force If the pressure cap is not tightly Temperature Gauge 0 133. upshifts to limit temperatures. installed, coolant loss and engine Downshifts may also be prevented damage may occur. Be sure the In addition, there are ENGINE OVERHEATED STOP ENGINE, in this instance. Normal operation cap is properly and tightly may continue unless the display secured. ENGINE OVERHEATED IDLE ENGINE, and ENGINE POWER IS indicates there is a hot condition REDUCED messages in the Driver and engine should be idled. Engine Overheating Information Center (DIC). If Steam is Coming from the If the vehicle has the Duramax If the decision is made not to lift the Engine Compartment diesel engine, see the Duramax hood when this warning appears, diesel supplement. get service help right away. See { Warning Roadside Assistance Program 0 Caution 466. Steam and scalding liquids from a If the decision is made to lift the hot cooling system are under Do not run the engine if there is a hood, make sure the vehicle is pressure. Turning the pressure leak in the engine cooling system. parked on a level surface. cap, even a little, can cause them This can cause a loss of all to come out at high speed and 2.7L L4, 4.3L V6, 5.3L V8, and 6.2L coolant and can damage the you could be burned. Never turn V8 Engines system and vehicle. Have any the cap when the cooling system, leaks fixed right away. Check to see if the engine cooling including the pressure cap, is hot. fans are running. If the engine is Wait for the cooling system and overheating, the fans should be pressure cap to cool. The vehicle has several indicators running. If they are not, do not to warn of engine overheating. continue to run the engine and have the vehicle serviced. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

352 Vehicle Care If No Steam is Coming from If the ENGINE OVERHEATED If there is still no sign of steam and the Engine Compartment STOP ENGINE or the ENGINE the vehicle is equipped with an OVERHEATED IDLE ENGINE engine driven cooling fan, push The ENGINE OVERHEATED STOP message appears with no sign of down the accelerator until the ENGINE or the ENGINE steam, try this for a minute or so: engine speed is about twice as fast OVERHEATED IDLE ENGINE 1. Turn the air conditioning off. as normal idle speed for at least message, along with a low coolant five minutes while the vehicle is condition, can indicate a serious 2. Turn the heater on to the parked. If the warning is still there, problem. highest temperature and to the turn off the engine and get everyone The 2.7L L4 engine will shut down highest fan speed. Open the out of the vehicle until it cools down. windows as necessary. automatically if the ENGINE If there is no sign of steam, idle the OVERHEATED STOP ENGINE 3. When it is safe to do so, pull off engine for five minutes while message displays. the road, shift to P (Park) or parked. If the warning is still If there is an engine overheat N (Neutral) and let the displayed, turn off the engine until it warning, but no steam is seen or engine idle. cools down. heard, the problem may not be too If the temperature overheat gauge is serious. Sometimes the engine can no longer in the overheat zone or an Overheated Engine get a little too hot when the vehicle: overheat warning no longer Protection . Climbs a long hill on a hot day. displays, the vehicle can be driven. Continue to drive the vehicle slowly Operating Mode . Stops after high-speed driving. for about 10 minutes. Keep a safe If an overheated engine condition . Idles for long periods in traffic. vehicle distance from the vehicle in exists and the ENGINE POWER IS front. If the warning does not come REDUCED message displays, an . Tows a trailer; see Trailer Towing back on, continue to drive normally overheat protection mode which 0 292. and have the cooling system alternates firing groups of cylinders checked for proper fill and function. helps to prevent engine damage. In If the warning continues, pull over, this mode, a loss in power and stop, and park the vehicle engine performance will be noticed. right away. This operating mode allows the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 353 vehicle to be driven to a safe place Engine Fan 6.6L V8 Engine (L8T) Only in an emergency. Driving extended The vehicle has a clutched engine distances and/or towing a trailer in If the vehicle has the Duramax cooling fan. When the is the overheat protection mode diesel engine, see the Duramax engaged, the fan spins faster to should be avoided. diesel supplement. provide more air to cool the engine. If the engine or transmission detects All Engines Except 6.6L In most everyday driving conditions, an impending hot fluid condition, V8 Engine (L8T) the fan is spinning slower and the then the transmission may force The vehicle has electric cooling clutch is not fully engaged. This upshifts to limit temperatures. fan(s). The fans may be heard improves fuel economy and reduces Downshifts may also be prevented spinning at low speed during most fan noise. Under heavy vehicle in this instance. Normal operation everyday driving. The fans may turn loading, trailer towing, and/or high may continue unless the display off if no cooling is required. Under outside temperatures, the fan speed indicates there is a hot condition heavy vehicle loading, trailer towing, increases as the clutch more fully and engine should be idled. high outside temperatures, engages, so an increase in fan or operation of the air conditioning noise may be heard. This is normal Caution system, the fans may change to and should not be mistaken as the high speed and an increase in fan transmission slipping or making After driving in the overheated noise may be heard. This is normal extra shifts. It is merely the cooling engine protection operating and indicates that the cooling system functioning properly. The fan mode, the engine oil will be system is functioning properly. The will slow down when additional severely degraded. Any repairs fans will change to low speed when cooling is not required and the performed before the engine is additional cooling is no longer clutch partially disengages. cool may cause engine damage. required. This fan noise may be heard when Allow the engine to cool before The electric engine cooling fans starting the engine. It will go away attempting any repair. Repair the may run after the engine has been as the fan clutch partially cause of coolant loss, change the turned off. This is normal and no disengages. oil, and reset the oil life system. service is required. See Engine Oil 0 339. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

354 Vehicle Care Power Steering Fluid How to Check Power Steering What to Use Fluid To check the power steering fluid: Caution 1. Set the ignition off and let the Use of the incorrect fluid may engine compartment damage the vehicle and the cool down. damages may not be covered by 2. Wipe the cap and the top of the the vehicle warranty. Always use The power steering fluid reservoir is reservoir clean. the correct fluid listed in in the engine compartment on the Recommended Fluids and 3. Unscrew the cap and wipe the 0 driver side of the vehicle. See dipstick with a clean rag. Lubricants 452. Engine Compartment Overview 0 332 for reservoir location. 4. Replace the cap and completely tighten it. To determine what kind of fluid to When to Check Power Steering use, see Recommended Fluids and 5. Remove the cap again and 0 Fluid Lubricants 452. Always use the look at the fluid level on the proper fluid. Failure to use the It is not necessary to regularly dipstick. proper fluid can cause leaks and check power steering fluid unless The level should be between the damage hoses and seals. there is a leak suspected in the ADD and FULL marks. If necessary, system or an unusual noise is add only enough fluid to bring the Washer Fluid heard. A fluid loss in this system level up to the hashed area between could indicate a problem. Have the the ADD and FULL marks. What to Use system inspected and repaired. To prevent contamination of brake When windshield washer fluid needs fluid, never check or fill the power to be added, be sure to read the steering reservoir with the brake manufacturer's instructions before master cylinder cover off. use. Use a fluid that has sufficient protection against freezing in an area where the temperature may fall below freezing. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 355 Adding Washer Fluid Caution Caution (Continued) The vehicle has a low washer fluid message on the DIC that comes on . Do not use washer fluid that for fluid expansion if when the washer fluid is low. The contains any type of water freezing occurs, which could message is displayed for repellent coating. This can damage the tank if it is 15 seconds at the start of each cause the wiper blades to completely full. ignition cycle. When the WASHER chatter or skip. FLUID LOW ADD FLUID message . Do not use engine coolant displays, washer fluid will need to Brakes () in the be added to the windshield washer windshield washer. It can pads have built-in wear fluid reservoir. damage the windshield indicators that make a high-pitched washer system and paint. warning sound when the brake pads are worn and new pads are needed. . Do not mix water with The sound can come and go or be ready-to-use washer fluid. heard all the time the vehicle is Water can cause the moving, except when applying the solution to freeze and brake pedal firmly. damage the washer fluid tank and other parts of the Open the cap with the washer washer system. { Warning symbol on it. Add washer fluid until the tank is full. See Engine . When using concentrated The brake wear warning sound Compartment Overview 0 332 for washer fluid, follow the means that soon the brakes will reservoir location. manufacturer instructions for not work well. That could lead to adding water. a crash. When the brake wear . Fill the washer fluid tank warning sound is heard, have the only three-quarters full when vehicle serviced. it is very cold. This allows (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

356 Vehicle Care Replacing Brake System Parts Brake pads should always be Caution replaced as complete axle sets. Always replace brake system parts Continuing to drive with worn-out with new, approved replacement How to Reset the Brake Pad brake pads could result in costly parts. If this is not done, the brakes Life System brake repair. may not work properly. The braking performance expected can change The system will automatically detect in many other ways if the wrong when significantly worn brake pads Some driving conditions or climates replacement brake parts are are replaced. When the ignition is can cause a brake squeal when the installed or parts are improperly turned on after new pads and wear brakes are first applied or lightly installed. sensors are installed, a message applied. This does not mean will display. Follow the prompts to something is wrong with the brakes. Brake Pad Life System reset the system. Properly torqued wheel nuts are The brake pad life system can also necessary to help prevent brake When to Change Brake Pads be manually reset: pulsation. When tires are rotated, This vehicle has a system that 1. Display Brake Pad Life on the inspect brake pads for wear and estimates the remaining life of the DIC. See Driver Information evenly tighten wheel nuts in the front and rear brake pads. Brake Center (DIC) (Base Level) proper sequence to torque pad life is displayed in the Driver 0 147 or specifications in Capacities and Information Center (DIC), along with 0 Driver Information Center (DIC) Specifications 458. a percentage for each axle. The (Midlevel and Uplevel) 0 148. Brake linings should always be system must be reset every time the brake pads are changed. 2. Press the thumbwheel or the replaced as complete axle sets. trip odometer reset stem if the Brake Pedal Travel When the system has determined vehicle does not have DIC that the brake pads need to be buttons. Select front or rear See your dealer if the brake pedal replaced, a message will display, pads as appropriate. does not return to normal height, which may include mileage or if there is a rapid increase in remaining. 3. Select YES on the confirmation pedal travel. This could be a sign message, or press the trip that brake service may be required. odometer reset stem on a base GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 357 level DIC. Repeat for pads on To turn the brake pad life system There are only two reasons why the the other axle if they were also back on, follow the above steps but brake fluid level in the reservoir may replaced. select ENABLE in Step 2. go down: . Normal brake lining wear. When How to Disable the Brake Pad Brake Fluid Life System new linings are installed, the fluid level goes back up. The brake pad life system can be turned off. This may be necessary if . A fluid leak in the brake aftermarket brake pads without wear hydraulic system. Have the sensors are installed. When the brake hydraulic system fixed. system is turned off, the front and With a leak, the brakes will not rear brake pad life percentages will work well. not display. However, the built-in The brake master cylinder reservoir Always clean the brake fluid wear indicators that make a is filled with GM approved DOT 4 reservoir cap and the area around high-pitched warning sound when (1500) or DOT 3 (2500/3500) brake the cap before removing it. the brake pads are worn can still fluid as indicated on the reservoir Do not top off the brake fluid. determine when the pads should be cap. See Engine Compartment Adding fluid does not correct a leak. replaced. See Brakes 0 355. Overview 0 332 for the location of If fluid is added when the linings are To turn off the brake pad life system: the reservoir. worn, there will be too much fluid 1. Display Brake Pad Life on the Checking Brake Fluid when new brake linings are DIC. See Driver Information installed. Add or remove fluid, as With the vehicle in P (Park) on a Center (DIC) (Base Level) necessary, only when work is done level surface, the brake fluid level 0 147 or on the brake hydraulic system. should be between the minimum Driver Information Center (DIC) and maximum marks on the brake (Midlevel and Uplevel) 0 148. fluid reservoir. 2. Select DISABLE. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

358 Vehicle Care sealed container. See Refer to the replacement number { Warning Recommended Fluids and shown on the original battery label Lubricants 0 452. when a new battery is needed. See If too much brake fluid is added, it Engine Compartment Overview can spill on the engine and burn, 0 332 for battery location. if the engine is hot enough. You { Warning Stop/Start System or others could be burned, and The wrong or contaminated brake the vehicle could be damaged. fluid could result in damage to the Vehicles equipped with a 2.7L L3B, Add brake fluid only when work is brake system. This could result in 3.0L LM2, 5.3L L84 or 6.2L L87 are done on the brake hydraulic the loss of braking leading to a equipped with a Stop/Start system system. possible injury. Always use the to shut off the engine to help proper GM approved brake fluid. conserve fuel. See Stop/Start System 0 213. When the brake fluid falls to a low level, the brake warning light comes Vehicles with the Stop/Start system on. See Brake System Warning have an Absorbed Glass Mat (AGM) Light 0 139. Caution 12-volt battery. Installation of a standard 12-volt battery will result in Brake fluid absorbs water over time If brake fluid is spilled on the reduced 12-volt battery life. When which degrades the effectiveness of vehicle's painted surfaces, the using a 12-volt battery charger on the brake fluid. Replace brake fluid paint finish can be damaged. the 12-volt AGM battery, some at the specified intervals to prevent Immediately wash off any painted chargers have an AGM battery increased stopping distance. See surface. setting on the charger. If available, Maintenance Schedule 0 441. use the AGM setting on the charger What to Add Battery - North America to limit charge voltage to 14.8 volts. Follow the charger manufacturer s Use only GM approved DOT 3 or ’ The original equipment battery is instructions. DOT 4 brake fluid, as indicated on maintenance free. Do not remove the reservoir cap, from a clean, the cap and do not add fluid. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 359 Vehicle Storage Negative Battery Cable { Warning Disconnection WARNING: Battery posts, { Warning terminals, and related { Warning Batteries have acid that can burn accessories contain lead and lead you and gas that can explode. Before disconnecting the negative compounds, chemicals known to You can be badly hurt if you are battery cable, turn off all features, the State of California to cause not careful. See Jump Starting - turn the ignition off, and remove cancer and birth defects or other North America 0 419 for tips on the key, if equipped, from the reproductive harm. Batteries also working around a battery without vehicle. If this is not done, you or contain other chemicals known to getting hurt. others could be injured, and the the State of California to cause vehicle could be damaged. cancer. WASH HANDS AFTER HANDLING. For more information Infrequent Usage: Remove the go to www.P65Warnings.ca.gov/ black, negative (−) cable from the passenger-vehicle. battery to keep the battery from Caution running down. If the battery is disconnected with See California Proposition Extended Storage: Remove the the ignition on or the vehicle in 65 Warning 0 329 and the back black, negative (−) cable from the cover. battery or use a battery trickle Retained Accessory Power charger. (RAP), the OnStar back-up battery will be permanently discharged and will need to be replaced.

1. Make sure the lamps, features, and accessories are turned off. 2. Turn the ignition off and remove the key, if equipped. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

360 Vehicle Care For vehicles equipped with the Stop/ For vehicles not equipped with the Negative Battery Cable Start system: Stop/Start system: Reconnection

Caution

When reconnecting the battery: . Use the original nut from the vehicle to secure the negative battery cable. Do not use a different nut. If you need a replacement nut, see your dealer. . Tighten the nut with a hand tool. Do not use an impact 1. Loosen and remove the 1. Loosen the negative battery wrench or power tools to negative battery cable nut (1) cable nut (1). tighten the nut. at the battery sensor 2. Remove the negative battery The vehicle could be damaged if connection. cable clamp (2) from the these guidelines are not followed. 2. Remove the negative battery negative battery post. cable (2) from the battery 3. Cover the negative battery sensor stud. cable clamp, and negative Caution 3. Cover the negative battery battery post with a cable terminal, battery sensor non-conductive material to Do not use paints, lubricants, stud, and negative battery post prevent any contact with the or corrosion inhibitors on the nut with a non-conductive material negative battery cable. that secures the negative battery to prevent any contact with the cable to the vehicle. This could negative battery cable. damage the vehicle. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 361 For vehicles equipped with the Stop/ When to Change Lubricant Start system: Refer to Maintenance Schedule 1. Install the negative battery 0 441 to determine how often to cable to the battery change the lubricant. sensor stud. What to Use 2. Install the negative battery Refer to Recommended Fluids and cable nut to the battery sensor 0 stud and tighten. Lubricants 452 to determine what kind of lubricant to use. 3. Turn the ignition on. For vehicles not equipped with the Front Axle Stop/Start system: When to Check Lubricant 1. Install the negative battery 1. Fill Plug It is not necessary to regularly cable clamp to the negative 2. Drain Plug check the front axle fluid unless a battery post. To get an accurate reading, the leak is suspected or an unusual 2. Tighten the negative battery vehicle should be on a level noise is heard. A fluid loss could cable nut. surface. indicate a problem. Have it 3. Turn the ignition on. If the level is below the bottom of inspected and repaired. This service the fill plug (1) hole, located on the can be complex. See your dealer. Four-Wheel Drive transfer case, some lubricant will Do not directly power wash the need to be added. Add enough transfer case and/or front/rear axle Transfer Case lubricant to raise the level to the output seals. High pressure water bottom of the fill plug (1) hole. Use When to Check Lubricant can overcome the seals and care not to overtighten the plug. contaminate the fluid. Contaminated Refer to Maintenance Schedule fluid will decrease the life of the 0 441 to determine when to check transfer case and/or drive axles and the lubricant. should be replaced. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

362 Vehicle Care Rear Axle LLC, was designed, built and maintenance, repair, equipped to conform at the time it or replacement, of any device When to Check Lubricant left General Motors LLC’s control or element of design It is not necessary to regularly with all applicable U.S. EPA Noise incorporated into any new check the rear axle fluid unless a Control Regulations. This warranty vehicle for the purpose of noise leak is suspected or an unusual covers this vehicle as designed, control prior to its sale or noise is heard. A fluid loss could built and equipped by General delivery to the ultimate indicate a problem. Have it Motors LLC, and is not limited to purchaser or while it is in inspected and repaired. This service any particular part, component or use; or can be complex. See your dealer. system of the vehicle manufactured 2. the use of the vehicle after by General Motors LLC. Defects in Do not directly power wash the such device or element of design, assembly or in any part, design has been removed or transfer case and/or front/rear axle component or system of the vehicle output seals. High pressure water rendered inoperative by any as manufactured by General Motors person. can overcome the seals and LLC, which, at the time it left contaminate the fluid. Contaminated General Motors LLC’s control, Among those acts presumed to fluid will decrease the life of the caused noise emissions to exceed constitute tampering are the acts transfer case and/or drive axles and Federal standards, are covered by listed below. should be replaced. this warranty for the life of the Insulation: vehicle. Noise Control System Removal of the noise shields or any TAMPERING WITH NOISE undercab insulation. NOISE EMISSIONS CONTROL SYSTEM WARRANTY PROHIBITED Engine: Removal or rendering engine speed General Motors LLC, warrants to the Federal law prohibits the following governor, if so equipped, inoperative first person who purchases this acts or the causing thereof: vehicle for purposes other than so as to allow engine speed to resale and to each subsequent 1. The removal or rendering exceed manufacturer specifications. inoperative by any person, purchaser that this vehicle as Modification of the engine control other than for purposes of manufactured by General Motors system or calibration. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 363 Fan and Drive: 1. Before starting this check, be 1. Before starting this check, be . Removal of fan clutch or sure there is enough room sure there is enough room rendering clutch inoperative. around the vehicle. around the vehicle. It should be parked on a level surface. . Removal of the fan shroud. 2. Apply both the parking brake and the regular brake. 2. Apply the parking brake. Be Air Intake: Do not use the accelerator ready to apply the regular . Removal of air cleaner silencer. pedal, and be ready to turn off brake immediately if the vehicle begins to move. . Reversing air cleaner cover. the engine immediately if it starts. 3. With the engine off, turn the Exhaust: 3. Try to start the engine in each ignition on, but do not start the . Removal of muffler, catalytic gear. The vehicle should start engine. Without applying the converter, and/or resonator. only in P (Park) or N (Neutral). regular brake, try to move the If the vehicle starts in any other shift lever out of P (Park) with . Removal of exhaust pipes and normal effort. If the shift lever exhaust pipe clamps. position, contact your dealer for service. moves out of P (Park), contact your dealer for service. Starter Switch Check Automatic Transmission Ignition Transmission { Warning Shift Lock Control Lock Check Function Check When you are doing this If equipped with Key Access ignition, while parked, and with the inspection, the vehicle could { Warning move suddenly. If the vehicle parking brake set, try to turn the moves, you or others could be When you are doing this ignition off in each shift lever position. The ignition should turn to injured. inspection, the vehicle could off only when the shift lever is in move suddenly. If the vehicle P (Park). moves, you or others could be injured. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

364 Vehicle Care The ignition key should come out pressure from the regular brake only when the ignition is off. Contact pedal. Do this until the vehicle is Caution your dealer if service is required. held by the parking brake only. Allowing the wiper arm to touch . To check the P (Park) Park Brake and P (Park) the windshield when no wiper mechanism's holding ability: blade is installed could damage Mechanism Check With the engine running, shift to the windshield. Any damage that P (Park). Then release the occurs would not be covered by { Warning parking brake followed by the the vehicle warranty. Do not allow regular brake. the wiper arm to touch the When you are doing this check, Contact your dealer if service is windshield. the vehicle could begin to move. required. You or others could be injured and property could be damaged. Wiper Blade Replacement Front Wiper Blade Make sure there is room in front Replacement Windshield wiper blades should be of the vehicle in case it begins to To replace the wiper blade: roll. Be ready to apply the regular replaced periodically. See Maintenance Schedule 0 441. 1. Pull the wiper assembly away brake at once should the vehicle from the windshield. begin to move. Replacement blades come in different types and are removed in different ways. For proper type and Park on a fairly steep hill, with the length, see Maintenance vehicle facing downhill. Keeping Replacement Parts 0 454. your foot on the regular brake, set the parking brake. . To check the parking brake's holding ability: With the engine running and the transmission in N (Neutral), slowly remove foot GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 365 Windshield Replacement Gas Strut(s) HUD System This vehicle is equipped with gas strut(s) to provide assistance in The windshield is part of the HUD lifting and holding open the hood/ system. If the windshield must be trunk/liftgate system in full open replaced, get one that is designed position. for HUD or the HUD image may look out of focus. { Warning Driver Assistance Systems If the gas struts that hold open If the windshield needs to be the hood, trunk, and/or liftgate fail, replaced and the vehicle is you or others could be seriously equipped with a front camera sensor 2. Lift up on the latch in the injured. Take the vehicle to your for the Driver Assistance Systems, a middle of the wiper blade dealer for service immediately. where the wiper arm attaches. GM replacement windshield is recommended. The replacement Visually inspect the gas struts for 3. With the latch open, pull the windshield must be installed signs of wear, cracks, or other wiper blade down toward the according to GM specifications for damage periodically. Check to windshield far enough to proper alignment. If it is not, these make sure the hood/trunk/liftgate release it from the J-hooked systems may not work properly, they is held open with enough force. end of the wiper arm. may display messages, or they may If struts are failing to hold the 4. Remove the wiper blade. not work at all. See your dealer for hood/trunk/liftgate, do not proper windshield replacement. operate. Have the vehicle 5. Reverse Steps 1–3 for wiper blade replacement. serviced. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

366 Vehicle Care

Caution Headlamp Aiming Do not apply tape or hang any Front Headlamp Aiming objects from gas struts. Also do Headlamp aim has been preset and not push down or pull on gas should need no further adjustment. struts. This may cause damage to the vehicle. If the vehicle is damaged in a crash, the headlamp aim may be affected. If adjustment to the headlamps is 0 See Maintenance Schedule 441. necessary, see your dealer.

Trunk

Hood

Liftgate GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 367 Bulb Replacement LED Lighting Headlamp Replacement For the proper type of replacement This vehicle has several LED lamps. See your dealer for headlamp bulbs, or any bulb changing For replacement of any LED lighting replacement. procedure not listed in this section, assembly, contact your dealer. Turn Signal Lamp contact your dealer. Headlamps, Front Turn Replacement Caution Signal, Sidemarker, and Base Level Parking Lamps 1. Open the hood. Do not replace incandescent bulbs with aftermarket LED Base Level Headlamp 2. Turn the bulb socket replacement bulbs. This can counterclockwise to remove it Assembly from the headlamp assembly cause damage to the vehicle and pull it straight out. electrical system. 3. Remove the bulb by pulling it straight out of the bulb socket. Halogen Bulbs 4. Replace the bulb and reverse Steps 1–3 to reinstall. { Warning Uplevel Halogen bulbs have pressurized See your dealer for headlamp gas inside and can burst if you replacement. drop or scratch the bulb. You or others could be injured. Be sure to read and follow the instructions on the bulb package. 1. Turn Signal Lamps GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

368 Vehicle Care Taillamps, Turn Signal, To replace one of these bulbs: Stoplamps, and Back-Up 1. Open the tailgate. Lamps Base Level Taillamp Assembly

4. Pull the rear lamp assembly outward and rearward away from the box side to remove it from the vehicle. 2. Remove the two rear lamp assembly screws. 5. Turn the bulb socket counterclockwise. 1. Stoplamp/Turn Signal Lamp 6. Pull the bulb straight out from 2. Back-Up Lamp the socket. Uplevel Taillamp Assembly 7. Replace the bulb and reverse Steps 1–5 to reinstall. See your dealer for taillamp replacement. It is recommended to replace the grommets when replacing a bulb. See your dealer. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 369 Center High-Mounted To replace one of these bulbs: License Plate Lamp Stoplamp (CHMSL) and To replace the bulb: Cargo Lamp 1. Reach behind the rear bumper This procedure is for the regular cab and locate the bulb. only. For crew cab and double cab 2. Turn the bulb socket see your dealer. counterclockwise and pull the bulb straight out of the socket.

1. Remove the two screws and lift off the lamp assembly. 2. Turn the bulb socket counterclockwise and pull it straight out. 3. Pull the bulb straight out from 1. Cargo Lamp Bulbs the socket. 2. Center High-Mounted 3. Replace the bulb and reverse Stoplamp (CHMSL) Bulb Step 2 to reinstall. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

370 Vehicle Care Windshield Wipers Electrical System { Danger If the wiper motor overheats due to Electrical System heavy snow or ice, the windshield Fuses and circuit breakers are Overload wipers will stop until the motor cools marked with their ampere rating. and will then restart. Do not exceed the The vehicle has fuses to protect Although the circuit is protected specified amperage rating when against an electrical system from electrical overload, overload replacing fuses and circuit overload. Fuses also protect power due to heavy snow or ice may breakers. Use of an oversized devices in the vehicle. cause wiper linkage damage. fuse or circuit breaker can result Replace a bad fuse with a new one Always clear ice and heavy snow in a vehicle fire. You and others of the identical size and rating. from the windshield before using the could be seriously injured or If there is a problem on the road and windshield wipers. killed. a fuse needs to be replaced, there If the overload is caused by an are some spare fuses and a fuse electrical problem and not snow or To check a fuse, look at the puller in the left instrument panel ice, be sure to get it fixed. silver-colored band inside the fuse. fuse block. The same amperage If the band is broken or melted, fuse can also be borrowed. Choose Fuses and Circuit replace the fuse. Be sure to replace some feature of the vehicle that is Breakers a bad fuse with a new one of the not needed to use and replace it as identical size and rating. soon as possible. The wiring circuits in the vehicle are protected from short circuits by a Fuses of the same amperage can Headlamp Wiring combination of fuses and circuit be temporarily borrowed from An electrical overload may cause breakers. This greatly reduces the another fuse location, if a fuse goes the lamps to go on and off, or in chance of damage caused by out. Replace the fuse as soon as some cases to remain off. Have the electrical problems. possible. headlamp wiring checked right away if the lamps go on and off or remain off. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 371 Engine Compartment Caution Fuse Block If the vehicle has a diesel engine, Spilling liquid on any electrical see the Duramax diesel component on the vehicle may supplement. damage it. Always keep the covers on any electrical The engine compartment fuse block component. is in the engine compartment, on the passenger side of the vehicle for 1500 and driver side of vehicle for A fuse puller is available in the left 2500/3500. instrument panel end cap. The vehicle may not be equipped with all of the fuses, relays, and features shown.

Lift the cover to access the fuse block. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

372 Vehicle Care

Fuses Usage 4 Headlamp right 6 TIM 7 – 8 Fog lamp 9 VKM 10 – 11 Police upfitter 12 – 13 Washer front 14 Washer rear 15 MSB driver 16 – 17 IECL 1 19 DC/AC inverter 20 IECR 2 (LD) / EBCM2 (HD) 21 MSB pass 22 IECL 2 Fuses Usage 24 EBCM 1 Fuses Usage 2 High-beam right 25 REC 1 High-beam left 3 Headlamp left GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 373

Fuses Usage Fuses Usage Fuses Usage 26 – 47 Transmission 61 VES 27 Horn control module 62 Integrated chassis ignition control 28 – 48 – module/CVS 29 – 49 Transmission 63 Trailer battery 30 – control module 65 Auxiliary 31 – 50 A/C clutch underhood 32 Rear window 51 Transfer case electrical center defogger control module 66 Cooling fan 33 Heated mirror 52 Front wiper motor left 34 Parking lamp left 53 Center 67 Active fuel management 2 37 Euro trailer high-mounted stop lamp 68 – 38 TIM 54 Trailer 69 Starter Pinion (LD) 39 – reverse lamp / Starter Motor 40 Misc ignition 55 Trailer (HD Gas) 41 Trailer back-up lamp 71 Cooling fan parking lamp 56 SADS 72 Cooling fan right 42 Park lamp right 57 TTPM 73 Trailer stop/turn 44 – 58 Starter motor (LD & lamp left 45 Second fuel pump HD DSL) 74 TIM 46 Engine control 60 Active fuel 75 DEFC module ignition management 1 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

374 Vehicle Care

Fuses Usage Relays Usage Instrument Panel Fuse 76 Electric RNG BDS 5 Headlamp Block (Left) 78 Engine control 18 DC/AC inverter module 23 Rear window 79 Auxiliary battery defogger 80 Cabin 35 Parking lamp cooling pump 36 Run/Crank 81 Trailer stop/turn 43 Second fuel pump lamp right 59 A/C clutch 82 TIM 64 Starter Motor (LD & 83 FTZM HD DSL) / Cool 84 Trailer brake Fan Clutch (HD Gas) 85 ENG The left instrument panel fuse block 86 Engine control 70 Starter Pinion (LD) access door is on the driver side module / Starter Motor edge of the instrument panel. (HD Gas) 87 Injector B even The vehicle may not be equipped 77 Powertrain with all of the fuses, relays, and 88 O2 B sensor features shown. 89 O2 A sensor Pull off the cover to access the fuse 90 Injector A odd block. A fuse puller is available in the left instrument panel end cap. 91 Engine control module throttle control 92 Cool fan clutch GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 375

Fuses Usage Fuses Usage F1 Rear heated seats F17 MFEG left/right F18 – F3 Euro trailer F20 Endgate F4 – F22 Rear sliding window F5 Front Bolster F23 – F6 Heated and ventilated F24 – seats left/right F25 – F8 Rear seat entertainment/Theft F26 – deterrent F27 – F9 Passive entry/Passive start/Driver seat Circuit Usage module Breakers F10 – CB1 – F11 Sunshade F12 Passenger power seat Relays Usage F13 Export power take off/ K1 Rear sliding Special equipment window open option 1 K2 Rear sliding window The vehicle may not be equipped close F14 – with all of the fuses, relays, and K3 MFEG major 1 features shown. F15 – F16 AMP K4 MFEG minor 1 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

376 Vehicle Care

Relays Usage Pull off the cover to access the front To access the back of the fuse of the fuse block. block: K5 MFEG minor 2 K6 MFEG major 2 K7 Anti-theft K8 – Instrument Panel Fuse Block (Right)

1. Push the tab at the top of fuse block down. 2. Pull the top of the fuse block outward. 3. Reverse Steps 1–2 to reinstall.

The right instrument panel fuse block access door is on the passenger side edge of the instrument panel. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 377

The vehicle may not be equipped Fuses Usage with all of the fuses, relays, and features shown. F19 DLIS Fuses Usage F20 Ventilated seats F1 Right doors F21 NOT R/C F2 Left doors F22 Heated steering wheel F3 Universal remote F23 MISC R/C system F24 Instrument panel F4 – cluster ignition/ Overhead F5 – F25 Heating, ventilation, F6 Front blower and air conditioning F8 Lumbar switch ignition/Heating, F10 Body control ventilation, and air module 6/Body control conditioning auxiliary module 7 F26 USB ports/Special F11 Seat/CLM equipment option retained accessory F12 Body control power module 3/Body control module 5 F27 Accessory power outlet/retained Back F14 Mirrors/Windows accessory power module F28 Accessory power F17 Steering wheel outlet/Battery controls F18 VPM/OBS DET GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

378 Vehicle Care

Fuses Usage Fuses Usage Relays Usage F30 Sensing and F49 Body control module 1 K1 Run/Crank diagnostic module/ F50 – K2 Retained accessory Parking brake F51 Battery 1 power/Accessory 1 F31 Body control module 4 F52 Battery 2 K4 Retained accessory F32 Special equipment power/Accessory 2 option/Data link F53 – K5 – connection F54 Sunroof F33 Body control module 8 F55 Driver power seat F34 Cargo lamp F56 DC DC TRANS 1 F40 CGM F57 DC DC TRANS 2 F41 Infotainment 1 F58 Infotainment 2 F42 TCP F43 – Circuit Usage Breakers F44 AVM 1 Accessory power F45 Body control module 2 outlet 2 F46 Heating, ventilation, 2 Accessory power and air conditioning/ outlet 1/Cigarette Battery 1 Lighter F47 Instrument panel 3 Accessory power cluster/Battery outlet 3 F48 Transmission control 4 Accessory power module outlet 4 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 379

Wheels and Tires Warning (Continued) Warning (Continued) Tires . Underinflated tires pose . Replace any tires that Every new GM vehicle has the same danger as have been damaged by high-quality tires made by a overloaded tires. The impacts with potholes, leading tire manufacturer. See resulting crash could curbs, etc. the warranty manual for cause serious injury. . Improperly repaired tires information regarding the tire Check all tires frequently can cause a crash. Only warranty and where to get to maintain the the dealer or an service. For additional recommended pressure. authorized tire service information refer to the tire Tire pressure should be center should repair, manufacturer. checked when the tires replace, dismount, and are cold. mount the tires. { Warning . Overinflated tires are . Do not spin the tires in more likely to be cut, . Poorly maintained and excess of 56 km/h punctured, or broken by (35 mph) on slippery improperly used tires are a sudden impact — such dangerous. surfaces such as snow, as when hitting a pothole. mud, ice, etc. Excessive . Overloading the tires can Keep tires at the spinning may cause the cause overheating as a recommended pressure. tires to explode. result of too much . Worn or old tires can flexing. There could be a cause a crash. If the All-Season Tires blowout and a serious tread is badly worn, crash. See Vehicle Load replace them. This vehicle may come with 0 all-season tires. These tires are Limits 200. (Continued) (Continued) designed to provide good overall GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

380 Vehicle Care performance on most road surfaces roads is expected. See your dealer Low-Profile Tires and weather conditions. Original for details regarding winter tire equipment tires designed to GM's availability and proper tire selection. If the vehicle has 275/60R20 or specific tire performance criteria Also, see Buying New Tires 0 399. 275/50R22 size tires, they are have a TPC specification code With winter tires, there may be classified as low-profile tires. molded onto the sidewall. Original decreased dry road traction, equipment all-season tires can be increased road noise, and shorter Caution identified by the last two characters tread life. After changing to winter of this TPC code, which will tires, be alert for changes in vehicle Low-profile tires are more be “MS.” handling and braking. susceptible to damage from road hazards or curb impact than Consider installing winter tires on If using winter tires: the vehicle if frequent driving on standard profile tires. Tire and/or snow or ice-covered roads is . Use tires of the same brand and wheel assembly damage can expected. All-season tires provide tread type on all four wheel occur when coming into contact adequate performance for most positions. with road hazards like potholes, winter driving conditions, but they . Use only radial ply tires of the or sharp edged objects, or when may not offer the same level of same size, load range, and sliding into a curb. The warranty traction or performance as winter speed rating as the original does not cover this type of tires on snow or ice-covered roads. equipment tires. damage. Keep tires set to the See Winter Tires 0 380. correct inflation pressure and Winter tires with the same speed when possible, avoid contact with Winter Tires rating as the original equipment tires may not be available for H, V, W, Y, curbs, potholes, and other road This vehicle was not originally and ZR speed rated tires. If winter hazards. equipped with winter tires. Winter tires with a lower speed rating are tires are designed for increased chosen, never exceed the tire's traction on snow and ice-covered maximum speed capability. roads. Consider installing winter tires on the vehicle if frequent driving on ice or snow covered GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 381 All-Terrain Tires code molded onto the sidewall. GM's TPC specifications meet or This vehicle may have all-terrain tires. These tires provide good exceed all federal safety performance on most road surfaces, guidelines. weather conditions, and for off-road (3) DOT (Department of 0 driving. See Off-Road Driving 191. Transportation) : The The tread pattern on these tires may Department of Transportation wear more unevenly than other (DOT) code indicates that the tires. Consider rotating the tires tire is in compliance with the more frequently than at 12 000 km U.S. Department of (7,500 mi) intervals if irregular wear Transportation Motor Vehicle is noted when the tires are Passenger (P-Metric)/Spare Tire Safety Standards. inspected. See Tire Inspection 0 396. (1) Tire Size : The tire size code DOT Tire Date of is a combination of letters and Manufacture : The last four Tire Sidewall Labeling numbers used to define a digits of the TIN indicate the tire particular tire's width, height, Useful information about a tire is manufactured date. The first two aspect ratio, construction type, digits represent the week molded into the sidewall. The and service description. See the examples show a typical (01-52) and the last two digits, “Tire Size” illustration later in this the year. For example, the third passenger and light truck tire section. sidewall. week of the year 2010 would (2) TPC Spec (Tire have a four-digit DOT date Performance Criteria of 0310. Specification) : Original (4) Tire Identification Number equipment tires designed to (TIN) : The letters and numbers GM's specific tire performance following the DOT code are the criteria have a TPC specification Tire Identification Number (TIN). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

382 Vehicle Care The TIN shows the (7) Maximum Cold Inflation manufacturer and plant code, Load Limit : Maximum load that tire size, and date the tire was can be carried and the manufactured. The TIN is maximum pressure needed to molded onto both sides of the support that load. For tire, although only one side may information on recommended have the date of manufacture. tire pressure see Tire Pressure 0 387 and (5) Tire Ply Material : The type 0 of cord and number of plies in Vehicle Load Limits 200. the sidewall and under the tread. (8) Temporary Use Only : Only use a temporary spare tire until (6) Uniform Tire Quality Light Truck (LT-Metric) Tire Grading (UTQG) : Tire the road tire is repaired and manufacturers are required to replaced. This spare tire should (1) Tire Size : The tire size code grade tires based on three not be driven on over 112 km/h is a combination of letters and performance factors: treadwear, (70 mph), or 88 km/h (55 mph) numbers used to define a traction, and temperature when pulling a trailer, with the particular tire's width, height, proper inflation pressure. See aspect ratio, construction type, resistance. For more 0 information, see Uniform Tire Full-Size Spare Tire 418. and service description. See the Quality Grading 0 402. “Tire Size” illustration later in this section for more detail. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 383 (2) TPC Spec (Tire U.S. Department of (6) Tire Ply Material : The type Performance Criteria Transportation Motor Vehicle of cord and number of plies in Specification) : Original Safety Standards. the sidewall and under the tread. equipment tires designed to DOT Tire Date of (7) Single Tire Maximum GM's specific tire performance Manufacture : The last four Load : Maximum load that can criteria have a TPC specification digits of the TIN indicate the tire be carried and the maximum code molded onto the sidewall. manufactured date. The first two pressure needed to support that GM's TPC specifications meet or digits represent the week load when used as a single. For exceed all federal safety (01-52) and the last two digits, information on recommended guidelines. the year. For example, the third tire pressure see Tire Pressure (3) Dual Tire Maximum Load : week of the year 2010 would 0 387 and Maximum load that can be have a four-digit DOT date Vehicle Load Limits 0 200. carried and the maximum of 0310. pressure needed to support that (5) Tire Identification Number Tire Designations load when used in a dual (TIN) : The letters and numbers Tire Size configuration. For information on following the DOT code are the The examples show a typical recommended tire pressure see Tire Identification Number (TIN). 0 passenger vehicle and light Tire Pressure 387 and The TIN shows the 0 truck tire size. Vehicle Load Limits 200. manufacturer and plant code, (4) DOT (Department of tire size, and date the tire was Transportation) : The manufactured. The TIN is Department of Transportation molded onto both sides of the (DOT) code indicates that the tire, although only one side may tire is in compliance with the have the date of manufacture. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

384 Vehicle Care would mean that the tire's sidewall is 75 percent as high as it is wide. (4) Construction Code : A letter code is used to indicate the type Passenger (P-Metric) Tire of ply construction in the tire. Light Truck (LT-Metric) Tire The letter R means radial ply (1) Passenger (P-Metric) Tire : construction; the letter D means (1) Light Truck (LT-Metric) The United States version of a diagonal or bias ply Tire : The United States version metric tire sizing system. The construction. of a metric tire sizing system. letter P as the first character in The letters LT as the first two the tire size means a passenger (5) Diameter : Diameter of characters in the tire size mean vehicle tire engineered to the wheel in inches. a light truck tire engineered to standards set by the U.S. Tire (6) Service Description : These standards set by the U.S. Tire and Rim Association. characters represent the load and Rim Association. (2) Tire Width : The three-digit index and speed rating of the (2) Tire Width : The three-digit number indicates the tire section tire. The load index represents number indicates the tire section width in millimeters from the load carrying capacity a tire width in millimeters from sidewall to sidewall. is certified to carry. The speed sidewall to sidewall. rating is the maximum speed a (3) Aspect Ratio : A two-digit tire is certified to carry a load. (3) Aspect Ratio : A two-digit number that indicates the tire number that indicates the tire height-to-width measurements. height-to-width measurements. For example, if the tire size For example, if the tire size aspect ratio is 75, as shown in aspect ratio is 75, as shown in item C of the tire illustration, it item 3 of the light truck (LT-Metric) tire illustration, it GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 385 would mean that the tire's Tire Terminology and Bead : The tire bead contains sidewall is 75 percent as high as Definitions steel wires wrapped by steel it is wide. cords that hold the tire onto Air Pressure : The amount of the rim. (4) Construction Code : A letter air inside the tire pressing code is used to indicate the type outward on each square inch of Bias Ply Tire : A pneumatic tire of ply construction in the tire. the tire. Air pressure is in which the plies are laid at The letter R means radial ply expressed in kPa (kilopascal) alternate angles less than construction; the letter D means or psi (pounds per square inch). 90 degrees to the centerline of diagonal or bias ply the tread. construction. Accessory Weight : The combined weight of optional Cold Tire Pressure : The (5) Rim Diameter : Diameter of accessories. Some examples of amount of air pressure in a tire, the wheel in inches. optional accessories are measured in kPa (kilopascal) (6) Load Range : Load Range. automatic transmission, power or psi (pounds per square inch) before a tire has built up heat (7) Service Description : The windows, power seats, and air conditioning. from driving. See Tire Pressure service description indicates the 0 387. load index and speed rating of a Aspect Ratio : The relationship tire. If two numbers are given as of a tire's height to its width. Curb Weight : The weight of a motor vehicle with standard and in the example, 120/116, then Belt : A rubber coated layer of this represents the load index for optional equipment including the cords between the plies and the maximum capacity of fuel, oil, single versus dual wheel usage tread. Cords may be made from (single/dual). The speed rating is and coolant, but without steel or other reinforcing passengers and cargo. the maximum speed a tire is materials. certified to carry a load. DOT Markings : A code molded into the sidewall of a tire signifying that the tire is in compliance with the U.S. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

386 Vehicle Care Department of Transportation Light Truck (LT-Metric) Tire : A Normal Occupant Weight : The (DOT) Motor Vehicle Safety tire used on light duty trucks and number of occupants a vehicle Standards. The DOT code some multipurpose passenger is designed to seat multiplied by includes the Tire Identification vehicles. 68 kg (150 lb). See Vehicle Load 0 Number (TIN), an alphanumeric Load Index : An assigned Limits 200. designator which can also number ranging from 1 to 279 Occupant Distribution : identify the tire manufacturer, that corresponds to the load Designated seating positions. production plant, brand, and carrying capacity of a tire. date of production. Outward Facing Sidewall : The Maximum Inflation Pressure : side of an asymmetrical tire that GVWR : Gross Vehicle Weight The maximum air pressure to has a particular side that faces Rating. See Vehicle Load Limits 0 which a cold tire can be inflated. outward when mounted on a 200. The maximum air pressure is vehicle. The side of the tire that GAWR FRT : Gross Axle Weight molded onto the sidewall. contains a whitewall, bears Rating for the front axle. See white lettering, or bears 0 Maximum Load Rating : The Vehicle Load Limits 200. load rating for a tire at the manufacturer, brand, and/or GAWR RR : Gross Axle Weight maximum permissible inflation model name molding that is Rating for the rear axle. See pressure for that tire. higher or deeper than the same Vehicle Load Limits 0 200. moldings on the other sidewall Maximum Loaded Vehicle of the tire. Intended Outboard Sidewall : Weight : The sum of curb The side of an asymmetrical tire weight, accessory weight, Passenger (P-Metric) Tire : A that must always face outward vehicle capacity weight, and tire used on passenger and when mounted on a vehicle. production options weight. some light duty trucks and multipurpose vehicles. Kilopascal (kPa) : The metric unit for air pressure. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 387 Recommended Inflation Tread : The portion of a tire that Vehicle Capacity Weight : The Pressure : Vehicle comes into contact with number of designated seating manufacturer's recommended the road. positions multiplied by tire inflation pressure as shown Treadwear Indicators : Narrow 68 kg (150 lb) plus the rated on the tire placard. See Tire bands, sometimes called wear cargo load. See Vehicle Load Pressure 0 387 and Limits 0 200. 0 bars, that show across the tread Vehicle Load Limits 200. of a tire when only 1.6 mm Vehicle Maximum Load on the Radial Ply Tire : A pneumatic (1/16 in) of tread remains. See Tire : Load on an individual tire tire in which the ply cords that When It Is Time for New Tires due to curb weight, accessory extend to the beads are laid at 0 399. weight, occupant weight, and 90 degrees to the centerline of UTQGS (Uniform Tire Quality cargo weight. the tread. Grading Standards) : A tire Vehicle Placard : A label Rim : A metal support for a tire information system that provides permanently attached to a and upon which the tire beads consumers with ratings for a vehicle showing the vehicle are seated. tire's traction, temperature, and capacity weight and the original Sidewall : The portion of a tire treadwear. Ratings are equipment tire size and between the tread and the bead. determined by tire recommended inflation pressure. manufacturers using See “Tire and Loading Speed Rating : An government testing procedures. Information Label” under Vehicle alphanumeric code assigned to The ratings are molded into the Load Limits 0 200. a tire indicating the maximum sidewall of the tire. See Uniform speed at which a tire can Tire Quality Grading 0 402. Tire Pressure operate. Tires need the correct amount of Traction : The friction between air pressure to operate the tire and the road surface. effectively. The amount of grip provided. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

388 Vehicle Care The Tire and Loading Do not forget the spare tire, { Warning Information label on the vehicle if the vehicle has one. See 0 Neither tire underinflation nor indicates the original equipment Full-Size Spare Tire 418 for overinflation is good. tires and the correct cold tire additional information. inflation pressures. The Underinflated tires, or tires How to Check that do not have enough air, recommended pressure is the can result in: minimum air pressure needed to Use a good quality pocket-type support the vehicle's maximum gauge to check tire pressure. . Tire overloading and load carrying capacity. Proper tire inflation cannot be overheating which could determined by looking at the tire. For additional information lead to a blowout. Check the tire inflation pressure regarding how much weight the when the tires are cold, meaning . Premature or vehicle can carry, and an the vehicle has not been driven irregular wear. example of the Tire and Loading for at least three hours or no Information label, see Vehicle . Poor handling. more than 1.6 km (1 mi). Load Limits 0 200. How the . Reduced fuel economy. vehicle is loaded affects vehicle Remove the valve cap from the Overinflated tires, or tires that handling and ride comfort. Never tire valve stem. Press the tire have too much air, can load the vehicle with more gauge firmly onto the valve to result in: weight than it was designed to get a pressure measurement. If the cold tire inflation pressure . Unusual wear. carry. matches the recommended . Poor handling. When to Check pressure on the Tire and . Rough ride. Check the pressure of the tires Loading Information label, no once a month or more. further adjustment is necessary. . Needless damage from If the inflation pressure is low, road hazards. add air until the recommended pressure is reached. If the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 389 inflation pressure is high, press Each tire, including the spare (if on the metal stem in the center Warning (Continued) provided), should be checked of the tire valve to release air. monthly when cold and inflated to This could cause a crash, and the inflation pressure recommended Re-check the tire pressure with you or others could be killed. by the vehicle manufacturer on the the tire gauge. Some high-speed rated tires vehicle placard or tire inflation require inflation pressure Put the valve caps back on the pressure label. (If your vehicle has adjustment for high-speed tires of a different size than the size valve stems to keep out dirt and operation. When speed limits and indicated on the vehicle placard or moisture and prevent leaks. Use road conditions allow the vehicle tire inflation pressure label, you only valve caps designed for the to be driven at high speeds, make should determine the proper tire vehicle by GM. TPMS sensors sure the tires are rated for inflation pressure for those tires.) could be damaged and would high-speed operation, are in As an added safety feature, your not be covered by the vehicle excellent condition, and are set to vehicle has been equipped with a warranty. the correct cold tire inflation tire pressure monitoring system pressure for the vehicle load. (TPMS) that illuminates a low tire Tire Pressure for pressure telltale when one or more High-Speed Operation of your tires is significantly Tire Pressure Monitor under-inflated. System { Warning Accordingly, when the low tire The Tire Pressure Monitor System pressure telltale illuminates, you Driving at high speeds, 160 km/h (TPMS) uses radio and sensor should stop and check your tires as (100 mph) or higher, puts technology to check tire pressure soon as possible, and inflate them additional strain on tires. levels. The TPMS sensors monitor to the proper pressure. Driving on a Sustained high-speed driving the air pressure in your tires and significantly under-inflated tire causes excessive heat buildup transmit tire pressure readings to a causes the tire to overheat and can and can cause sudden tire failure. receiver located in the vehicle. lead to tire failure. Under-inflation also reduces fuel efficiency and tire (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

390 Vehicle Care tread life, and may affect the of reasons, including the installation the tires and transmit the tire vehicle's handling and stopping of replacement or alternate tires or pressure readings to a receiver ability. wheels on the vehicle that prevent located in the vehicle. Please note that the TPMS is not a the TPMS from functioning properly. substitute for proper tire Always check the TPMS malfunction maintenance, and it is the driver's telltale after replacing one or more responsibility to maintain correct tire tires or wheels on your vehicle to pressure, even if under-inflation has ensure that the replacement or not reached the level to trigger alternate tires and wheels allow the illumination of the TPMS low tire TPMS to continue to function pressure telltale. properly. When a low tire pressure condition is detected, the TPMS illuminates Your vehicle has also been See Tire Pressure Monitor 0 the low tire pressure warning light equipped with a TPMS malfunction Operation 390. located on the instrument cluster. indicator to indicate when the See Radio Frequency Statement If the warning light comes on, stop system is not operating properly. 0 472. as soon as possible and inflate the The TPMS malfunction indicator is tires to the recommended pressure combined with the low tire pressure Tire Pressure Monitor shown on the Tire and Loading telltale. When the system detects a Operation Information label. See Vehicle Load malfunction, the telltale will flash for Limits 0 200. approximately one minute and then This vehicle may have a Tire remain continuously illuminated. Pressure Monitor System (TPMS). A message to check the pressure in This sequence will continue upon The TPMS is designed to warn the a specific tire displays in the Driver subsequent vehicle start-ups as driver when a low tire pressure Information Center (DIC). The low long as the malfunction exists. condition exists. TPMS sensors are tire pressure warning light and the mounted onto each tire and wheel DIC warning message come on at When the malfunction indicator is assembly, excluding the spare tire each ignition cycle until the tires are illuminated, the system may not be and wheel assembly. The TPMS inflated to the correct inflation able to detect or signal low tire sensors monitor the air pressure in pressure. If the vehicle has DIC pressure as intended. TPMS buttons, tire pressure levels can be malfunctions may occur for a variety GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 391 viewed. For additional information cycle until the problem is corrected. and details about the DIC operation Caution Some of the conditions that can and displays, see Driver Information cause these to come on are: Center (DIC) (Base Level) 0 147 or Tire sealant materials are not all the same. A non-approved tire . One of the road tires has been Driver Information Center (DIC) replaced with the spare tire. The (Midlevel and Uplevel) 0 148. sealant could damage the TPMS sensors. TPMS sensor damage spare tire does not have a The low tire pressure warning light caused by using an incorrect tire TPMS sensor. The malfunction may come on in cool weather when sealant is not covered by the light and the DIC message the vehicle is first started, and then should go off after the road tire vehicle warranty. Always use only turn off as the vehicle is driven. This is replaced and the sensor the GM approved tire sealant could be an early indicator that the matching process is performed air pressure is getting low and available through your dealer or successfully. See "TPMS Sensor needs to be inflated to the proper included in the vehicle. Matching Process" later in this pressure. section. A Tire and Loading Information label TPMS Malfunction Light and . The TPMS sensor matching shows the size of the original Message process was not done or not equipment tires and the correct The TPMS will not function properly completed successfully after inflation pressure for the tires when if one or more of the TPMS sensors rotating the tires. The they are cold. See Vehicle Load are missing or inoperable. When the malfunction light and the DIC 0 Limits 200, for an example of the system detects a malfunction, the message should go off after Tire and Loading Information label low tire pressure warning light successfully completing the and its location. Also see Tire flashes for about one minute and sensor matching process. See 0 Pressure 387. then stays on for the remainder of "TPMS Sensor Matching The TPMS can warn about a low the ignition cycle. A DIC warning Process" later in this section. tire pressure condition but it does message also displays. The . One or more TPMS sensors are not replace normal tire malfunction light and DIC warning missing or damaged. The maintenance. See Tire Inspection message come on at each ignition malfunction light and the DIC 0 396, Tire Rotation 0 396 and message should go off when the Tires 0 379. TPMS sensors are installed and GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

392 Vehicle Care the sensor matching process is When the low tire pressure warning performed successfully. See light comes on: Warning (Continued) your dealer for service. 1. Park the vehicle in a safe, level listed on the tire sidewall. See . Replacement tires or wheels do place. Tire Sidewall Labeling 0 381 and not match the original equipment 2. Set the parking brake firmly. Vehicle Load Limits 0 200. tires or wheels. Tires and wheels other than those recommended 3. Place the vehicle in P (Park). If the tire is overinflated by more could prevent the TPMS from 4. Add air to the tire that is than 35 kPa (5 psi), the horn will functioning properly. See Buying underinflated. The turn signal 0 sound multiple times and the turn New Tires 399. lamp will flash. signal lamp will continue to flash for . Operating electronic devices or When the recommended several seconds after filling stops. being near facilities using radio pressure is reached, the horn To release and correct the pressure, wave frequencies similar to the sounds once and the turn while the turn signal lamp is still TPMS could cause the TPMS signal lamp will stop flashing flashing, briefly press the center of sensors to malfunction. and briefly turn solid. the valve stem. When the If the TPMS is not functioning Repeat these steps for all recommended pressure is reached, properly, it cannot detect or signal a underinflated tires that have the horn sounds once. low tire pressure condition. See illuminated the low tire pressure If the turn signal lamp does not flash your dealer for service if the TPMS warning light. within 15 seconds after starting to malfunction light and DIC message inflate the tire, the tire fill alert has come on and stay on. { Warning not been activated or is not working. Tire Fill Alert (If Equipped) If the hazard warning flashers are Overinflating a tire could cause This feature provides visual and on, the tire fill alert visual feedback the tire to rupture and you or will not work properly. audible alerts outside the vehicle to others could be injured. Do not help when inflating an underinflated exceed the maximum pressure tire to the recommended cold tire pressure. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 393 The TPMS will not activate the tire TPMS Sensor Matching There are two minutes to match the fill alert properly under the following Process first tire/wheel position, and conditions: five minutes overall to match all four Each TPMS sensor has a unique tire/wheel positions. If it takes . There is interference from an identification code. The identification external device or transmitter. longer, the matching process stops code needs to be matched to a new and must be restarted. . The air pressure from the tire/wheel position after rotating the inflation device is not sufficient vehicle’s tires or replacing one or The TPMS sensor matching to inflate the tire. more of the TPMS sensors. Also, process is: the TPMS sensor matching process 1. Set the parking brake. . There is a malfunction in should be performed after replacing the TPMS. a spare tire with a road tire 2. Turn the ignition on without . There is a malfunction in the containing the TPMS sensor. The starting the vehicle. horn or turn signal lamps. malfunction light and the DIC 3. Uplevel DIC Only: Make sure message should go off at the next . The identification code of the the Tire Pressure info page ignition cycle. The sensors are TPMS sensor is not registered to option is turned on. The info matched to the tire/wheel positions, the system. pages on the DIC can be using a TPMS relearn tool, in the turned on and off through the . The battery of the TPMS sensor following order: driver side front tire, Options menu. See Driver is low. passenger side front tire, passenger Information Center (DIC) (Base 0 If the tire fill alert does not operate side rear tire, and driver side rear. Level) 147 or due to TPMS interference, move the See your dealer for service or to Driver Information Center (DIC) 0 vehicle about 1 m (3 ft) back or purchase a relearn tool. A TPMS (Midlevel and Uplevel) 148. relearn tool can also be purchased. forward and try again. If the tire fill 4. If the vehicle has an uplevel See Tire Pressure Monitor Sensor alert feature is not working, use a DIC, use the DIC controls on Activation Tool at tire pressure gauge. the right side of the steering www.gmtoolsandequipment.com or wheel to scroll to the Tire call 1-800-GM TOOLS Pressure screen under the DIC (1-800-468-6657). info page. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

394 Vehicle Care If the vehicle has a base level 7. Place the relearn tool against 12. Set all four tires to the DIC, use the trip odometer the tire sidewall, near the valve recommended air pressure reset stem to scroll to the Tire stem. Then press the button to level as indicated on the Tire Pressure screen. activate the TPMS sensor. and Loading Information label. 5. If the vehicle has an uplevel A horn chirp confirms that the sensor identification code has Trailer Tire Pressure DIC, press and hold the Monitoring Operation thumbwheel located in the been matched to this tire and center of the DIC controls on wheel position. If equipped, the Trailer Tire the right side of the steering 8. Proceed to the passenger side Pressure Monitoring System wheel. front tire, and repeat the (TTPMS) is designed to monitor the procedure in Step 7. pressure of the trailer tires and warn If the vehicle has a base level the driver when a low pressure DIC, press and hold the trip 9. Proceed to the passenger side condition exists. TTPMS sensors for odometer reset stem for about rear tire, and repeat the four tires are provided. The system five seconds. A message procedure in Step 7. can accommodate a trailer with up asking if the process should 10. Proceed to the driver side rear to six tires if additional sensors are begin should appear. Select tire, and repeat the procedure purchased from the dealer. Also, the yes and press the trip in Step 7. The horn sounds two system can be paired with up to five odometer reset stem to confirm times to indicate the sensor individual trailers. the selection. identification code has been Prior to use, the vehicle must learn The horn sounds twice to matched to the driver side rear the sensors by following the signal the receiver is in relearn tire, and the TPMS sensor learning process. See Trailering App mode and the TIRE matching process is no longer 0 310. LEARNING ACTIVE message active. The TIRE LEARNING displays on the DIC screen. ACTIVE message on the DIC 6. Start with the driver side display screen goes off. front tire. 11. Turn the vehicle off. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 395 trailer tire placard on the trailer or causes for high trailer tire the trailer tire sidewall for the temperature are underinflation, recommended tire pressure. overloading, or tire damage. The system is compatible with trailer TTPMS Malfunction Message tires that have placard pressure values from 103 - 689 kpa The TTPMS will not function (15 - 100 psi). The hole in the wheel properly if one or more of the trailer for the tire stem must be 11.43 mm tire sensors are missing or (0.453 in) in diameter. Use of the inoperable. If the system detects a pressure sensors on a wheel with a malfunction, a DIC message different stem hole size could result indicates that the system requires in loss of air from the tire. service. Some of the conditions that can cause the service message to Contact your trailer service center or If a low trailer tire pressure condition occur are: tire service center to have the is detected, the TTPMS displays a pressure sensors installed inside warning message on the DIC. If the . One of the trailer tires has been the trailer tires. The technician warning message is displayed, stop replaced with the spare tire should insert the sensor stem as soon as possible and inflate the which does not have a learned through the hole in the trailer wheel. tires to the recommended pressure TTPMS sensor. The DIC When the sensor is correctly shown on the tire placard on the message should turn off after the positioned, the nut on the sensor trailer. pressure sensor is installed in stem should be tightened to 8 Y the tire, and the learning process (6 lb ft). When mounting the trailer In addition, the TTPMS monitors the is performed successfully. See tire onto the trailer wheel be careful temperature of the trailer tires. If the "TTPMS Sensor Learning not to damage the sensor. system detects a high temperature Process" under Trailering App on one or more of the trailer tires, a 0 310. The Trailering App can be used to warning message will be displayed view the tire pressures after the on the DIC. If this warning message . The TTPMS sensor learning recommended trailer tire pressures is displayed, stop as soon as process was not done or not have been entered. Refer to the possible, and inspect the completed successfully. The DIC overheated trailer tire. Common message should go off after GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

396 Vehicle Care successfully completing the If the TTPMS is not functioning . The tire has a bump, bulge, sensor learning process. See properly, it cannot detect or signal a or split. "TTPMS Sensor Learning low tire condition. See your dealer Process" under Trailering App for service if the DIC message . The tire has a puncture, cut, 0 310. comes on and stays on when the or other damage that cannot be repaired well because of . One or more TTPMS sensors trailer tire pressures have been are missing or damaged. The checked and determined to be the size or location of the DIC message should go off correct. damage. when the TTPMS sensors are installed and the sensor learning Tire Inspection Tire Rotation process is performed We recommend that the tires, Tires should be rotated every successfully. See "TTPMS including the spare tire, if the 12 000 km (7,500 mi). See Sensor Learning Process" under vehicle has one, be inspected 0 Trailering App 0 310. Maintenance Schedule 441. for signs of wear or damage at . Operating electronic devices or least once a month. Tires are rotated to achieve a being near facilities using radio more uniform wear for all tires. wave frequencies similar to the Replace the tire if: The first rotation is the most TTPMS could cause interference . The indicators at three or important. to the TTPMS which could more places around the tire cause loss of signal reception Anytime unusual wear is from the sensor. can be seen. noticed, rotate the tires as soon . There is cord or fabric as possible, check for proper tire . If the system does not receive inflation pressure, and check for the signal from an individual showing through the tire's sensor, an error message may rubber. damaged tires or wheels. If the unusual wear continues after the not occur until the vehicle has . The tread or sidewall is been driver for a period of time. rotation, check the wheel cracked, cut, or snagged alignment. See When It Is Time deep enough to show cord or for New Tires 0 399 and fabric. Wheel Replacement 0 403. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 397 and “Wheel Nut Torque” under Capacities and Specifications 0 458 and “Removing the and Installing the Spare Tire” under Tire Changing 0 407. The outer tire on a dual wheel setup generally wears faster than the inner tire. Tires last longer and wear more evenly if they are rotated. See Tire Inspection 0 396 and Use this rotation pattern when Tire Rotation 0 396. Also see Use this rotation pattern when rotating the tires if the vehicle Maintenance Schedule 0 441. rotating the tires if the vehicle has single rear wheels. has dual rear wheels (except polished forged aluminum Dual Tire Rotation { Warning wheels). When the vehicle is new, If the vehicle is operated with a or whenever a wheel, wheel tire that is underinflated, the tire Vehicles with polished forged bolt, or wheel nut is replaced or can overheat. An overheated tire aluminum dual wheels have serviced, check the wheel nut can lose air suddenly or catch three unique wheels; a front, a torque after 160, 1 600, and fire. You or others could be rear outer and a rear inner. 10 000 km (100, 1,000, and injured. Properly inflate all tires, These wheels cannot be rotated 6,000 mi) of driving. For proper including the spare. to another position, however, torque and wheel nut tightening they can be rotated from left to right to the same position. information, see “Removing the See Tire Pressure 0 387, for Flat Tire and Installing the Spare information on proper tire Tire” under Tire Changing 0 407 inflation. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

398 Vehicle Care When installing dual wheels, check that the vent holes in the Warning (Continued) inner and outer wheels on each The wheel could come off and side are lined up. cause a crash. When Adjust the front and rear tires to changing a wheel, remove any the recommended inflation rust or dirt from places where pressure on the Tire and the wheel attaches to the Loading Information label after vehicle. In an emergency, a the tires have been rotated. See cloth or a paper towel can be Tire Pressure 0 387 and used; however, use a scraper Vehicle Load Limits 0 200. or wire brush later to remove Use this rotation pattern when Check that all wheel nuts are all rust or dirt. rotating the tires if the vehicle properly tightened. See “Wheel has polished forged aluminum Nut Torque” under Capacities Lightly coat the inner diameter of dual rear wheels. The spare and Specifications 0 458, and the wheel hub opening with wheel can be used in any “Removing the Flat Tire and wheel bearing grease after a position in the event of a flat tire, Installing the Spare Tire” under wheel change or tire rotation to and can be rotated with the rear Tire Changing 0 407. prevent corrosion or rust inner wheels. After the flat tire is build-up. Do not get grease on repaired, if the spare is not on { Warning the flat wheel mounting surface one of the inner rear positions, it or on the wheel nuts or bolts. must be replaced by the correct Rust or dirt on a wheel, or on Reset the Tire Pressure Monitor wheel in the front or rear outer the parts to which it is System (TPMS), if the vehicle positions. fastened, can make wheel has one. See Tire Pressure nuts become loose after time. Monitor Operation 0 390. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 399 If the full-size tire is part of the Treadwear indicators are one way to example, the third week of the year tire rotation, make sure the tire tell when it is time for new tires. 2010 would have a four-digit DOT rotated into the spare position is Treadwear indicators appear when date of 0310. the tires have only 1.6 mm (1/16 in) stored securely. Push, pull, and Vehicle Storage then try to rotate or turn the tire. or less of tread remaining. Some commercial truck tires may not have If it moves, use the wheel Tires age when stored normally treadwear indicators. See Tire mounted on a parked vehicle. Park wrench/hoist shaft to tighten the Inspection 0 396 and 0 a vehicle that will be stored for at cable. See Tire Changing 407. Tire Rotation 0 396 for additional least a month in a cool, dry, clean information. area away from direct sunlight to When It Is Time for New The rubber in tires ages over time. slow aging. This area should be free Tires This also applies to the spare tire, of grease, gasoline, or other if the vehicle has one, even if it is substances that can deteriorate Factors, such as maintenance, rubber. temperatures, driving speeds, never used. Multiple factors vehicle loading, and road conditions including temperatures, loading Parking for an extended period can affect the wear rate of the tires. conditions, and inflation pressure cause flat spots on the tires that maintenance affect how fast aging may result in vibrations while takes place. GM recommends that driving. When storing a vehicle for tires, including the spare if at least a month, remove the tires or equipped, be replaced after six raise the vehicle to reduce the years, regardless of tread wear. To weight from the tires. identify the age of a tire, use the tire manufacture date which is the last Buying New Tires four digits of the DOT Tire Identification Number (TIN) which is GM has developed and matched molded into one side of the tire specific tires for the vehicle. The sidewall. The first two digits original equipment tires installed represent the week (01-52) and the were designed to meet General last two digits, the year. For Motors Tire Performance Criteria GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

400 Vehicle Care Specification (TPC Spec) tread depth on all tires will help system rating. When to maintain the performance of Warning (Continued) replacement tires are needed, the vehicle. Braking and Only your dealer or authorized GM strongly recommends handling performance may be tire service center should buying tires with the same TPC adversely affected if all the tires mount or dismount the tires. Spec rating. are not replaced at the same GM's exclusive TPC Spec time. If proper rotation and maintenance have been done, system considers over a dozen { Warning critical specifications that impact all four tires (six for dual rear wheels) should wear out at the overall performance of the Mixing tires of different sizes, about the same time. See Tire vehicle, including brake system tread patterns, or types on the Rotation 0 396 for information performance, ride and handling, same axle may cause loss of on proper tire rotation. However, traction control, and tire control of the vehicle, resulting if it is necessary to replace only pressure monitoring in a crash or other vehicle one axle set of worn tires, place performance. GM's TPC Spec damage. Use the same size, the new tires on the rear axle number is molded onto the tire's load range, and type of tires (two for single rear wheels, four sidewall near the tire size. If the as the original tires. tires have an all-season tread for dual rear wheels). This vehicle may have a design, the TPC Spec number different size spare than the will be followed by MS for mud { Warning road tires originally installed and snow. See Tire Sidewall Tires could explode during on the vehicle. When new, the Labeling 0 381 for additional improper service. Attempting vehicle included a spare tire information. to mount or dismount a tire and wheel assembly with a GM recommends replacing worn could cause injury or death. similar overall diameter as the tires in complete sets of four (six (Continued) road tires and wheels, so it is for dual rear wheels). Uniform (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 401 tires’ maximum speed capability Different Size Tires and Warning (Continued) when using winter tires with a Wheels lower speed rating. all right to drive on it. The If wheels or tires are installed that spare tire was developed for If the vehicle tires must be are a different size than the original use on this vehicle and will not replaced with a tire that does not equipment wheels and tires, vehicle affect vehicle handling. have a TPC Spec number, make performance, including its braking, sure they are the same size, ride and handling characteristics, load range, speed rating, and stability, and resistance to rollover may be affected. If the vehicle has { Warning construction (radial) as the original tires. electronic systems such as antilock brakes, rollover airbags, traction Using bias-ply tires on the Vehicles that have a tire control, electronic stability control, vehicle may cause the wheel pressure monitoring system or All-Wheel Drive, the performance rim flanges to develop cracks could give an inaccurate of these systems can also be after many miles of driving. low-pressure warning if non-TPC affected. A tire and/or wheel could fail Spec rated tires are installed. suddenly and cause a crash. See Tire Pressure Monitor { Warning Use only radial-ply tires with System 0 389. the wheels on the vehicle. If different sized wheels are used, The Tire and Loading there may not be an acceptable Information label indicates the level of performance and safety if Winter tires with the same speed original equipment tires on the tires not recommended for those rating as the original equipment vehicle. See Vehicle Load Limits wheels are selected. This tires may not be available for H, 0 200 for the label location and increases the chance of a crash V, W, Y and ZR speed rated more information about the Tire and serious injury. Only use GM tires. Never exceed the winter and Loading Information label. specific wheel and tire systems (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

402 Vehicle Care compact spare tires, tires with Treadwear Warning (Continued) nominal rim diameters of The treadwear grade is a developed for the vehicle, and 10 to 12 inches (25 to 30 cm), comparative rating based on the have them properly installed by a or to some limited-production wear rate of the tire when tested GM certified technician. tires. under controlled conditions on a While the tires available on specified government test See Buying New Tires 0 399 and General Motors passenger cars course. For example, a tire Accessories and Modifications and light trucks may vary with graded 150 would wear one and 0 329. respect to these grades, they one-half (1½) times as well on must also conform to federal the government course as a tire Uniform Tire Quality safety requirements and graded 100. The relative Grading additional General Motors Tire performance of tires depends Performance Criteria (TPC) upon the actual conditions of The following information relates standards. their use, however, and may to the system developed by the depart significantly from the United States National Highway Quality grades can be found norm due to variations in driving Traffic Safety Administration where applicable on the tire habits, service practices and (NHTSA), which grades tires by sidewall between tread shoulder differences in road treadwear, traction, and and maximum section width. For characteristics and climate. temperature performance. This example: applies only to vehicles sold in Treadwear 200 Traction AA Traction the United States. The grades Temperature A The traction grades, from are molded on the sidewalls of highest to lowest, are AA, A, B, most passenger car tires. The All Passenger Car Tires Must Conform to Federal Safety and C. Those grades represent Uniform Tire Quality Grading the tire's ability to stop on wet (UTQG) system does not apply Requirements In Addition To These Grades. pavement as measured under to deep tread, winter tires, controlled conditions on GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 403 specified government test performance which all vehicle is significantly pulling to one surfaces of asphalt and passenger car tires must meet side or the other. Some slight pull to concrete. A tire marked C may under the Federal Motor Safety the left or right, depending on the have poor traction performance. Standard No. 109. Grades B and crown of the road and/or other road Warning: The traction grade A represent higher levels of surface variations such as troughs or ruts, is normal. If the vehicle is assigned to this tire is based on performance on the laboratory vibrating when driving on a smooth straight-ahead braking traction test wheel than the minimum road, the tires and wheels may need tests, and does not include required by law. Warning: The to be rebalanced. See your dealer acceleration, cornering, temperature grade for this tire is for proper diagnosis. hydroplaning, or peak traction established for a tire that is characteristics. properly inflated and not Wheel Replacement overloaded. Excessive speed, Temperature Replace any wheel that is bent, underinflation, or excessive cracked, or badly rusted or The temperature grades are A loading, either separately or in corroded. If wheel nuts keep coming (the highest), B, and C, combination, can cause heat loose, the wheel, wheel bolts and representing the tire's resistance buildup and possible tire failure. wheel nuts should be replaced. to the generation of heat and its If the wheel leaks air, replace it. ability to dissipate heat when Wheel Alignment and Tire Some aluminum wheels can be tested under controlled Balance repaired. See your dealer if any of conditions on a specified indoor these conditions exist. The tires and wheels were aligned laboratory test wheel. Sustained Your dealer will know the kind of and balanced at the factory to high temperature can cause the wheel that is needed. provide the longest tire life and best material of the tire to degenerate overall performance. Adjustments to Each new wheel should have the and reduce tire life, and wheel alignment and tire balancing same load-carrying capacity, excessive temperature can lead are not necessary on a regular diameter, width, offset and be to sudden tire failure. The grade basis. Consider an alignment check mounted the same way as the one it C corresponds to a level of if there is unusual tire wear or the replaces. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

404 Vehicle Care Replace wheels, wheel bolts, wheel Whenever a wheel, wheel bolt, Tire Chains nuts, or Tire Pressure Monitor or wheel nut is replaced on a dual System (TPMS) sensors with new wheel setup, check the wheel nut GM original equipment parts. torque after 160,1 600, and { Warning 10 000 km (100,1,000, and If the vehicle has LT275/65R18, 6,000 mi) of driving. For proper { Warning 275/60R20, LT275/65R20, torque, see Wheel Nut Torque “ ” or 275/50R22 size tires, do not Using the wrong replacement under Capacities and Specifications 0 458. use tire chains. If the vehicle is a wheels, wheel bolts, or wheel 1500 Series with LT265/70R17 nuts can be dangerous. It could See If a Tire Goes Flat 0 405 for size tires, do not use tire chains. affect the braking and handling of more information. They can damage the vehicle the vehicle. Tires can lose air, because there is not enough and cause loss of control, causing Used Replacement Wheels clearance. Tire chains used on a a crash. Always use the correct vehicle without the proper amount wheel, wheel bolts, and wheel { Warning of clearance can cause damage nuts for replacement. Replacing a wheel with a used to the brakes, suspension, one is dangerous. How it has or other vehicle parts. The area been used or how far it has been damaged by the tire chains could Caution driven may be unknown. It could cause you to lose control of the fail suddenly and cause a crash. vehicle, and you or others may be The wrong wheel can also cause When replacing wheels, use a injured in a crash. problems with bearing life, brake new GM original equipment Use another type of traction cooling, speedometer or wheel. device only if its manufacturer odometer calibration, headlamp recommends it for use on the aim, bumper height, vehicle vehicle's tire size combination ground clearance, and tire or tire and road conditions. Follow that chain clearance to the body and chassis. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 405 leak out slowly. But if there ever is a Warning (Continued) Caution (Continued) blowout, here are a few tips about what to expect and what to do: manufacturer's instructions. To vehicle has 255/70R17, help avoid damage to the vehicle, LT245/75R17, or LT275/70R18 If a front tire fails, the flat tire drive slowly, readjust, or remove size tires, they may be installed creates a drag that pulls the vehicle the device if it is contacting the on the tires of the front and rear toward that side. Take your foot off vehicle, and do not spin the axle. If the vehicle is a 2500 the accelerator pedal and grip the vehicle's wheels. Series with LT265/70R17 size steering wheel firmly. Steer to maintain lane position, and then tires, chains may be installed on If you do find traction devices that gently brake to a stop, well off the the tires of both the front and rear will fit, install them on the rear road, if possible. tires. axle. Tighten them as tightly as possible with the ends securely A rear blowout, particularly on a fastened. Drive slowly and follow curve, acts much like a skid and the chain manufacturer's may require the same correction as Caution instructions. If you can hear the used in a skid. Stop pressing the chains contacting the vehicle, accelerator pedal and steer to Use tire chains only where legal stop and retighten them. If the straighten the vehicle. It may be very bumpy and noisy. Gently brake and only when necessary. Use contact continues, slow down chains that are the proper size for to a stop, well off the road, until it stops. Driving too fast or if possible. the tires. If the vehicle has spinning the wheels with chains 265/70R17 or 265/65R18 size on will damage the vehicle. tires, they may be installed on the { Warning tires of the rear axle only. If the vehicle is a dual rear wheel model If a Tire Goes Flat Driving on a flat tire will cause permanent damage to the tire. and has LT235/80R17 tires, It is unusual for a tire to blowout chains may be installed on the Re-inflating a tire after it has been while driving, especially if the tires driven on while severely tires of the rear axle only. If the are maintained properly. If air goes (Continued) out of a tire, it is much more likely to (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

406 Vehicle Care If a tire goes flat, avoid further tire Warning (Continued) and wheel damage by driving slowly Warning (Continued) to a level place, well off the road, underinflated or flat may cause a if possible. Turn on the hazard 4. Turn off the engine and do blowout and a serious crash. warning flashers. See Hazard not restart while the vehicle Never attempt to re-inflate a tire Warning Flashers 0 169. is raised. that has been driven on while 5. Do not allow passengers to severely underinflated or flat. { Warning remain in the vehicle. Have your dealer or an authorized 6. Place wheel blocks, tire service center repair or Changing a tire can be if equipped, on both sides of replace the flat tire as soon as dangerous. The vehicle can slip the tire at the opposite possible. off the jack and roll over or fall corner of the tire being causing injury or death. Find a changed. level place to change the tire. To help prevent the vehicle from { Warning When the vehicle has a flat tire (2), moving: use the following example as a Lifting a vehicle and getting under 1. Set the parking brake firmly. guide to assist in the placement of it to do maintenance or repairs is the wheel blocks (1), if equipped. dangerous without the 2. Put the shift lever in P (Park). appropriate safety equipment and training. If a jack is provided with 3. For vehicles with four-wheel the vehicle, it is designed only for drive with an N (Neutral) changing a flat tire. If it is used for transfer case position, be anything else, you or others could sure the transfer case is in a be badly injured or killed if the drive gear — not in vehicle slips off the jack. If a jack N (Neutral). is provided with the vehicle, only (Continued) use it for changing a flat tire. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 407 1. Wheel Block (If Equipped) 6. Wing Nut Retaining Wheel 2. Flat Tire Blocks The following information explains The equipment is under the second how to use the jack and change row seats, if equipped, or behind the a tire. front row seats on regular cab models. Tire Changing 1. Turn the knob on the jack Removing the Spare Tire and counterclockwise to lower the jack head to release the jack Tools from its holder. 2. Turn the wing nut counterclockwise to remove the 1. Spare Tire (Valve Stem wheel blocks and the wheel Pointed Down) block retainer. 2. Tire/Wheel Retainer 3. Turn the wing nut used to 3. Hoist Cable retain the storage bag and 4. Hoist Assembly tools counterclockwise to 5. Hoist Shaft remove it. 6. Jack Handle Extensions Use the jack handle extensions and 7. Wheel Wrench the wheel wrench to remove the 8. Spare Tire Lock (If underbody-mounted spare tire. Equipped) 9. Hoist Shaft Access Hole 1. Jack 10. Hoist End of Extension Tool 2. Jack Knob 1. Open the spare tire lock cover 3. Tool Kit on the bumper and use the 4. Wing Nut Retaining Tool Kit ignition key to remove the 5. Wheel Blocks spare tire lock (8). To remove GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

408 Vehicle Care the spare tire lock, insert the 4. Insert the hoist end (open ignition key, turn, and pull end) (10) of the extension straight out. through the hole (9) in the rear bumper. Do not use the chiseled end of the wheel wrench. Be sure the hoist end of the extension (10) connects to the hoist shaft. The ribbed square end of the extension is used to lower the spare tire. Spare Tire Cable (If Equipped) 5. Turn the wheel wrench 2. Assemble the wheel wrench (7) counterclockwise to lower the 3. If the vehicle is equipped with a and the two jack handle spare tire to the ground. spare tire cable disconnect the extensions (6), as shown. Continue to turn the wheel cable from the attachment on wrench until the spare tire can the frame by unclipping it from be pulled out from under the the frame attachment bracket. vehicle. 6. Pull the spare tire out from under the vehicle. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 409 9. If equipped with a spare tire cable remove the cable from the spare tire by passing the clip through the looped end of the cable. Removing the Flat Tire and Installing the Spare Tire Use the following pictures and 7. Tilt the tire toward the vehicle All Other Models instructions to remove the flat tire with some slack in the cable to Tilt the retainer and pull it and raise the vehicle. access the tire/wheel retainer. through the center of the wheel along with the cable and spring. 8. Put the spare tire near the flat tire.

1500 Models

1. Jack 2. Wheel Blocks 3. Jack Handle 4. Jack Handle Extensions 5. Wheel Wrench GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

410 Vehicle Care The tools you will be using include with the center cap after they back side, and use a jack the jack (1), the wheel blocks (2), are loosened. Remove the handle extension to push out the jack handle (3), the jack handle entire center cap. the center cap. extensions (4), and the wheel wrench (5). 1. Do a safety check before proceeding. See If a Tire Goes Flat 0 405.

If the wheel has a smooth center cap, concealing access to the wheel nuts, place the chisel end of the wheel wrench 3. Use the wheel wrench and turn in the slot on the wheel, and it counterclockwise to loosen gently pry it out. the wheel nuts. Do not remove If the wheel’s center cap does the wheel nuts yet. not conceal the wheel nuts, the 2. If the vehicle has wheel nut center cap may remain during { Warning caps, loosen them by turning wheel removal. If the removed the wheel wrench wheel is to be stowed in the To avoid personal injury and counterclockwise. hoist, the cap needs to be vehicle damage, disable the detached from the wheel. power assist steps before using a If the vehicle has a center cap Access the wheel from the with wheel nut caps, the wheel (Continued) nut caps are designed to stay GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 411

Warning (Continued)

jack or placing an object under the vehicle. See Power Assist Steps 0 34.

Front Position — All Other Models Rear Position — 1500 Models 4. If the flat tire is on the front of 5. If the flat tire is on the rear, the vehicle, position the jack position the jack under the rear under the bracket attached to axle about 5 cm (2 in) inboard the vehicle's frame, behind the of the bracket. flat tire, as shown.

Front Position — 1500 Models GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

412 Vehicle Care

{ Warning

Getting under a vehicle when it is lifted on a jack is dangerous. If the vehicle slips off the jack, you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack.

Rear Position All Other Models { Warning 7. Remove all the wheel nuts and For all other models, position take off the flat tire. the jack under the rear axle Raising the vehicle with the jack between the spring anchor and improperly positioned can { Warning the shock absorber bracket. damage the vehicle and even make the vehicle fall. To help Rust or dirt on a wheel, or on If a snow plow has been added avoid personal injury and vehicle to the front of the vehicle, lower the parts to which it is damage, be sure to fit the jack lift the snow plow fully before fastened, can make wheel raising the vehicle. head into the proper location nuts become loose after time. before raising the vehicle. The wheel could come off and Make sure that the jack head is positioned so that the rear axle cause a crash. When is resting securely between the 6. Turn the wheel wrench changing a wheel, remove any grooves that are on the clockwise to raise the vehicle. rust or dirt from places where jack head. Raise the vehicle far enough the wheel attaches to the off the ground so there is vehicle. In an emergency, a enough room for the spare tire to fit under the wheel well. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 413

Warning (Continued) { Warning Warning (Continued) cloth or a paper towel can be Never use oil or grease on bolts If any stud is damaged because used; however, use a scraper or nuts because the nuts might of a loose-running wheel, it could or wire brush later to remove come loose. The vehicle's wheel be that all of the studs are all rust or dirt. could fall off, causing a crash. damaged. To be sure, replace all studs on the wheel. If the stud 10. Put the wheel nuts back on holes in a wheel have become with the rounded end of the larger, the wheel could collapse in nuts toward the wheel. operation. Replace any wheel if its stud holes have become larger 11. Tighten each wheel nut by or distorted in any way. Inspect hand. Then use the wheel hubs and hub‐piloted wheels for wrench to tighten the nuts until damage. Because of loose the wheel is held against running wheels, piloting pad the hub. damage may occur and require 12. Turn the wheel wrench replacement of the entire hub, for counterclockwise to lower the proper centering of the wheels. vehicle. Lower the jack When replacing studs, hubs, completely. wheel nuts or wheels, be sure to 8. Remove any rust or dirt from use GM original equipment parts. the wheel bolts, mounting { Warning surfaces, and spare wheel. If wheel studs are damaged, they 9. Install the spare tire. can break. If all the studs on a wheel broke, the wheel could come off and cause a crash. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

414 Vehicle Care have a tire removed or serviced. { Warning Caution (Continued) See Capacities and Specifications 0 458. Wheel nuts that are improperly or torque specification. See incorrectly tightened can cause Capacities and Specifications When reinstalling the regular wheel the wheels to become loose or 0 458 for the wheel nut torque and tire, also reinstall either the come off. The wheel nuts should specification. center cap, or bolt-on hub cap, be tightened with a torque wrench depending on what the vehicle is to the proper torque specification equipped with. For center caps, place the cap on the wheel and tap after replacing. Follow the torque it into place until it seats flush with specification supplied by the the wheel. The cap only goes on aftermarket manufacturer when one way. Be sure to line up the tab using accessory locking wheel on the center cap with the nuts. See Capacities and indentation on the wheel. For 0 Specifications 458 for original bolt-on hub caps, align the plastic equipment wheel nut torque nut caps with the wheel nuts and specifications. then tighten by hand. Then use the wheel wrench to tighten. 13. Tighten the nuts firmly in a crisscross sequence, as Storing a Flat or Spare Tire Caution shown, by turning the wheel and Tools wrench clockwise. Improperly tightened wheel nuts can lead to brake pulsation and For vehicles with dual wheels, have { Warning a technician check the wheel nut rotor damage. To avoid expensive tightness of all wheels with a torque Storing a jack, a tire, or other brake repairs, evenly tighten the wrench after the first 160, 1 600 and equipment in the passenger wheel nuts in the proper 10 000 km (100, 1,000 and 6,000 mi). compartment of the vehicle could sequence and to the proper Repeat this service whenever you cause injury. In a sudden stop or (Continued) (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 415 Store the tire under the rear of the Warning (Continued) Caution (Continued) vehicle in the spare tire carrier. collision, loose equipment could pointing down and have the strike someone. Store all these in wheel/tire repaired as soon as the proper place. possible.

{ Warning Caution

Failure to follow these tire storage The tire hoist can be damaged if instructions carefully could result there is no tension on the cable in personal injury or property when using it. To have the damage if the hoist cable fails or necessary tension, the spare or if the tire comes loose. Make sure road tire and wheel assembly the tire is stored securely before must be installed on the tire hoist 1. Spare Tire (Valve Stem driving. to use it. Pointed Down) 2. Tire/Wheel Retainer 3. Hoist Cable Caution { Warning 4. Hoist Assembly 5. Hoist Shaft Storing an aluminum wheel with a An improperly stored spare tire 6. Jack Handle Extensions flat tire under your vehicle for an could come loose and cause a 7. Wheel Wrench extended period of time or with crash. To avoid personal injury or 8. Spare Tire Lock (If the valve stem pointing up can property damage, always store Equipped) damage the wheel. Always stow the spare tire when the vehicle is 9. Hoist Shaft Access Hole the wheel with the valve stem parked on a level surface. 10. Hoist End of Extension Tool (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

416 Vehicle Care 1. If equipped with a spare tire cable, reinstall the cable to the spare wheel by looping the cable around a wheel vent window then pass the clip end of the cable through the looped end. The excess cable wire should be on the valve stem side of the spare tire. 2. Put the tire on the ground at 4. Attach the wheel wrench (7) the rear of the vehicle with the and extensions (6) together, as valve stem pointed down, and shown. 11. Spare Tire Cable (If to the rear. Equipped) 3. Pull the cable and spring Caution through the center of the Use of an air wrench or other wheel. Tilt the wheel retainer power tools with the hoist plate down and through the mechanism is not recommended center wheel. and could damage the system. Make sure the retainer is fully Use only the tools supplied with seated across the underside of the hoist mechanism. the wheel. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 417

5. Insert the hoist end (10) through the hole (9) in the rear bumper and onto the hoist shaft. 7. If equipped with a spare tire 9. Make sure the tire is stored Do not use the chiseled end of cable, orient the cable by securely. Push, pull, and then the wheel wrench. rotating the spare tire so that try to turn the tire. If the tire 6. Raise the tire part way upward. the cable is by the frame moves, use the wheel wrench Make sure the retainer is attachment location. to tighten the cable. seated in the wheel opening. 8. Raise the tire fully against the underside of the vehicle by turning the wheel wrench clockwise until you hear two clicks or feel it skip twice. You cannot overtighten the cable. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

418 Vehicle Care

Return the jack and tools to their original location in the vehicle. See “Removing the Spare Tire and If equipped with a spare tire Correctly Stored Tools.” cable, reattach the clip to the frame attachment bracket. Note Full-Size Spare Tire that there may be slack in the If this vehicle came with a full-size cable. spare tire, it was fully inflated when Repeat this tightness check new, however, it can lose air over procedure when checking the time. Check the inflation pressure spare tire pressure according regularly. See Tire Pressure 0 387 to the scheduled maintenance and information or any time the Vehicle Load Limits 0 200. For spare tire is handled due to instructions on how to remove, service of other components. install, or store a spare tire, see Tire Changing 0 407. Incorrectly Stored If equipped with a temporary use 10. Reinstall the spare tire lock, full-size spare tire, it is indicated on if the vehicle has one. the tire sidewall. See Tire Sidewall Labeling 0 381. This spare tire GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 419 should not be driven on over This spare tire was developed for Jump Starting 112 km/h (70 mph), or 88 km/h use on this vehicle, so it is all right (55 mph) when pulling a trailer, at to drive on it. If the vehicle has the proper inflation pressure. Repair four-wheel drive and a different size Jump Starting - North and replace the road tire as soon as spare tire is installed, drive only in America it is convenient, and stow the spare two-wheel drive. For more information about the tire for future use. After installing the spare tire on the vehicle battery, see Battery - North vehicle, stop as soon as possible America 0 358. Caution and check that the spare tire is If the vehicle's battery (or batteries) correctly inflated. If the vehicle has four-wheel drive has run down, you may want to use and a different size spare tire is Have the damaged or flat road tire another vehicle and some jumper installed, do not drive in repaired or replaced and installed cables to start your vehicle. Be sure four-wheel drive until the flat tire back onto the vehicle as soon as to use the following steps to do it is repaired and/or replaced. The possible so the spare tire will be safely. available in case it is needed again. vehicle could be damaged and the repairs would not be covered Do not mix tires and wheels of { Warning by the warranty. Never use different sizes, because they will not WARNING: Battery posts, four-wheel drive when a different fit. Keep your spare tire and its terminals, and related size spare tire is installed on the wheel together. If the vehicle has a accessories contain lead and lead vehicle. spare tire that does not match the original road tires and wheels in size compounds, chemicals known to and type, do not include the spare in the State of California to cause The vehicle may have a different the tire rotation. cancer and birth defects or other size spare tire than the road tires reproductive harm. Batteries also originally installed on the vehicle. contain other chemicals known to the State of California to cause cancer. WASH HANDS AFTER (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

420 Vehicle Care 1. Good Battery Positive Warning (Continued) Caution Terminal 2. Good Battery Negative HANDLING. For more information Ignoring these steps could result Terminal go to www.P65Warnings.ca.gov/ in costly damage to the vehicle 3. Discharged Battery Remote passenger-vehicle. that would not be covered by the Negative Terminal vehicle warranty. Trying to start 4. Discharged Battery Remote See California Proposition the vehicle by pushing or pulling it Positive Terminal 65 Warning 0 329 and the back will not work, and it could damage The jump start positive post (1) and cover. the vehicle. negative post (2) are on the battery of the vehicle providing the jump { Warning start. Batteries can hurt you. They can The jump start positive post (4) and be dangerous because: the negative grounding point (3) for the discharged battery are on the . They contain acid that can passenger side of the vehicle. burn you. The positive jump start connection . They contain gas that can for the discharged battery is under a explode or ignite. cover. Slide the cover to expose the . They contain enough terminal. electricity to burn you. If you do not follow these steps All Engines Except 6.6L exactly, some or all of these things can hurt you. V8 Engine (L8T) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 421 The jump start positive post (3) and another vehicle to start your the negative grounding point (4) for diesel engine. If your vehicle the discharged battery are on the has more than one battery, passenger side of the vehicle. using the battery that is closer The positive jump start connection to the starter will reduce for the discharged battery is under a electrical resistance. This is cover. Slide the cover to expose the located on the passenger side, terminal. in the rear of the engine compartment. 1. Check the other vehicle. It must have a 12-volt battery 3. Get the vehicles close enough with a negative ground system. so the jumper cables can reach, but be sure the vehicles 6.6L V8 Engine (L8T) Only are not touching each other. Caution If they are, it could cause an 1. Good Battery Positive unwanted ground connection. If the other vehicle does not have Terminal You would not be able to start 2. Good Battery Negative a 12-volt system with a negative your vehicle, and the bad Terminal ground, both vehicles can be grounding could damage the 3. Discharged Battery Remote damaged. Only use a vehicle that electrical systems. Positive Terminal has a 12-volt system with a negative ground for jump starting. To avoid the possibility of the 4. Discharged Battery Remote vehicles rolling, set the parking Negative Terminal brake firmly on both vehicles The jump start positive post (1) and 2. If you have a vehicle with a involved in the jump start negative post (2) are on the battery diesel engine with two procedure. Put the automatic of the vehicle providing the jump batteries, you should know transmission in P (Park) before start. before you begin that, setting the parking brake. If you especially in cold weather, you have a four-wheel-drive may not be able to get enough power from a single battery in GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

422 Vehicle Care vehicle, be sure the transfer The positive (+) terminal is case is in a drive gear, not in under a red plastic cover at the Warning (Continued) N (Neutral). positive battery post. To uncover the positive (+) and some have been blinded. Use a flashlight if you need more Caution terminal, open the red plastic cover. light. If any accessories are left on or For more information on the Battery fluid contains acid that plugged in during the jump location of the remote can burn you. Do not get it on starting procedure, they could be positive (+) and remote you. If you accidentally get it in damaged. The repairs would not negative (−) terminals, see your eyes or on your skin, flush be covered by the vehicle Engine Compartment Overview the place with water and get warranty. Whenever possible, turn 0 332. medical help immediately. off or unplug all accessories on either vehicle when jump starting. { Warning { Warning 4. Turn the ignition off on both An electric fan can start up even when the engine is not running vehicles. Unplug unnecessary Fans or other moving engine and can injure you. Keep hands, accessories plugged into the parts can injure you badly. Keep clothing, and tools away from any accessory power outlets. Turn your hands away from moving underhood electric fan. off the radio and all the lamps parts once the engine is running. that are not needed. This will avoid sparks and help save both batteries. And it could 6. Check that the jumper cables save the radio! { Warning do not have loose or missing insulation. If they do, you could 5. Open the hood on the other Using a match near a battery can get a shock. The vehicles vehicle and locate the cause battery gas to explode. could be damaged too. positive (+) and negative (−) People have been hurt doing this, terminal locations on that (Continued) vehicle. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 423 Before you connect the cables, 8. Do not let the other end touch here are some basic things you metal. Connect it to the Caution should know. Positive (+) will positive (+) terminal of the go to positive (+) or to a remote good battery. Use a remote If the jumper cables are positive (+) terminal if the positive (+) terminal if the connected or removed in the vehicle has one. Negative (−) vehicle has one. wrong order, electrical shorting may occur and damage the will go to a heavy, unpainted 9. Connect one end of the black metal engine part or to a vehicle. The repairs would not be negative (−) cable to the covered by the vehicle warranty. remote negative (−) terminal if negative (−) terminal of the Always connect and remove the the vehicle has one. good battery. Use a remote jumper cables in the correct order, Do not connect positive (+) to negative (−) terminal if the negative (−) or you will get a vehicle has one. making sure that the cables do short that would damage the not touch each other or other Do not let the other end touch metal. battery and maybe other parts anything until the next step. too. And do not connect the negative (−) cable to the 10. Connect the other end of the Jumper Cable Removal negative (−) terminal on the negative (−) cable to the dead battery because this can remote negative (−) terminal to Reverse the sequence exactly when cause sparks. the discharged battery. removing the jumper cables. 7. Connect one end of the red 11. Start the vehicle with the good After starting the disabled vehicle positive (+) cable to the remote battery and run the engine for a and removing the jumper cables, positive (+) terminal of the while. allow it to idle for several minutes. vehicle with the discharged 12. Try to start the vehicle that had battery. the dead battery. If it will not start after a few tries, it probably needs service. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

424 Vehicle Care Towing the Vehicle GM recommends a flatbed to transport a disabled vehicle. Use ramps to help reduce approach Caution angles, if necessary. A towed vehicle should have its drive wheels Incorrectly towing a disabled off the ground. Contact Roadside vehicle may cause damage. The Assistance or a professional towing damage would not be covered by service if the disabled vehicle must the vehicle warranty. Do not lash be towed. or hook to suspension components. Use the proper Front Attachment Points straps around the tires to secure the vehicle. Do not drag a locked 2500/3500 wheel/tire. Use tire skates or dollies under any locked wheel/ The vehicle is equipped with tire while loading the vehicle. Do specific attachment points to be not use a sling type lift to tow the used to pull the vehicle onto a vehicle. This could damage the flatbed car carrier from a flat road surface. Do not use these vehicle. attachment points to pull the vehicle from snow, mud or sand.

Caution Recreational Vehicle 1500 Towing If the vehicle cannot be shifted into Neutral (N), do not use the Recreational vehicle towing means tow eye to tow the vehicle. towing the vehicle behind another Vehicle damage may occur. vehicle, such as a motor home. The two most common types of recreational vehicle towing are GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 425 dinghy and dolly towing. Dinghy . Whether the vehicle is ready to Dinghy Towing towing is towing the vehicle with all be towed. Just as preparing the (Two-Wheel-Drive Vehicles and four wheels on the ground. Dolly vehicle for a long trip, make sure Vehicles with a Single-Speed towing is towing the vehicle with two the vehicle is prepared to be Transfer Case) wheels on the ground and two towed. wheels on a dolly. Follow the tow vehicle Here are some important things to manufacturer’s instructions. consider before recreational vehicle towing: Caution . Before towing the vehicle, become familiar with the local Use of a shield mounted in front laws that apply to recreational of the vehicle grille could restrict vehicle towing. These laws may airflow and cause damage to the vary by region. transmission. The repairs would not be covered by the vehicle . The towing capacity of the warranty. If using a shield, only towing vehicle. Read the tow use one that attaches to the vehicle manufacturer's towing vehicle. recommendations. Caution . How far the vehicle can be towed. Some vehicles have If a vehicle with two-wheel drive restrictions on how far and how or a single-speed transfer case is long the vehicle can be towed. towed with all four wheels on the ground, the drivetrain . Whether the vehicle has the components could be damaged. proper towing equipment. See The repairs would not be covered your dealer or trailering professional for additional advice by the vehicle warranty. and equipment recommendations. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

426 Vehicle Care Two-wheel-drive vehicles and 5. With the engine running, vehicles with a single-speed transfer { Warning release the parking brake and case should not be towed with all verify that the transfer case is four wheels on the ground. Shifting a four-wheel-drive in N (Neutral) by shifting the vehicle's transfer case into transmission to D (Drive) and Dinghy Towing (Vehicles with a N (Neutral) can allow the vehicle then to R (Reverse). There Two-Speed Transfer Case) to move even if the transmission should be no movement while is in P (Park). You or others could shifting the transmission. be injured. Set the parking brake 6. Shift the transmission to and use wheel blocks before D (Drive). shifting the transfer case to N (Neutral). 7. If equipped with an ignition key, turn the ignition to ACC/ ACCESSORY. If equipped with To dinghy tow: Keyless Access, turn the 1. Position the vehicle being engine off. Disregard the Shift towed behind the tow vehicle, to P (Park) DIC message. See facing forward and on a level Ignition Positions (Keyless surface. Access) 0 208 or Ignition Positions (Key Access) 2. Securely attach the vehicle 0 210. Only dinghy tow four-wheel-drive being towed to the tow vehicle. vehicles with a two-speed transfer 3. Start the engine. case that have an N (Neutral) and a { Warning 4 n (Four-Wheel Drive Low) setting. 4. Shift the transfer case to N (Neutral). See “Shifting into To avoid death, serious injury, N (Neutral)” under Four-Wheel or property damage, before Drive 0 227. dinghy towing the vehicle, always disconnect and secure the (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 427 10. Move the steering wheel to 3. Turn on the ignition with the Warning (Continued) make sure the steering column engine off. For vehicles with a is unlocked. key, turn the ignition to ON/ negative battery cable and cover RUN with the engine off. If the the negative battery post and 11. If the vehicle has an ignition key, keep it in the towed vehicle is equipped with cable with a non-conductive Keyless Access, with your foot material. If the battery is left vehicle in ACC/ACCESSORY to prevent the steering column off the brake pedal, press and connected or the battery cable hold ENGINE START/STOP for contacts the post, the Electric from locking. If the vehicle is equipped with Keyless Access, five seconds until the green Parking Brake may activate keep the RKE transmitter light comes on in the button. during towing, which could cause See Ignition Positions (Keyless outside of the vehicle and 0 a crash. manually lock the doors. Access) 208 or Access the vehicle by using Ignition Positions (Key Access) 0 210. 8. Disconnect the negative (–) the key in the door lock. See battery cable. See “Negative Door Locks 0 26. 4. Set the parking brake. See Battery Cable Disconnection Electric Parking Brake 0 233. ” Disconnecting the Towed Vehicle in Battery - North America 5. Disconnect from the tow 0 358. Before disconnecting from the tow vehicle. vehicle: 9. Shift the transmission to 6. Shift the transmission to P (Park). 1. Park on a level surface. Secure N (Neutral). the vehicle with wheel blocks. Caution 2. Re-connect the negative (–) 7. Shift the transfer case to 2 m battery. See Battery - North (Two-Wheel Drive High). When If the steering column is locked, America 0 358. the shift to 2 m (Two-Wheel vehicle damage may occur. Drive High) is complete, the light in the instrument cluster will stop flashing and stay lit. See Four-Wheel-Drive Light 0 141. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

428 Vehicle Care 8. Start the engine. Check that Dolly Towing Caution the vehicle is in 2 m (Two-Wheel Drive High) by Do not tow this vehicle with two starting the engine and shifting wheels on the ground, or vehicle the transmission to D (Drive) damage could occur. This and then to R (Reverse). There damage would not be covered by should be movement of the the vehicle warranty. vehicle while shifting. 9. Shift the transmission to P (Park) and turn off the Dolly towing this vehicle is not ignition. allowed with either the front or the rear tires on the ground for 10. Release the parking brake and two-wheel drive or four-wheel drive, remove the wheel blocks. regardless of transfer case. 11. Reset any lost presets. The outside temperature display will default to 0 °C (32 °F) but will reset with normal usage. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 429

Appearance Care Caution Caution Exterior Care Do not use petroleum-based, Do not power wash any acidic, or abrasive cleaning component under the hood that Locks agents as they can damage the has this e symbol. Locks are lubricated at the factory. vehicle's paint, metal, or plastic Use a de-icing agent only when parts. If damage occurs, it would This could cause damage that absolutely necessary, and have the not be covered by the vehicle would not be covered by the locks greased after using. See warranty. Approved cleaning vehicle warranty. Recommended Fluids and products can be obtained from Lubricants 0 452. your dealer. Follow all Underhood Component Power Washing the Vehicle manufacturer directions regarding Washing correct product usage, necessary If power washing underhood To preserve the vehicle's finish, safety precautions, and wash it often and out of direct components, do not exceed these appropriate disposal of any limits: sunlight. vehicle care product. . Fluid pressures of 110 bar { Warning (1600 psi) . Fluid temperatures of 25°C Do not power wash any part of Caution (77°F) the vehicle’s interior, including the vinyl floor covering. This could Avoid using high-pressure . Nozzle must remain 30 cm damage safety and other systems washes closer than 30 cm (12 in) (12 in) or farther from components. in the vehicle, which would not be to the surface of the vehicle. Use covered by the vehicle warranty. of power washers exceeding 8 274 kPa (1,200 psi) can result in damage or removal of paint and decals. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

430 Vehicle Care Automatic Car Wash must be turned off. Remove any the vehicle as soon as possible. accessories that may be damaged If necessary, use non-abrasive Caution or interfere with the car wash cleaners that are marked safe for equipment. painted surfaces to remove foreign Some automatic car washes can See Power Assist Steps 0 34 for matter. cause damage to the vehicle, cleaning information. Occasional hand waxing or mild wheels and ground effects. Rinse the vehicle well, before polishing should be done to remove Automatic car washes are not residue from the paint finish. See recommended, due to lack of washing and after, to remove all cleaning agents completely. If they your dealer for approved cleaning clearance for the undercarriage are allowed to dry on the surface, products. and/or wide rear tires and wheels. they could stain. Do not apply waxes or polishes to Dry the finish with a soft, clean uncoated plastic, vinyl, rubber, chamois or an all-cotton towel to decals, simulated wood, or flat paint Caution avoid surface scratches and water as damage can occur. spotting. Automatic car washes can cause Caution damage to the vehicle, wheels, Finish Care ground effects, and Application of aftermarket clearcoat Machine compounding or top (if equipped). sealant/wax materials is not aggressive polishing on a basecoat/clearcoat paint finish Do not use automatic car washes recommended. If painted surfaces may damage it. Use only due to lack of clearance for the are damaged, see your dealer to non-abrasive waxes and polishes undercarriage, wide rear tires, have the damage assessed and that are made for a basecoat/ and wheels. repaired. Foreign materials such as calcium chloride and other salts, ice clearcoat paint finish on the melting agents, road oil and tar, tree vehicle. If using an automatic car wash, sap, bird droppings, chemicals from follow with the car wash industrial chimneys, etc., can instructions. The windshield wiper damage the vehicle's finish if they and rear window wiper, if equipped, remain on painted surfaces. Wash GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 431 To keep the paint finish looking new, . Always dilute a concentrated the loose dirt and using a mild keep the vehicle garaged or cleaner according to the detergent. To restore the original covered whenever possible. manufacturer’s instructions. appearance, apply the bedliner . Do not use cleaners that are not conditioner available through your Protecting Exterior Bright Metal dealer. Moldings intended for automotive use. . Use a nonabrasive wax on the CarbonPro Box Care Caution vehicle after washing to protect and extend the molding finish. Caution Failure to clean and protect the bright metal moldings can result Spray-In Bedliner Care To prevent surface damage to the in a hazy white finish or pitting. pickup box, rinse chemical spills This damage would not be Caution quickly, never use alcohol wipes covered by the vehicle warranty. to clean, and avoid scraping the Using silicone-based products surface. may damage the bedliner, reduce The bright metal moldings on the the slip-resistant texture, and vehicle are aluminum, chrome or attract dirt. If equipped with a CarbonPro stainless steel. To prevent damage Pickup Box, use the following always follow these cleaning instructions for cleaning: instructions: A spray-in bedliner is a permanent coating that bonds to the truck bed . Clean the box periodically by . Be sure the molding is cool to and cannot be removed. Promptly washing off the loose dirt with the touch before applying any rinse the bedliner surface following water and a mild detergent. cleaning solution. a chemical spill to avoid permanent . Promptly rinse the bed surface . Use only approved cleaning damage. following a chemical spill to solutions for aluminum, chrome Spray-in bedliners can fade from avoid permanent damage. or stainless steel. Some oxidation, road dirt, heavy-duty . Use a dry rag to remove oil. cleaners are highly acidic or hauling, and hard water stains. contain alkaline substances and Clean it periodically by washing off can damage the moldings. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

432 Vehicle Care Cleaning Exterior Lamps/ . Aftermarket appearance caps or Shutter System Lenses, Emblems, Decals and covers while the lamps are Stripes illuminated, due to excessive heat generated. Use only lukewarm or cold water, a soft cloth, and a car washing soap to clean exterior lamps, lenses, Caution emblems, decals and stripes. Follow Failure to clean lamps properly instructions under "Washing the can cause damage to the lamp Vehicle" previously in this section. cover that would not be covered Lamp covers are made of plastic, by the vehicle warranty. and some have a UV protective coating. Do not clean or wipe them while they are dry. Caution Do not use any of the following on The vehicle may have a shutter lamp covers: Using wax on low gloss black system designed to help increase . Abrasive or caustic agents. finish stripes can increase the fuel economy. Keep the shutter gloss level and create a system clean for proper operation. . Washer fluids and other cleaning agents in higher concentrations non-uniform finish. Clean low Windshield and Wiper Blades than suggested by the gloss stripes with soap and water only. Clean the outside of the windshield manufacturer. with glass cleaner. . Solvents, alcohols, fuels, Air Intakes Clean rubber blades using a lint-free or other harsh cleaners. cloth or paper towel soaked with . Ice scrapers or other hard items. Clear debris from the air intakes, windshield washer fluid or a mild between the hood and windshield, detergent. Wash the windshield when washing the vehicle. thoroughly when cleaning the blades. Bugs, road grime, sap, and GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 433 a buildup of vehicle wash/wax treatments may cause wiper Caution Caution (Continued) streaking. Using petroleum-based tire dust and ice. Always wash the Replace the wiper blades if they are dressing products on the vehicle chrome with soap and water after worn or damaged. Damage can be may damage the paint finish and/ exposure. caused by extreme dusty or tires. When applying a tire conditions, sand, salt, heat, sun, dressing, always wipe off any snow, and ice. overspray from all painted Caution Weatherstrips surfaces on the vehicle. Apply weatherstrip lubricant on To avoid surface damage on weatherstrips to make them last Wheels and Wheel Trim wheels and wheel trim, do not use strong soaps, chemicals, longer, seal better, and not stick or Use a soft, clean cloth with mild abrasive polishes, cleaners, squeak. Lubricate weatherstrips soap and water to clean the wheels. once a year. Hot, dry climates may After rinsing thoroughly with clean or brushes. Use only GM require more frequent application. water, dry with a soft, clean towel. approved cleaners. Do not drive Black marks from rubber material on A wax may then be applied. the vehicle through an automatic painted surfaces can be removed by car wash that uses silicon carbide rubbing with a clean cloth. See Caution tire/wheel cleaning brushes. Recommended Fluids and Damage could occur and the Lubricants 0 452. Chrome wheels and chrome repairs would not be covered by Tires wheel trim may be damaged if the the vehicle warranty. vehicle is not washed after driving Use a stiff brush with tire cleaner to clean the tires. on roads that have been sprayed Brake System with magnesium chloride or calcium chloride. These are used Visually inspect brake lines and on roads for conditions such as hoses for proper hook-up, binding, leaks, cracks, chafing, etc. Inspect (Continued) disc brake pads for wear and rotors GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

434 Vehicle Care for surface condition. Inspect drum Do not directly power wash the brake linings/shoes for wear or Caution transfer case and/or front/rear axle cracks. Inspect all other brake parts. output seals. High pressure water Lubrication of applicable can overcome the seals and Steering, Suspension, and suspension points should not be contaminate the fluid. Contaminated Chassis Components done unless the temperature is fluid will decrease the life of the Visually inspect steering, −12 °C (10 °F) or higher, transfer case and/or axles and suspension, and chassis or damage could result. should be replaced. components for damaged, loose, Sheet Metal Damage or missing parts or signs of wear at Body Component Lubrication least once a year. If the vehicle is damaged and Lubricate all key lock cylinders, requires sheet metal repair or Inspect power steering for proper hood hinges, liftgate hinges, and the replacement, make sure the body attachment, connections, binding, steel fuel door hinge unless the repair shop applies anti-corrosion cracks, chafing, etc. components are plastic. Applying material to parts repaired or Visually check constant velocity joint silicone grease on weatherstrips replaced to restore corrosion boots and axle seals for leaks. with a clean cloth will make them protection. last longer, seal better, and not stick 2500/3500 Series vehicles, at least or squeak. Original manufacturer replacement every engine oil change lubricate parts will provide the corrosion the upper and lower control arm ball Underbody Maintenance protection while maintaining the joints. Control arm ball joints on At least twice a year, spring and fall, vehicle warranty. 1500 series vehicles are use plain water to flush any maintenance-free. Finish Damage corrosive materials from the 2500/3500 Series vehicles equipped underbody. Take care to thoroughly Quickly repair minor chips and with steering linkage, at least every clean any areas where mud and scratches with touch-up materials engine oil change lubricate the tie other debris can collect. If equipped available from your dealer to avoid rod ball joints, idler arm pivot shaft with power assist steps, extend corrosion. Larger areas of finish bearings, idler arm socket, and them and then use a high pressure damage can be corrected in your pitman arm socket. wash to clean all joints and gaps. dealer's body and paint shop. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 435 Chemical Paint Spotting cloth. Do not spray cleaners on any create streaks and attract dirt. switches or controls. Remove Do not use solutions that contain Airborne pollutants can fall upon cleaners quickly. strong or caustic soap. and attack painted vehicle surfaces causing blotchy, ring-shaped Before using cleaners, read and . Do not heavily saturate the discolorations, and small, irregular follow all safety instructions on the upholstery when cleaning. dark spots etched into the paint label. While cleaning the interior, . Do not use solvents or cleaners surface. Refer to “Finish Care” open the doors and windows to get containing solvents. previously in this section. proper ventilation. To prevent damage, do not clean Interior Glass Interior Care the interior using the following To clean, use a terry cloth fabric To prevent dirt particle abrasions, cleaners or techniques: dampened with water. Wipe droplets regularly clean the vehicle's interior. . Never use a razor or any other left behind with a clean dry cloth. Immediately remove any soils. sharp object to remove soil from If necessary, use a commercial Newspapers or dark garments can any interior surface. glass cleaner after cleaning with transfer color to the vehicle s plain water. ’ Never use a brush with stiff interior. . bristles. Use a soft bristle brush to remove Caution . Never rub any surface dust from knobs and crevices on the aggressively or with too much To prevent scratching, never use instrument cluster. Using a mild pressure. abrasive cleaners on automotive soap solution, immediately remove hand lotions, sunscreen, and insect . Do not use laundry detergents or glass. Abrasive cleaners or repellent from all interior surfaces or dishwashing soaps with aggressive cleaning may damage permanent damage may result. degreasers. For liquid cleaners, the rear window defogger. use approximately 20 drops per Use cleaners specifically designed 3.8 L (1 gal) of water. for the surfaces being cleaned to Cleaning the windshield with water A concentrated soap solution will prevent permanent damage. Apply during the first three to six months cleaners directly to the cleaning of ownership will reduce tendency to fog. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

436 Vehicle Care Speaker Covers To clean: If the soil is not completely removed, it may be necessary to Vacuum around a speaker cover 1. Saturate a clean, lint-free use a commercial upholstery gently, so that the speaker will not colorfast cloth with water. cleaner or spot lifter. Test a small be damaged. Clean spots with water Microfiber cloth is hidden area for colorfastness before and mild soap. recommended to prevent lint transfer to the fabric or carpet. using a commercial upholstery Coated Moldings cleaner or spot lifter. If ring 2. Remove excess moisture by formation occurs, clean the entire Coated moldings should be cleaned. gently wringing until water does fabric or carpet. not drip from the cleaning cloth. . When lightly soiled, wipe with a After cleaning use a paper towel to sponge or soft, lint-free cloth 3. Start on the outside edge of the blot excess moisture. dampened with water. soil and gently rub toward the . When heavily soiled, use warm center. Fold the cleaning cloth Cleaning High Gloss Surfaces soapy water. to a clean area frequently to and Vehicle Information and prevent forcing the soil in to the Radio Displays Fabric/Carpet/Suede fabric. Use a microfiber cloth on high gloss Start by vacuuming the surface 4. Continue gently rubbing the surfaces or vehicle displays. First, using a soft brush attachment. If a soiled area until there is no use a soft bristle brush to remove rotating vacuum brush attachment is longer any color transfer from dirt that can scratch the surface. being used, only use it on the floor the soil to the cleaning cloth. Then gently clean by rubbing with a carpet. Before cleaning, gently 5. If the soil is not completely microfiber cloth. Never use window remove as much of the soil as cleaners or solvents. Periodically possible: removed, use a mild soap solution followed only by plain hand wash the microfiber cloth . Gently blot liquids with a paper water. separately, using mild soap. Do not towel. Continue blotting until no use bleach or fabric softener. Rinse more soil can be removed. thoroughly and air dry before next use. . For solid soils, remove as much as possible prior to vacuuming. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Vehicle Care 437

Caution Caution (Continued) Caution (Continued)

Do not attach a device with a Wipe excess moisture from these any plastic or painted surface in suction cup to the display. This surfaces after cleaning and allow the vehicle, blot immediately and may cause damage and would them to dry naturally. Never use clean with a soft cloth dampened not be covered by the vehicle heat, steam, or spot removers. Do with a mild soap solution. warranty. not use cleaners that contain Damage caused by air fresheners silicone or wax-based products. would not be covered by the Instrument Panel, Leather, Cleaners containing these vehicle warranty. Vinyl, Other Plastic Surfaces, solvents can permanently change the appearance and feel of Low Gloss Paint Surfaces and Care of Seat Belts leather or soft trim, and are not Natural Open Pore Wood recommended. Keep belts clean and dry. Surfaces

Use a soft microfiber cloth Do not use cleaners that increase { Warning dampened with water to remove gloss, especially on the instrument Do not bleach or dye seat belt dust and loose dirt. For a more panel. Reflected glare can decrease webbing. It may severely weaken thorough cleaning, use a soft visibility through the windshield the webbing. In a crash, they microfiber cloth dampened with a under certain conditions. mild soap solution. might not be able to provide adequate protection. Clean and Caution Caution rinse seat belt webbing only with Use of air fresheners may cause mild soap and lukewarm water. Soaking or saturating leather, permanent damage to plastics Allow the webbing to dry. especially perforated leather, as and painted surfaces. If an air well as other interior surfaces, freshener comes in contact with may cause permanent damage. (Continued) (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

438 Vehicle Care Floor Mats . Do not use a floor mat if the vehicle is not equipped with a floor mat retainer on the driver { Warning side floor. If a floor mat is the wrong size or . Use the floor mat with the is not properly installed, it can correct side up. Do not turn interfere with the pedals. it over. Interference with the pedals can . Do not place anything on top of cause unintended acceleration the driver side floor mat. and/or increased stopping distance which can cause a crash . Use only a single floor mat on the driver side. and injury. Make sure the floor mat does not interfere with the . Do not place one floor mat on Reinstall by lining up the floor mat pedals. top of another. retainer openings over the carpet retainers and snapping into position. Removing and Replacing the Use the following guidelines for Floor Mats Make sure the floor mat is properly proper floor mat usage: secured in place. Pull up on the rear of the driver side Verify the floor mat does not . The original equipment floor floor mat to unlock each retainer interfere with the pedals. mats were designed for your and remove. vehicle. If the floor mats need replacing, it is recommended that GM certified floor mats be purchased. Non-GM floor mats may not fit properly and may interfere with the pedals. Always check that the floor mats do not interfere with the pedals. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 439 General Information Your dealer recognizes the Service and importance of providing Maintenance This maintenance section applies to competitively priced maintenance vehicles with a gasoline engine. For and repair services. With trained diesel engine vehicles, see technicians, the dealer is the place General Information "Maintenance Schedule" in the for routine maintenance such as oil General Information ...... 439 Duramax diesel supplement. changes and tire rotations and Your vehicle is an important additional maintenance items like Maintenance Schedule investment. This section describes tires, brakes, batteries, and wiper Maintenance Schedule ...... 441 the required maintenance for the blades. Special Application Services vehicle. Follow this schedule to help Special Application protect against major repair Caution Services ...... 448 expenses resulting from neglect or inadequate maintenance. It may Damage caused by improper Additional Maintenance also help to maintain the value of maintenance can lead to costly and Care the vehicle if it is sold. It is the repairs and may not be covered Additional Maintenance responsibility of the owner to have by the vehicle warranty. and Care ...... 449 all required maintenance performed. Maintenance intervals, checks, Your dealer has trained technicians inspections, recommended fluids, Recommended Fluids, and lubricants are important to Lubricants, and Parts who can perform required maintenance using genuine keep the vehicle in good working Recommended Fluids and condition. Lubricants ...... 452 replacement parts. They have Maintenance Replacement up-to-date tools and equipment for Do not have chemical flushes that Parts ...... 454 fast and accurate diagnostics. Many are not approved by GM dealers have extended evening and performed on the vehicle. The Maintenance Records Saturday hours, courtesy use of flushes, solvents, cleaners, Maintenance Records ...... 456 transportation, and online or lubricants that are not scheduling to assist with service needs. (Continued) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

440 Service and Maintenance . Are driven on reasonable road Caution (Continued) surfaces within legal driving { Warning limits. approved by GM could damage Performing maintenance work can the vehicle, requiring expensive . Use the recommended fuel. See be dangerous and can cause repairs that are not covered by Recommended Fuel (Except serious injury. Perform 0 the vehicle warranty. 6.2L V8 Engine) 280 or maintenance work only if the Recommended Fuel (6.2L required information, proper tools, V8 Engine) 0 281. The Tire Rotation and Required and equipment are available. Services are the responsibility of the Refer to the information in the If they are not, see your dealer to vehicle owner. It is recommended to Maintenance Schedule Additional have a trained technician do the have your dealer perform these Required Services - Normal chart. work. See Doing Your Own services every 12 000 km/7,500 mi. The Additional Required Services - Service Work 0 330. Proper vehicle maintenance helps to Severe are for vehicles that are: keep the vehicle in good working . Mainly driven in heavy city traffic condition, improves fuel economy, in hot weather and reduces vehicle emissions. . Mainly driven in hilly or Because of the way people use mountainous terrain vehicles, maintenance needs vary. There may need to be more . Frequently towing a trailer frequent checks and services. The . Used for high speed or Additional Required Services - competitive driving Normal are for vehicles that: . Used for taxi, police, or delivery . Carry passengers and cargo service within recommended limits on the Tire and Loading Information Refer to the information in the label. See Vehicle Load Limits Maintenance Schedule Additional 0 200. Required Services - Severe chart. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 441 Maintenance filter must be changed at least once The filter should be replaced as part a year and the oil life system must of routine scheduled maintenance. Schedule be reset. Your trained dealer Inspect the passenger compartment technician can perform this work. air filter every 36 000 km/ Owner Checks and Services If the engine oil life system is reset 22,500 miles or two years, At Each Fuel Stop accidentally, service the vehicle whichever comes first. Replace if within 5 000 km/3,000 mi since the necessary. More frequent . Check the engine oil level. See last service. Reset the oil life replacement may be needed if the 0 Engine Oil 339. system when the oil is changed. vehicle is driven in areas with heavy 0 Once a Month See Engine Oil Life System 341. traffic, areas with poor air quality, or areas with high dust levels. . Check the tire inflation Engine Air Filter Change Replacement may also be needed if pressures, including the spare. there is a reduction in air flow, 0 When the REPLACE AT NEXT OIL See Tire Pressure 387. CHANGE message displays, the excessive window fogging, or odors. Inspect the tires for wear. See engine air filter should be replaced . Power Take Off (PTO) and Tire Inspection 0 396. at the next engine oil change. When the REPLACE ENGINE AIR FILTER Extended Idle Use . Check the windshield washer fluid level. See Washer Fluid SOON message displays, the When the vehicle is used with the 0 354. engine air filter should be replaced PTO equipment or used in a way at the earliest convenience. Reset that requires extended idle time, Engine Oil Change the engine air filter life system after one hour of use shall be deemed the engine air filter is replaced. See When the CHANGE ENGINE OIL the same as 53 km (33 mi). See Engine Air Filter Life System 0 343. Driver Information Center (DIC) SOON message displays, have the 0 engine oil and filter changed within (Base Level) 147 or Passenger Compartment Air Driver Information Center (DIC) the next 1 000 km/600 mi. If driven Filter 0 under the best conditions, the (Midlevel and Uplevel) 148 for engine oil life system may not The passenger compartment air hourmeter, if equipped. indicate the need for vehicle service filter removes dust, pollen, and for up to a year. The engine oil and other airborne irritants from outside air that is pulled into the vehicle. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

442 Service and Maintenance Air Conditioning Desiccant filter life system. See Engine Air fittings, lubricate the suspension (Replace Every Seven Years) Filter Life System 0 343. If the and steering components every vehicle is not equipped with the other oil change for normal The air conditioning system requires engine air filter life system, usage and every oil change for maintenance every seven years. inspect the engine air cleaner severe usage. This service requires replacement of filter. See Engine Air Cleaner/ . Inspect power steering for the desiccant to help the longevity Filter 0 344. and efficient operation of the air proper attachment, connections, conditioning system. This service . Check engine coolant level. See binding, leaks, cracks, can be complex. See your dealer. Cooling System 0 346. chafing, etc. . Check windshield washer fluid . Visually inspect drive shafts for Tire Rotation and Required 0 Services Every 12 000 km/ level. See Washer Fluid 354. excessive wear, lubricant leaks or damage including: tube dents, 7,500 mi . Check tire inflation pressures, including the spare. See Tire cracks, constant velocity joint or Rotate the tires, if recommended for Pressure 0 387. looseness, the vehicle, and perform the cracked or missing boots, loose following services. See Tire . Inspect tire wear. See Tire or missing boot clamps, center Rotation 0 396. Inspection 0 396. bearing excessive looseness, missing or loose fasteners. . Check engine oil level and oil . Visually check for fluid leaks. life percentage. If needed, . Inspect brake system. See . Check restraint system change engine oil and filter, and Exterior Care 0 429. components. See Safety System reset oil life system. See Engine Check 0 70. 0 . Visually inspect steering, Oil 339 and . Visually inspect fuel system for Engine Oil Life System 0 341. suspension, and chassis components for damage, damage or leaks. . If equipped with the engine air including cracks or tears in the . Visually inspect exhaust system filter life system, check the air rubber boots, loose or missing and nearby heat shields for filter life percentage. parts, or signs of wear at least loose or damaged parts. If necessary, replace the engine once a year. See Exterior Care air filter and reset the engine air 0 429. If equipped with grease GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 443 . Lubricate body components. See . Inspect sunroof track and seal, Exterior Care 0 429. if equipped. See Sunroof 0 50. . Check starter switch. See Starter . Verify spare tire key lock Switch Check 0 363. operation and lubricate as needed. See Tire Changing . Check automatic transmission 0 shift lock control function. See 407. Automatic Transmission Shift . Visually inspect the spare tire to Lock Control Function Check ensure that it is tightly stowed 0 363. under the vehicle. Push, pull, . Check ignition transmission lock. and try to turn the tire. If the See Ignition Transmission Lock spare tire moves, tighten as Check 0 363. necessary. See Tire Changing 0 407. . Check parking brake and automatic transmission park mechanism. See Park Brake and P (Park) Mechanism Check 0 364. . Check accelerator pedal for damage, high effort, or binding. Replace if needed. . Visually inspect gas strut for signs of wear, cracks, or other damage. Check the hold open ability of the strut. If the hold open is low, service the gas strut. See Gas Strut(s) 0 365. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

444 Service and Maintenance Additional Required Services

Maintenance Schedule

Additional Required 12 000 km/7,500 mi 24 000 km/15,000 mi 36 000 km/22,500 mi 48 000 km/30,000 mi 60 000 km/37,500 mi 72 000 km/45,000 mi 84 000 km/52,500 mi 96 000 km/60,000 mi 108 000 km/67,500 mi 120 000 km/75,000 mi 132 000 km/82,500 mi 144 000 km/90,000 mi 156 000 km/97,500 mi 180 000 km/112,500 mi Services - Normal 168 000 km/105,000 mi 192 000 km/120,000 mi 204 000 km/127,500 mi 216 000 km/135,000 mi 228 000 km/142,500 mi 240 000 km/150,000 mi

Rotate tires and perform Required Services. Check engine oil level and oil life percentage. Change engine oil and filter, if needed. Check @@@@@@@@@@@@@@@@@@@@ engine air filter life percentage and status. Change engine air filter, if needed. Replace passenger compartment air filter. (1) @ @ @ @ @ @ If the vehicle is not equipped with the engine air filter life system, replace engine air cleaner @ @ @ filter. (2) Inspect evaporative control system. (3) @ @ @ Replace spark plugs. Inspect spark plug wires. @ (Except 2.7L L4 Turbo Engine) Replace spark plugs. Inspect spark plug wires. @ @ (2.7L L4 Turbo Engine Only) For GVW under 3 900 kg (8,600 lb), change @ transfer case fluid, if equipped with 4WD. (4) For GVW over 3 900 kg (8,600 lb), change @ @ @ transfer case fluid, if equipped with 4WD. (4) Drain and fill engine cooling system. (5) @ Visually inspect accessory drive belts. (6) @ GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 445

Maintenance Schedule

Additional Required 12 000 km/7,500 mi 24 000 km/15,000 mi 36 000 km/22,500 mi 48 000 km/30,000 mi 60 000 km/37,500 mi 72 000 km/45,000 mi 84 000 km/52,500 mi 96 000 km/60,000 mi 108 000 km/67,500 mi 120 000 km/75,000 mi 132 000 km/82,500 mi 144 000 km/90,000 mi 156 000 km/97,500 mi 180 000 km/112,500 mi Services - Normal 168 000 km/105,000 mi 192 000 km/120,000 mi 204 000 km/127,500 mi 216 000 km/135,000 mi 228 000 km/142,500 mi 240 000 km/150,000 mi

Replace brake fluid. (7) Replace windshield wiper blades. (8) @@@@@@@@@@ Replace hood gas struts and tailgate @ @ dampener. (9) Replace air conditioning desiccant. (10)

Footnotes — Maintenance Service location can help you (4) Do not directly power wash the Schedule Additional Required determine when it is the right time to transfer case and/or front/rear axle Services - Normal replace your filter. output seals. High pressure water (1) Or every two years, whichever (2) Or every four years, whichever can overcome the seals and comes first. More frequent comes first. If driving in dusty contaminate the fluid. Contaminated replacement may be needed if the conditions, inspect the filter at each fluid will decrease the life of the vehicle is driven in areas with heavy oil change or more often as needed. transfer case and/or drive axles and traffic, poor air quality, areas with See Engine Air Cleaner/Filter 0 344. should be replaced. high dust levels or are sensitive to (3) Visually check all fuel and vapor (5) Or every five years, whichever environmental allergens. Filter lines and hoses for proper comes first. See Cooling System replacement may also be needed if 0 attachment, connection, routing, and 346. you notice reduced airflow, windows condition. fogging up, or odors. Your local GM GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

446 Service and Maintenance (6) Or every 10 years, whichever comes first. Inspect for fraying, excessive cracking, or damage; replace, if needed. (7) Replace brake fluid every five years. See Brake Fluid 0 357. (8) Or every 12 months, whichever comes first. See Wiper Blade Replacement 0 364. (9) Or every 10 years, whichever comes first. See Gas Strut(s) 0 365. (10) Replace air conditioning desiccant every seven years. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 447

Maintenance Schedule

Additional Required 12 000 km/7,500 mi 24 000 km/15,000 mi 36 000 km/22,500 mi 48 000 km/30,000 mi 60 000 km/37,500 mi 72 000 km/45,000 mi 84 000 km/52,500 mi 96 000 km/60,000 mi 108 000 km/67,500 mi 120 000 km/75,000 mi 132 000 km/82,500 mi 144 000 km/90,000 mi 156 000 km/97,500 mi 180 000 km/112,500 mi Services - Severe 168 000 km/105,000 mi 192 000 km/120,000 mi 204 000 km/127,500 mi 216 000 km/135,000 mi 228 000 km/142,500 mi 240 000 km/150,000 mi

Rotate tires and perform Required Services. Check engine oil level and oil life percentage. Change engine oil and filter, if needed. Check @@@@@@@@@@@@@@@@@@@@ engine air filter life percentage and status. Change engine air filter, if needed. Replace passenger compartment air filter. (1) @ @ @ @ @ @ If the vehicle is not equipped with the engine air filter life system, replace engine air cleaner @ @ @ filter. (2) Inspect evaporative control system. (3) @ @ @ Replace spark plugs. Inspect spark plug wires. @ (Except 2.7L L4 Turbo Engine) Replace spark plugs. Inspect spark plug wires. @ @ (2.7L L4 Turbo Engine Only) Change automatic transmission fluid and filter. @ @ @ For GVW under 3 900 kg (8,600 lb), change @ @ @ transfer case fluid, if equipped with 4WD. (4) For GVW over 3 900 kg (8,600 lb), change @ @ @ @ @ @ transfer case fluid, if equipped with 4WD. (4) Drain and fill engine cooling system. (5) @ Visually inspect accessory drive belts. (6) @ Replace brake fluid. (7) Replace windshield wiper blades. (8) @@@@@@@@@@ Replace hood gas struts and tailgate @ @ dampener. (9) Replace air conditioning desiccant. (10) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

448 Service and Maintenance Footnotes — Maintenance (4) Do not directly power wash the Special Application Schedule Additional Required transfer case and/or front/rear axle Services - Severe output seals. High pressure water Services can overcome the seals and (1) Or every two years, whichever . Vehicles with Dual Wheels: contaminate the fluid. Contaminated comes first. More frequent Check dual wheel nut torque at fluid will decrease the life of the replacement may be needed if the 160, 1 600, and 10 000 km (100, transfer case and/or drive axles and vehicle is driven in areas with heavy 1,000, and 6,000 mi) of driving. should be replaced. traffic, poor air quality, areas with Repeat this service whenever a high dust levels or are sensitive to (5) Or every five years, whichever tire/wheel is serviced or environmental allergens. Filter comes first. See Cooling System removed. replacement may also be needed if 0 346. . Severe Commercial Use you notice reduced airflow, windows (6) Or every 10 years, whichever Vehicles Only: Lubricate chassis fogging up, or odors. Your local GM comes first. Inspect for fraying, components every oil change. Service location can help you excessive cracking, or damage; determine when it is the right time to . Have underbody flushing service replace, if needed. replace your filter. performed. See “Underbody (7) Replace brake fluid every five Maintenance in Exterior Care (2) Or every four years, whichever ” years. See Brake Fluid 0 357. 0 429. comes first. If driving in dusty conditions, inspect the filter at each (8) Or every 12 months, whichever oil change or more often as needed. comes first. See Wiper Blade See Engine Air Cleaner/Filter 0 344. Replacement 0 364. (3) Visually check all fuel and vapor (9) Or every 10 years, whichever lines and hoses for proper comes first. See Gas Strut(s) 0 365. attachment, connection, routing, and (10) Replace air conditioning condition. desiccant every seven years. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 449 Additional . To avoid break-down or failure to . Trained dealer technicians have start the vehicle, maintain a access to tools and equipment Maintenance and Care battery with full cranking power. to inspect the brakes and recommend quality parts Your vehicle is an important . Trained dealer technicians have engineered for the vehicle. investment and caring for it properly the diagnostic equipment to test may help to avoid future costly the battery and ensure that the Fluids repairs. To maintain vehicle connections and cables are Proper fluid levels and approved performance, additional corrosion-free. fluids protect the vehicle s systems maintenance services may be ’ Belts and components. See required. . Belts may need replacing if they Recommended Fluids and It is recommended that your dealer 0 squeak or show signs of Lubricants 452 for GM approved perform these services their — cracking or splitting. fluids. trained dealer technicians know . Engine oil and windshield your vehicle best. Your dealer can . Trained dealer technicians have washer fluid levels should be also perform a thorough access to tools and equipment checked at every fuel fill. assessment with a multi-point to inspect the belts and inspection to recommend when your recommend adjustment or . Instrument cluster lights may vehicle may need attention. replacement when necessary. come on to indicate that fluids may be low and need to be The following list is intended to Brakes filled. explain the services and conditions Brakes stop the vehicle and are to look for that may indicate crucial to safe driving. Hoses services are required. . Signs of brake wear may include Hoses transport fluids and should Battery chirping, grinding, or squealing be regularly inspected to ensure that there are no cracks or leaks. The 12-volt battery supplies power noises, or difficulty stopping. With a multi-point inspection, your to start the engine and operate any dealer can inspect the hoses and additional electrical accessories. advise if replacement is needed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

450 Service and Maintenance Lamps of leaking, blown seals, Vehicle Care Properly working headlamps, or damage, and can advise To help keep the vehicle looking like taillamps, and brake lamps are when service is needed. new, vehicle care products are important to see and be seen on Tires available from your dealer. For the road. information on how to clean and Tires need to be properly inflated, protect the vehicle’s interior and . Signs that the headlamps need rotated, and balanced. Maintaining 0 attention include dimming, failure exterior, see Interior Care 435 and the tires can save money and fuel, Exterior Care 0 429. to light, cracking, or damage. and can reduce the risk of tire The brake lamps need to be failure. Wheel Alignment checked periodically to ensure that they light when braking. . Signs that the tires need to be Wheel alignment is critical for replaced include three or more ensuring that the tires deliver . With a multi-point inspection, visible treadwear indicators; cord optimal wear and performance. your dealer can check the lamps or fabric showing through the and note any concerns. . Signs that the alignment may rubber; cracks or cuts in the need to be adjusted include Shocks and Struts tread or sidewall; or a bulge or pulling, improper vehicle split in the tire. Shocks and struts help aid in control handling, or unusual tire wear. for a smoother ride. . Trained dealer technicians can . Your dealer has the required inspect and recommend the right . Signs of wear may include equipment to ensure proper tires. Your dealer can also wheel alignment. steering wheel vibration, bounce/ provide tire/wheel balancing sway while braking, longer services to ensure smooth Windshield stopping distance, or uneven vehicle operation at all speeds. tire wear. For safety, appearance, and the Your dealer sells and services best viewing, keep the windshield . As part of the multi-point name brand tires. clean and clear. inspection, trained dealer technicians can visually inspect . Signs of damage include the shocks and struts for signs scratches, cracks, and chips. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 451 . Trained dealer technicians can inspect the windshield and recommend proper replacement if needed. Wiper Blades Wiper blades need to be cleaned and kept in good condition to provide a clear view. . Signs of wear include streaking, skipping across the windshield, and worn or split rubber. . Trained dealer technicians can check the wiper blades and replace them when needed. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

452 Service and Maintenance Recommended Fluids, Lubricants, and Parts Recommended Fluids and Lubricants This maintenance section applies to vehicles with a gasoline engine. If the vehicle has a diesel engine, see “Recommended Fluids and Lubricants” in the Duramax diesel supplement. Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer. Usage Fluid/Lubricant Automatic Transmission (6-Speed DEXRON-VI Automatic Transmission Fluid. Transmission) Automatic Transmission (8-Speed DEXRON-HP Automatic Transmission Fluid. Transmission) Automatic Transmission (10-Speed DEXRON ULV Automatic Transmission Fluid. Transmission) Chassis Lubrication Chassis Lubricant (GM Part No. 12377985, in Canada 88901242) or lubricant meeting requirements of NLGI #2, Category LB or GC-LB. Engine Coolant 50/50 mixture of clean, drinkable water and use only DEX-COOL coolant. See Cooling System 0 346. Engine Oil Engine oil meeting the dexos1 specification of the proper SAE viscosity grade. ACDelco dexos1 full synthetic is recommended. See Engine Oil 0 339. Front and Rear Axle Driveshaft Spline Lubricant, Special Lubricant (GM Part No. 19257121, in Splines Canada 19257122). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 453

Usage Fluid/Lubricant Front Axle (Four-Wheel Drive) and See your dealer. Rear Axle Hydraulic Brake System (Vehicles DOT 3 Hydraulic Brake Fluid (GM Part No. 19353126, in with DOT 3 brake fluid) Canada 19353127). See Brake Fluid 0 357. Hydraulic Brake System (Vehicles DOT 4 Hydraulic Brake Fluid (GM Part No. 19299570, in with DOT 4 brake fluid) Canada 19299571). See Brake Fluid 0 357. Hydraulic Power Steering System GM Power Steering Fluid (GM Part No. 19329450, in Canada 19329451). (2500/3500 Series Only) Key Lock Cylinders, Hood Hinges, Multi-Purpose Lubricant, Superlube (GM Part No. 12346241, in Body Door Hinge Pins, Tailgate Canada 10953474). Hinge and Linkage, Fuel Door Hinge, Tailgate Handle Pivot Points, Hinges, Latch Bolt, and Linkage Transfer Case (Four-Wheel Drive) DEXRON-VI Automatic Transmission Fluid. Weatherstrip Conditioning Weatherstrip Lubricant. See your dealer. Weatherstrip Squeaks Synthetic Grease with Teflon, Superlube (GM Part No. 12371287). Windshield Washer Automotive windshield washer fluid that meets regional freeze protection requirements. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

454 Service and Maintenance Maintenance Replacement Parts Replacement parts identified below by name, part number, or specification can be obtained from your dealer. If the vehicle has a diesel engine, see the Duramax diesel supplement. Part GM Part Number ACDelco Part Number Engine Air Cleaner/Filter With high capacity air cleaner 84121219 A3244C Without high capacity air cleaner 84121217 A3246C Oil Filter 2.7L L4 55495106 PF66 4.3L V6 12690385 PF63E 5.3L V8 12690385 PF63E 6.2L V8 12690385 PF63E 6.6L V8 12690385 PF63E Passenger Compartment Air Filter 13508023 CF185 Spark Plugs 2.7L L4 12688094 41-106-IP 4.3L V6 12622441 41-114 5.3L V8 12622441 41-114 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Service and Maintenance 455

Part GM Part Number ACDelco Part Number 6.2L V8 12622441 41-114 6.6L V8 12622441 41-114 Wiper Blades Driver Side – 55 cm (21.7 in) 84578275 — Passenger Side – 55 cm (21.7 in) 84578275 — GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

456 Service and Maintenance Maintenance Records After the scheduled services are performed, record the date, odometer reading, who performed the service, and the type of services performed in the boxes provided. Retain all maintenance receipts. Odometer Date Serviced By Services Performed Reading GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Technical Data 457 Vehicle Identification parts. See “Engine Specifications” Technical Data under Capacities and Specifications 0 Vehicle Identification 458 for the vehicle's engine code. Vehicle Identification Number (VIN) Vehicle Identification Service Parts Number (VIN) ...... 457 Identification Service Parts Identification . . . 457 There may be a large barcode on Vehicle Data the certification label on the center Capacities and pillar that you can scan for the Specifications ...... 458 following information: Engine Drive Belt Routing . . . . 461 . Vehicle Identification This legal identifier is in the front Number (VIN) corner of the instrument panel, on . Model designation the driver side of the vehicle. It can be seen through the windshield from . Paint information outside. The Vehicle Identification . Production options Number (VIN) also appears on the If there is not a large barcode on Vehicle Certification and Service this label, then you will find this Parts labels and certificates of title same information on a label inside and registration. of the glove box. Engine Identification The eighth character in the VIN is the engine code. This code identifies the vehicle's engine, specifications, and replacement GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

458 Technical Data Vehicle Data Capacities and Specifications The following approximate capacities are given in metric and English conversions. See Recommended Fluids and Lubricants 0 452. If the vehicle has a diesel engine, see the Duramax diesel supplement. Capacities Application Metric English Air Conditioning Refrigerant For the air conditioning system refrigerant type and charge amount, see the refrigerant label under the hood. See your dealer for more information. Engine Cooling System* 2.7L L4 Engine – 1500 Series 11.8 L 12.4 qt 4.3L V6 Engine – 1500 Series 11.5 L 12.2 qt 5.3L V8 Engine – 1500 Series (L82) 12.8 L 13.5 qt 5.3L V8 Engine – 1500 Series (L84) 13.1 L 13.8 qt 6.2L V8 Engine – 1500 Series 12.6 L 13.3 qt 6.6L V8 Gas Engine – 2500 Series and 3500 Series (L8T) 15.1 L 15.9 qt Engine Oil with Filter 2.7L L4 Engine – 1500 Series 5.7 L 6.0 qt GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Technical Data 459

Capacities Application Metric English 4.3L V6 Engine – 1500 Series 5.7 L 6.0 qt 5.3L V8 Engine – 1500 Series (L84) 7.6 L 8.0 qt 6.2L V8 Engine – 1500 Series 7.6 L 8.0 qt 6.6L V8 Gas Engine – 2500 Series and 3500 Series 7.6 L 8.0 qt Fuel Tank 1500 Series Standard and Short Box (4WD Gas and 90.8 L 24.0 gal Diesel) 1500 Series Standard and Short Box (2WD Diesel) 83.3 L 22.0 gal 1500 Series Long Box 106.0 L 28.0 gal 2500 Series and 3500 Series Standard Box (Except 136.3 L 36.0 gal Double Cab Diesel) 2500 Series and 3500 Series Standard Box (Double Cab 111.3 L 29.4 gal Diesel) 2500 Series and 3500 Series Long Box (Except Regular 136.3 L 28.0 gal Cab Diesel) 2500 Series and 3500 Series Long Box (Regular Cab 106.0 L 28.0 gal Diesel) 3500 Series Chassis Cab – Front Tank 89.0 L 23.5 gal GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

460 Technical Data

Capacities Application Metric English 3500 Series Chassis Cab – Rear Tank 151.4 L 40.0 gal Transfer Case Fluid (1500 Series Only) 1.5 L 1.6 qt Transfer Case Fluid (2500 and 3500 Series Only) 2.3 L 2.4 qt Wheel Nut Torque 190 Y 140 lb ft All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this manual. Recheck fluid level after filling. *Engine cooling system capacity values are based on the entire cooling system and its components.

Engine Specifications Engine VIN Code Spark Plug Gap 2.7L L4 (L3B) K 0.65–0.75 mm (0.026–0.030 in) 4.3L V6 (LV3) H 0.95–1.10 mm (0.037–0.043 in) 5.3L V8 (L82) F 0.95–1.10 mm (0.037–0.043 in) 5.3L V8 (L84) D 0.95–1.10 mm (0.037–0.043 in) 6.2L V8 (L87) L 0.95–1.10 mm (0.037–0.043 in) 6.6L V8 (L8T) 7 0.95–1.10 mm (0.037–0.043 in) Spark plug gaps are preset by the manufacturer. Re-gapping the spark plug is not recommended and can damage the spark plug. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Technical Data 461 Engine Drive Belt Routing If the vehicle has a diesel engine, see the Duramax diesel supplement.

4.3L, 5.3L, and 6.2L Engines 6.6L Engine (Dual Generator)

2.7L Engine

6.6L Engine (Single Generator) GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

462 Customer Information Reporting Safety Defects Customer Information Customer Reporting Safety Defects to Information the United States Government ...... 472 Customer Satisfaction Reporting Safety Defects to Procedure Customer Information the Canadian Your satisfaction and goodwill are Customer Satisfaction Government ...... 472 important to your dealer and to Procedure ...... 462 Reporting Safety Defects to GMC. Normally, any concerns with General Motors ...... 473 Customer Assistance the sales transaction or the Offices ...... 464 Vehicle Data Recording and operation of the vehicle will be Customer Assistance for Text resolved by your dealer's sales or Telephone (TTY) Users . . . . . 465 Privacy Vehicle Data Recording and service departments. Sometimes, Online Owner Center ...... 465 however, despite the best intentions GM Mobility Reimbursement Privacy ...... 473 Cybersecurity ...... 474 of all concerned, misunderstandings Program ...... 465 can occur. If your concern has not Roadside Assistance Event Data Recorders ...... 474 OnStar ...... 475 been resolved to your satisfaction, Program ...... 466 the following steps should be taken: Scheduling Service Infotainment System ...... 475 Appointments ...... 467 STEP ONE : Discuss your concern Courtesy Transportation with a member of dealership Program ...... 468 management. Normally, concerns Collision Damage Repair . . . . . 469 can be quickly resolved at that level. Publication Ordering If the matter has already been Information ...... 471 reviewed with the sales, service, Radio Frequency or parts manager, contact the owner Statement ...... 472 of your dealership or the general manager. STEP TWO : If after contacting a member of dealership management, it appears your concern cannot be GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Customer Information 463 resolved by your dealership without STEP THREE — U.S. Owners : You may contact the BBB Auto Line further help, in the U.S., call Both General Motors and your Program using the toll-free 1-800-462-8782. In Canada, call dealer are committed to making telephone number or write them at General Motors of Canada sure you are completely satisfied the following address: Customer Care Centre at with your new vehicle. However, BBB Auto Line Program 1-800-263-3777 (English), if you continue to remain unsatisfied BBB National Programs, Inc. or 1-800-263-7854 (French). after following the procedure 3033 Wilson Blvd. We encourage you to call the outlined in Steps One and Two, you Suite 600 toll-free number in order to give your can file with the Better Business Arlington, VA 22201 inquiry prompt attention. Have the Bureau (BBB) Auto Line Program to enforce your rights. Telephone: 1-800-955-5100 following information available to http://www.bbb.org/council/ give the Customer Assistance The BBB Auto Line Program is an programs-services/ representative: out-of-court program administered dispute-handling-and-resolution/ . Vehicle Identification by the BBB National Programs, Inc. bbb-auto-line Number (VIN). This is available to settle automotive disputes regarding vehicle repairs or the This program is available in all from the vehicle registration or 50 states and the District of title, or the plate at the top left of interpretation of the New Vehicle Limited Warranty. Although you may Columbia. Eligibility is limited by the instrument panel and visible vehicle age, mileage, and other through the windshield. be required to resort to this informal dispute resolution program prior to factors. General Motors reserves . Dealership name and location. filing a court action, use of the the right to change eligibility . Vehicle delivery date and program is free of charge and your limitations and/or discontinue its present mileage. case will generally be heard within participation in this program. 40 days. If you do not agree with the When contacting GMC, remember STEP THREE — Canadian decision given in your case, you Owners : In the event that you do that your concern will likely be may reject it and proceed with any resolved at a dealer's facility. That is not feel your concerns have been other venue for relief available addressed after following the why we suggest following Step One to you. first. procedure outlined in Steps One and Two, General Motors of Canada GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

464 Customer Information Company wants you to be aware of Mediation/Arbitration Program www.gmc.com its participation in a no-charge c/o Customer Care Centre 1-800-GMC-8782 (1-800-462-8782) Mediation/Arbitration Program. General Motors of Canada 1-888-889-2438 (For Text General Motors of Canada Company Telephone devices (TTYs)) Company has committed to binding Mail Code: CA1-163-005 Roadside Assistance: arbitration of owner disputes 1908 Colonel Sam Drive 1-888-881-3302 involving factory-related vehicle Oshawa, Ontario L1H 8P7 From U.S. Virgin Islands: service claims. The program Your inquiry should be accompanied provides for the review of the facts by the Vehicle Identification 1-800-496-9994 involved by an impartial third party Number (VIN). arbiter, and may include an informal Canada hearing before the arbiter. The Customer Assistance General Motors of Canada program is designed so that the Company entire dispute settlement process, Offices Customer Care Centre, Mail Code: from the time you file your complaint GMC encourages customers to call CA1-163-005 to the final decision, should be the toll-free number for assistance. 1908 Colonel Sam Drive completed in about 70 days. We However, if a customer wishes to Oshawa, Ontario L1H 8P7 believe our impartial program offers write or e-mail GMC, the letter www.gmc.ca advantages over courts in most should be addressed to: jurisdictions because it is informal, 1-800-263-3777 (English) quick, and free of charge. United States and Puerto Rico 1-800-263-7854 (French) 1-800-263-3830 (For Text For further information concerning GMC Customer Assistance Center Telephone Devices (TTYs)) eligibility in the Canadian Motor P.O. Box 33172 Roadside Assistance: Vehicle Arbitration Plan (CAMVAP), Detroit, MI 48232-5172 1-800-268-6800 call toll-free 1-800-207-0685, or call the General Motors Customer Care Overseas Centre, 1-800-263-3777 (English), Please contact the local General 1-800-263-7854 (French), Motors Business Unit. or write to: GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Customer Information 465 Customer Assistance for G : View maintenance schedules, GMC Owner Centre (Canada) Text Telephone (TTY) alerts, and Vehicle Diagnostic mygmccanada.ca Users Information. Schedule service Visit the GMC Owner Centre at appointments. mygmccanada.ca (English) or To assist customers who are deaf, I : View and print dealer-recorded my.gmccanada.ca (French) to hard of hearing, or speech-impaired service records and self-recorded access similar benefits to the and who use Text Telephones service records. U.S. site. (TTYs), GMC has TTY equipment D : Select a dealer and view available at its Customer Assistance GM Mobility Center. Any TTY user in the U.S. locations, maps, phone numbers, can communicate with GMC by and hours. Reimbursement Program dialing: 1-888-889-2438. TTY users r : Track your vehicle’s warranty in Canada can dial 1-800-263-3830. information. J : View active recalls by Vehicle Online Owner Center Identification Number (VIN). See Online Owner Experience Vehicle Identification Number (VIN) 0 (U.S.) my.gmc.com 457. H The GMC online owner experience : Compare and shop for GMC This program is available to allows access to videos, articles, and OnStar plans and Services. qualified applicants for cost and vehicle health specific to your View GM Card and SiriusXM reimbursement, up to certain limits, GMC as well as your OnStar information (if equipped). of eligible aftermarket adaptive Account information all in one place. F : Chat live with online help equipment required for the vehicle, representatives. such as hand controls or a Membership Benefits wheelchair/scooter lift for the E See my.gmc.com to register your : Download owner’s manuals vehicle. vehicle. and view vehicle-specific how-to To learn about the GM Mobility videos. program, see www.gmmobility.com or call the GM Mobility Assistance GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

466 Customer Information Center at 1-800-323-9935. Text . Location of the vehicle driver if they decide the claims are Telephone (TTY) users, call . Model, year, color, and license made too often, or the same type of 1-800-833-9935. plate number of the vehicle claim is made many times. General Motors of Canada also has . Odometer reading, Vehicle Services Provided a Mobility program. See www.gm.ca Identification Number (VIN), and . Emergency Fuel Delivery: or call 1-800-GM-DRIVE delivery date of the vehicle (800-463-7483) for details. TTY Delivery of enough fuel for the users call 1-800-263-3830. . Description of the problem vehicle to get to the nearest service station. Coverage Roadside Assistance . Lock-Out Service: Service to Program Services are provided for the unlock the vehicle if you are duration of the vehicle's powertrain locked out. A remote unlock may For U.S.-purchased vehicles, call warranty. be available if you have OnStar. 1-888-881-3302; (Text Telephone In the U.S., anyone driving the For security reasons, the driver (TTY): 1-888-889-2438). vehicle is covered. In Canada, a must present identification For Canadian-purchased vehicles, person driving the vehicle without before this service is given. call 1-800-268-6800. permission from the owner is not . Emergency Tow from a Public Service is available 24 hours a day, covered. Road or Highway: Tow to the 365 days a year. Roadside Assistance is not a part of nearest GMC dealer for warranty the New Vehicle Limited Warranty. service, or if the vehicle was in a Calling for Assistance General Motors North America and crash and cannot be driven. When calling Roadside Assistance, GMC reserve the right to make any Assistance is not given when the have the following information changes or discontinue the vehicle is stuck in the sand, ready: Roadside Assistance program at mud, or snow. any time without notification. . Your name, home address, and . Flat Tire Change: Service to home telephone number General Motors North America and change a flat tire with the spare GMC reserve the right to limit tire. The spare tire, if equipped, Telephone number of your . services or payment to an owner or must be in good condition and location properly inflated. It is the owner's GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Customer Information 467 responsibility for the repair or regularly traveled or maintained Assistance advisor may give replacement of the tire if it is not public road, which includes ice and permission to get local covered by the warranty. winter roads. Off-road use is not emergency road service. You will . Battery Jump Start: Service to covered. receive payment, up to $100, jump start a dead battery. after sending the original receipt Services Specific to to Roadside Assistance. . Trip Interruption Benefits and Canadian-Purchased Vehicles Mechanical failures may be Assistance: If your trip is . Fuel Delivery: Reimbursement covered, however any cost for interrupted due to a warranty is up to 7 L. delivery parts and labor for repairs not event, incidental expenses may may be restricted. Propane and covered by the warranty are the be reimbursed within the other fuels are not provided owner’s responsibility. Powertrain warranty period. through this service. Items considered are reasonable Scheduling Service and customary hotel, meals, . Lock-Out Service: Vehicle rental car, or a vehicle being registration is required. Appointments delivered back to the customer, . Trip Interruption Benefits and When the vehicle requires warranty up to 500 miles. Assistance: Must be over service, contact your dealer and Services Not Included in 150 km from where your trip was request an appointment. By started to qualify. scheduling a service appointment Roadside Assistance Pre-authorization, original and advising the service consultant . Impound towing caused by detailed receipts, and a copy of of your transportation needs, your violation of any laws the repair orders are required. dealer can help minimize your inconvenience. . Legal fines Once authorization has been received, the Roadside If the vehicle cannot be scheduled . Mounting, dismounting, Assistance advisor will help to into the service department or changing of snow tires, make arrangements and explain immediately, keep driving it until it chains, or other traction devices how to receive payment. can be scheduled for service, Service is not provided if a vehicle . Alternative Service: If unless, of course, the problem is is in an area that is not accessible assistance cannot be provided to the service vehicle or is not a right away, the Roadside GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

468 Customer Information safety related. If it is, please call entitled “Limited Warranty and amounts should reflect actual costs your dealership, let them know this, Owner Assistance Information” and be supported by original and ask for instructions. furnished with each new vehicle receipts. See your dealer for If your dealer requests you to bring provides detailed warranty coverage information. information. the vehicle for service, you are Courtesy Rental Vehicle urged to do so as early in the work Transportation Options day as possible to allow for For an overnight warranty repair, the same-day repair. Warranty service can generally be dealer may provide an available completed while you wait. However, courtesy rental vehicle or provide for Courtesy Transportation if you are unable to do so, your reimbursement of a rental vehicle. dealer may offer the following Reimbursement is limited and must Program transportation options: be supported by original receipts as well as a signed and completed To enhance your ownership Shuttle Service experience, we and our participating rental agreement and meet state/ dealers are proud to offer Courtesy This includes one-way or round-trip provincial, local, and rental vehicle Transportation, a customer support shuttle service within reasonable provider requirements. program for vehicles with the time and distance parameters of Requirements vary and may include Bumper-to-Bumper (Base Warranty your dealer's area. minimum age requirements, Coverage period in Canada), insurance coverage, credit card, etc. Public Transportation or Fuel Additional fees such as fuel, rental extended powertrain, and/or Reimbursement hybrid-specific warranties in both vehicle insurance, taxes, levies, the U.S. and Canada. If overnight warranty repairs are usage fees, excessive mileage, needed, and public transportation is or rental usage beyond the Several Courtesy Transportation used, the expense must be completion of the repair are also options are available to assist in supported by original receipts and your responsibility. reducing inconvenience when within the maximum amount allowed warranty repairs are required. It may not be possible to provide a by GM. If U.S. customers arrange like vehicle as a courtesy rental. Courtesy Transportation is not a their own transportation, limited part of the New Vehicle Limited reimbursement for reasonable fuel Warranty. A separate manual expenses may be available. Claim GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Customer Information 469 Additional Program Collision Parts Aftermarket collision parts are also available. These are made by Information Genuine GM Collision parts are new companies other than GM and may parts made with the same materials All program options, such as shuttle not have been tested for the vehicle. and construction methods as the service, may not be available at As a result, these parts may fit parts with which the vehicle was every dealer. Contact your dealer poorly, exhibit premature durability/ originally built. Genuine GM for specific availability. corrosion problems, and may not Collision parts are the best choice to General Motors reserves the right to perform properly in subsequent ensure that the vehicle's designed unilaterally modify, change, collisions. Aftermarket parts are not appearance, durability, and safety or discontinue Courtesy covered by the GM New Vehicle are preserved. The use of Genuine Transportation at any time and to Limited Warranty, and any vehicle GM parts can help maintain the GM resolve all questions of claim failure related to such parts is not New Vehicle Limited Warranty. eligibility pursuant to the terms and covered by that warranty. conditions described herein at its Recycled original equipment parts sole discretion. may also be used for repair. These Repair Facility parts are typically removed from GM also recommends that you Collision Damage Repair vehicles that were total losses in choose a collision repair facility that prior crashes. In most cases, the meets your needs before you ever If the vehicle is involved in a parts being recycled are from need collision repairs. Your dealer collision and it is damaged, have the undamaged sections of the vehicle. may have a collision repair center damage repaired by a qualified A recycled original equipment GM with GM-trained technicians and technician using the proper part may be an acceptable choice to state-of-the-art equipment, or be equipment and quality replacement maintain the vehicle's originally able to recommend a collision repair parts. Poorly performed collision designed appearance and safety center that has GM-trained repairs diminish the vehicle resale performance; however, the history of technicians and comparable value, and safety performance can these parts is not known. Such parts equipment. be compromised in subsequent are not covered by the GM New collisions. Vehicle Limited Warranty, and any related failures are not covered by that warranty. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

470 Customer Information Insuring the Vehicle parts. Read the lease carefully, as . Vehicle make, model, and you may be charged at the end of model year Protect your investment in the GM the lease for poor quality repairs. vehicle with comprehensive and . Vehicle Identification collision insurance coverage. There If a Crash Occurs Number (VIN) are significant differences in the If there has been an injury, call . Insurance company and policy quality of coverage afforded by number various insurance policy terms. emergency services for help. Do not Many insurance policies provide leave the scene of a crash until all . General description of the reduced protection to the GM matters have been taken care of. damage to the other vehicle vehicle by limiting compensation for Move the vehicle only if its position puts you in danger, or you are Choose a reputable repair facility damage repairs through the use of that uses quality replacement parts. aftermarket collision parts. Some instructed to move it by a police officer. See “Collision Parts” earlier in this insurance companies will not section. specify aftermarket collision parts. Give only the necessary information When purchasing insurance, we to police and other parties involved If the airbag has inflated, see What recommend that you ensure that the in the crash. Will You See after an Airbag Inflates? 0 76. vehicle will be repaired with GM For emergency towing see original equipment collision parts. Roadside Assistance Program Managing the Vehicle Damage If such insurance coverage is not 0 466. Repair Process available from your current insurance carrier, consider switching Gather the following information: In the event that the vehicle requires damage repairs, GM recommends to another insurance carrier. . Driver name, address, and that you take an active role in its telephone number If the vehicle is leased, the leasing repair. If you have a pre-determined company may require you to have . Driver license number repair facility of choice, take the insurance that ensures repairs with vehicle there, or have it towed there. Genuine GM Original Equipment . Owner name, address, and telephone number Specify to the facility that any Manufacturer (OEM) parts or required replacement collision parts Genuine Manufacturer replacement . Vehicle license plate number be original equipment parts, either new Genuine GM parts or recycled GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Customer Information 471 original GM parts. Remember, Publication Ordering Current and Past Models recycled parts will not be covered by Service manuals and customer the GM vehicle warranty. Information literature are available for many Insurance pays the bill for the repair, Service Manuals current and past model year GM but you must live with the repair. Service manuals have the diagnosis vehicles. Depending on your policy limits, and repair information on the To order, call 1-800-551-4123 your insurance company may engine, transmission, axle, Monday Friday, 8:00 a.m. 6:00 p.m. initially value the repair using – – suspension, brakes, electrical eastern time aftermarket parts. Discuss this with system, steering system, body, etc. the repair professional, and insist on For credit card orders only (VISA, Genuine GM parts. Remember, Customer Literature MasterCard, or Discover), see if the vehicle is leased, you may be Helm, Inc. at: www.helminc.com. Owner’s manuals are written obligated to have the vehicle specifically for owners and are To order by mail, write to: repaired with Genuine GM parts, intended to provide basic Helm, Incorporated even if your insurance coverage operational information about the does not pay the full cost. Attention: Customer Service vehicle. The owner’s manual 47911 Halyard Drive If another party's insurance includes the Maintenance Schedule Plymouth, MI 48170 company is paying for the repairs, for all models. Make checks payable in U.S. funds. you are not obligated to accept a Customer literature publications repair valuation based on that available for purchase include insurance company's collision policy owner’s manuals, warranty repair limits, as you have no manuals, infotainment manuals, and contractual limits with that company. portfolios. Portfolios include an In such cases, you can have control owner’s manual, warranty manual, of the repair and parts choices as infotainment manual, if applicable, long as the cost stays within and zip lock bag or pouch. reasonable limits. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

472 Customer Information Radio Frequency Reporting Safety To contact NHTSA, you may call Statement the Vehicle Safety Hotline Defects toll-free at 1-888-327-4236 This vehicle has systems that (TTY: 1-800-424-9153); go to operate on a radio frequency that Reporting Safety Defects http://www.safercar.gov; or complies with Part 15/Part 18 of the to the United States write to: Federal Communications Commission (FCC) rules and with Government Administrator, NHTSA Innovation, Science and Economic If you believe that your vehicle 1200 New Jersey Avenue, S.E. Development (ISED) Canada's has a defect which could cause Washington, D.C. 20590 RSP-100 / ICES-GEN. a crash or could cause injury or You can also obtain other Operation is subject to the following death, you should immediately information about motor vehicle two conditions: inform the National Highway safety from http:// 1. The device may not cause Traffic Safety Administration www.safercar.gov. harmful interference. (NHTSA) in addition to notifying 2. The device must accept any General Motors. Reporting Safety Defects interference received, including If NHTSA receives similar to the Canadian interference that may cause complaints, it may open an Government undesired operation of the investigation, and if it finds that device. If you live in Canada, and you a safety defect exists in a group believe that the vehicle has a Changes or modifications to any of of vehicles, it may order a recall these systems by other than an safety defect, notify Transport and remedy campaign. Canada immediately, and notify authorized service facility could void However, NHTSA cannot authorization to use this equipment. General Motors of Canada become involved in individual Company. Call Transport problems between you, your Canada at 1-800-333-0510; dealer, or General Motors. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Customer Information 473 go to: In Canada, call 1-800-263-3777 Vehicle Data (English) or 1-800-263-7854 www.tc.gc.ca/recalls (English) (French), or write: Recording and www.tc.gc.ca/rappels (French) General Motors of Canada Privacy or write to: Company The vehicle has a number of Transport Canada Customer Care Centre, Mail Code: CA1-163-005 computers that record information Motor Vehicle Safety Directorate 1908 Colonel Sam Drive about the vehicle’s performance and Defect Investigations and Oshawa, Ontario L1H 8P7 how it is driven or used. For Recalls Division example, the vehicle uses computer 80 Noel Street In Mexico, call 01-800-466-0812 or modules to monitor and control 01-800-466-0801. Gatineau, QC J8Z 0A1 engine and transmission In other Central America and performance, to monitor the Reporting Safety Defects Caribbean Countries, call conditions for airbag deployment 52-55-5-901-23-69. and deploy them in a crash, and, to General Motors if equipped, to provide antilock In addition to notifying NHTSA (or braking to help the driver control the Transport Canada) in a situation like vehicle. These modules may store this, notify General Motors. data to help the dealer technician service the vehicle or to help GM In the U.S., call 1-800-GMC-8782 improve safety or features. Some (1-800-462-8782), or write: modules may also store data about GMC Customer Assistance Center how the vehicle is operated, such as P.O. Box 33172 rate of fuel consumption or average Detroit, MI 48232-5172 speed. These modules may retain personal preferences, such as radio presets, seat positions, and temperature settings. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

474 Customer Information Cybersecurity your vehicle to any unknown or . Whether or not the driver and untrusted networks (such as passenger safety belts were GM collects information about the Bluetooth, WIFI or similar buckled/fastened; use of your vehicle including technology). In the event you . How far (if at all) the driver was operational and safety related suspect any security incident information. We collect this depressing the accelerator and/ impacting your data or the safe or brake pedal; and, information to provide, evaluate, operation of your vehicle, please improve, and troubleshoot our stop operating your vehicle and . How fast the vehicle was products and services and to contact your dealer. traveling. develop new products and services. These data can help provide a The protection of vehicle electronics Event Data Recorders better understanding of the systems and customer data from circumstances in which crashes and unauthorized outside electronic This vehicle is equipped with an injuries occur. access or control is important to event data recorder (EDR). The GM. GM maintains appropriate main purpose of an EDR is to Note security standards, practices, record, in certain crash or near EDR data are recorded by your guidelines and controls aimed at crash-like situations, such as an air vehicle only if a non-trivial crash defending the vehicle and the bag deployment or hitting a road situation occurs; no data are vehicle service ecosystem against obstacle, data that will assist in recorded by the EDR under normal unauthorized electronic access, understanding how a vehicle’s driving conditions and no personal detecting possible malicious activity systems performed. The EDR is data (e.g., name, gender, age, and in related networks, and responding designed to record data related to crash location) are recorded. to suspected cybersecurity incidents vehicle dynamics and safety However, other parties, such as law in a timely, coordinated and effective systems for a short period of time, enforcement, could combine the manner. Security incidents could typically 30 seconds or less. The EDR data with the type of impact your safety or compromise EDR in this vehicle is designed to personally identifying data routinely your private data. To minimize record such data as: acquired during a crash security risks, please do not connect . How various systems in your investigation. your vehicle electronic systems to vehicle were operating; unauthorized devices or connect GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Customer Information 475 To read data recorded by an EDR, OnStar Infotainment System special equipment is required, and access to the vehicle or the EDR is If the vehicle is equipped with If the vehicle is equipped with a needed. In addition to the vehicle OnStar and has an active service navigation system as part of the manufacturer, other parties, such as plan, additional data may be infotainment system, use of the law enforcement, that have the collected and transmitted through system may result in the storage of special equipment, can read the the OnStar system. This includes destinations, addresses, telephone information if they have access to information about the vehicle’s numbers, and other trip information. the vehicle or the EDR. operation; collisions involving the See the infotainment manual for vehicle; the use of the vehicle and information on stored data and for GM will not access these data or its features, including infotainment; deletion instructions. share it with others except: with the and the location and approximate consent of the vehicle owner or, GPS speed of the vehicle. Refer to if the vehicle is leased, with the the OnStar Terms and Conditions consent of the lessee; in response and Privacy Statement on the to an official request by police or OnStar website. similar government office; as part of GM's defense of litigation through See OnStar Additional Information 0 the discovery process; or, as 478. required by law. Data that GM collects or receives may also be used for GM research needs or may be made available to others for research purposes, where a need is shown and the data is not tied to a specific vehicle or vehicle owner. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

476 OnStar OnStar Overview Terms, Privacy Statement, and OnStar Software Terms for more details including system limitations at OnStar Overview www.onstar.com (U.S.) or www.onstar.ca (Canada). OnStar Overview ...... 476 The OnStar system status light is OnStar Services next to the OnStar buttons. If the Emergency ...... 477 status light is: Security ...... 478 = Voice Command Button . Solid Green: System is ready. OnStar Additional Information . Flashing Green: On a call. OnStar Additional Q Blue OnStar Button Information ...... 478 > Red Emergency Button . Red: Indicates a problem. This vehicle may be equipped with a . Off: System is off. Press Q comprehensive, in-vehicle system twice to speak with an OnStar that can connect to an OnStar Advisor. Advisor for Emergency, Security, Navigation, Connections, and Press Q or call 1-888-4ONSTAR Diagnostics Services. OnStar (1-888-466-7827) to speak to an services may require a paid service Advisor. plan and data plan. OnStar requires Functionality of the Voice Command the vehicle battery and electrical button may vary by vehicle and system, cellular service, and GPS region. satellite signals to be available and operating. OnStar acts as a link to existing emergency service providers. OnStar may collect information about you and your vehicle, including location information. See OnStar User GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

OnStar 477 Press = to: Press > to get a priority connection OnStar Services . Open the OnStar app on the to an OnStar Advisor available infotainment display. See the 24/7 to: Emergency infotainment manual for . Get help for an emergency. Emergency Services require an information on how to use the . Be a Good Samaritan or active safety and security plan. With OnStar app. respond to an AMBER Alert. Automatic Crash Response, built-in Or . Get assistance in severe sensors can automatically alert a . Give OnStar Turn-by-Turn weather or other crisis situations specially trained OnStar Advisor Navigation voice commands. and find evacuation routes. who is immediately connected in to the vehicle to help. . Obtain and customize the Wi-Fi hotspot name or SSID and Press > for a priority connection to password, if equipped. an OnStar Advisor who can contact emergency service providers, direct Press Q to connect to an them to your exact location, and Advisor to: relay important information. . Verify account information or With OnStar Crisis Assist, specially update contact information. trained Advisors are available . Get driving directions. 24 hours a day, 7 days a week, to provide a central point of contact, . Receive a Diagnostic check of assistance, and information during a the vehicle's key operating crisis. systems. With Roadside Assistance, Advisors . Receive Roadside Assistance. can locate a nearby service provider . Manage Wi-Fi Settings, to help with a flat tire, a battery if equipped. jump, or an empty gas tank. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

478 OnStar Security OnStar Additional Reactivation for Subsequent Owners If equipped, OnStar provides these Information services: Press Q and follow the prompts to In- Messages . With Stolen Vehicle Assistance, speak to an Advisor as soon as OnStar Advisors can use GPS to Audio messages may play important possible. The Advisor will update pinpoint the vehicle and help information at the following times: vehicle records and explain OnStar or connected service options. authorities quickly recover it. . Prior to vehicle purchase. . With Remote Ignition Block, Press Q to set up an account. How OnStar Service Works if equipped, OnStar can block Automatic Crash Response, the engine from being restarted. . After change in ownership and at 90 days. Emergency Services, Crisis Assist, . With Stolen Vehicle Slowdown, Stolen Vehicle Assistance, Remote if equipped, OnStar can work Transferring Service Services, and Roadside Assistance with law enforcement to Q are available on most vehicles. Not gradually slow the vehicle down. Press to request account transfer all OnStar services are available eligibility information. The Advisor everywhere or on all vehicles. For Theft Alarm Notification can cancel or change account more information, a full description If equipped, if the doors are locked information. of OnStar services, system and the vehicle alarm sounds, a Selling/Transferring the limitations, and OnStar User Terms, notification by text, e-mail, or phone Vehicle Privacy Statement, and Software call will be sent. If the vehicle is Terms: stolen, an OnStar Advisor can work Call 1-888-4ONSTAR (1-888-466-7827) immediately to . Call 1-888-4ONSTAR with authorities to recover the (1-888-466-7827). vehicle. terminate your OnStar or connected services if the vehicle is disposed . See www.onstar.com (U.S.). of, sold, transferred, or if the . See www.onstar.ca (Canada). lease ends. . Call TTY 1-877-248-2080. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

OnStar 479 . Press Q to speak with an to the vehicle in a crash, or wireless access to all OnStar services, Advisor. phone network congestion or except Virtual Advisor and OnStar jamming — may prevent service. Turn-by-Turn Navigation. OnStar or connected services cannot work unless the vehicle is in See Radio Frequency Statement If equipped, TTY mode can be 0 a place where OnStar has an 472. turned on or off by touching agreement with a wireless service Settings, then Apps, and then Services for People with Phone. When TTY mode is on, provider for service in that area. The Disabilities wireless service provider must also phone calls can be made or have coverage, network capacity, Advisors provide services to help received with OnStar using the reception, and technology with physical disabilities and infotainment display. compatible with OnStar or medical conditions. OnStar Personal Identification connected services. Service Q Number (PIN) involving location information about Press to help: the vehicle cannot work unless GPS . Locate a gas station with an A PIN is needed to access some signals are available, unobstructed, attendant to pump gas. OnStar services. The PIN will need and compatible with the OnStar to be changed the first time when . Find a hotel, restaurant, etc., hardware. OnStar or connected speaking with an Advisor. To that meets accessibility needs. services may not work if the OnStar change the OnStar PIN, contact an equipment is not properly installed . Provide directions to the closest OnStar Advisor by pressing Q or or it has not been properly hospital or pharmacy in urgent calling 1-888-4ONSTAR. maintained. If equipment or software situations. is added, connected, or modified, Warranty TTY Users OnStar or connected services may OnStar equipment may be not work. Other problems beyond OnStar has the ability to warranted as part of the vehicle the control of OnStar — such as communicate to deaf, warranty. hills, tall buildings, tunnels, weather, hard-of-hearing, or speech-impaired electrical system design and customers while in the vehicle. The architecture of the vehicle, damage available dealer-installed TTY system can provide in-vehicle GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

480 OnStar Languages call OnStar. However, OnStar may come on. Press Q to try the could have difficulty identifying The vehicle can be programmed to call again or try again after driving a the exact location. respond in multiple languages. few miles into another cellular area. Press Q and ask for an Advisor. . In emergency situations, OnStar Vehicle and Power Issues Advisors are available in English, can use the last stored GPS Spanish, and French. Available location to send to emergency OnStar services require a vehicle languages may vary by country. responders. electrical system, wireless service, and GPS satellite technologies to be A temporary loss of GPS can cause available and operating for features Potential Issues loss of the ability to send a to function properly. These systems OnStar cannot perform Remote Turn-by-Turn Navigation route. The may not operate if the battery is Door Unlock or Stolen Vehicle Advisor may give a verbal route or discharged or disconnected. Assistance after the vehicle has may ask for a call back after the been off continuously for 10 days vehicle is driven into an open area. Add-on Electrical Equipment without an ignition cycle. If the vehicle has not been started for Cellular and GPS Antennas The OnStar system is integrated into the electrical architecture of the 10 days, OnStar can contact Cellular reception is required for vehicle. Do not add any electrical Roadside Assistance or a locksmith OnStar to send remote signals to equipment. See Add-On Electrical to help gain access to the vehicle. the vehicle. Do not place items over Equipment 0 322. Added electrical or near the antenna to prevent equipment may interfere with the Global Positioning blocking cellular and GPS signal operation of the OnStar system and System (GPS) reception. cause it to not operate. . Obstruction of the GPS can Unable to Connect to OnStar occur in a large city with tall Vehicle Software Updates buildings; in parking garages; Message OnStar or GM may remotely deliver around airports; in tunnels and If there is limited cellular coverage software updates or changes to the underpasses; or in an area with or the cellular network has reached vehicle without further notice or very dense trees. If GPS signals maximum capacity, this message consent. These updates or changes are not available, the OnStar may enhance or maintain safety, system should still operate to GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

OnStar 481 security, or the operation of the Privacy libcurl: vehicle or the vehicle systems. The complete OnStar Privacy COPYRIGHT AND PERMISSION Software updates or changes may Statement may be found at NOTICE affect or erase data or settings that www.onstar.com (U.S.), are stored in the vehicle, such as Copyright (c) 1996 - 2010, Daniel or www.onstar.ca (Canada). We saved navigation destinations or Stenberg, . recommend that you review it. If you pre-set radio stations. Neither have any questions, call All rights reserved. OnStar nor GM is responsible for 1-888-4ONSTAR (1-888-466-7827) any affected or erased data or Permission to use, copy, modify, settings. These updates or changes or press Q to speak with an and distribute this software for any may also collect personal Advisor. Users of wireless purpose with or without fee is information. Such collection is communications are cautioned that hereby granted, provided that the described in the OnStar privacy the privacy of any information sent above copyright notice and this statement or separately disclosed at via wireless cellular communications permission notice appear in all the time of installation. These cannot be assured. Third parties copies. updates or changes may also cause may unlawfully intercept or access THE SOFTWARE IS PROVIDED a system to automatically transmissions and private “AS IS,” WITHOUT WARRANTY OF communicate with GM servers to communications without consent. ANY KIND, EXPRESS OR collect information about vehicle OnStar - Software IMPLIED, INCLUDING BUT NOT system status, identify whether Acknowledgements LIMITED TO THE WARRANTIES updates or changes are available, OF MERCHANTABILITY, FITNESS or deliver updates or changes. An Certain OnStar components include FOR A PARTICULAR PURPOSE active OnStar agreement constitutes libcurl and unzip software and other AND NONINFRINGEMENT OF consent to these software updates third party software. Below are the THIRD PARTY RIGHTS. IN NO or changes and agreement that notices and licenses associated with EVENT SHALL THE AUTHORS OR either OnStar or GM may remotely libcurl and unzip and for other third COPYRIGHT HOLDERS BE deliver them to the vehicle. party software please see http:// LIABLE FOR ANY CLAIM, opensource.lge.com/index DAMAGES OR OTHER LIABILITY, www.onstar.com/us/en/ WHETHER IN AN ACTION OF CONTRACT, TORT OR GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

482 OnStar OTHERWISE, ARISING FROM, For the purposes of this copyright Permission is granted to anyone to OUT OF OR IN CONNECTION and license, “Info-ZIP” is defined as use this software for any purpose, WITH THE SOFTWARE OR THE the following set of individuals: including commercial applications, USE OR OTHER DEALINGS IN Mark Adler, John Bush, Karl Davis, and to alter it and redistribute it THE SOFTWARE. Harald Denker, Jean-Michel Dubois, freely, subject to the following Except as contained in this notice, Jean-loup Gailly, Hunter Goatley, Ed restrictions: the name of a copyright holder shall Gordon, Ian Gorman, Chris 1. Redistributions of source code not be used in advertising or Herborth, Dirk Haase, Greg Hartwig, must retain the above copyright otherwise to promote the sale, use Robert Heath, Jonathan Hudson, notice, definition, disclaimer, or other dealings in this Software Paul Kienitz, David Kirschbaum, and this list of conditions. without prior written authorization of Johnny Lee, Onno der Linden, 2. Redistributions in binary form the copyright holder. Igor Mandrichenko, Steve P. Miller, (compiled executables) must Sergio Monesi, Keith Owens, unzip: reproduce the above copyright George Petrov, Greg Roelofs, Kai notice, definition, disclaimer, This is version 2005-Feb-10 of the Uwe Rommel, Steve Salisbury, and this list of conditions in Info-ZIP copyright and license. The Dave Smith, Steven M. Schweda, documentation and/or other definitive version of this document Christian Spieler, Cosmin Truta, materials provided with the should be available at ftp:// Antoine Verheijen, Paul von Behren, distribution. The sole exception ftp.info-zip.org/pub/infozip/ Rich Wales, Mike White. to this condition is redistribution license.html indefinitely. This software is provided “as is,” of a standard UnZipSFX binary Copyright (c) 1990-2005 Info-ZIP. All without warranty of any kind, (including SFXWiz) as part of a rights reserved. express or implied. In no event shall self-extracting archive; that is Info-ZIP or its contributors be held permitted without inclusion of liable for any direct, indirect, this license, as long as the incidental, special or consequential normal SFX banner has not damages arising out of the use of or been removed from the binary inability to use this software. or disabled. GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

OnStar 483 3. Altered versions–including, but 4. Info-ZIP retains the right to use not limited to, ports to new the names “Info-ZIP,”“Zip,” operating systems, existing “UnZip,”“UnZipSFX,”“WiZ,” ports with new graphical “Pocket UnZip,”“Pocket Zip,” interfaces, and dynamic, and “MacZip” for its own shared, or static library source and binary releases. versions–must be plainly marked as such and must not be misrepresented as being the original source. Such altered versions also must not be misrepresented as being Info-ZIP releases–including, but not limited to, labeling of the altered versions with the names “Info-ZIP” (or any variation thereof, including, but not limited to, different capitalizations), “Pocket UnZip,”“WiZ” or “MacZip” without the explicit permission of Info-ZIP. Such altered versions are further prohibited from misrepresentative use of the Zip-Bugs or Info-ZIP e-mail addresses or of the Info-ZIP URL(s). GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

484 Connected Services Connected Connected Services OnStar app on the infotainment display. For other vehicles press = Services Navigation as follows. Navigation requires a specific Cancel Route Connected Services OnStar or connected service plan. 1. Press =. System responds: Navigation ...... 484 Press Q to receive Turn-by-Turn “OnStar ready,” then a tone. Connections ...... 485 Diagnostics ...... 486 directions or have them sent to the 2. Say “Cancel route.” System vehicle’s navigation screen, responds: “Do you want to if equipped. cancel directions?” Turn-by-Turn Navigation 3. Say “Yes.” System responds: “OK, request completed, thank 1. Press Q to connect to an you, goodbye.” Advisor. Route Preview 2. Request directions to be downloaded to the vehicle. 1. Press =. System responds: 3. Follow the voice-guided “OnStar ready,” then a tone. commands. 2. Say “Route preview.” System responds with the next three Using Voice Commands maneuvers. During a Planned Route Repeat Functionality of the Voice Command button, if equipped, may vary by 1. Press =. System responds: vehicle and region. For some “OnStar ready,” then a tone. vehicles, press = to open the GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

Connected Services 485 2. Say “Repeat.” System See www.onstar.com (U.S.) or Wi-Fi Hotspot (If Equipped) responds with the last direction www.onstar.ca (Canada). The vehicle may have a built-in given, then responds with Wi-Fi hotspot that provides access “OnStar ready,” then a tone. Connections to the Internet and web content at Get My Destination The following services help with 4G LTE speed. Up to seven mobile staying connected. devices can be connected. A data 1. Press =. System responds: plan is required. Use the in-vehicle “OnStar ready,” then a tone. For coverage maps, see controls only when it is safe to www.onstar.com (U.S.) or do so. 2. Say “Get my destination.” www.onstar.ca (Canada). System responds with the 1. To retrieve Wi-Fi hotspot address and distance to the Ensuring Security information, press = to open destination, then responds with . Change the default passwords the OnStar app on the “OnStar ready,” then a tone. for the Wi-Fi hotspot and infotainment display, then Send Destination to Vehicle myGMC mobile application. select Wi-Fi Hotspot. On some Make these passwords different vehicles, touch Wi-Fi or Wi-Fi Directions can be sent to the from each other and use a Settings on the screen. vehicle’s navigation screen, combination of letters and 2. The Wi-Fi settings will display if equipped. numbers to increase the the Wi-Fi hotspot name (SSID), security. Press Q, then ask the Advisor to password, and on some download directions to the vehicle’s . Change the default name of the vehicles, the connection type navigation system, if equipped. After SSID (Service Set Identifier). (no Internet connection, 3G, the call ends, the navigation screen This is your network’s name that 4G, 4G LTE), and signal quality will provide prompts to begin driving is visible to other wireless (poor, good, excellent). directions. Routes that are sent to devices. Choose a unique name 3. To change the SSID or the navigation screen can only be and avoid family names or canceled through the navigation vehicle descriptions. password, press Q or call system. 1-888-4ONSTAR to connect with an Advisor. On some GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-13337776) - 2020 - CRC - 8/27/19

486 Connected Services vehicles, the SSID and . Check the vehicle’s fuel level, oil power locks are required. Data rates password can be changed in life, or tire pressure, apply. See www.onstar.com for the Wi-Fi Hotspot menu. if factory-equipped with the Tire details and system limitations. Pressure Monitor System. After initial set-up, your vehicle’s Remote Services Wi-Fi hotspot will connect . Send destinations to the vehicle. automatically to your mobile Contact an OnStar Advisor to . Locate the vehicle on a map unlock the doors or sound the horn devices. Manage data usage by (U.S. market only). turning Wi-Fi on or off on your and flash the lamps. mobile device, using the myGMC . Turn the vehicle's Wi-Fi hotspot Marketplace mobile app, or by contacting an on/off, manage settings, and OnStar Advisor. On some vehicles, monitor data consumption, OnStar Advisors can provide offers Wi-Fi can also be managed from the if equipped. from restaurants and retailers on your route, help locate hotels, Wi-Fi Hotspot menu. . Locate a dealer and schedule or book a room. These services service. MyGMC Mobile App (If Available) vary by market. Download the myGMC mobile app . Request roadside assistance. to compatible Apple and Android . Set a parking reminder with pin Diagnostics smartphones. GMC users can drop, take a photo, make a note, By monitoring and reporting on the access the following services from a and set a timer. vehicle's key systems, OnStar smartphone: . Connect with GMC on social Advanced Diagnostics, if equipped, . Remotely start/stop the vehicle, media. provides a way to keep up on if factory-equipped. maintenance. Capabilities vary by Features are subject to change. For model. See www.onstar.com for . Lock/unlock doors, if equipped myGMC mobile app information and with automatic locks. details and system limitations. compatibility, see my.gmc.com. Features are subject to change. For . Activate the horn and lamps. An active OnStar or connected updates on feature capabilities, see service plan may be required. my.gmc.com. Message and data A compatible device, rates may apply. factory-installed remote start, and GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

Index 487 Index A Airbag System (cont'd) Accessories and What Makes an Airbag Modifications ...... 329 Inflate? ...... 75 Accessory Power ...... 216 What Will You See after an Active Fuel Management ...... 219 Airbag Inflates? ...... 76 Adaptive Cruise Control ...... 245 When Should an Airbag Add-On Electrical Equipment . . . 322 Inflate? ...... 75 Adding a Snow Plow or Where Are the Airbags? ...... 73 Similar Equipment ...... 323 Airbags Additional Information Adding Equipment to the OnStar ...... 478 Vehicle ...... 82 Additional Maintenance Passenger Status Indicator . . . 136 and Care ...... 449 Readiness Light ...... 135 Adjustments Servicing Airbag-Equipped Lumbar, Front Seats ...... 56 Vehicles ...... 82 Air Cleaner/Filter, Engine ...... 344 System Check ...... 71 Air Conditioning ...... 177, 179 Alarm Air Filter Vehicle Security ...... 36 Life System ...... 343 Alert Air Filter, Passenger Lane Change ...... 274 Compartment ...... 183 Side Blind Zone (SBZA) ...... 274 Air Vents ...... 182 All-Season Tires ...... 379 Airbag System All-Terrain Tires ...... 381 Check ...... 83 Antilock Brake System (ABS) . . . 232 How Does an Airbag Warning Light ...... 140 Restrain? ...... 76 Appearance Care Passenger Sensing System . . . .77 Exterior ...... 429 Interior ...... 435 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

488 Index Assistance Program, Battery (cont'd) Bulb Replacement (cont'd) Roadside ...... 466 Power Protection ...... 174 Headlamps, Front Turn Assistance Systems for Battery - North America . . . .358, 419 Signal, Sidemarker, and Driving ...... 268 Blade Replacement, Wiper . . . . . 364 Parking Lamps ...... 367 Assistance Systems for Blind Spot Mirrors ...... 43 License Plate Lamps ...... 369 Parking and Backing ...... 257 Brake Taillamps, Turn Signal, Auto Stop Electric Boost ...... 232 Stoplamps, and Back-up Stop/Start System ...... 213 Parking, Electric ...... 233 Lamps ...... 368 Automatic System Warning Light ...... 139 Buying New Tires ...... 399 Dimming Mirrors ...... 43 Brake Pad Life System ...... 356 C Door Locks ...... 27 Brakes ...... 355 Calibration ...... 120 Emergency Braking (AEB) . . . . 270 Antilock ...... 232 California Headlamp System ...... 168 Assist ...... 234 Perchlorate Materials Transmission ...... 221 Fluid ...... 357 Requirements ...... 329 Transmission Fluid ...... 343 Pad Life System ...... 356 California Automatic Transmission Braking ...... 188 Proposition Manual Mode ...... 224 Automatic 65 Warning ...... 329,358, 419, Shift Lock Control Function Emergency (AEB) ...... 270 Back Cover Check ...... 363 Braking System Canadian Vehicle Owners ...... 2 Axle, Front ...... 361 Front Pedestrian (FPB) ...... 272 Capacities and Axle, Rear ...... 362 Break-In, New Vehicle ...... 208 Specifications ...... 458 Bulb Replacement B Carbon Monoxide Center High-Mounted Battery Engine Exhaust ...... 220 Stoplamp (CHMSL) and Exterior Lighting Battery Tailgate ...... 29 Cargo Lamp ...... 369 Saver ...... 174 Winter Driving ...... 197 Halogen Bulbs ...... 367 Load Management ...... 174 Cargo Headlamp Aiming ...... 366 Tie-Downs ...... 115 Headlamps ...... 367 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

Index 489 Caution, Danger, and Warning . . . . 3 Climate Control Systems (cont'd) Courtesy Transportation Center Console Storage ...... 113 Heating ...... 177 Program ...... 468 Center High-Mounted Clock ...... 120 Cruise Control ...... 243 Stoplamp (CHMSL) and Cluster, Instrument ...... 126 Light ...... 146 Cargo Lamp ...... 369 Collision Damage Repair ...... 469 Cruise Control, Adaptive ...... 245 Center Seat ...... 55 Compartments Cupholders ...... 112 Chains, Tire ...... 404 Storage ...... 112 Customer Assistance ...... 465 Charging Compass ...... 120 Offices ...... 464 Wireless ...... 122 Connected Services Text Telephone (TTY) Charging System Light ...... 137 Connections ...... 485 Users ...... 465 Check Diagnostics ...... 486 Customer Information Engine Light (Malfunction Navigation ...... 484 Publications Ordering Indicator) ...... 137 Connections Information ...... 471 Ignition Transmission Lock . . . 363 Connected Services ...... 485 Customer Satisfaction Child Restraints Control Procedure ...... 462 Infants and Young Children . . . . .86 Hill Descent ...... 237 Cybersecurity ...... 474 Traction and Electronic Lower Anchors and Tethers D for Children ...... 91 Stability ...... 235 Damage Repair, Collision ...... 469 Older Children ...... 84 Control Light Danger, Warning, and Caution . . . . 3 Securing ...... 104, 107, 108 Hill Descent ...... 141 Data Collection Systems ...... 88 Control of a Vehicle ...... 188 Infotainment System ...... 475 Circuit Breakers ...... 370 Convex Mirrors ...... 39 OnStar ...... 475 Cleaning Coolant Data Recorders, Event ...... 474 Exterior Care ...... 429 Engine Temperature Gauge . . 133 Daytime Running Interior Care ...... 435 Engine Temperature Lamps (DRL) ...... 168 Climate Control Systems ...... 177 Warning Light ...... 144 Defensive Driving ...... 187 Air Conditioning ...... 177 Cooling ...... 177, 179 Delayed Locking ...... 27 Dual Automatic ...... 179 Cooling System ...... 346 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

490 Index Diagnostics Driving (cont'd) Engine (cont'd) Connected Services ...... 486 Vehicle Load Limits ...... 200 Check Light (Malfunction Differential, Limited-Slip ...... 242 Wet Roads ...... 196 Indicator) ...... 137 Distracted Driving ...... 187 Winter ...... 197 Compartment Overview ...... 332 Dome Lamps ...... 172 Dual Automatic Climate Coolant Temperature Door Control System ...... 179 Gauge ...... 133 Ajar Light ...... 147 E Coolant Temperature Delayed Locking ...... 27 Warning Light ...... 144 E85 or FlexFuel ...... 282 Locks ...... 26 Cooling System ...... 346 Electric Brake Boost ...... 232 Power Locks ...... 27 Drive Belt Routing ...... 461 Electric Parking Brake ...... 233 Drive Belt Routing, Engine ...... 461 Exhaust ...... 220 Electric Parking Brake Light . . . . 140 Driver Assistance Systems . . . . . 255 Fan ...... 353 Electrical Equipment, Driver Information Heater ...... 215 Add-On ...... 322 Center (DIC) ...... 147, 148 Oil Life System ...... 341 Electrical System Driver Mode Control ...... 238 Oil Pressure Gauge ...... 132 Engine Compartment Fuse Driver Mode Control Light ...... 144 Oil Pressure Light ...... 145 Block ...... 371 Driving Overheated Protection Fuses and Circuit Breakers . . . 370 Assistance Systems ...... 268 Operating Mode ...... 352 Instrument Panel Fuse Better Fuel Economy ...... 186 Overheating ...... 351 Block ...... 374, 376 Characteristics and Power Messages ...... 155 Overload ...... 370 Towing Tips ...... 287 Running While Parked ...... 220 Electronic Stability Control Defensive ...... 187 Starting ...... 212 (ESC) Off Light ...... 143 Drunk ...... 188 Engine Air Filter Life System . . . . 343 Emergency Hill and Mountain Roads ...... 197 Entry Lighting ...... 173 OnStar ...... 477 If the Vehicle is Stuck ...... 199 Equipment, Towing ...... 296 Engine Loss of Control ...... 190 Event Data Recorders ...... 474 Air Cleaner/Filter ...... 344 Off-Road ...... 191 Exit Lighting ...... 173 Off-Road Recovery ...... 190 Extended Parking ...... 219 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

Index 491 Extender, Seat Belt ...... 70 Folding Mirrors ...... 42 Full-Size Spare Tire ...... 418 Exterior Cargo Lamps ...... 171 Forward Collision Alert Fuses Exterior Lamp Controls ...... 165 (FCA) System ...... 268 Engine Compartment Fuse Exterior Lamps Off Reminder . . . 167 Four-Wheel Drive ...... 227, 361 Block ...... 371 Exterior Lighting Battery Four-Wheel-Drive Light ...... 141 Fuses and Circuit Breakers . . . 370 Saver ...... 174 Frequency Statement Instrument Panel Fuse F Radio ...... 472 Block ...... 374, 376 Front Axle ...... 361 Fan G Front Fog Lamp Engine ...... 353 Garage Door Opener ...... 161 Light ...... 146 Filter, Programming ...... 161 Front Pedestrian Braking Engine Air Cleaner ...... 344 Gas Strut(s) ...... 365 (FPB) System ...... 272 Flash-to-Pass ...... 168 Gauges Front Seats Flashers, Hazard Warning ...... 169 Engine Coolant Adjustment ...... 54 Flat Tire ...... 405 Temperature ...... 133 Heated and Ventilated ...... 60 Changing ...... 407 Engine Oil Pressure ...... 132 Fuel FlexFuel Fuel ...... 131 Additives ...... 282 E85 ...... 282 Odometer ...... 131 Economy, Driving for Better . . . 186 Floor Console Storage ...... 114 Speedometer ...... 130 Filling a Portable Fuel Floor Mats ...... 438 Tachometer ...... 131 Container ...... 286 Fluid Trip Odometer ...... 131 Filling the Tank ...... 283, 285 Automatic Transmission ...... 343 Voltmeter ...... 134 Foreign Countries ...... 281 Brakes ...... 357 Warning Lights and Gauge ...... 131 Four-Wheel Drive Indicators ...... 125 Low Fuel Warning Light ...... 145 Transfer Case ...... 227 General Information Management, Active ...... 219 Power Steering ...... 354 Service and Maintenance . . . . . 439 Prohibited Fuels ...... 281 Washer ...... 354 Towing ...... 287 Recommended ...... 280, 281 Fog Lamps ...... 170 Vehicle Care ...... 328 Top Tier ...... 280 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

492 Index Glove Box ...... 112 Heater Infotainment System ...... 475 GM Mobility Reimbursement Engine ...... 215 Instrument Cluster ...... 126 Program ...... 465 Heating ...... 177, 179 Instrument Panel Overview ...... 5 H High-Beam On Light ...... 146 Interior Rearview Mirrors ...... 44 High-Speed Operation ...... 389 Introduction ...... 2 Halogen Bulbs ...... 367 Hill and Mountain Roads ...... 197 Hazard Warning Flashers ...... 169 J Hill Descent Control (HDC) . . . . . 237 Head Restraints ...... 53 Jump Starting - North Hill Descent Control Light ...... 141 Head-up Display ...... 152 America ...... 419 Hill Start Assist (HSA) ...... 235 Headlamps Hood ...... 330 K Aiming ...... 366 Horn ...... 119 Keyless Entry Automatic ...... 168 How to Wear Seat Belts Remote (RKE) System . . . . . 13, 16 Bulb Replacement ...... 367 Properly ...... 65 Keys ...... 9, 12 Daytime Running HVAC ...... 177, 179 Lamps (DRL) ...... 168 L Flash-to-Pass ...... 168 I Labeling, Tire Sidewall ...... 381 Headlamps, Front Turn Ignition Positions ...... 208, 210 Lamps Signal, Sidemarker, and Ignition Transmission Lock Daytime Running (DRL) ...... 168 Parking Lamps ...... 367 Check ...... 363 Dome ...... 172 High-Beam On Light ...... 146 Immobilizer ...... 37 Exterior Cargo ...... 171 High/Low Beam Changer . . . . . 167 Indicator Exterior Controls ...... 165 Lamps On Reminder ...... 146 Pedestrian Ahead ...... 142 Exterior Lamps Off Heated Vehicle Ahead ...... 142 Reminder ...... 167 Rear Seats ...... 63 Infants and Young Children, Exterior Lighting Battery Steering Wheel ...... 119 Restraints ...... 86 Saver ...... 174 Heated and Ventilated Front Information License Plate ...... 369 Seats ...... 60 Publication Ordering ...... 471 Malfunction Indicator Heated Mirrors ...... 43 Infotainment ...... 176 (Check Engine) ...... 137 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

Index 493 Lamps (cont'd) Lights (cont'd) Lights (cont'd) On Reminder ...... 146 Charging System ...... 137 Traction Off ...... 142 Reading ...... 173 Check Engine (Malfunction Limited-Slip Differential ...... 242 Lane Change Alert (LCA) ...... 274 Indicator) ...... 137 Lock Lane Departure Cruise Control ...... 146 Steering Column ...... 37 Warning (LDW) ...... 276 Door Ajar ...... 147 Locking Rear Axle ...... 242 Lane Departure Warning Driver Mode Control ...... 144 Locks Light ...... 141 Electric Parking Brake ...... 140 Automatic Door ...... 27 Lane Keep Assist (LKA) ...... 278 Electronic Stability Control Delayed Locking ...... 27 Lane Keep Assist Light ...... 142 (ESC), Off ...... 143 Door ...... 26 Lap-Shoulder Belt ...... 67 Engine Coolant Lockout Protection ...... 28 LATCH System Temperature Warning ...... 144 Power Door ...... 27 Replacing Parts after a Engine Oil Pressure ...... 145 Safety ...... 28 Crash ...... 104 Flash-to-Pass ...... 168 Loss of Control ...... 190 LATCH, Lower Anchors and Four-Wheel-Drive ...... 141 Low Fuel Warning Light ...... 145 Tethers for Children ...... 91 Front Fog Lamp ...... 146 Low-Profile Tires ...... 380 LED Lighting ...... 367 High-Beam On ...... 146 Lower Anchors and Tethers Lighting High/Low Beam Changer . . . . . 167 for Children (LATCH Entry ...... 173 Hill Descent Control ...... 141 System) ...... 91 Exit ...... 173 Lane Departure Warning ...... 141 Lumbar Adjustment ...... 56 Illumination Control ...... 172 Lane Keep Assist ...... 142 Front Seats ...... 56 LED ...... 367 Low Fuel Warning ...... 145 M Task ...... 171 Seat Belt Reminders ...... 135 Maintenance Lights Security ...... 146 Records ...... 456 Airbag Readiness ...... 135 Service Electric Parking Maintenance and Care Antilock Brake System Brake ...... 140 Additional ...... 449 (ABS) Warning ...... 140 Tire Pressure ...... 144 Maintenance Schedule ...... 441 Brake System Warning ...... 139 Tow/Haul Mode ...... 141 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

494 Index Maintenance Schedule (cont'd) Mirrors, Interior Rearview ...... 44 OnStar Overview ...... 476 Recommended Fluids and Mode ...... 238 OnStar Security ...... 478 Lubricants ...... 452 Driver Control ...... 238 Operating Mode Transfer Case ...... 227 Monitor System, Tire Overheated Engine Malfunction Indicator Lamp . . . . . 137 Pressure ...... 389 Protection ...... 352 Manual Mirrors ...... 39 N Operation Manual Mode ...... 224 Fog Lamps ...... 170 Navigation Manual Windows ...... 47 Outlets Connected Services ...... 484 Memory Seats ...... 58 Power ...... 121 New Vehicle Break-In ...... 208 Messages Overheated Engine Noise Control System ...... 362 Engine Power ...... 155 Protection Operating Mode . . . . 352 Vehicle ...... 155 O Overheating, Engine ...... 351 Vehicle Speed ...... 156 Odometer ...... 131 Overview Mirror Trip ...... 131 Instrument Panel ...... 5 Rear Camera ...... 45 Off-Road ...... 191 P Mirrors Driving ...... 191 Park Automatic Dimming ...... 43 Recovery ...... 190 Shifting Out of ...... 218 Automatic Dimming Oil Park Assist ...... 257 Rearview ...... 44 Engine ...... 339 Parking Blind Spot ...... 43 Engine Oil Life System ...... 341 Brake and P (Park) Convex ...... 39 Engine Oil Pressure Gauge . . . 132 Mechanism Check ...... 364 Folding ...... 42 Pressure Light ...... 145 Extended ...... 219 Heated ...... 43 Older Children, Restraints ...... 84 Over Things That Burn ...... 219 Manual ...... 39 Online Owner Center ...... 465 Parking or Backing Manual Rearview ...... 44 OnStar ...... 475 Assistance Systems ...... 257 Power ...... 41 OnStar Additional Passenger Airbag Status Tilt in Reverse ...... 44 Information ...... 478 Indicator ...... 136 Trailer Tow ...... 40 OnStar Emergency ...... 477 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

Index 495 Passenger Compartment Air Proposition Recreational Vehicle Towing . . . . 424 Filter ...... 183 65 Warning, Reimbursement Program, Passenger Sensing System . . . . . 77 California ...... 329,358, 419, GM Mobility ...... 465 Pedestrian Ahead Indicator . . . . . 142 Back Cover Remote Keyless Entry Perchlorate Materials Publication Ordering (RKE) System ...... 13, 16 Requirements, California ...... 329 Information ...... 471 Remote Vehicle Start ...... 25 Personalization R Replacement Parts Vehicle ...... 156 Airbags ...... 83 Radio Frequency Statement . . . . 472 Pickup Conversion to Maintenance ...... 454 Reading Lamps ...... 173 Chassis Cab ...... 326 Replacing Airbag System ...... 83 Rear Axle ...... 362 Power Replacing LATCH System Locking ...... 242 Door Locks ...... 27 Parts after a Crash ...... 104 Rear Camera Mirror ...... 45 Mirrors ...... 41 Replacing Seat Belt System Rear Seats ...... 62 Outlets ...... 121 Parts after a Crash ...... 71 Heated ...... 63 Protection, Battery ...... 174 Reporting Safety Defects Rear Storage ...... 113 Retained Accessory (RAP) . . . 216 Canadian Government ...... 472 Rear Vision Camera (RVC) . . . . . 257 Seat Adjustment ...... 55 General Motors ...... 473 Rear Windows ...... 49 Steering Fluid ...... 354 U.S. Government ...... 472 Rearview Mirrors ...... 44 Windows ...... 47 Restraints Automatic Dimming ...... 44 Power Assist Steps ...... 34 Where to Put ...... 90 Reclining Seatbacks ...... 56 Pregnancy, Using Seat Belts . . . . 69 Retained Accessory Recommended Privacy Power (RAP) ...... 216 Fuel ...... 280, 281 Vehicle Data Recording ...... 473 Reverse Tilt Mirrors ...... 44 Recommended Fluids and Program Ride Control Systems Lubricants ...... 452 Courtesy Transportation ...... 468 Enhanced Traction Records Prohibited Fuels ...... 281 System (ETS) ...... 242 Maintenance ...... 456 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

496 Index Roads Seats Service (cont'd) Driving, Wet ...... 196 Adjustment, Front ...... 54 Scheduling Appointments . . . . . 467 Roadside Assistance Center Seat ...... 55 Service Electric Parking Program ...... 466 Head Restraints ...... 53 Brake Light ...... 140 Roof Heated and Ventilated Front . . . .60 Services Sunroof ...... 50 Heated, Rear ...... 63 Special Application ...... 448 Rotation, Tires ...... 396 Lumbar Adjustment, Front ...... 56 Servicing the Airbag ...... 82 Routing, Engine Drive Belt ...... 461 Memory ...... 58 Shift Lock Control Function Running the Vehicle While Power Adjustment, Front ...... 55 Check, Automatic Parked ...... 220 Rear ...... 62 Transmission ...... 363 Shifting S Reclining Seatbacks ...... 56 Underseat Storage ...... 113 Into Park ...... 217 Safety Defects Reporting Securing Child Out of Park ...... 218 Canadian Government ...... 472 Restraints ...... 104, 107, 108 Side Blind Zone Alert (SBZA) . . . 274 General Motors ...... 473 Security Signals, Turn and U.S. Government ...... 472 Light ...... 146 Lane-Change ...... 170 Safety Locks ...... 28 OnStar ...... 478 Snow Plow ...... 323 Safety System Check ...... 70 Vehicle ...... 36 Special Application Services . . . . 448 Scheduling Appointments ...... 467 Vehicle Alarm ...... 36 Specifications and Seat Belts ...... 64 Service ...... 184 Capacities ...... 458 Care ...... 70 Accessories and Speedometer ...... 130 Extender ...... 70 Modifications ...... 329 Start Assist, Hill ...... 235 How to Wear Seat Belts Climate Control System ...... 177 Start Vehicle, Remote ...... 25 Properly ...... 65 Doing Your Own Work ...... 330 Starter Switch Check ...... 363 Lap-Shoulder Belt ...... 67 Maintenance Records ...... 456 Starting the Engine ...... 212 Reminders ...... 135 Maintenance, General Steering ...... 188 Replacing after a Crash ...... 71 Information ...... 439 Fluid, Power ...... 354 Use During Pregnancy ...... 69 Parts Identification ...... 457 Heated Wheel ...... 119 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

Index 497 Steering (cont'd) System (cont'd) Tires (cont'd) Wheel Adjustment ...... 118 Infotainment ...... 176, 475 Pressure ...... 387, 389 Wheel Controls ...... 119 Noise Control ...... 362 Pressure Light ...... 144 Steering Column Lock ...... 37 Systems Pressure Monitor Operation . . 390 Steps Driver Assistance ...... 255 Pressure Monitor System . . . . . 389 Power Assist ...... 34 T Rotation ...... 396 Stop/Start System ...... 213 Sidewall Labeling ...... 381 Tachometer ...... 131 Stoplamps and Back-up Lamps Terminology and Definitions . . 385 Tailgate ...... 29 Bulb Replacement ...... 368 Uniform Tire Quality Taillamps Storage Grading ...... 402 Bulb Replacement ...... 368 Rear ...... 113 Wheel Alignment and Tire Task Lighting ...... 171 Storage Areas Balance ...... 403 Text Telephone (TTY) Users . . . . 465 Center Console ...... 113 Wheel Replacement ...... 403 Theft-Deterrent Systems ...... 37 Floor Console ...... 114 When It Is Time for New Immobilizer ...... 37 Glove Box ...... 112 Tires ...... 399 Time ...... 120 Underseat ...... 113 Winter ...... 380 Tires ...... 379 Storage Compartments ...... 112 Top Tier Fuel ...... 280 All-Season ...... 379 Struts Tow/Haul Mode ...... 227 All-Terrain ...... 381 Gas ...... 365 Tow/Haul Mode Light ...... 141 Buying New Tires ...... 399 Stuck Vehicle ...... 199 Towing Chains ...... 404 Sun Visors ...... 50 Driving Characteristics ...... 287 Changing ...... 407 Sunroof ...... 50 Equipment ...... 296 Designations ...... 383 Symbols ...... 3 General Information ...... 287 Different Size ...... 401 System Recreational Vehicle ...... 424 Full-Size Spare ...... 418 Brake Pad Life ...... 356 Trailer ...... 292 If a Tire Goes Flat ...... 405 Engine Air Filter Life ...... 343 Trailer Sway Control (TSC) . . . 308 Inspection ...... 396 Forward Collision Vehicle ...... 424 Low Profile ...... 380 Alert (FCA) ...... 268 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

498 Index Traction U Ventilation, Air ...... 182 Limited-Slip Differential ...... 242 Underseat Storage ...... 113 Visors ...... 50 Off Light ...... 142 Uniform Tire Quality Grading . . . 402 Voltmeter Gauge ...... 134 Traction Control/Electronic Universal Remote System ...... 161 W Stability Control ...... 235 Operation ...... 164 Warning Trailer Programming ...... 161 Brake System Light ...... 139 Sway Control (TSC) ...... 308 Using This Manual ...... 2 Caution and Danger ...... 3 Tow Mirrors ...... 40 V Lane Departure (LDW) ...... 276 Towing ...... 292 Vehicle Warning Lights, Gauges, and Trailer Towing Alarm System ...... 36 Indicators ...... 125 App ...... 310 Canadian Owners ...... 2 Warnings Trailering App ...... 310 Control ...... 188 Hazard Flashers ...... 169 Transfer Case ...... 227 Identification Number (VIN) . . . 457 Washer Fluid ...... 354 Transmission Load Limits ...... 200 Wheels Automatic ...... 221 Messages ...... 155 Alignment and Tire Balance . . 403 Fluid, Automatic ...... 343 Personalization ...... 156 Different Size ...... 401 Transportation Program, Remote Start ...... 25 Replacement ...... 403 Courtesy ...... 468 Security ...... 36 When It Is Time for New Trip Odometer ...... 131 Speed Messages ...... 156 Tires ...... 399 Truck-Camper Loading Towing ...... 424 Where to Put the Restraint ...... 90 Information ...... 206 Vehicle Ahead Indicator ...... 142 Windows ...... 47 Turn and Lane-Change Vehicle Care Manual ...... 47 Signals ...... 170 Tire Pressure ...... 387 Power ...... 47 Turn Signal Vehicle Data Recording and Rear ...... 49 Bulb Replacement ...... 368 Privacy ...... 473 Windshield Vehicle Security Replacement ...... 365 Steering Column Lock ...... 37 Wiper/Washer ...... 119 GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/- Mexico-13337776) - 2020 - CRC - 8/27/19

Index 499 Winter Driving ...... 197 Winter Tires ...... 380 Wiper Blade Replacement ...... 364 Wireless Charging ...... 122 20_GMC_Sierra_SierraDenali_COV_en_US_84186890B_2019AUG27.ai 1 8/12/2019 1:26:17 PM

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