2020 6.6L Duramax Diesel Engine Supplement

20_MUL_6.6L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458631A_2019APR11.ai 1 3/21/2019 11:06:49 AM

MY 6.6L Duramax Diesel

CY CMY Engine Supplement K

84458631 A Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Contents Introduction ...... 2 Instruments and Controls ...... 5 Driving and Operating ...... 15 Vehicle Care ...... 60 Service and Maintenance ...... 79 Technical Data ...... 88 Index ...... 92 Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

2 Introduction Introduction model variants, country Canadian Vehicle Owners specifications, features/applications The names, logos, emblems, that may not be available in your A French language manual can be slogans, vehicle model names, and region, or changes subsequent to obtained from your dealer, at vehicle body designs appearing in the printing of this owner’s manual. www.helminc.com, or from: this manual including, but not limited Refer to the purchase Propriétaires Canadiens to, GM, the GM logo, CHEVROLET, documentation relating to your GMC, the CHEVROLET and GMC On peut obtenir un exemplaire de specific vehicle to confirm the Truck Emblems, SILVERADO, ce guide en français auprès du features. SIERRA, DENALI, and Duramax are concessionnaire ou à l'adresse trademarks and/or service marks of This manual contains information suivante: General Motors LLC, its that pertains to the operation of your Helm, Incorporated subsidiaries, affiliates, or licensors. diesel engine. It also contains your Attention: Customer Service Diesel Maintenance Schedule. The For vehicles first sold in Canada, 47911 Halyard Drive sections in this manual correspond substitute the name General Plymouth, MI 48170 “ to the sections in your owner s Motors of Canada Company for ’ USA ” manual. This manual, along with GMC and Chevrolet Motor Division your owner s manual, will assist you wherever it appears in this manual. ’ in the proper use and maintenance Using this Supplement This manual describes features that of your vehicle. This supplement contains may or may not be on the vehicle Keep this manual in the vehicle for information specific to the unique because of optional equipment that quick reference. components of the vehicle. It does was not purchased on the vehicle, not explain everything you need to know about the vehicle. Read this supplement along with the owner’s manual to learn about the vehicle's features and controls.

Litho in U.S.A. Part No. 84458631 A First Printing © 2019 General Motors LLC. All Rights Reserved. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Introduction 3 Index A good place to look for what you need is the Index in the back of this supplement. It is an alphabetical list of what is in the supplement, and the page number where you will find it. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

4 Introduction 2 NOTES Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Instruments and Controls 5 Instruments and Controls

Warning Lights, Gauges, and Indicators Instrument Cluster ...... 6 Malfunction Indicator Lamp (Check Engine Light) ...... 10 Wait-to-Start Light ...... 11 Diesel Exhaust Fluid (DEF) Warning Light ...... 11 Power Take-Off Light ...... 12 Information Displays Driver Information Center (DIC) ...... 12 Vehicle Personalization Vehicle Personalization ...... 13 Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

6 Instruments and Controls Warning Lights, Gauges, and Indicators Instrument Cluster

Base Level Chevrolet English Cluster, Metric Similar Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Instruments and Controls 7

Base Level GMC English Cluster, Metric Similar Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

8 Instruments and Controls

Uplevel GMC English Cluster, Metric Similar Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Instruments and Controls 9

Uplevel Chevrolet English Cluster, Metric Similar Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

10 Instruments and Controls Malfunction Indicator Malfunctions are often indicated by the system before any problem is Caution (Continued) Lamp (Check Engine noticeable. Being aware of the light Light) and seeking service promptly when costly repairs not covered by the it comes on may prevent damage. vehicle warranty. This could also This light is part of the vehicle’s affect the vehicle’s ability to pass emission control on-board Caution an Emissions Inspection/ diagnostic system. If this light is on Maintenance test. See while the engine is running, a Accessories and Modifications malfunction has been detected and If the vehicle is driven continually 0 60. the vehicle may require service. The with this light on, the emission light should come on to show that it control system may not work as is working when the ignition is on well, the fuel economy may be When the light is on, a malfunction with the engine not running. See lower, and the vehicle may not has been detected. Diagnosis and “Ignition Positions” in the owner’s run smoothly. This could lead to service may be required. manual. costly repairs that might not be Poor fuel quality can cause This light may also come on when covered by the vehicle warranty. inefficient engine operation and poor the system has detected a problem driveability, which may go away with the Diesel Exhaust Fluid (DEF) once the engine is warmed up. management system. See Diesel Caution If this occurs, change the fuel brand. Exhaust Fluid 0 25. It may require at least one full tank Modifications to the engine, of the proper fuel to turn the light off. 0 transmission, exhaust, intake, See Fuel for Diesel Engines 30. or fuel system, or the use of If the light remains on, see your replacement tires that do not dealer. meet the original tire specifications, can cause this light to come on. This could lead to (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Instruments and Controls 11 Emissions Inspection and . The light does not come on This light comes on briefly while Maintenance Programs when the ignition is on with the starting the engine, as a check to engine not running. show the light is working. If the vehicle requires an Emissions Inspection/Maintenance test, the . Critical emission control systems If the wait-to-start light comes on, test equipment will likely connect to have not been completely the glow plug system is required the vehicle's Data Link diagnosed. If this happens, the and operating. Wait until the light Connector (DLC). vehicle would not be ready for turns off before starting the engine. inspection and might require This light may not come on in warm several days of routine driving temperatures. before the system is ready for The fast warm-up glow plug system inspection. This can happen if makes the wait-to-start light stay on the 12-volt battery has recently for a shorter amount of time than been replaced or run down, or if most diesel engines. the vehicle has recently been serviced. See Starting the Diesel Engine 0 15. The DLC is under the instrument panel to the left of the steering See your dealer if the vehicle will not pass or cannot be made ready Diesel Exhaust Fluid wheel. Connecting devices that are (DEF) Warning Light not used to perform an Emissions for the test. Inspection/Maintenance test or to service the vehicle may affect Wait-to-Start Light vehicle operation. See “Add-On Electrical Equipment” in the owner’s manual. See your dealer if assistance is needed. The vehicle may not pass This light, a Driver Information inspection if: Center (DIC) message, and a chime . The light is on when the engine come on when there is an issue with is running. the Diesel Exhaust Fluid. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

12 Instruments and Controls If the DEF level has not been Information Displays to change the fuel filter on a corrected, the light will continue to schedule consistent with your flash when the vehicle is started. Driver Information driving conditions. The vehicle's speed may also be When the remaining fuel filter life is limited. Center (DIC) low, the CHANGE FUEL FILTER Also see Diesel Exhaust Fluid 0 25. The DIC is in the instrument cluster. message will appear on the display. The DIC comes on when the ignition Change the fuel filter as soon as Power Take-Off Light is on. possible. A Duramax diesel vehicle may have Fuel Filter Life Reset : Reset the the following additional DIC menu Fuel Filter Life Remaining display items: after each fuel filter change. It will not reset itself. Also, be careful not DEF : Displays the Diesel Exhaust to reset the display at any time other Fluid (DEF) level as a bar graph than when the fuel filter has just with individual segments that been changed because it cannot be Chassis Cab illuminate from Empty (E) to Full (F). reset accurately until the next fuel When LOW appears on the display The vehicle may have a Power filter change. The fuel filter life will and the segments turn red, add Take-Off (PTO) light. Under normal change to 100% when the system DEF as soon as possible. For a operating conditions, the PTO light has been reset. To reset the system, guide on how much DEF to add, will remain on throughout the PTO press and hold the thumbwheel for see Diesel Exhaust Fluid 0 25. operating cycle. If all conditions two seconds while Fuel Filter Life required to engage PTO have not Fuel Filter Life Remaining : This Remaining is displayed on the DIC. been met when enabling PTO, the display shows an estimate of the PTO light will turn on, then turn off fuel filter's remaining useful life. after one second. See Power If 90% Fuel Filter Life Remaining is Take-Off (PTO) 0 41. displayed, it means 90% of the current fuel filter life remains. The fuel filter life system will alert when Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Instruments and Controls 13 Engine Air Filter Life : Displays an Vehicle 5. Touch z to go to the top level estimate of the engine air filter’s of the Settings menu. remaining useful life and the state of Personalization the system. Engine Air Filter Life Climate and Air Quality Use the audio system controls to 95% means 95% of the current air access the personalization menus Select and the following may filter life remains. Messages will for customizing vehicle features. display: display based on the engine air filter life and the state of the system. The following features may be . Rapid Heat-Elevated Idle available on some vehicles with a When the REPLACE AT NEXT OIL Rapid Heat-Elevated Idle CHANGE message displays, the diesel engine. See “Vehicle engine air filter should be replaced Personalization” in the owner’s This allows the feature to be turned at the time of the next oil change. manual for additional vehicle on and off. See “Elevated Idle” in When the REPLACE SOON personalizations. Starting the Diesel Engine 0 15. message displays, the engine air If equipped, these features may be Select Off or On. filter should be replaced at the selected using the infotainment earliest convenience. The Air Filter display. Power Take-Off (PTO) (If Life display must be reset after the Equipped) To access the vehicle engine air filter replacement. To There may be additional features reset, see Engine Air Filter Life personalization menu: 0 that can be customized for the PTO. System 66. 1. Touch the Settings icon on the See Power Take-Off (PTO) 0 41. Home Page of the infotainment See your dealer to enable these display. features. 2. Touch Vehicle to display a list Select and the following may of available options. display: 3. Touch to select the desired . Standby Speed feature setting. . Set 1 Speed 4. Touch 9 or to turn a feature R . Set 2 Speed off or on. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

14 Instruments and Controls . Tap Step Speed TAP STEP SPEED . Shutdown Time This feature is available if the vehicle is configured for stationary STANDBY SPEED variable or mobile PTO, and allows This feature allows for modifying the the selection of the PTO tap step PTO Standby Speed. speed. Select the desired setting. Select the desired PTO Tap Step Speed setting. SET 1 SPEED This feature is available if the SHUTDOWN TIME vehicle is configured for stationary This feature is available if the preset PTO, and allows the vehicle is configured for stationary selection of the PTO set 1 speed. preset or stationary variable PTO, Select the desired PTO Standby Set and allows the selection of the PTO 1 setting. shutdown time. Select the desired PTO Shutdown SET 2 SPEED Time setting. This feature is available if the vehicle is configured for stationary preset PTO, and allows the selection of the PTO set 2 speed. Select the desired PTO Standby Set 2 setting. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 15 Filling a Portable Fuel Starting and Driving and Container ...... 39 Operating Operating Trailer Towing Trailer Towing ...... 39 Starting the Diesel Starting and Operating Conversions and Add-Ons Engine Starting the Diesel Engine . . . . . 15 Power Take-Off (PTO) ...... 41 Winter Cover ...... 18 The diesel engine starts differently Engine Heater ...... 21 than a gasoline engine. Parking over Things That Burn ...... 22 Caution

Diesel Particulate Filter If the steering wheel is turned Diesel Particulate Filter ...... 22 until it reaches the end of its Diesel Exhaust Fluid travel, and is held in that position Diesel Exhaust Fluid ...... 25 while starting the vehicle, damage may occur to the hydraulic power Brakes steering system and there may be Exhaust Brake ...... 29 loss of power steering assist. Fuel Top Tier Fuel ...... 30 Move the shift lever to P (Park) or Fuel Additives ...... 30 N (Neutral). To restart the engine Fuel for Diesel Engines ...... 30 when the vehicle is already moving, Biodiesel ...... 31 use N (Neutral) only. Cold Weather Operation ...... 32 Water in Fuel ...... 33 Running Out of Fuel ...... 36 Fuel Filter Replacement ...... 36 Filling the Tank ...... 37 Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

16 Driving and Operating most diesel engines, due to the For turbo protection, engine power Caution rapid heating of the glow plug at speeds above idle may be limited system. if the engine is cold. This protection Do not try to shift to P (Park) if the can last up to 40 seconds at vehicle is moving. If you do, you Caution extreme cold coolant and ambient could damage the transmission. temperatures. Shift to P (Park) only when the If the wait-to-start light stays on Cold Weather Starting vehicle is stopped. after starting the vehicle, the vehicle may not run properly. Use the recommended engine oil Starting the Engine Have the vehicle serviced when the outside temperature right away. drops below freezing. See Engine 1. Turn the ignition key to Oil 0 63. When the outside ON/RUN. temperature drops below –18 °C 3. If the engine does not start Observe the wait-to-start light. (0 °F), use of the engine coolant after 15 seconds of cranking, See Wait-to-Start Light 0 11. heater is recommended. turn the ignition off. Wait This light may not come on if one minute for the cranking If you experience longer cranking the engine is warm. motor to cool, then try the times, notice an unusual amount of 2. If the wait-to-start light is on, same steps again. exhaust smoke, or are at higher wait until this light goes off. elevations (over 2 135 m or 7,000 ft), If you are trying to start the engine Turn the ignition key to START, you may use the engine coolant after you have run out of fuel, follow then release the ignition key. heater. See Engine Heater 0 21. the steps in Running Out of Fuel The engine will continue to 0 0 36. See Fuel for Diesel Engines 30 for crank until the engine starts. information on what fuel to use in When the engine is cold, let it run The engine has a fast warm-up cold weather. for a few minutes before driving. glow plug system. The This lets oil pressure build up. The If the Diesel Engine Will Not wait-to-start light will illuminate engine will sound louder when it for a much shorter time than Start is cold. If the vehicle runs out of fuel, see Running Out of Fuel 0 36. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 17 If the vehicle is not out of fuel, and Be sure you are using the proper and engine warmup. These speeds the engine will not start: fuel for existing weather conditions. can range from approximately 600 0 Turn the ignition key to ON/RUN. See Fuel for Diesel Engines 30. to 1000 rpm. After the wait-to-start light goes off, If the engine starts, runs a short Elevated Idle turn the ignition key to START. time, then stops, the vehicle needs service. The engine has a cold temperature If the light does not go off, wait a high idle feature which elevates the few seconds, then try starting the engine idle speed from base idle to engine again. See your dealer as { Warning 1050 to 1100 rpm when outside soon as you can for a starting Do not use gasoline or starting temperatures are below 0 °C (32 °F), system check. and the engine coolant temperature aids, such as ether, in the air is below 65 °C (150 °F). This feature If the light comes on and then goes intake. They could damage the enhances heater performance by off and you know the batteries are engine, which may not be charged, but the engine still will not raising the engine coolant covered by the vehicle warranty. start, the vehicle needs service. temperature faster. They could also cause a fire, If the light does not come on when which could cause serious To turn this feature on or off, see 0 the engine is cold, the vehicle personal injury. Vehicle Personalization 13. needs service. When the engine is started, it will If the batteries do not have enough Engine Idle Variations slowly ramp up to the high idle charge to start the engine, see speed after a delay of a few “Battery” in the owner’s manual. Under certain conditions the engine seconds up to approximately idle speed can vary or be elevated. two minutes. For this method to Check that the correct engine oil Change in idle speed is normal and work properly there must be no has been used and changed at does not indicate a problem. Normal throttle or brake pedal faults. appropriate intervals. If the wrong oil conditions that can raise idle speed The engine idle speed will return to is used, the engine may be harder are low voltage, DPF regeneration, normal once the following conditions to start. air conditioning compressor loads, are met: Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

18 Driving and Operating . Engine coolant temperature Fast Idle control will be enabled . The vehicle speed is not reaches 65 °C (150 °F). when the following conditions 0 km/h (0 mph). . Air intake temperature reaches are met: 0 °C (32 °F). . The parking brake is set. Winter Cover The high idle speed will be . The transmission is in P (Park) If equipped, the winter cover can be temporarily interrupted and the or N (Neutral). used to enhance heater engine speed will return to normal if performance in extremely cold . The vehicle speed is about conditions below −4 °C (25 °F). The any of the following conditions 0 km/h (0 mph). occur: winter cover installs over the grille . The cruise control Set switch is and restricts airflow to the engine . The brake pedal is applied. pressed and released for Preset compartment. . The accelerator pedal is Fast Idle Speed (1200 rpm). For vehicles that did not come with pressed. Fast Idle control will be disabled a winter cover, a GM winter cover . The transmission is shifted out when one or more of the following can be purchased. See your dealer of P (Park) or N (Neutral). conditions occur: for additional information. . Vehicle speed is detected. . The cruise control Set switch is When the winter cover is in use, the heater, ventilation, and air Once these inputs are removed, the pressed and released. See conditioning AUTO mode may not engine idle speed will slowly ramp “Cruise Control” in the owner’s function properly. Use the manual back up to high idle after the normal manual. settings for comfort. delay, if the conditions for engine . The cruise control Cancel switch coolant temperature and air intake is pressed. Usage Guidelines temperature are still met. . The brake pedal is pressed. The winter cover should only be Fast Idle Control . The transmission is shifted out used while operating the vehicle in extremely cold temperatures or in If equipped, this system can be of P (Park) or N (Neutral). heavy snow for extended periods. In used to increase the engine idle . The parking brake is released. these temperatures, the vehicle speed. does not need a large amount of air Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 19 to properly cool the engine. When . Do not cover the opening in the ensure a tight fit. The initial more airflow is required to cool the front bumper. installation of the cover is best vehicle, the winter cover should not . Do not modify the cover. The performed when the winter cover be used. The following usage winter cover does not cover is warm. guidelines will allow adequate some sections of the front of the Installation (Chevrolet Pickup) airflow for proper radiator and air vehicle to provide enough cooler performance: airflow. . Do not use the winter cover if . When the winter cover is used, towing a trailer in conditions the outside air temperature above 10 °C (50 °F). The vehicle display may not function may overheat if the radiator is properly. covered while towing. . Keep the underside of the winter . Do not use the winter cover if a cover as clean as possible. snow plow is mounted on the Remove monthly or as truck. necessary and clean away dust and debris. . Use only a mild soap to clean. Do not use harsh soap, strong detergents, or vinyl protectant/ 1. The white label must be at the sealant type products as they top and back of the cover. may damage the special finish. Allow the winter cover to dry completely before reinstalling. Installation Instructions When first trying to fit the cover, it may appear to be undersized but will stretch during installation to Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

20 Driving and Operating Installation (GMC Pickup)

1. The white label must be at the top and back of the cover.

2. Starting in the middle, attach 3. To remove, reverse the steps fastening points as illustrated. listed previously. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 21 Engine Heater

{ Warning

Do not plug in the engine block heater while the vehicle is parked in a garage or under a carport. Property damage or personal injury may result. Always park the vehicle in a clear open area away from buildings or structures.

If equipped, the engine heater can provide easier starting in cold weather conditions at or below −18 °C (0 °F). For engine heater operation, see “Engine Heater” in the owner’s manual.

22 Driving and Operating Parking over Things Diesel Particulate Vehicles with the DPF have specific fuel and engine oil requirements. That Burn Filter See Fuel for Diesel Engines 0 30 and The exhaust system has a Diesel { Warning Engine Oil 0 63. Particulate Filter (DPF) to reduce Things that can burn could touch vehicle emissions. On some Caution hot exhaust parts under the exhaust systems with a DPF, the exhaust cooler mixes air with the vehicle and ignite. Do not park Damage can occur to the DPF over papers, leaves, dry grass, exhaust to lower the temperature before it leaves the tailpipe. components if the required Ultra or other things that can burn. Low Sulfur Diesel (15 ppm sulfur The DPF, the tailpipe, and other maximum) fuel and either CJ-4 or exhaust system components must CK-4 engine oil are not used. not be altered. Inspect regularly and This damage would not be clean any mud or dirt from the covered by the vehicle warranty. exhaust cooler, especially where the exhaust cooler connects to the tailpipe and the openings where Under certain conditions, such as fresh air enters the cooler. idling or very short trips, the The DPF will clean itself as part of self-cleaning process has less normal operation. Several factors efficiency and cannot be completed. including fuel consumed, hours of To resolve this, continue driving engine operation, and miles driven safely at a steady speed as close to are monitored by the Engine Control the posted speed limit as possible, Module (ECM). The self-cleaning preferably without stopping, until the occurs approximately once per tank message turns off. This can take up of fuel. to 30 minutes. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 23 If equipped with Power { Warning Caution (Continued) Take-Off (PTO), monitor the instrument cluster for lights related During DPF self-cleaning or for messages and take to the DPF. during extended idling in P (Park), appropriate action. Continued the exhaust system and exhaust idling with the warning light/ See Accessories and Modifications 0 gases are very hot. Things that message on could cause damage 60 if you are adding accessories burn could touch hot exhaust to the DPF requiring repair and or modifying the vehicle. parts under the vehicle and ignite. possible replacement that might Manual Regeneration of Diesel You or others could be burned. not be covered by the vehicle Particulate Filter Do not park, or idle for an warranty. extended period of time, near or This feature is only available on Fleet and Commercial vehicles. over papers, leaves, dry grass, During self-cleaning there will be a or other things that can burn. change in the exhaust sound and To verify that the vehicle has this Keep the exhaust area clear of engine idle speed. Along with this, a feature, refer to the Vehicle Service material that could ignite or burn. burning smell and reduction in fuel Parts Identification label (SPID) for See Parking over Things That economy may be noticed. This is RPO code FPF or see Burn 0 22. normal. www.gmupfitter.com to contact the GM Upfitter Integration Group. If the vehicle is idled or driven on very short trips with the DPF If equipped, this feature allows for manual cleaning/regeneration of the Caution warning message on and the exhaust filter is not cleaned as DPF when it is unable to clean Avoid extended idling because required, the malfunction indicator itself. It may be necessary to perform manual regeneration if the DPF system is not capable of lamp and a DIC message will driving conditions such as self-cleaning at idle. During display. See your dealer. Also see — extended slow speed, stop-and-go extended idling, monitor the Malfunction Indicator Lamp (Check Engine Light) 0 10. traffic, extended idling, short drive instrument cluster lights and DIC cycles, or stationary PTO operation (Continued) — prevent DPF self-cleaning. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

24 Driving and Operating Manual regeneration can only be . The shift lever is in P (Park). { Warning used when the DPF has become at . The fuel tank is at least least 90% full. At 100% full, it will one-eighth full. attempt to automatically self-clean if Do not leave the vehicle during proper driving conditions are met. the regeneration. . All fluids are at the proper level. The DPF will clean itself if the Make sure that there are no . No diagnostic trouble codes vehicle can be driven for about flammable materials near the have been set, and the 30 minutes. muffler, DPF, and exhaust pipe malfunction indicator lamp is A DIC message displays when which may result in a fire. not on. manual regeneration is possible. The temperature of exhaust . The engine coolant temperature Scroll through the DIC pages to find gases is high enough to burn you. is above 71 °C (160 °F). the Exhaust Cleaning menu. You and others could be seriously After making sure all safety Depending on whether the vehicle injured. conditions have been met, press the has a base or uplevel cluster, it may trip odometer reset stem or be under the Settings menu. Before starting manual thumbwheel on the steering wheel If the vehicle cannot be stopped regeneration, make sure all of the for at least one second to select when the DIC message first following safety conditions are met: Start on the infotainment display. indicates cleaning is available, . The vehicle is parked on level Follow the instructions in the DIC automatic self-cleaning may have messages. Touch ACCEPT to begun. If conditions cannot be met ground, away from any flammable materials. acknowledge that all of these safety for self-cleaning to complete, and conditions have been met and to manual regeneration is selected, it . The vehicle is parked outdoors, activate regeneration. may take up to four minutes for the away from any walls or system to switch to manual buildings. If the infotainment display returns to regeneration. When the switch the previous screen, then one or . The vehicle is at least 3 m (10 ft) more of the necessary safety occurs, a DIC message prompts to from any obstructions or start the cleaning process. conditions has not been met. If you materials that may combust cannot determine which condition or melt. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 25 has not been met, see When manual regeneration begins, Diesel Exhaust Fluid www.gmupfitter.com to contact the the engine speed increases, the GM Upfitter Integration Group. engine cooling fan sound increases, { Warning Continue to follow the instructions in and a DIC message indicates that cleaning is in progress. the DIC messages. Hold the Avoid getting Diesel Exhaust exhaust brake switch on the center A DIC message will display when Fluid (DEF) on your skin or in stack below the climate controls for cleaning is complete. Cleaning your eyes as it could cause more than three seconds, and then could take up to 30 minutes. Upon irritation. For more safety, release it, to begin the regeneration completion, the engine will return to handling, and storage information, process. normal idle, but exhaust see the Diesel Exhaust Fluid components will remain hot for If the EXHAUST BRAKE ON container label. message displays, then the switch several minutes. Do not move the was released too soon. Press it vehicle until the exhaust has had again to turn off the exhaust brake, time to cool. Manual regeneration then try again when the DIC can be canceled at any time by Caution message prompts. pressing the brake pedal or by turning the engine off. Unusual Use only DEF that is GM noises may be heard if regeneration approved, or fluid containing the is interrupted. API certified or ISO 22241 label. The use of other fluids could damage the system, requiring costly repairs that will not be covered by the vehicle warranty. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

26 Driving and Operating It is normal to hear the DEF system Filling the DEF Tank Caution purge fluid back into the tank after the vehicle is shut off. Do not mix with or add DEF to the diesel fuel. This could lead to Locating Diesel Exhaust Fluid costly repairs not covered by the DEF can be purchased at your vehicle warranty. authorized dealers. Additionally, some diesel truck fueling stations or Diesel Exhaust Fluid (DEF) is used retailers may have DEF for with diesel engines to reduce the purchase. For vehicles with an amount of regulated emissions active OnStar or connected services produced. Products such as AdBlue plan, OnStar can help to locate a are types of DEF. The fluid level in DEF retailer. See “Customer the DEF tank must be maintained Assistance Offices” in the owner’s for the vehicle to run properly. DEF manual for phone numbers to assist in contacting a dealer. See The blue DEF cap is behind the is not a fuel additive. DEF freezes fuel/DEF door. Do not remove the when exposed to temperatures Recommended Fluids and Lubricants 0 85. fuel and DEF caps at the same below −11 °C (12 °F). For DEF tank time. Fill diesel fuel and DEF capacity see Capacities and independently. Turn the DEF cap 0 Specifications 89. counterclockwise to remove. In cold conditions DEF can freeze in the DEF fill pipe opening. If this prevents the filling of the DEF tank, place the vehicle in a warm garage overnight. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 27 always add at least 7.5 L (2 gal) of fluid to release the vehicle from speed limitation. If DEF is added under freezing conditions it may require less fluid to fill the DEF tank. When fluid reaches the top of the DEF fill pipe, stop filling. Do not top off the DEF tank. If using a bottle or jug to refill DEF, follow the instructions on the container label and use a dedicated fill aid.

Caution

Do not overfill the DEF tank and do not allow DEF to contact the finished surfaces of the vehicle, as it could damage the vehicle finish. If DEF is spilled during filling, wipe any affected surface with a damp cloth.

When replacing the DEF cap, turn it Fill the DEF tank on level ground capacity see Capacities and clockwise until it clicks. Make sure and with the vehicle off. When Specifications 0 89. When adding the cap is fully installed. adding DEF, it is recommended to DEF to an empty or very low tank, Push the fuel/DEF door closed. fully fill the DEF tank. For DEF tank Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

28 Driving and Operating DEF Low (300 mi) of remaining range before The speed limitation will occur in a As the DEF level drops, warnings the exhaust fluid tank becomes series of steps with the final speed will automatically be displayed in the empty. limitation being 8 km/h (5 mph) Driver Information Center (DIC). As the fluid level nears empty, these along with a flashing warning light Select Vehicle Information in the messages appear every time the and chimes. DIC to view DEF level status. See vehicle is started. Adding fresh DEF to the system Driver Information Center (DIC) may resolve the problem after 0 If the DEF low warnings are ignored 12. and the DEF tank becomes empty, several kilometers/miles of driving, Refill the DEF tank at the first the DIC will display messages that depending on several factors. If the opportunity after a low warning describe the action needed and DIC message persists, see your indication to avoid vehicle speed distance until vehicle speed is dealer or additional DIC messages limitations. limited. For the DEF warning light may display. It may take some time for the symbol, see Diesel Exhaust Fluid Service DEF System (DEF) Warning Light 0 11. vehicle to detect that DEF has been If a problem occurs with the DEF added. If there was a vehicle speed DEF Quality Poor system, a DIC message displays limitation, it will be removed Use only DEF that is GM approved, along with distance until vehicle gradually and it may take several speed is limited. kilometers/miles for the DIC or fluid containing the API certified message to update. or ISO 22241 label. The speed limitation will occur in a DEF has an expiration date. If the series of steps with the final speed If DEF is added under freezing limitation being 8 km/h (5 mph) conditions, additional time may be system detects poor quality, or contaminated or diluted DEF, a along with a flashing warning light required to remove speed and chimes. limitations. DIC message will display along with distance until vehicle speed is In some cases, this message will The DEF range DIC message first limited. clear itself, indicating that the DEF displays at approximately 1 600 km system was able to correct the (1,000 mi). This message appears condition. If the DIC message again at approximately 500 km Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 29 persists, see your dealer or Brakes The exhaust brake only activates additional DIC messages may when the transmission torque display. converter is locked. This can vary Exhaust Brake based on vehicle speed, gear, Service Emission System The exhaust brake can be used to and load. If a problem occurs with the vehicle enhance the vehicle brake system To activate the system, press emission system, a DIC message and reduce brake lining wear. displays along with distance until EXHAUST BRAKE q on the center vehicle speed is limited. The speed Downshifts may be automatically stack. selected to increase engine speed, limitation will occur in a series of A light in the switch will come on steps with the final speed limitation which increases the effectiveness of the exhaust brake. The number of when the exhaust brake is of 88 km/h (55 mph) and chimes. In activated. The switch must be some cases, this message will clear downshifts selected is determined by the length of time the brakes are pressed at each vehicle start for the itself, indicating that the emission system to be active. system was able to correct the applied and the rate the vehicle is condition. If the DIC message slowing. The system delivers the The Driver Information Center (DIC) persists, see your dealer or correct amount of braking to assist displays the message EXHAUST additional DIC messages may in vehicle control. The heavier the BRAKE ON for approximately display. vehicle load, the more active the three seconds, then clears. engine exhaust brake will be. Use of To turn the brake off, press the the exhaust brake will help maintain exhaust brake switch a second time. vehicle speed when used with The DIC displays the message cruise control. See “Cruise Control” EXHAUST BRAKE OFF for in the owner’s manual. approximately three seconds, then Automatic downshifts will not occur clears. if the vehicle is in Range Selection The exhaust brake will be more Mode. See “Manual Mode” in the active when in Tow/Haul Mode. owner’s manual. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

30 Driving and Operating Fuel Fuel Additives Do not use a diesel blend containing more than 20% biodiesel by volume. TOP TIER Detergent Diesel is Top Tier Fuel highly recommended for use with Caution GM recommends the use of TOP your vehicle. If your area does not TIER Diesel Fuel to keep the engine have TOP TIER Detergent Diesel, Use of fuel that does not comply clean, reduce engine deposits, and GM recommends the use of with the required technical ACDelco Diesel Fuel Conditioner. maintain optimal vehicle standards can lead to engine This will help maintain optimal performance. Look for the TOP power loss, increased wear, TIER Logo or see engine performance. GM does not recommend other aftermarket diesel or engine damage and may void www.toptiergas.com for a list of TOP your warranty. TIER Diesel Fuel marketers and additives. applicable countries. If low-quality diesel is used for Some improper fuels are: refueling, GM recommends adding . Diesel fuel with the addition ACDelco Fuel System Treatment of gasoline. Plus-Diesel to help clean engine . Diesel fuel mixed with deposits. This is available only at engine oil or automatic your GM dealer. transmission fluid. Fuel for Diesel Engines . Triglyceride fuels, such as raw vegetable oil or animal The selection of a high-quality fuel fat, in any form, including is important for maintaining optimum with blends of diesel or vehicle performance. Diesel fuel biodiesel. should meet or exceed the minimum requirements in the most current . Marine diesel fuel and versions of the local fuel standards. fuel oils. Do not use fuel with more than 15 (Continued) ppm sulfur. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 31 Some conditions, such as dirty fuel, conventional diesel fuel and Caution (Continued) may decrease fuel filter life and a biodiesel blends, but may not CHANGE FUEL FILTER message prevent all cases. . Diesel-water emulsions, may come on in the Driver such as Aquazole. In case of severe winter conditions, Information Center (DIC). the fuel filter may become clogged . Aftermarket diesel fuel Climate Grade Diesel Fuels by wax naturally present in the fuel. additives, which contain To unclog it, move the vehicle to a alcohols, organo-metallic At temperatures below 0 °C (32 °F), warm garage area and allow the additives, or water avoid using biodiesel blends above filter to warm up. The fuel filter may emulsifiers. 5% by volume. Using such a fuel need to be replaced. See Fuel Filter may cause fuel filter plugging, Replacement 0 36. system gelling, and freezing, which may adversely impact vehicle Biodiesel Caution starting. Biodiesel is a renewable fuel If the vehicle is accidentally Severe winter grade diesel fuel, produced from vegetable oils or refueled with gasoline, do not such as 1-D diesel fuel or Arctic grade diesel fuel, can be used in animal fats that have been continue driving the vehicle. chemically modified to make it extreme cold temperatures (below Driving the vehicle will damage compatible with diesel fuel. the fuel system. Have the vehicle −18 °C or 0 °F); however, doing so will reduce power and fuel economy. towed to a qualified technician to Caution have the gasoline removed from Avoid using severe winter grade fuel the tank and fuel system. Refuel in warm or hot climates. It can result in stalling, poor starting, and Do not use home-made biodiesel with Ultra Low Sulfur Diesel fuel. damage to the fuel injection system. or home test kits because the It is also recommended to have quality cannot be verified by the fuel system flushed with Ultra Fuels improperly blended for cold approved scientific methods. Do Low Sulfur Diesel, to ensure all temperature operation may result in not use raw vegetable oil or other restricted fuel filters. The vehicle is gasoline is removed. unmodified bio-oils, fats, equipped with a fuel heating system to prevent gelling or waxing of (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

32 Driving and Operating As a renewable fuel, biodiesel refueled with biodiesel-free fuel, and Caution (Continued) provides some environmental driven several kilometers (miles) benefits. However, biodiesel has before storage. or blends of vegetable oil with unique properties and needs to be diesel. They could damage the handled differently than diesel fuel. Cold Weather Operation fuel system and engine, and Its use presents additional risks and damages would not be covered may not be appropriate in all In cold weather, the fuel filter may by the vehicle warranty. situations. Certain vehicle operating become clogged by wax naturally modes increase these risks and present in the fuel. To unclog it, should be avoided. move the vehicle to a warm garage Biodiesel Blends area and allow the filter to warm up. Fuels with a biodiesel content up to Biodiesel fuel quality degrades with The fuel filter may need to be 20% by volume may be used (e.g., time and exposure to high replaced. See Fuel Filter named B20). Only use biodiesel temperature quicker than Ultra Low Replacement 0 36. blends up to 20% by volume that Sulfur Diesel fuel. More frequent refueling provides the best At temperatures below 0 °C (32 °F), comply with your country’s or opportunity to have a supply of fresh it is recommended to avoid using region’s fuel standards. fuel. Storage at hot ambient biodiesel blends above 5% blend. temperatures will accelerate This blend may cause fuel filter Caution biodiesel degradation. plugging, system gelling, and freezing that may affect vehicle Do not use blends containing If the vehicle is not driven often and starting. You may need to turn the more than 20% biodiesel. Any uses little fuel, or if it is stored for ignition on and off a few times engine, fuel system, or exhaust extended periods of time, avoid the before the vehicle will start. Also, after-treatment system damage use of biodiesel blended fuels idle the vehicle for a couple of would not be covered by the above 5% by volume. When the minutes before accelerating. vehicle warranty. vehicle is stored for longer than one month, it should be run out of It is recommended to use Ultra Low biodiesel to below one-quarter tank, Sulfur No. 1-D diesel fuel or a blend of No. 1-D and No. 2-D diesel fuel to enhance vehicle operation in cold Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 33 weather at temperatures below 0 °C Water in Fuel Troubleshooting (32 °F). Use of No. 1-D diesel fuel Caution If the WATER IN FUEL SERVICE may lower the fuel economy. For REQUIRED message comes on: additional information for better cold Water in the diesel fuel can weather operation, see Engine corrode internal components of Recommended Heater 0 21. the fuel system and lead to Problem Action severe damage. It can also support fungus or bacteria Message The fuel filter is Water in Fuel displays but partially filled growth, which can damage the Improper fuel tank inspection or goes off during with water. Drain fuel system. Even with a diesel the ignition the water as cleaning, or contaminated fuel from fuel biocide, the fuel system may suppliers, can cause water to be cycle. soon as still need to be cleaned. Your possible. See pumped into the fuel tank along with dealer can advise of the the diesel fuel. If a WATER IN FUEL "Removing appropriate solution. SERVICE REQUIRED message Water from the displays, the water must be drained If the fuel tank needs to be Fuel Filter" immediately. purged to remove water, see your following. dealer or a qualified technician. { Warning Improper purging can damage the fuel system. Diesel fuel containing water is still combustible. You or others could be burned. If the fuel needs to be drained, keep sparks, flames, and smoking materials away from the mixture. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

34 Driving and Operating

Recommended Recommended Caution Problem Action Problem Action Message Drain the fuel Immediately A large amount Driving with this message on can displays and filter after refueling, of water is in the damage the fuel injection system stays on. immediately. message fuel tank. Drain and the engine. If the message If no water can displays and the fuel filter comes on right after a refuel, be drained, and stays on. immediately. water was pumped into the fuel the temperature If the message tank. Turn off the engine and is below stays on or drain the water immediately. freezing, then comes back on water may be without frozen in the refueling, then Removing Water from the Fuel filter. Move the fuel tank purging Filter vehicle to a is required. See To drain water: warm location to your dealer. thaw the water, If the message 1. Turn the engine off and apply then drain the displays and the the parking brake. fuel. If water still engine stalls or does not drain, runs rough, do see your dealer. not drive until the water contaminated fuel is drained. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 35 5. Start the engine and let it run Priming the Fuel System for a few minutes. During the There is an electric priming pump draining process, air may have that will bring fuel to the engine and entered the fuel system. If the eliminate air in the fuel lines. To engine stalls, the fuel system prime the engine: may need to be primed. See “Fuel Priming” following. 1. Correct any condition that caused the loss of prime. Fuel Priming 2. Turn the ignition on for For the fuel system to work properly, 30 seconds. Do not start the the fuel lines must be full of fuel. engine. The fuel pump will start If air gets in, the fuel lines need to priming. be primed before operating the 2. Place a container under the vehicle. 3. Turn the ignition off, then back filter drain valve. The filter drain on, and crank the engine for valve is on the bottom of the If air is present, the following may 15 seconds. fuel filter. The filter drain valve have happened: 4. If the engine does not start, is under the vehicle on the . The vehicle ran out of fuel. repeat Steps 2 and 3 until the driver side, inside the engine starts. frame rail. . The fuel filter was removed. If the engine does not start 3. Open the drain valve by turning . The fuel lines were removed or after repeating Steps 2 and 3 it counterclockwise. Allow the disconnected. three times, turn the ignition off filter to drain until all of the . The fuel filter water drain valve for 60 seconds. water has been removed. was opened while the engine Close the valve. was running. 5. Repeat the above steps until the engine starts. 4. Properly dispose of the water contaminated fuel. 6. If the engine starts, but does not run smoothly, increase the engine speed slightly. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

36 Driving and Operating 7. If the engine starts and runs Fuel Filter Replacement but stalls again, turn the ignition off for 60 seconds. { Warning 8. When the engine starts, let it idle for a few minutes and Diesel fuel is flammable. It could check the filter for any leaks. start a fire if something ignites it, and people could be burned. Do Running Out of Fuel not let it get on hot engine parts, and keep matches or other If the engine has stalled due to running out of fuel, try to restart it: ignition sources away. 1. If parked on a level surface, add at least 3.8 L (1 gal) of fuel. The fuel filter is on the driver side, 3. Remove the filter element cap Up to 18.9 L (5 gal) may be inside the frame rail. by turning it counterclockwise. needed if parked on a slope. To replace the fuel filter: 4. Remove the filter element. 2. Follow the vehicle fuel system 1. Drain any water from the filter. If there is any dirt on the filter priming procedure earlier in See “Removing Water from the sealing surface, clean it off. this section to re-prime the Fuel Filter” in Water in Fuel 5. Install the new filter element system and restart the engine. 0 33. and o-ring. If the malfunction indicator lamp Keep the engine off until the 6. Reinstall and tighten the filter (check engine light) comes on due procedure is completed. cap to the housing. to running out of fuel, it may take a 2. Apply the parking brake. few drive cycles to clear. 7. Use the fuel filter priming procedure to prime the fuel filter. See “Fuel Priming” in Water in Fuel 0 33. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 37 8. Start the engine and let it idle for five minutes. Check the fuel Warning (Continued) Warning (Continued) filter and air bleed valve for leaks. Follow these guidelines to help . Keep children away from 9. Reset the fuel filter monitor. avoid injuries to you and others: the fuel pump and never let See Driver Information Center . Read and follow all the children pump fuel. (DIC) 0 12. instructions on the fuel . Before touching the fill pump island. nozzle, touch a metallic Filling the Tank . Turn off the engine when object to discharge static electricity from your body. An arrow on the fuel gauge refueling. indicates which side of the vehicle . Keep sparks, flames, and . Fuel can spray out if the fuel the fuel door is on. See “Fuel smoking materials away cap is opened too quickly. Gauge” in the Owner’s Manual. Do from fuel. This spray can happen if the not refill the diesel fuel and Diesel tank is nearly full, and is Exhaust Fluid (DEF) at the . Do not leave the fuel pump more likely in hot weather. same time. unattended. Open the fuel cap slowly . Avoid using electronic and wait for any hiss noise { Warning devices while refueling. to stop, then unscrew the cap all the way. . Do not re-enter the vehicle Fuel vapors and fuel fires burn while pumping fuel. violently and can cause injury or death. (Continued) (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

38 Driving and Operating

Warning (Continued) { Warning

. Vehicle performance issues, If a fire starts while you are including engine stalling and refueling, do not remove the fill damage to the fuel system. nozzle. Shut off the flow of fuel by . Fuel spills. shutting off the pump or by notifying the station attendant. . Under certain conditions, Leave the area immediately. fuel fires.

Diesel fuel can foam when filling the tank. The automatic pump nozzle Caution Double Cab Shown, Crew Cab may shut off, even if the tank is not Similar If a new fuel cap is needed, be full. Wait for the foaming to stop, Turn the fuel cap counterclockwise and then fill the tank more slowly. sure to get the right type of cap to remove. When refueling, hang the Be careful not to spill fuel. Wait from your dealer. The wrong type fuel cap from the hook on the fuel five seconds after pumping before of fuel cap may not fit properly door. Fully insert and latch the fill removing the fill nozzle. Clean fuel and could damage the fuel nozzle, begin fueling. from painted surfaces as soon as system. possible. See Exterior Care 0 78. { Warning Reinstall the cap by turning it clockwise until it clicks. Push the Overfilling the fuel tank by more fuel door closed. than three clicks of a standard fill nozzle may cause: (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 39 Accidental Refueling with Trailer Towing Gasoline Warning (Continued) When towing at high elevation on means. You or others could be Caution steep uphill grades, consider the badly burned and the vehicle following: could be damaged. Always: If the vehicle is accidentally Engine coolant at higher elevation refueled with gasoline, do not . Use approved fuel will boil at a lower temperature than continue driving the vehicle containers. at or near sea level. If the engine is except to get to a location where . Remove the container from turned off immediately after towing it can be stopped safely. Driving the vehicle, trunk, or pickup at high elevation on steep uphill the vehicle will damage the bed before filling. grades, the vehicle may show signs engine. Tow the vehicle for similar to engine overheating. To service. Have the gasoline . Place the container on the avoid this, let the engine run while ground. removed from the tank and fuel parked (preferably on level ground) system. . Place the nozzle inside the with the transmission in P (Park) fill opening of the container and the parking brake applied for at before dispensing fuel, and least five minutes before turning the Filling a Portable Fuel keep it in contact with the fill engine off. If the overheat warning Container opening until filling is comes on, see Engine Overheating complete. 0 74. { Warning . Fill the container no more Use the following chart to determine than 95% full to allow for the maximum the trailer can weigh, Filling a portable fuel container expansion. based upon your vehicle model and while it is in the vehicle can cause options. . Do not smoke, light fuel vapors that can ignite either matches, or use lighters All axles of the trailer must be by static electricity or other while pumping fuel. equipped with brakes adequate for (Continued) the intended use. Trailer braking . Do not use electronic equipment conforming to Canadian devices while pumping fuel. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

40 Driving and Operating Standards Association (CSA) Axle Weight Rating). See “Total requirement CAN3-D313, or its Weight on the Vehicle's Tires” in the equivalent, is recommended. owner’s manual. See “Trailer Towing” in the owner’s After loading the trailer, weigh the manual for kingpin weight and trailer trailer and then the tongue, tongue weight information. separately, to see if the weights are proper. If they are not, adjustments Weight of the Trailer Tongue might be made by moving some The tongue weight load (1) of any items around in the trailer. trailer is very important because it is If a cargo carrier is used in the also part of the vehicle weight. The trailer hitch receiver, choose a Gross Vehicle Weight (GVW) carrier that positions the load as includes the curb weight of the The trailer tongue weight (1) should close to the vehicle as possible. vehicle, any cargo carried in it, and be 10-15% of the total loaded Make sure the total weight, the people who will be riding in the trailer (2). including the carrier, is no more than vehicle as well as trailer tongue Do not exceed the maximum half of the maximum allowable weight. Vehicle options, equipment, allowable tongue weight for the tongue weight for the vehicle or passengers, and cargo in the vehicle. Choose the shortest hitch 227 kg (500 lb), whichever is less. vehicle reduce the amount of extension that will position the hitch tongue weight the vehicle can carry, ball closest to the vehicle. This will which will also reduce the trailer help reduce the effect of trailer weight the vehicle can tow. tongue weight on the rear axle. Trailer rating may be limited by the vehicle's ability to carry tongue weight. Tongue or kingpin weight cannot cause the vehicle to exceed the GVWR (Gross Vehicle Weight Rating) or the RGAWR (Rear Gross Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 41 Conversions and PTO Switch Refer to the bulletins in the GM Upfitter Integration website Add-Ons www.gmupfitter.com for the PTO Operating Description and Power Take-Off (PTO) Application Guide. If equipped, the Power Take-Off (PTO) is a GM Upfitter integrated { Warning system that creates an auxiliary Engine exhaust contains Carbon power source for running add-on Monoxide (CO), which cannot be equipment, such as salt spreaders, seen or smelled. Exposure to CO snow plows, winches, and lift buckets. It controls engine speed to can cause unconsciousness or values higher than normal base idle, even death. Never operate PTO PTO integral clutch engagement, in an enclosed area such as a and remote starting and shutdown If equipped, there is an available garage or building that has no of the engine. PTO switch in the auxiliary fresh air ventilation. See “Engine switchbank in one of the right side Exhaust” in the owner’s manual. positions. When installing PTO aftermarket equipment, the PTO wiring and { Warning operation recommendations provided by the service manual and If the key is in the ignition (Key GM Upfitter documentation must be Access) or the RKE transmitter is strictly followed. in the vehicle (Keyless Access) during Remote PTO operation, the vehicle can be shifted out of P (Park). Even though PTO will (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

42 Driving and Operating . Mobile ‐ Mobile Warning (Continued) In-cab control only. Variable The configuration is be disengaged, depending on speed control only available. variable only. PTO Upfitter application, personal . Operator Selectable In-Cab Selection between OSIM injury or property damage may Mode (OSIM) pairings is not available. result from vehicle movement. In-cab operation only. Remote modes are not Always remove the key from the available. ignition or the RKE transmitter OSIM is for vehicles that require from the vehicle before operating both stationary and mobile The factory default programming Remote PTO, unless the Remote modes. OSIM is available via the enables in-cab control. For Operation In-Cab Enable feature GM Service Tool only. During the stationary modes, the GM Service is used. configuration of OSIM, two Tool can reprogram the system to modes must be paired: allow for remote control and disable stationary preset and mobile, the in-cab control. Primary PTO Operating Modes or stationary variable and All PTO modes provide for engine PTO modes of operation are: mobile. During activation of rpm control and PTO clutch control. OSIM, one of the two modes . Preset within the pre-configured pairing All PTO modes provide for safety Stationary operation only: In-cab must be selected. If an OSIM interlocks for PTO load control is standard, remote mode is not selected, PTO will disengagement. control is available. Preset not operate. Remote PTO modes provide for speed control is standard. OSIM modes of operation are: remote engine starting and shutdown. . Variable ‐ Stationary Stationary in-cab and Remote PTO Available in in-cab control and in The configuration may be remote control. modes provide for engine shutdown stationary preset or stationary due to critical engine conditions, as variable. well as a timed engine shutdown feature. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 43 Preset PTO the PTO present speeds if 3. When the PTO indicator light is configured by the GM Service either flashing or on solid, the Preset Enable Conditions – Tool. The PTO must be PTO clutch will be activated. In-Cab Operation operated below the Max PTO Preset Enable Conditions To enable PTO: – Engine Speed configured. Remote Operation 1. With the engine running, shift Factory Default PTO Engine This requires programming with the the vehicle into P (Park) and Speeds GM Service Tool and remote switch set the parking brake. Do not panel provided by GM Upfitter. press the brake pedal. Standby 900 rpm 1. Confirm cruise control is off. 2. Confirm cruise control is off. Set 1 (SET−) 1200 rpm 2. Set the parking brake and shift 3. Press and release the PTO Set 2 (+RES) 1900 rpm the transmission into P (Park). in-cab switch below the climate controls in the center stack. The first time PTO is used: 3. Turn the ignition off or remove The PTO clutch will engage. 1. The PTO Control setting on the the ignition key, if equipped. The PTO indicator light will GM Service Tool is 4. Confirm the hood is closed. flash rapidly until the engine programmed to Interior Mode 5. From outside the vehicle, press reaches the PTO Standby PTO Switch. Speed and it will then be on and release the Remote PTO steady. 2. Check the correct operation of Arm switch. the default PTO preset 6. Within five seconds, open and 4. Once the PTO Standby Speed stationary mode to observe the is reached, use SET− and close the Remote PTO Engine three idle up speeds. The PTO Start/Shutdown switch. +RES on the cruise control to function should be confirmed reach the Set 1 or Set 2 PTO before any wiring modifications 7. The horn will chirp, and engine engine speeds. are done or any starting will be initiated. The The accelerator pedal is reprogramming is attempted. PTO system will then elevate disabled in standard See your dealer if the default engine rpm to PTO Standby configuration. The accelerator presets are not functioning pedal may be used to override properly. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

44 Driving and Operating Speed and engage the PTO 6. The Remote PTO Set switch clutch. Park lamps will Warning (Continued) may be used to select PTO Set come on. 1 and Set 2 engine speeds. Remote PTO, unless the Remote 8. The Remote PTO Set switch Operation In-Cab Enable feature The accelerator pedal is disabled can now be used to set the is used. when Remote PTO operation is PTO Set 1 and Set 2 engine selected. speeds. The vehicle may be exited. Preset Enable Conditions – The accelerator pedal is disabled Remote Operation In-Cab Enable With the Remote Operation In-Cab when Remote PTO operation is Enable feature remote PTO selected. This requires programming with the GM Service Tool and remote switch operation may be ended by panel provided by GM Upfitter. pressing the brake pedal, at which { Warning time the PTO clutch disengages and To start remote operation in-cab: the engine returns to base idle If the key is in the ignition (Key 1. With the engine running, shift speed. The vehicle can be driven Access) or the RKE transmitter is the vehicle into P (Park), after the parking brake is released. in the vehicle (Keyless Access) release the brake pedal, and Preset Enable Conditions – during Remote PTO operation, set the parking brake. the vehicle can be shifted out of Operator Selectable In-Cab Mode (OSIM) P (Park). Even though PTO will 2. Confirm cruise control is off. be disengaged, depending on 3. Confirm the hood is closed. This requires programming with the PTO Upfitter application, personal GM Service Tool and requires 4. Press and release the in-cab pairing OSIM stationary preset with injury or property damage may PTO switch. result from vehicle movement. OSIM mobile mode. If OSIM pairing Always remove the key from the 5. The horn will chirp, the PTO has been configured, initiate OSIM ignition or the RKE transmitter clutch will engage, and the preset operation: from the vehicle before operating engine will advance to the PTO Standby Speed. Park lamps (Continued) will come on. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 45 1. With the engine running, shift 6. The PTO clutch will engage reaches the PTO Standby the vehicle into P (Park), and the PTO indicator light will Speed and it will then be on release the brake pedal, and change to solid when the steady. set the parking brake. engine speed reaches the PTO 3. Once PTO Standby Speed is 2. Confirm cruise control is off. Standby Speed. Press and reached, SET− and +RES on release SET− on the cruise 3. Confirm the hood is closed. the cruise control can be used control to select the PTO Set 1 to tap up and tap down the 4. Press and release the in-cab speed. Press and release engine speed. Factory setting PTO switch. The PTO indicator +RES on the cruise control to for the tap step is 100 rpm and light will flash slowly. select the PTO Set 2 speed. the setting for the ramp rate is 5. Within 10 seconds, press and Variable PTO 148 rpm/sec. The GM Service release SET− on the cruise Tool can enable changing the Variable Enable Conditions – control. default value for tap step In-Cab Operation through vehicle . The PTO clutch engages This requires programming with the personalization. The default when the PTO operation is GM Service Tool. values for both tap step and initiated by the switch input. ramp rate can be changed with To enable PTO: . The first elevated engine the GM Service Tool. The speed, PTO Standby 1. With the engine running, shift accelerator pedal is disabled, Speed, is intended as the vehicle into P (Park), and cannot be used to control verification that the system release the brake pedal, and PTO engine speed. set the parking brake. Make is active and ready to go to Variable Enable Conditions sure Cruise Control is off. – a working speed. This Remote Operation speed can be modified to a 2. Press and release the PTO This requires programming with the working speed with the GM in-cab switch below the climate GM Service Tool and the Service Tool. The upper controls in the center stack. appropriate remote switch panel limit for PTO Standby The PTO clutch will engage. provided by GM Upfitter. Speed is 1500 rpm. The PTO indicator light will flash rapidly until the engine 1. Confirm cruise control is off. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

46 Driving and Operating 2. Set the parking brake and shift 4. Press and release the PTO the transmission into P (Park). Warning (Continued) in-cab switch. 3. Turn the ignition off or remove P (Park). Even though PTO will 5. The horn will chirp, the PTO the ignition key, if equipped. be disengaged, depending on clutch will engage, and the 4. Confirm the hood is closed. PTO Upfitter application, personal engine will advance to the PTO injury or property damage may Standby Speed. 5. From outside the vehicle, press result from vehicle movement. and release the Remote PTO The vehicle may be exited. Arm switch. Always remove the key from the The accelerator pedal is disabled ignition or the RKE transmitter 6. Within five seconds, open and when Remote PTO operation is from the vehicle before operating selected. close the Remote PTO Engine Remote PTO, unless the Remote Start/Shutdown switch. Operation In-Cab Enable feature . The desired engine operating 7. The horn will chirp, and then is used. speed can now be reached. engine starting will be Switches or potentiometer automatically initiated. The engine rpm controls are Variable Enable Conditions PTO system will engage the – available, depending on which Remote Operation In-Cab Enable PTO clutch and then elevate one was installed. Starting Remote Operation from engine rpm to PTO Standby Switches The Remote PTO In-Cab ‐ – Speed. Set and Resume switches can This requires programming with the be used to tap up and tap { Warning GM Service Tool and remote switch down to the desired engine panel provided by GM Upfitter. speed. If the key is in the ignition (Key 1. With the engine running, shift ‐ Potentiometer – A Remote Access) or the RKE transmitter is the vehicle into P (Park), PTO Throttle Potentiometer in the vehicle (Keyless Access) release the brake pedal, and can be used as a continuous during Remote PTO operation, set the parking brake. variable throttle control to dial the vehicle can be shifted out of 2. Confirm cruise control is off. in the desired engine speed. (Continued) 3. Confirm the hood is closed. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 47 Press the brake pedal to end 5. Within 10 seconds, press and . Factory setting for the tap step is remote PTO operation. The PTO release SET− on the cruise 100 rpm and the setting for ramp clutch disengages and the engine control. The PTO clutch will rate is 148 rpm/sec. The value returns to base idle speed. The engage and the engine speed for tap step can be modified vehicle can be driven after the will advance to the PTO through vehicle personalization. parking brake is released. Standby Speed. The PTO The values for both tap step and Variable Enable Conditions indicator light will change to ramp rate can be changed with solid. the GM Service Tool. – OSIM This requires programming with the 6. Tap +RES and SET− on the . Refer to the service manual or GM Service Tool and specific cruise control for the desired go to the GM Upfitter Integration pairing of stationary variable and operating speed. website www.gmupfitter.com. mobile modes. Remote operation is . The first elevated engine speed, Mobile PTO not available. PTO Standby Speed, is intended as verification that the system is Mobile Enable Conditions – If OSIM pairing has been In-Cab Operation Only configured, initiate OSIM stationary active and ready to go to a variable operation: working speed. This requires programming with the GM Service Tool. 1. With the engine running, shift . The engine speeds can be the vehicle into P (Park), adjusted between the low of 1. The engine must be running. PTO Standby Speed and the release the brake pedal, and 2. The parking brake must be high of PTO Max Engine Speed set the parking brake. released. limits. Both values can be 2. Confirm cruise control is off. modified with the GM Service 3. Confirm cruise control is off. 3. Confirm the hood is closed. Tool. Based on the value chosen 4. Engine rpm must be less than for PTO Max Engine Speed, the 1500 rpm. 4. Press and release the PTO PTO menu in the center stack in-cab switch. The PTO may show speeds that are not 5. Shift the transmission to L1, indicator light will flash slowly. available. L2, L3, L4, or L5. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

48 Driving and Operating 6. Tap the brake pedal but do not will not engage. PTO can be speed. Normal tap up and continue pressing the brake engaged when the engine tap down can then be used pedal. speed drops below 1500 rpm. to fine tune the setting. 7. Keep the driver door closed. 9. Once engaged, if additional In Mobile PTO mode, the vehicle The driver door can be kept engine speed is desired, use speed reached is the result of the open if reconfigured using the either the cruise control or the current engine speed requested and GM Service Tool. See accelerator pedal to temporarily the transmission gear range www.gmupfitter.com. adjust the engine speed. selected. The gears available for selection are L1 through L5. The 8. Press and release the PTO ‐ +RES or SET− on the cruise in-cab switch below the climate control can be used to tap up transmission may limit the selection controls in the center stack. or down, or if continuously of a higher gear until a minimum Within 10 seconds press and held to ramp up or down, to speed for that gear is reached. release +RES on the cruise the desired operating speed. Attempts to up-shift higher than L5 control. The PTO indicator light Top limit is PTO Max Engine will be denied by the transmission will flash slowly between Speed, default 2100 rpm and system. presses. The PTO clutch will programmable to 3100 rpm. Mobile Enable Conditions – engage and the PTO indicator Lower limit is PTO Standby Operator Selectable In-Cab light will flash rapidly until PTO Speed, default 900 rpm with Mode (OSIM) reaches Standby Speed, and program range from base This requires programming with the then the light will become idle to 900 rpm. GM Service Tool and specific steady. The engine speed will ‐ The accelerator pedal can be pairing mobile mode with either remain at the current throttle used to achieve the desired stationary preset or variable. setting or advance to PTO speed. When the desired Remote operation is not available. Standby Speed, whichever speed is reached, use SET− value is greater. If the engine See “Mobile PTO” previously in this on the cruise control to section. speed is above 1500 rpm capture and maintain that (configurable), the PTO clutch Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 49 PTO System Disengage stored in memory. Pressing Power Take Off (PTO) operating Conditions +RES on the cruise control will description and application restore engine rpm to the last guide. Preset or Variable Stationary PTO set speed. Modes – In-Cab Operation . For key access vehicles, turn the . Press the PTO in-cab switch. ignition on and press the brake To disengage PTO, do one of the The PTO clutch disengages and pedal. For keyless access following: the engine returns to base idle. vehicles, hold the push button . Press the brake pedal. The The PTO indicator light will turn start for two seconds. Press the engine returns to base idle, but off, indicating the PTO clutch is brake pedal. The PTO clutch the PTO clutch remains disengaged and the stored set disengages and the engine engaged. The PTO indicator speed has been cleared from returns to base idle speed. light will flash slowly indicating memory. Stationary Modes will also that a PTO set speed is still Stationary Modes (Preset or disengage if: stored in memory. When the Variable) – Remote Control brake pedal is released, the . Vehicle movement is detected. engine speed will return to curb To disengage PTO: . The parking brake is released. idle. A press and release of . Open the Remote PTO Engine +RES on the cruise control will . The transmission is shifted out Start/Shutdown switch. The PTO of P (Park). restore engine rpm to the last clutch disengages and the PTO set speed. The PTO engine will stop. . The ignition is cycled from on system can also be programmed to off. to return engine rpm to the PTO . If equipped, press the PTO . The PTO feedback signal is lost Standby Speed setting. Emergency Stop switch. The PTO clutch disengages and the indicating the load is disengaged . Press * on the cruise control. engine will stop. Refer to the if used. See The engine returns to base idle, bulletins in the GM Upfitter www.gmupfitter.com. but the PTO clutch remains Integration website . Cruise control becomes enabled. engaged. The PTO indicator www.gmupfitter.com for the light will flash slowly indicating that a PTO set speed is still Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

50 Driving and Operating . Timed auto-engine shutdown: Resume memory speed is cleared engine will return to base idle PTO must be operational for this for the above actions. unless the accelerator pedal is function to be active. When Remote PTO engine starting pressed. The PTO clutch . The engine is shut down based has been initialized with the ignition remains engaged. The PTO on critical engine or PTO system key in the RUN position, the shift indicator light will flash slowly fault conditions: This feature will lever will remain locked. A shift out indicating that a PTO set speed shut down the engine when PTO of P (Park) will not be allowed while is still stored in memory. Upon is operating if a critical engine the engine is running and PTO is releasing the brake, the factory condition such as low oil, low oil active, until one of the following default programming is for the pressure, hot engine, hot actions is taken: engine speed to remain at curb transmission, low fuel, or Diesel idle awaiting an input from +RES . Press the brake pedal. PTO will on the cruise control to restore Particulate Filter regeneration is disengage. Engine will run at detected by the vehicle system. engine rpm to the last PTO set idle speed and shift lever can be speed. The system can also be If PTO operation is continued shifted from P (Park). when critical engine conditions programmed to return engine are present, a horn chirp . Press the PTO in-cab switch, rpm to the PTO Standby Speed setting. warning will occur after 30– only if the PTO in-cab Remote 60 seconds. The engine will shut Start/Stop feature is enabled. . Press * on the cruise control. down two minutes after the horn This requires programming with The engine returns to base idle, warning. The engine can be the GM Service Tool. PTO will but the PTO clutch remains disengage and shift lever can be restarted with the ignition key or engaged. The PTO indicator shifted from P (Park). with the Remote PTO engine light will flash slowly indicating start controls or by push button Mobile Mode that a PTO set speed is still start. The horn warning and To disengage PTO: stored in memory. Pressing engine shutdown will again +RES on the cruise control will occur if the critical engine . Press the brake pedal. The PTO restore engine rpm to the last condition is still present. system releases control of PTO set speed. . Maximum engine torque limit engine speed, but the PTO has been reached. clutch remains engaged. The Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 51 . Press the PTO in-cab switch. . Engine Speed exceeds Max To disable OSIM Mobile PTO: The PTO clutch disengages and Engine Speed for more than . Press and release the PTO the engine returns to base idle. 15 seconds. Factory default in-cab switch. The PTO indicator light will turn setting = 2100 rpm. off, indicating the PTO clutch is 5 Prolonged or Extended PTO disengaged and the stored set . on the cruise control is Operation speed has been cleared from pressed. When operating the vehicle in memory. . The parking brake is applied. stationary PTO mode, the Diesel Mobile Mode will also disengage if: . Maximum engine torque limit Particulate Filter (DPF) will continue . PTO feedback input is lost. The has been reached. to filter the exhaust and build up engine speed is returned to the Resume memory speed is cleared soot. The engine control system, PTO Standby speed setting and for the above actions. depending on the speed and load the load is still engaged. This is being applied by the PTO, may not configurable with the GM Although the PTO system attempts be able to generate enough energy Service Tool. to limit accelerator and PTO switch or adequate heat needed to inputs to comply with maximum automatically clean or regenerate . Vehicle Speed exceeds Max speed and/or rpm parameters, some the DPF. If manual regeneration is Vehicle Speed. Factory default vehicle operating conditions such as not initiated, continued operation setting = 94 km/h (58 mph). PTO downhill acceleration can cause the under conditions that do not allow will re-engage and advance to vehicle speed or engine rpm to effective regeneration or cleaning the last engine speed stored in exceed these limits. In those cases, will eventually plug the DPF and memory when both the vehicle the PTO system may disengage. result in reduced power. The speed is reduced below 94 km/h ENGINE POWER IS REDUCED (58 mph) and the engine speed Operator Selectable In-Cab Mode (OSIM) Driver Information Center (DIC) ramps down below the maximum message and malfunction indicator PTO engagement speed (1500 To disable OSIM Stationary PTO: lamp will display. See your dealer rpm factory default setting). . Press and release the PTO for service. To prevent this, in-cab switch. frequently monitor the vehicle during stationary PTO operation, and pay Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

52 Driving and Operating attention to horn chirps and/or the TAP DOWN : Press and release PTO indicator light will flash slowly CLEAN EXHAUST FILTER SEE SET− on the cruise control to indicating the previous PTO set OWNER MANUAL NOW DIC reduce the engine speed by speed has been retained in memory. warning messages. If the DIC decrements of 100 rpm. The tap message is displayed during PTO down engine speed decrements can Press and release +RES on the operation, see Diesel Particulate be adjusted by the GM Service Tool. cruise control to resume the Filter 0 22 for information on how to In Remote Mode use Set 1 Switch previous PTO set speed. clean or regenerate the DPF. to reduce engine speed. Adjustment TAP UP : Press and release +RES of tap down engine speed on the cruise control to increase the PTO Operational Speed decrements can be done through engine speed by increments of 100 Control vehicle personalization. rpm. The tap up engine speed Variable PTO operational speed COAST : Press and hold SET− on increments can be adjusted by the control provides the following the cruise control to reduce the rpm GM Service Tool. In Remote Mode functions: at 148 rpm/sec until the desired use Set 2 Switch to increase engine Cruise Control SET− (In-Cab) or engine speed is reached or until the speed. Adjustment of tap down Remote PTO Set 1 Switch initial PTO Standby Speed is engine speed increments can be reached. Use Set 1 Switch in done through vehicle SET : When PTO is engaged press Remote Mode. The speed change personalization. and hold the accelerator to obtain will happen after three seconds of ACCEL : Press and hold +RES on the desired engine speed, then holding SET− or Set 1 switch. press and release SET− on the the cruise control to increase the cruise control. The current engine In-Cab Cruise Control +RES or rpm by 148 rpm/sec until the speed will be maintained. This Remote PTO Set 2 Switch desired engine speed is reached or action can be repeated as desired RESUME : After a PTO set speed until the maximum allowable PTO to capture a higher rpm value. The has been met, a Resume Speed set speed is reached. The speed PTO set speed cannot exceed 3100 message is retained, after applying change will happen after rpm, or the PTO Max Engine Speed three seconds of holding +RES or the brake pedal or pressing * on configured. Set 2 switch. Alternatively, the the cruise control . Engine speed engine speed acceleration can be will reduce to basic idle speed. The adjusted by the GM Service Tool. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 53 Factory Preset Parameters The following table lists the factory preset parameters. These may be altered by the GM Service Tool to configure the various PTO features. Programmable Factory Setting Minimum Value Maximum Value Parameters PTO Option Configuration VEHICLE STATIONARY, VEHICLE STATIONARY, PRESET SPEED PRESET SPEED VEHICLE STATIONARY, VARIABLE SPEED VEHICLE MOBILE, VARIABLE SPEED PTO Control In-Cab PTO Mode In-Cab PTO Mode, Remote PTO Mode, Operator In-Cab Selectable Mode (OSIM) Type of Set Switch MOMENTARY MOMENTARY LATCHING Operation PTO SET 1 Engine Speed DISABLED DISABLED ENABLED After PTO On Interlock or Redundant DISABLED DISABLED ENABLED Emergency Stop Feedback Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

54 Driving and Operating

Programmable Factory Setting Minimum Value Maximum Value Parameters Keep PTO Clutch Engaged ENABLED DISABLED ENABLED during Braking or upon Pressing * Action after Brake Is RETURN TO BASE RETURN TO BASE RETURN TO Released IDLE rpm IDLE rpm STANDBY rpm Max. vehicle speed may be limited to 40 km/h (25 mph) if this is programmed with the GM Service Tool. After reverting back to RETURN TO BASE IDLE rpm using the GM Service Tool, Max. vehicle speed is also to be set to required speed. Set Low Fuel Level for 15% 0% 25% Engine Shutdown Engine Run Time with PTO ENABLED DISABLED ENABLED Active Timer Engine Run Time while 420 min 10 min 3480 min PTO Is Active PTO Max. Engine Speed 2100 rpm 1100 rpm 3100 rpm Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 55

Programmable Factory Setting Minimum Value Maximum Value Parameters Min. Engine Speed for 500 rpm 500 rpm 1000 rpm PTO Engagement Max. Engine Speed for 1500 rpm 1000 rpm 1800 rpm PTO Engagement PTO Standby rpm 900 rpm 700 rpm 1500 rpm PTO Set Speed 1 1200 rpm 1100 rpm 2900 rpm PTO Set Speed 2 1900 rpm 1700 rpm 3100 rpm Engine Speed Tap Step 100 rpm 4 rpm 500 rpm Engine Speed Ramp Rate 148 rpm/s 4 rpm/s 148 rpm/s Maximum Vehicle Speed 94 km/h (58 mph) 30 km/h (19 mph) 94 km/h (58 mph) Minimum Remote 2% 0% 50% Potentiometer Threshold Maximum Remote 95% 50% 100% Potentiometer Threshold Remote Set Switch SET SPEED 1 STANDBY SPEED, SET SPEED 1, or SET SPEED 2 Transition to Low Voltage (<33% of Ignition Voltage) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

56 Driving and Operating

Programmable Factory Setting Minimum Value Maximum Value Parameters Remote Set Switch PTO STANDBY STANDBY SPEED, SET SPEED 1, or SET SPEED 2 Transition to Open State (>33% of Ignition, and <67% of Ignition Voltage) Remote Set Switch SET SPEED 2 STANDBY SPEED, SET SPEED 1, or SET SPEED 2 Transition to High Voltage (>67% of Ignition Voltage) Horn Chirps during a ENABLED DISABLED ENABLED Remote Start Event Standby Speed Menu ENABLED DISABLED ENABLED Set 1 Speed Menu ENABLED DISABLED ENABLED (In Stationary Preset) Set 2 Speed Menu ENABLED DISABLED ENABLED (In Stationary Preset) Engine Run Shutdown ENABLED DISABLED ENABLED Time Menu (In Stationary Preset) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 57

Programmable Factory Setting Minimum Value Maximum Value Parameters Engine Speed Tap ENABLED DISABLED ENABLED Step Menu (In Stationary Variable and Mobile) Remote Set Switch Speed DISABLED DISABLED ENABLED Control Remote Throttle Speed DISABLED DISABLED ENABLED Control Remote Engine Start DISABLED DISABLED ENABLED Remote Engine Shutdown DISABLED DISABLED ENABLED Throttle Override ENABLED DISABLED ENABLED Throttle Override Timer 10 Minutes 1 Minute 13 Minutes Driver Door Status Usage ENABLED DISABLED ENABLED Remote PTO In Cab DISABLED DISABLED ENABLED Control Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

58 Driving and Operating If the PTO factory preset In addition, the PTO indicator light Diesel Particulate Filter parameters do not match the will come on when all conditions Cleaning during PTO settings described above, then they required to engage PTO have not Operation may have already been altered to been met. When enabling PTO, the satisfy the requirements of the PTO indicator light will turn on, then This feature is only available on installed PTO system and body turn off after one second. Under fleet and commercial vehicles. To equipment. normal operating conditions, the verify that the vehicle has this feature, see www.gmupfitter.com to The following PTO settings are also PTO indicator light will remain on throughout the PTO operating cycle. contact the GM Upfitter Integration offered through vehicle Group. personalization, which can be Additional in-vehicle PTO module enabled by your dealer. These information can be accessed by the If equipped, this feature allows for include the following parameters: dealer. Also see the service manual manual cleaning/regeneration of the for more information. Diesel Particulate Filter (DPF) when . PTO Standby rpm it is unable to clean itself. It may be . PTO Set 1 Speed Your dealer can access Service Tool necessary to perform a manual information to determine why PTO regeneration if driving conditions — . PTO Set 2 Speed may not engage and why PTO may such as extended slow speed, . Tap Step Speed unexpectedly disengage due to stop-and-go traffic, extended idles, system conditions. . PTO Engine Run Timer short drive cycles, or stationary PTO See www.gmupfitter.com for operation — prevent DPF Driver Information Center (DIC) information on the installation of self-cleaning. Warning Messages wiring and programming for PTO Manual regeneration can only be aftermarket equipment. If the PTO indicator light does not used when the DPF has become at remain on, then not all PTO least 90% full. In PTO stationary enabling conditions have been met. session when DPF is in this One or more DIC messages may condition, one minute of horn chirps display if the PTO will not engage is initiated as a warning to the and the appropriate action must be operator to look for the DIC taken. message and take action for Manual Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Driving and Operating 59 Regeneration. At 100% full, it will attempt to automatically self-clean if proper driving conditions are met. The DPF will clean itself if the vehicle can be driven above 50 km/h (30 mph) for about 30 minutes. Manual regeneration can be used during a stationary PTO session. However it is strongly recommended that the exhaust filter be cleaned before continuous PTO. If manual regeneration is operating concurrently with PTO then the PTO system will retain control of the engine speed. Low PTO engine speeds will cause regeneration to take longer. To initiate a manual DPF regeneration, see “Manual Regeneration of Diesel Particulate Filter” under Diesel Particulate Filter. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

60 Vehicle Care General Information GM Accessories are designed to Vehicle Care complement and function with other Accessories and systems on the vehicle. See your General Information dealer to accessorize the vehicle Modifications using genuine GM Accessories Accessories and installed by a dealer technician. Modifications ...... 60 Adding non-dealer accessories or making modifications to the vehicle See the warranty manual. Vehicle Checks can affect vehicle performance and Engine Compartment safety, including such things as Aftermarket Engine Overview ...... 62 airbags, braking, stability, ride and Performance Enhancement Engine Oil ...... 63 handling, emissions systems, Products and Modifications Engine Oil Life System ...... 66 aerodynamics, durability, and Automatic Transmission Some aftermarket engine electronic systems like antilock performance products and Fluid ...... 66 brakes, traction control, and stability Engine Air Filter Life System . . . 66 modifications promise a way to control. These accessories or increase the horsepower and torque Engine Air Cleaner/Filter ...... 67 modifications could even cause Cooling System (Engine) ...... 69 levels of the vehicle's powertrain. malfunction or damage not covered You should be aware that these Cooling System (Low by the vehicle warranty. Temperature Cooling products could have harmful effects Circuit) ...... 72 Damage to vehicle components on the performance and life of the Engine Overheating ...... 74 resulting from modifications or the engine, exhaust emission system, Engine Fan ...... 76 installation or use of non-GM transmission, and drivetrain. The certified parts, including control engines, transmissions, and Electrical System module or software modifications, is drivetrains have been designed and Engine Compartment Fuse not covered under the terms of the built to offer industry leading Block ...... 77 vehicle warranty and may affect durability and performance in the most demanding applications. Appearance Care remaining warranty coverage for affected parts. Engine power enhancement Exterior Care ...... 78 products may enable the engine to operate at horsepower and torque Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 61 levels that could damage, create failure, or reduce the life of the engine, engine emission system, transmission, and drivetrain. Damage, failure, or reduced life of the engine, transmission, emission system, drivetrain, or other vehicle components caused by aftermarket engine performance enhancement products or modifications might not be covered under the vehicle warranty. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

62 Vehicle Care Vehicle Checks Engine Compartment Overview Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 63 1. Remote Negative (−) Terminal Following these simple, but { Warning 2. Remote Positive (+) Terminal important steps will help protect your investment: 3. Battery The engine oil dipstick handle . Use engine oil approved to the may be hot; it could burn you. 4. Engine Air Cleaner/Filter proper specification and of the Use a towel or glove to touch the 5. Engine Fan (Out of View) proper viscosity grade. See dipstick handle. “Selecting the Right Engine Oil” 6. Engine Oil Fill Cap in this section. 7. Engine Oil Dipstick If a low oil Driver Information Center . Check the engine oil level (DIC) message displays, check the 8. Auxiliary Battery regularly and maintain the oil level. proper oil level. See “Checking 9. Low Temperature Cooling Engine Oil” and “When to Add Follow these guidelines: Circuit Coolant Reservoir and Engine Oil” in this section. Pressure Cap . To get an accurate reading, park . Change the engine oil at the the vehicle on level ground. 10. Brake Fluid Reservoir appropriate time. See “Engine Check the engine oil level after 11. Engine Compartment Fuse Oil Life System” in the owner’s the engine has been off for at Block manual. least two hours. Checking the engine oil level on steep grades 12. Engine Coolant Surge Tank . Always dispose of engine oil or too soon after engine shutoff and Pressure Cap properly. See “What to Do with can result in incorrect readings. 13. Auxiliary Fuse Block Used Oil” in this section. Accuracy improves when 14. Windshield Washer Fluid Checking Engine Oil checking a cold engine prior to Reservoir starting. Remove the dipstick Check the engine oil level regularly, and check the level. every 650 km (400 mi), especially Engine Oil prior to a long trip. The engine oil . If unable to wait two hours, the engine must be off for at least To ensure proper engine dipstick handle is a loop. See Engine Compartment Overview 0 62 15 minutes if the engine is performance and long life, careful warm, or at least 30 minutes if attention must be paid to engine oil. for the location. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

64 Vehicle Care the engine is not warm. Pull out Selecting the Right Engine Oil the dipstick, wipe it with a clean Caution paper towel or cloth, then push it Specification Do not add too much oil. Oil back in all the way. Remove it Oils designated as API CJ-4 or again, keeping the tip down, and levels above or below the CK-4 are required for the vehicle. check the level. acceptable operating range The CJ-4 or CK-4 designation can shown on the dipstick are harmful appear either alone or in When to Add Engine Oil to the engine. If the oil level is combination with other American above the operating range (i.e., Petroleum Institute (API) the engine has so much oil that designations, such as API CJ-4/SL. the oil level gets above the These letters show API levels of cross-hatched area that shows quality. the proper operating range), the engine could be damaged. Drain the excess oil or limit driving of If the oil is below the cross-hatched the vehicle, and seek a service area at the tip of the dipstick and professional to remove the the engine has been off for at least excess oil. 15 minutes, add 1 L (1 qt) of the recommended oil and then recheck See Engine Compartment Overview the level. See Selecting the Right “ 0 62 for the location of the engine Engine Oil later in this section for ” oil fill cap. an explanation of what kind of oil to use. For engine oil crankcase Be sure to add enough oil to put the capacity, see Capacities and level somewhere in the proper Specifications 0 89. operating range. Push the dipstick all the way back in when through. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 65 American Petroleum Institute (API) When selecting an oil of the Symbol appropriate viscosity grade, always This doughnut-shaped logo select an oil of the correct (symbol) is used on most oil specification. See “Specification” containers to help you select the earlier in this section. correct oil. It means that the oil has Engine Oil Additives/Engine Oil been certified by the American Flushes — API Petroleum Institute. Do not add anything to the oil. The Look for this on the oil container, recommended oils with the API and use only those oils that display service symbol are all that is this logo. needed for good performance and engine protection. Caution Engine oil system flushes are not recommended and could cause Use only engine oils that have the engine damage not covered by the designation CJ-4 or CK-4 for the vehicle warranty. diesel engine. Failure to use the recommended oil can damage the What to Do with Used Oil DPF and result in engine damage Used engine oil contains certain not covered by the vehicle elements that can be unhealthy for warranty. your skin and could even cause cancer. Do not let used oil stay on Viscosity Grade your skin for very long. Clean your skin and nails with soap and water, Use SAE 15W-40 viscosity grade When it is very cold, below −18 °C or a good hand cleaner. Wash or engine oil. (0 °F), use SAE 5W-40 to improve properly dispose of clothing or rags cold starting. These numbers on the oil container show its viscosity, or thickness. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

66 Vehicle Care containing used engine oil. See the Automatic Transmission manufacturer's warnings about the Caution (Continued) use and disposal of oil products. Fluid warranty. Always use the correct Used oil can be a threat to the When to Check and Change automatic transmission fluid. See environment. If you change your Automatic Transmission Fluid Recommended Fluids and own oil, be sure to drain all the oil It is usually not necessary to check Lubricants 0 85. from the filter before disposal. Never the transmission fluid level. The only dispose of oil by putting it in the reason for fluid loss is a Change the fluid and filter at trash or pouring it on the ground, transmission leak or overheated into sewers, or into streams or the scheduled maintenance transmission. This vehicle is not intervals listed in Maintenance bodies of water. Recycle it by taking equipped with a transmission fluid it to a place that collects used oil. Schedule 0 81. Be sure to use the level dipstick. There is a special transmission fluid listed in procedure for checking and Engine Oil Life System Recommended Fluids and changing the transmission fluid in Lubricants 0 85. The engine oil life system calculates these vehicles. Because this engine oil life based on vehicle use procedure is difficult, this should be Engine Air Filter Life and displays the CHANGE ENGINE done at your dealer. Contact your OIL SOON message when it is time dealer for additional information or System to change the engine oil and filter. refer to the service manual for the If equipped, this feature provides procedure. The oil life system should be reset the engine air filter’s remaining life to 100% only following an oil and best timing for a change. The change. See “Engine Oil Life Caution timing to change an engine air filter System” in the owner’s manual. depends on driving and Use of the incorrect automatic environmental conditions. transmission fluid may damage the vehicle, and the damage may not be covered by the vehicle (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 67 When to Change the Engine 3. Press T on the steering wheel, How to Inspect/Replace the Air Filter or press the trip odometer reset Engine Air Cleaner/Filter When the Driver Information Center stem if the vehicle does not Do not start the engine or have the (DIC) displays a message to replace have DIC controls, to move to engine running with the engine air the engine air filter at the next oil the Reset/Disable display area. filter housing open. Before removing change, follow this timing. Select Reset, then press the the engine air filter, make sure that thumbwheel or press the reset the engine air filter housing and When the DIC displays a message stem for several seconds. nearby components are free of dirt to replace the engine air filter soon, and debris. Remove the engine air replace the engine air filter at the 4. Press the thumbwheel or the reset stem to confirm the reset. filter. Lightly tap and shake the earliest convenience. engine air filter (away from the The system must be reset after the Engine Air Cleaner/Filter vehicle) to release dust and dirt. engine air filter is changed. Inspect the engine air filter for The engine air cleaner/filter is in the damage, and replace if damaged. If the DIC displays a message to engine compartment. See Engine Do not clean the engine air filter or check the engine air filter system, Compartment Overview 0 62. components with water or see your dealer. compressed air. When changing the When to Inspect the Engine Air air filter, remove the dust valve from How to Reset the Engine Air Cleaner/Filter Filter Life System the front intake air duct and clean If the vehicle is not equipped with out any debris if necessary. To reset: the engine air filter life system, see 1. Place the vehicle in P (Park). Maintenance Schedule 0 81 for Caution intervals on inspecting and 2. Display the Air Filter Life on the replacing the engine air cleaner/ Water sprayed into or on the air DIC. See Driver Information filter. Center (DIC) 0 12 in the intake box in the engine owner’s manual. compartment may damage the air filter or electrical components. Do not spray water into or on the air intake box. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

68 Vehicle Care 3. Remove the six screws (1) 7. Turn the dust valve clockwise from the housing cover (2). to reinstall. 4. Raise the housing cover. Take 8. Clean the air cleaner/filter care not to move the air sealing surface and the cleaner/filter housing base, to housing base. avoid any air leaks. 9. Install the engine air cleaner/ 5. Remove the air cleaner/filter filter. from the housing base. Take 10. Lower the air cleaner/filter care to dislodge as little dirt as housing cover and secure with possible. the six screws. 11. Move the air duct in place and 1. Screws (6) tighten the two clamp screws. 2. Housing Cover 12. Reinstall the wiring harness 3. Electrical Connector electrical connector. 4. Clamps 13. If equipped, reset the engine To inspect and replace the filter: air filter life system after 1. Disconnect the wiring harness replacing the engine air filter. electrical connector (3) from See Engine Air Filter Life 0 the air cleaner/filter housing System 66. cover (2). 2. Loosen the screws on the { Warning clamps (4) holding the air outlet 6. Turn the dust valve Operating the engine with the air duct in place. Do not remove counterclockwise to remove cleaner/filter off can cause you or the clamps. Move the air duct from the front intake air duct. others to be burned. Use caution aside. Check it for debris and clean out if necessary. (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 69

Warning (Continued) Warning (Continued)

when working on the engine. Do leak out. That could cause an not start the engine or drive the engine fire and can burn you. Fix vehicle with the air cleaner/filter any leak before driving the off, as flames may be present if vehicle. the engine backfires. Engine Coolant The cooling system in the vehicle is Caution filled with DEX-COOL engine coolant mixture. See Recommended If the air cleaner/filter is off, dirt 1. Engine Cooling Fan (Out Fluids and Lubricants 0 85 and can easily get into the engine, of View) Maintenance Schedule 0 81. which could damage it. Always 2. Low Temperature Cooling The following explains the cooling have the air cleaner/filter in place Circuit Coolant Surge Tank when driving. system and how to add coolant and Pressure Cap when it is low. If there is a problem 3. Engine Coolant Surge Tank with engine overheating, see Engine Cooling System (Engine) and Pressure Cap Overheating 0 74. A 50/50 mixture of clean, drinkable The cooling system allows the { Warning engine to maintain the correct water and DEX-COOL coolant will: working temperature. Do not touch heater or radiator . Give freezing protection down to hoses, or other engine parts. −37 °C (−34 °F). They can be very hot and can . Give boiling protection up to burn you. Do not run the engine if 129 °C (265 °F). there is a leak; all coolant could . Protect against rust and (Continued) corrosion. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

70 Vehicle Care . Help keep the proper engine Checking Coolant temperature. Caution . Let the warning lights and Do not use anything other than a gauges work as they should. mix of DEX-COOL coolant that What to Use meets GM Standard GMW3420 and clean, drinkable { Warning water. Anything else can cause damage to the engine cooling Plain water, or other liquids such system and the vehicle, which as alcohol, can boil before the would not be covered by the proper coolant mixture will. With vehicle warranty. plain water or the wrong mixture, the engine could get too hot but Never dispose of engine coolant by there would not be an overheat putting it in the trash, or by pouring The coolant surge tank (2) is in the warning. The engine could catch it on the ground or into sewers, engine compartment on the driver fire and you or others could be streams, or bodies of water. Have side of the vehicle. See Engine burned. the coolant changed by an Compartment Overview 0 62 for authorized service center, familiar location. with legal requirements regarding Use a 50/50 mixture of clean, The vehicle must be on a level used coolant disposal. This will help drinkable water and DEX-COOL surface. When the engine is cold, protect the environment and your coolant which will not damage the coolant level should be at the health. aluminum parts. If using this indicated mark. mixture, nothing else needs to be added. If coolant has to be added more than four times a year, have your dealer check the vehicle cooling system. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 71 Adding Coolant Turn the pressure cap slowly { Warning counterclockwise about Caution one-half turn. If a hiss is heard, Steam and scalding liquids from a wait for that to stop. A hiss If coolant is changed or added, hot cooling system are under means there is still some always add enough to fill the pressure. Turning the pressure pressure left. cap, even a little, can cause them system completely or engine 2. Keep turning the pressure cap damage may occur. to come out at high speed and you could be burned. Never turn slowly, and remove it. the cap when the cooling system, If more coolant is needed, add the including the pressure cap, is hot. proper DEX-COOL coolant mixture Wait for the cooling system and at the surge tank, but be careful not pressure cap to cool. to spill it.

{ Warning If no coolant is visible in the surge tank, add coolant as follows: Spilling coolant on hot engine parts can burn you. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. 3. Slowly fill the coolant surge tank (2). Do not let the coolant 1. Remove the coolant surge tank level go above the indicated pressure cap when the cooling mark in the tank until after the system, including the coolant engine comes to operating surge tank pressure cap and temperature in Step 4. upper radiator hose, is no longer hot. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

72 Vehicle Care 4. With the coolant surge tank If the coolant level is still low after pressure cap off, start the having followed these steps twice, engine and let it run until the have the coolant system checked by engine coolant temperature a certified technician at the dealer gauge indicates approximately for a possible leak. 90 °C (195 °F). By this time, the coolant level Caution inside the coolant surge tank may be lower. If the level is If the pressure cap is not tightly lower, slowly add more of the installed, coolant loss and engine proper mixture to the coolant damage may occur. Be sure the surge tank until it reaches the cap is properly and tightly indicated mark. secured. 1. Engine Cooling Fan (Out 5. Replace the pressure cap. of View) 2. Low Temperature Cooling Be sure the pressure cap is Cooling System (Low Circuit Coolant Surge Tank locked. Temperature Cooling and Pressure Cap 6. Verify coolant level after the Circuit) 3. Engine Coolant Surge Tank engine is shut off and the The cooling system allows the and Pressure Cap coolant is cold. If necessary, diesel fuel and diesel emission fluid repeat coolant fill procedure injector to maintain the correct { Warning Steps 1 6. – working temperature. Do not touch heater or radiator hoses, or other engine parts. They can be very hot and can burn you. Do not run the engine if there is a leak; all coolant could (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 73 . Protect against rust and If coolant has to be added more Warning (Continued) corrosion. than four times a year, have your . Help keep the proper engine dealer check the vehicle charge air leak out. That could cause an cooling system. engine fire and can burn you. Fix temperature. any leak before driving the . Let the warning lights and Caution vehicle. gauges work as they should. What to Use Do not use anything other than a Low Temperature Cooling mix of DEX-COOL coolant that Circuit Coolant { Warning meets GM Standard GMW3420 and clean, drinkable The low temperature cooling circuit water. Anything else can cause cooling system in the vehicle is filled Plain water, or other liquids such damage to the engine cooling with DEX-COOL engine coolant as alcohol, can boil before the system and the vehicle, which mixture. See Recommended Fluids proper coolant mixture will. With and Lubricants 0 85 and plain water or the wrong mixture, would not be covered by the Maintenance Schedule 0 81. the engine could get too hot but vehicle warranty. there would not be an overheat The following explains the cooling warning. The engine could catch system and how to add coolant Never dispose of engine coolant by when it is low. If there is a problem fire and you or others could be putting it in the trash, or by pouring with engine overheating, see Engine burned. it on the ground or into sewers, Overheating 0 74. streams, or bodies of water. Have Use a 50/50 mixture of clean, the coolant changed by an A 50/50 mixture of clean, drinkable authorized service center, familiar water and DEX-COOL coolant will: drinkable water and DEX-COOL coolant which will not damage with legal requirements regarding . Give freezing protection down to aluminum parts. If using this used coolant disposal. This will help −37 °C (−34 °F). mixture, nothing else needs to be protect the environment and your health. . Give boiling protection up to added. 129 °C (265 °F). Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

74 Vehicle Care Checking Coolant have the system checked for leaks and purged of air, and the coolant Caution level adjusted. Do not run the engine if there is a Engine Overheating leak in the engine cooling system. This can cause a loss of all There is an engine coolant coolant and can damage the temperature gauge on the system and vehicle. Have any instrument cluster. See the owner’s leaks fixed right away. manual. If Steam Is Coming from the If No Steam Is Coming from Engine Compartment the Engine Compartment A Driver Information Center (DIC) { Warning The low temperature cooling circuit message, along with a low coolant condition, can indicate a serious coolant surge tank (1) is in the Steam and scalding liquids from a problem. engine compartment on the driver hot cooling system are under side of the vehicle. See Engine pressure. Turning the pressure If there is an engine overheat 0 Compartment Overview 62 for cap, even a little, can cause them warning and the vehicle does not location. to come out at high speed and have a low coolant condition, and The vehicle must be on a level you could be burned. Never turn no steam is heard or seen, the surface. When the engine is cold, the cap when the cooling system, problem may not be too serious. Sometimes the engine can get a the coolant level should be at the including the pressure cap, is hot. little too hot when the vehicle: indicated mark. Wait for the cooling system and . Climbs a long hill on a hot day. Adding Coolant pressure cap to cool. . Stops after high-speed driving. If the coolant level in the low temperature cooling circuit coolant . Idles for long periods in traffic. surge tank is low, see your dealer to Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 75 . Tows a trailer. See “Driving on If there is still no sign of steam and If the DIC messages display after Grades” under “Driving the vehicle is equipped with an the vehicle has been stopped and Characteristics and Towing Tips” engine driven cooling fan, push placed in P (Park) with the engine in the owner’s manual. down the accelerator until the still running, remain in the vehicle If the DIC message comes on with engine speed is about twice as fast with the engine running until these no sign of steam, try this for a as normal idle speed for at least messages no longer display. It may minute or so: five minutes while the vehicle is take up to 15 minutes of idling. Do parked. If the warning is still there, not park the vehicle in an enclosed 1. In heavy traffic, let the engine turn off the engine and get everyone area if the messages display. idle in N (Neutral) while out of the vehicle until it cools down. stopped. If it is safe to do so, If the system determines that the pull off the road, shift to If the Action Required - Idle Vehicle engine should be restarted and the P (Park) or N (Neutral), and let To Cool Engine DIC message ignition is turned off, the engine will the engine idle. displays, do not turn the engine off. turn off and then automatically Keep the engine running until the restart. If the engine is restarted, 2. Turn on the heater to full hot at message goes away. DIC messages display and chimes the highest fan speed and will sound. The vehicle cannot be open the window as necessary. Intended Vehicle Use: After a shifted out of P (Park) unless the Heavy Towing Event If the vehicle no longer has the feature is overridden. overheat warning, the vehicle can If equipped, when the vehicle is Never leave occupants in the be driven. Just to be safe, drive turned off after towing heavy loads, vehicle, and always take the keys slower for about 10 minutes. If the the system may automatically and lock the doors if you must leave warning does not come back on, restart the engine. A chime will the vehicle idling. Some local laws drive normally and have the cooling sound and DIC messages will prohibit a vehicle from idling system checked for proper fill and display. The engine will unattended. Always remain with the function. automatically turn off after 10– vehicle until it automatically turns 15 minutes of run time or if enough If the warning continues, pull over, off. This could take up to cooling has occurred. stop, and park the vehicle 15 minutes. right away. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

76 Vehicle Care If the system determines that the Interactions with Manual In most everyday driving conditions, vehicle was not allowed to restart, Regen the fan is spinning slower and the or if a condition such as an open clutch is not fully engaged. This hood has been detected, then DIC If the system has determined that improves fuel economy and reduces messages display and a chime will the engine should be restarted, then fan noise. Under heavy vehicle sound. To help with system the manual regen feature will not be loading, trailer towing, and/or high performance, either restart the allowed. outside temperatures, the fan speed engine, or if the engine is not If manual regen has been enabled, increases as the clutch more fully running and the hood can be safely and the system has determined that engages, so an increase in fan opened after one minute, open the the engine should be restarted, noise may be heard. This is normal hood to allow cooling. there will be no chime or DIC and should not be mistaken as the If the system has automatically messages related to the Diesel transmission slipping or making restarted the engine, the vehicle Engine After Run Feature until the extra shifts. It is merely the cooling cannot move until cooling has manual regen completes. If the system functioning properly. The fan completed and the engine engine is turned off during the will slow down when additional automatically turns off. Overriding manual regen, a restart may occur cooling is not required and the this feature will allow normal vehicle without any alerts. clutch partially disengages. operation. To override, start the This fan noise may be heard when vehicle as you would normally. Then Engine Fan starting the engine. It will go away either drive the vehicle as normal or The vehicle has a clutched engine as the fan clutch partially turn off the ignition if you must exit cooling fan. When the clutch is disengages. the vehicle. Opening the hood will engaged, the fan spins faster to prevent the restart or will turn the provide more air to cool the engine. engine off when this feature is active. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Vehicle Care 77 Auxiliary Fuse Block Electrical System Caution Engine Compartment Spilling liquid on any electrical Fuse Block component on the vehicle may damage it. Always keep the For additional fuse and electrical covers on any electrical information, see “Electrical System” component. in the owner’s manual. The Auxilary fuse block is in the A fuse puller is available in the left engine compartment, on the driver instrument panel end cap. side of the vehicle. The vehicle may not be equipped with all the fuses, relays, and features shown.

{ Danger Fuses Usage 7 Powertrain sensor Fuses and circuit breakers are marked with their ampere rating. 8 — Do not exceed the 9 Diesel exhaust fluid specified amperage rating when control replacing fuses and circuit 10 Fuel heater breakers. Use of an oversized fuse or circuit breaker can result 11 Smart sensors Lift the cover to access the fuse in a vehicle fire. You and others 12 SCRPM could be seriously injured or block. 13 100 watt pump/— killed. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

78 Vehicle Care Relays Usage Appearance Care 1 Diesel exhaust fluid control Exterior Care 2 Fuel heater See the owner’s manual for additional exterior care information. 3 100 watt pump (LD) Caution 4 Powertrain sensor (LD) Water sprayed into or on the air 5 Cooling fan intake box in the engine clutch (HD) compartment may damage the air filter or electrical components. Do 6 Powertrain not spray water into or on the air sensor (HD) intake box. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Service and Maintenance 79 General Information Your dealer recognizes the Service and importance of providing Maintenance This maintenance section applies to competitively priced maintenance vehicles with a diesel engine. For and repair services. With trained gasoline engine vehicles, see the technicians, your dealer is the place General Information maintenance schedule section in for routine maintenance such as oil General Information ...... 79 the owner’s manual. 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 ...... 81 the required maintenance for the blades. Recommended Fluids, vehicle. Follow this schedule to help Lubricants, and Parts protect against major repair Caution expenses resulting from neglect or Recommended Fluids and Damage caused by improper Lubricants ...... 85 inadequate maintenance. It may maintenance can lead to costly Maintenance Replacement also help to maintain the value of repairs and may not be covered Parts ...... 86 the vehicle if it is sold. It is the responsibility of the owner to have by the vehicle warranty. Maintenance Records all required maintenance performed. Maintenance intervals, checks, Maintenance Records ...... 87 Your dealer has trained technicians inspections, recommended fluids, who can perform required and lubricants are important to maintenance using genuine keep the vehicle in good working replacement parts. They have condition. up-to-date tools and equipment for Do not have chemical flushes that fast and accurate diagnostics. Many are not approved by GM dealers have extended evening and performed on the vehicle. The Saturday hours, courtesy use of flushes, solvents, cleaners, transportation, and online or lubricants that are not scheduling to assist with service needs. (Continued) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

80 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 0 repairs that are not covered by Fuel for Diesel Engines 30. serious injury. Perform the vehicle warranty. Refer to the information in the maintenance work only if the Maintenance Schedule Additional required information, proper tools, The Tire Rotation and Required Required Services - Normal chart. and equipment are available. Services are the responsibility of the The Additional Required Services - If they are not, see your dealer to vehicle owner. It is recommended to Severe are for vehicles that are: have a trained technician do the have your dealer perform these work. See “Doing Your Own . Mainly driven in heavy city traffic services every 12 000 km/7,500 mi. Service Work” in the owner’s in hot weather. Proper vehicle maintenance helps to manual. keep the vehicle in good working . Mainly driven in hilly or condition, improves fuel economy, mountainous terrain. and reduces vehicle emissions. . Frequently towing a trailer. Because of the way people use . Used for high speed or vehicles, maintenance needs vary. competitive driving. There may need to be more frequent checks and services. The . Used for taxi, police, or delivery Additional Required Services - service. Normal are for vehicles that: Refer to the information in the . Carry passengers and cargo Maintenance Schedule Additional within recommended limits on Required Services - Severe chart. the Tire and Loading Information label. See “Vehicle Load Limits” in the owner’s manual. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Service and Maintenance 81 Maintenance filter must be changed at least once Power Take Off (PTO) and a year and the oil life system must Extended Idle Use Schedule be reset. Your trained dealer technician can perform this work. When the vehicle is used with the Owner Checks and Services If the engine oil life system is reset PTO equipment or used in a way that requires extended idle time, See the owner s manual for other accidentally, service the vehicle ’ one hour of use shall be deemed services and intervals that may be within 5 000 km/3,000 mi since the the same as 53 km (33 mi). See required. last service. Reset the oil life system when the oil is changed. Driver Information Center (DIC) for At Each Fuel Stop See Engine Oil Life System 0 66. hourmeter, if equipped. . Check DEF percentage. See Engine Air Filter Change Required Services Every Diesel Exhaust Fluid 0 25. 12 000 km/7,500 mi When the REPLACE AT NEXT OIL . Check the engine oil level. See CHANGE message displays, the . Check engine oil level and oil Engine Oil 0 63. engine air filter should be replaced life percentage. If needed, Engine Oil Change at the next engine oil change. When change engine oil and filter, and the REPLACE ENGINE AIR FILTER reset oil life system. 0 When the CHANGE ENGINE OIL SOON message displays, the See Engine Oil 63 and 0 SOON message displays, have the engine air filter should be replaced Engine Oil Life System 66. engine oil and filter changed within at the earliest convenience. Reset the next 1 000 km/600 mi. If driven the engine air filter life system after under the best conditions, the the engine air filter is replaced. See engine oil life system may not Engine Air Filter Life System 0 66. indicate the need for vehicle service for up to a year. The engine oil and Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

82 Service and Maintenance . If equipped with the engine air . Check engine coolant level. See . Visually inspect exhaust system filter life system, check the air Cooling System (Engine) 0 69 or and nearby heat shields for filter life percentage. Cooling System (Low loose or damaged parts. If necessary, replace the engine Temperature Cooling Circuit) air filter and reset the engine air 0 72. filter life system. See Engine Air . Visually check for fluid leaks. Filter Life System 0 66. If the vehicle is not equipped with the . Visually inspect fuel system for engine air filter life system, damage or leaks. inspect the engine air cleaner filter. See Engine Air Cleaner/ Filter 0 67. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Service and Maintenance 83

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

Perform Required Services. Check engine oil level and oil life percentage. Change engine oil and filter, if needed. Check engine air filter life per- @@@@@@@@@@@@@@@@@@@@ centage and status. Change engine air filter, if needed If the vehicle is not equipped with the engine air filter life system, replace engine air cleaner @ @ @ filter. (1) Drain and fill engine cooling system. (2) @ Visually inspect accessory drive belts. (3) @ Replace fuel filter. (4) @ @ @ @ @ @

Footnotes — Maintenance (2) Or every five years, whichever (4) Or every two years, or when the Schedule Additional Required comes first. See Cooling System CHANGE FUEL FILTER message in Services - Normal (Engine) 0 69 or the Driver Information Center (DIC) Cooling System (Low Temperature comes on, whichever comes first. (1) Or every four years, whichever 0 comes first. If driving in dusty Cooling Circuit) 72. The fuel filter may need to be conditions, inspect the filter at each (3) Or every 10 years, whichever replaced more often based on oil change or more often as needed. comes first. Inspect for fraying, biodiesel usage, driving in climates See Engine Air Cleaner/Filter 0 67. excessive cracking, or damage; with severe dust, off-road driving, replace, if needed. or towing a trailer for extended periods. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

84 Service and Maintenance

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

Perform Required Services. Check engine oil level and oil life percentage. Change engine oil and filter, if needed. Check engine air filter life per- @@@@@@@@@@@@@@@@@@@@ centage and status. Change engine air filter, if needed. If the vehicle is not equipped with the engine air filter life system, replace engine air cleaner @ @ @ filter. (1) Change automatic transmission fluid and filter. @ @ @ Drain and fill engine cooling system. (2) @ Visually inspect accessory drive belts. (3) @ Replace fuel filter. (4) @ @ @ @ @ @

Footnotes — Maintenance (2) Or every five years, whichever (4) Or every two years, or when the Schedule Additional Required comes first. See Cooling System CHANGE FUEL FILTER message in Services - Severe (Engine) 0 69 or the Driver Information Center (DIC) Cooling System (Low Temperature comes on, whichever comes first. (1) Or every four years, whichever 0 comes first. If driving in dusty Cooling Circuit) 72. The fuel filter may need to be conditions, inspect the filter at each (3) Or every 10 years, whichever replaced more often based on oil change or more often as needed. comes first. Inspect for fraying, biodiesel usage, when driving in See Engine Air Cleaner/Filter 0 67. excessive cracking, or damage; climates with excessive dust, replace, if needed. or when off-road driving or towing a trailer for extended periods. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Service and Maintenance 85 Recommended Fluids, Lubricants, and Parts Recommended Fluids and Lubricants The following fluids apply to vehicles with a Duramax diesel engine. For other fluids not listed here, see “Recommended Fluids and Lubricants” in the owner’s manual. Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer. Usage Fluid/Lubricant Automatic Transmission DEXRON ULV Automatic Transmission Fluid (GM Part No. 19352619, in Canada 19352620). Diesel Exhaust Aftertreatment Diesel Exhaust Fluid (GM Part No. 19286291, in Canada 88862660) or System Diesel Exhaust Fluid that meets ISO 22241 or displays the API Diesel Exhaust Fluid Certification Mark. Engine Coolant 50/50 mixture of clean, drinkable water and use only DEX-COOL coolant. See Cooling System (Engine) 0 69 or Cooling System (Low Temperature Cooling Circuit) 0 72. Engine Oil Engine oils with the letters CJ-4 or CK-4 are required for your vehicle. The CJ-4 or CK-4 designation can appear either alone or in combination with other American Petroleum Institute (API) designations, such as API CJ-4/ SL. These letters show API levels of quality. To determine the preferred viscosity for your vehicle's diesel engine, see Engine Oil 0 63. Hydraulic Power Steering System GM Power Steering Fluid (GM Part No. 19329450, in Canada 19329451). Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

86 Service and Maintenance Maintenance Replacement Parts Replacement parts identified below by name, part number, or specification can be obtained from your dealer. Part GM Part Number ACDelco Part Number Engine Air Cleaner/Filter 84554703 A3248C Fuel Filter 23304096 TP1015 Engine Oil Filter 12684038 PF26 Use only the specified filters. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Service and Maintenance 87 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 Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

88 Technical Data Technical Data

Vehicle Data Capacities and Specifications ...... 89 Engine Drive Belt Routing . . . . . 91 Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Technical Data 89 Vehicle Data Capacities and Specifications The following approximate capacities are given in metric and English conversions. See Recommended Fluids and Lubricants 0 85. Capacities Application Metric English Engine Cooling System* 29.1 L 30.7 qt Low Temperature Cooling Circuit Cooling System* 3.5 L 3.7 qt Diesel Exhaust Fluid (DEF) Tank** 26.5 L 7.0 gal Engine Oil with Filter 9.5 L 10.0 qt Transfer Case Fluid 1500 Series 1.5 L 1.6 qt 2500 Series and 3500 Series 2.3 L 2.4 qt Hydraulic Power Steering Fluid 2.0 L 2.1 qt *Engine cooling system capacity values are based on the entire cooling system and its components. **Do not overfill the DEF tank. See Diesel Exhaust Fluid 0 25. All quantities are approximate. When adding, be sure to fill to the appropriate level, as recommended in this manual. Recheck fluid level after filling. Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

90 Technical Data Engine Specifications Engine VIN Code Type 6.6L 8-Cylinder Turbo Diesel (L5P Engine) Y V8 Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Technical Data 91 Engine Drive Belt Routing

6.6L 8-Cylinder Engine (Dual Generator) 6.6L 8-Cylinder Engine (Single Generator)

Fan Drive Belt Routing (Secondary/Auxiliary Drive) Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

92 Index Index A D Accessories and Modifications . . . 60 Diesel Air Cleaner/Filter, Engine ...... 67 Starting Your Engine ...... 15 Air Filter Diesel Exhaust Fluid ...... 25 Life System ...... 66 Diesel Exhaust Fluid (DEF) Appearance Care Warning Light ...... 11 Exterior ...... 78 Diesel Particulate Filter ...... 22 Automatic Drive Belt Routing, Engine ...... 91 Transmission Fluid ...... 66 Driver Information B Center (DIC) ...... 12 Biodiesel ...... 31 E Brake Electrical System Exhaust ...... 29 Engine Compartment Fuse C Block ...... 77 Engine Canadian Vehicle Owners ...... 2 Air Cleaner/Filter ...... 67 Capacities and Specifications . . . . 89 Check Light (Malfunction Check Indicator) ...... 10 Engine Light (Malfunction Compartment Overview ...... 62 Indicator) ...... 10 Cooling System ...... 69, 72 Cleaning Drive Belt Routing ...... 91 Exterior Care ...... 78 Fan ...... 76 Cluster, Instrument ...... 6 Heater ...... 21 Cold Weather Operation ...... 32 Oil Life System ...... 66 Cooling System ...... 69, 72 Overheating ...... 74 Covers Starting Your Diesel ...... 15 Winter ...... 18 Engine Air Filter Life System . . . . . 66 Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

Index 93 Engines Fuses Maintenance Schedule (cont'd) Diesel Fuel ...... 30 Engine Compartment Fuse Recommended Fluids and Exhaust Brake ...... 29 Block ...... 77 Lubricants ...... 85 Malfunction Indicator Lamp ...... 10 Exhaust Fluid G Diesel ...... 25 General Information O F Service and Maintenance ...... 79 Oil Engine ...... 63 Fan H Engine ...... 76 Engine Oil Life System ...... 66 Heater Filter ...... 22 Overheating, Engine ...... 74 Engine ...... 21 Replacement (Fuel) ...... 36 P Filter, I Parking Engine Air Cleaner ...... 67 Instrument Cluster ...... 6 Over Things That Burn ...... 22 Fluid Introduction ...... 2 Personalization Automatic Transmission ...... 66 L Vehicle ...... 13 Fuel Lamps Power Take-Off (PTO) ...... 41 Additives ...... 30 Malfunction Indicator (Check Power Take-Off Light ...... 12 Biodiesel ...... 31 Engine) ...... 10 R Cold Weather Operation ...... 32 Lights Recommended Fluids and Diesel Engines ...... 30 Check Engine (Malfunction Lubricants ...... 85 Filling a Portable Fuel Indicator) ...... 10 Records Container ...... 39 Diesel Exhaust Fluid (DEF) . . . . . 11 Maintenance ...... 87 Filling the Tank ...... 37 Power Take-off ...... 12 Replacement Parts Filter Replacement ...... 36 Wait to Start ...... 11 Running out of Fuel ...... 36 Maintenance ...... 86 Top Tier ...... 30 M Routing, Engine Drive Belt ...... 91 Water in Fuel ...... 33 Maintenance Running out of Fuel ...... 36 Fuel for Diesel Engines ...... 30 Records ...... 87 Maintenance Schedule ...... 81 Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing- U.S./Canada-13337828) - 2020 - CRC - 4/17/19

94 Index S Vehicle (cont'd) Service Personalization ...... 13 Accessories and W Modifications ...... 60 Wait to Start Light ...... 11 Maintenance Records ...... 87 Water in Fuel ...... 33 Maintenance, General Winter Cover ...... 18 Information ...... 79 Specifications and Capacities . . . . 89 Starting the Diesel Engine ...... 15 Supplement Using ...... 2 System Engine Air Filter Life ...... 66 T Top Tier Fuel ...... 30 Towing Trailer ...... 39 Trailer Towing ...... 39 Transmission Fluid, Automatic ...... 66 U Using This Supplement ...... 2 V Vehicle Canadian Owners ...... 2 20_MUL_6.6L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458631A_2019APR11.ai 1 3/21/2019 11:06:49 AM

MY 6.6L Duramax Diesel

CY CMY Engine Supplement K

84458631 A