18_MUL_Duramax_Diesel_Supplement_COV_en_US_23380346C_2018MAR29.ai 1 3/22/2018 12:50:21 PM

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23380346 C Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Contents Introduction ...... 2 In Brief ...... 5 Instruments and Controls ...... 9 Driving and Operating ...... 24 Vehicle Care ...... 84 Service and Maintenance . . . . . 120 Technical Data ...... 130 Index ...... 134 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 3/23/18

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

Litho in U.S.A. Part No. 23380346 C Third Printing © 2018 General Motors LLC. All Rights Reserved. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Introduction 3 Using this Supplement This supplement contains information specific to the unique components of the vehicle. It does 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. 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 Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

4 Introduction 2 NOTES Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

In Brief 5 Initial Drive For areas where ambient In Brief temperatures are below −40 °C Information (−40 °F), use synthetic transmission Initial Drive Information fluid approved to Allison Transmission specification TES-295. Transmission ...... 5 Transmission See Recommended Fluids and Performance and Maintenance Cold Operation (8-Cylinder Pickup Lubricants 0 126 and Automatic Engine Oil Life System ...... 6 Models Only) Transmission Fluid 0 95. Diesel Particulate Filter ...... 6 When temperatures are very cold, Adaptive Shift Controls Diesel Exhaust Fluid ...... 7 the transmission will prevent certain (8-Cylinder Pickup Models Only) operations to protect against damage. The information below The shift quality of a new vehicle shows shift range availability based may not be ideal because the on transmission oil temperature: Adaptive Shift Control process may not have determined the best . All shift ranges available at settings for a particular shift or −25 °C (−13 °F) or above. condition. Shift quality will improve . 2 (Second) and 3 (Third) shift with continued driving. ranges only at −35 °C (−31 °F) to Low Traction Mode (All Models) −25 °C (−13 °F). Low Traction Mode aids in vehicle . 2 (Second) shift range only at acceleration on slippery road −35 °C (−31 °F) or lower. surfaces such as ice or snow. By Torque converter clutch operation selecting 2 (Second) using Range will also be prevented when air or Selection Mode while at a stop, the transmission oil temperatures are transmission will limit torque to the below certain levels. drive wheels to prevent slippage. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

6 In Brief Heater Performance Mode Performance and temperature. This feature has been (8-Cylinder Pickup Models Only) designed to operate automatically, When cold weather conditions are Maintenance with limited operator involvement or detected, the transmission raises awareness. part throttle upshift points after the Engine Oil Life System Noise may be heard at low speeds 1 (First) to 2 (Second) upshift to The engine oil life system calculates when the emission controls are increase engine speed. This feature engine oil life based on vehicle use active. This is normal. shortens engine and cab warm up and displays the CHANGE ENGINE times. Cleaning the DPF (Exhaust OIL SOON message when it is time Filter) When the transmission is in this to change the engine oil and filter. mode, upshifts may be delayed. The oil life system should be reset While the DPF cleaning is This is normal and does not indicate to 100% only following an oil automatically controlled by the an operational problem. change. See “Engine Oil Life engine computer, the Driver System” in the owner’s manual. Information Center (DIC) may Four-Wheel Drive (8-Cylinder display a message. The vehicle will Pickup Models Only) Diesel Particulate Filter need to operate continuously until When operating in 4 the message is no longer displayed. n The Duramax engine is equipped Cleaning occurs most effectively (Four-Wheel-Drive Low), there is a with a Diesel Particulate Filter (DPF) above 50 km/h (30 mph). If the very deep gear reduction. The that will filter or trap particulates. vehicle is returned to idle during the resulting shifts will feel exaggerated. The DPF is under the vehicle in the cleaning process, the driver may exhaust system. notice a slightly different sound or a Depending on a number of factors slightly elevated engine idle speed. monitored by the engine computer, This is normal. No action is required the DPF will need to be cleaned of on the part of the driver during a accumulated solids. When a regular DPF cleaning. See Diesel cleaning is needed, the engine Particulate Filter 0 34. computer will initiate a cleaning action by warming the exhaust gas Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

In Brief 7 Special DPF Driver Messages Fuel In addition: If the vehicle is used for numerous Use Ultra Low Sulfur Diesel . Use the correct engine oil. short trips or extended slow-speed Fuel (ULSD) . Do not add gasoline to operation, the engine computer may diesel fuel. not be able to adequately heat up Use ULSD only. The emission the exhaust system to clean the control hardware used on the . Do not modify the induction or vehicle may be damaged by using DPF effectively. The engine exhaust systems. computer has been designed to fuel with high sulfur levels. Use only 0 fuel that is dispensed from pumps See Fuel for Diesel Engines 45 continuously monitor the condition and Engine Oil 0 91. of the DPF. When the engine bearing the ULSD label. computer detects that the DPF is Do Not Use Low Sulfur Diesel Diesel Exhaust Fluid nearly full of particulates and that Fuel (LSD) the vehicle is not being operated in Diesel Exhaust Fluid (DEF) is used Do not use fuel that is dispensed a manner that would allow effective with diesel engines to reduce the from pumps bearing the LSD label. automatic DPF cleaning, the Driver amount of regulated emissions Information Center (DIC) will display Do Not Use Non-Highway Fuel produced. The DEF system must be a message. maintained for the vehicle to run Fuel labeled as off road or properly. If the vehicle continues to be driven non-highway is typically very high in in a manner that prevents effective sulfur content and will damage the DEF is not a fuel additive. For DPF cleaning, the DPF will become emission control system. refilling instructions, see Diesel plugged with particulates. If this Non-highway fuel is not intended for Exhaust Fluid 0 37. DEF should not occurs, the engine computer will use in on-highway vehicles and be mixed with or added to diesel turn on the Malfunction Indicator does not have the fuel properties fuel. DEF freezes when exposed to Lamp (Check Engine Light) in the needed by the DPF-equipped temperatures below −11 °C (12 ° F). instrument cluster, and the DIC will Duramax diesel. display the message ENGINE POWER IS REDUCED. See Diesel Particulate Filter 0 34. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

8 In Brief Locating Diesel Exhaust Fluid DEF can be purchased at a Chevrolet or GMC dealer. It can also be purchased at authorized vehicle and truck dealerships. Additionally, some diesel truck fueling stations or retailers may have DEF for purchase. For vehicles with an active OnStar® subscription, OnStar can help to locate a DEF retailer. See “Customer Assistance Offices” in the owner manual for phone numbers to assist you in contacting a GM dealer. See Recommended Fluids and Lubricants 0 126. As the DEF tank becomes low on fluid, warnings begin with approximately 1 600 km (1,000 mi) of remaining range. These warnings will increase as the tank becomes empty. Once the tank is empty, the vehicle speed will be limited. If there is an issue with the quality of the fluid or the exhaust fluid system, warnings will be displayed in the Driver Information Center (DIC). See Diesel Exhaust Fluid 0 37. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Instruments and Controls 9 Instruments and Controls

Warning Lights, Gauges, and Indicators Instrument Cluster ...... 10 Fuel Gauge ...... 16 Engine Oil Pressure Gauge . . . . 17 Malfunction Indicator Lamp (Check Engine Light) ...... 18 Wait-to-Start Light ...... 20 Diesel Exhaust Fluid (DEF) Warning Light ...... 20 Power Take-Off Light (Chassis Cab Only) ...... 21 Information Displays Driver Information Center (DIC) ...... 21 Vehicle Personalization Vehicle Personalization (Pickup Models) ...... 22 Vehicle Personalization (Van Models) ...... 23 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

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

English Base Level 4-Cylinder Pickup Shown, Metric Similar Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Instruments and Controls 11

English Uplevel 4-Cylinder Pickup Shown, Metric Similar Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

12 Instruments and Controls

English Base Level 8-Cylinder Pickup Shown, Metric Similar Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Instruments and Controls 13

English Uplevel 8-Cylinder Pickup Shown, Metric Similar Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

14 Instruments and Controls

English 8-Cylinder Denali Pickup Shown, Metric Similar Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Instruments and Controls 15

English Van Shown, Metric Similar Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

16 Instruments and Controls See the owner’s manual for warning lights and gauges not listed in this supplement. Fuel Gauge

English Base Level 4-Cylinder English 8-Cylinder Pickup Models Pickup Shown, Uplevel Similar

Metric Base Level 4-Cylinder Pickup Shown, Uplevel Similar

Metric Van Models Metric 8-Cylinder Pickup Models Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Instruments and Controls 17 . It takes a little more or less fuel to fill up than the fuel gauge indicated. For example, the gauge may have indicated the tank was half full, but it actually took a little more or less than half the tank's capacity to fill the tank. . The gauge moves a little while turning a corner or speeding up. . The gauge does not go back to E (Empty) when the ignition is English Van Models Metric 8-Cylinder Pickup Models turned off. When the ignition is on, the fuel None of these indicate a problem gauge shows approximately how with the fuel gauge. much fuel the vehicle has left in the tank. The gauge will first indicate For information on how to fill the fuel E (Empty) before the vehicle is out tank, see Filling the Tank 0 56. of fuel, but the vehicle's fuel tank should be filled soon. Engine Oil Pressure An arrow on the fuel gauge Gauge indicates the side of the vehicle the fuel door is on. 4-Cylinder Pickup Models Listed are four situations customers See “Oil Pressure” under “Driver may experience with the fuel gauge: Information Center (DIC)” in the owner’s manual. English 8-Cylinder Pickup Models . At the gas station, the fuel pump shuts off before the gauge reads F (Full). Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

18 Instruments and Controls pressure message or light comes Caution on, check the oil level immediately. Do not operate the engine with the Lack of proper engine oil oil pressure warning light on or an maintenance can damage the ENGINE OIL LOW ADD OIL engine. Driving with the engine oil message displayed. low can also damage the engine. The repairs would not be covered Malfunction Indicator by the vehicle warranty. Check the oil level as soon as possible. Lamp (Check Engine Add oil if required, but if the oil Light) level is within the operating range This light is part of the vehicle’s Metric Van Models and the oil pressure is still low, emission control on-board have the vehicle serviced. Always diagnostic system. If this light is on follow the maintenance schedule while the engine is running, a for changing engine oil. malfunction has been detected and the vehicle may require service. The The engine oil pressure gauge light should come on to show that it reads in kPa (kilopascals) or psi is working when the ignition is on (pounds per square inch) when the with the engine not running. See engine is running. Oil pressure may “Ignition Positions” in the owner’s vary with engine speed, outside manual. temperature, and oil viscosity. This light may also come on when If readings are outside the normal the system has detected a problem operating range, the low oil with the Diesel Exhaust Fluid (DEF) management system. See Diesel English Van Models pressure message may display on 0 the Driver Information Center (DIC), Exhaust Fluid 37. or for vehicles without a DIC the oil pressure light will come on. If the oil Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Instruments and Controls 19 If the light remains on, see your Caution dealer. Modifications to the engine, Emissions Inspection and transmission, exhaust, intake, Maintenance Programs or fuel system, or the use of If the vehicle requires an Emissions replacement tires that do not Malfunctions are often indicated by Inspection/Maintenance test, the meet the original tire the system before any problem is test equipment will likely connect to specifications, can cause this light noticeable. Being aware of the light the vehicle's Data Link and seeking service promptly when to come on. This could lead to Connector (DLC). it comes on may prevent damage. costly repairs not covered by the vehicle warranty. This could also affect the vehicle s ability to pass Caution ’ an Emissions Inspection/ If the vehicle is driven continually Maintenance test. See with this light on, the emission Accessories and Modifications 0 control system may not work as 84. well, the fuel economy may be The DLC is under the instrument lower, and the vehicle may not When the light is on, a malfunction panel to the left of the steering run smoothly. This could lead to has been detected. Diagnosis and wheel. Connecting devices that are costly repairs that might not be service may be required. not used to perform an Emissions covered by the vehicle warranty. Poor fuel quality can cause Inspection/Maintenance test or to inefficient engine operation and poor service the vehicle may affect driveability, which may go away vehicle operation. See “Add-On once the engine is warmed up. Electrical Equipment” in the owner’s If this occurs, change the fuel brand. manual. See your dealer if It may require at least one full tank assistance is needed. of the proper fuel to turn the light off. See Fuel for Diesel Engines 0 45. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

20 Instruments and Controls The vehicle may not pass Wait-to-Start Light Diesel Exhaust Fluid inspection if: (DEF) Warning Light . The light is on when the engine is running. . The light does not come on when the ignition is on with the engine not running.

. Critical emission control systems This light comes on briefly while have not been completely starting the engine, as a check to This light, a Driver Information diagnosed. If this happens, the show the light is working. vehicle would not be ready for Center (DIC) message, and a chime inspection and might require If the wait-to-start light comes on, come on when there is an issue with several days of routine driving the glow plug system is required the Diesel Exhaust Fluid. before the system is ready for and operating. Wait until the light If the DEF level has not been inspection. This can happen if turns off before starting the engine. corrected, the light will continue to the 12-volt battery has recently This light may not come on in warm flash when the vehicle is started. been replaced or run down, or if temperatures. The vehicle's speed may also be the vehicle has recently been The fast warm-up glow plug system limited. serviced. makes the wait-to-start light stay on Also see Diesel Exhaust Fluid 0 37. See your dealer if the vehicle will for a shorter amount of time than not pass or cannot be made ready most diesel engines. for the test. See Starting the Diesel Engine 0 24. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Instruments and Controls 21 Power Take-Off Light Information Displays When the remaining fuel filter life is low, the CHANGE FUEL FILTER (Chassis Cab Only) message will appear on the display. Driver Information Change the fuel filter as soon as Center (DIC) possible. The DIC is in the instrument cluster. Fuel Filter Life Reset : Reset the The DIC comes on when the ignition Fuel Filter Life Remaining display is on. after each fuel filter change. It will not reset itself. Also, be careful not A Duramax diesel vehicle may have Chassis Cab to reset the display at any time other the following additional DIC menu than when the fuel filter has just The vehicle may have a Power items: Take-Off (PTO) light. Under normal been changed because it cannot be operating conditions, the PTO light Exhaust Fluid Level : The Diesel reset accurately until the next fuel will remain on throughout the PTO Exhaust Fluid (DEF) level will be filter change. The fuel filter life will operating cycle. If all conditions displayed as either OK, XX%, change to 100% when the system required to engage PTO have not or LOW. has been reset. To reset the system, been met when enabling PTO, the When LOW appears on the display, press and hold the set/reset button, PTO light will turn on, then turn off add DEF as soon as possible. See or the trip odometer reset stem if after one second. See Power Diesel Exhaust Fluid 0 37. there are no DIC buttons, for Take-Off (PTO) 0 66. two seconds while Fuel Filter Life Fuel Filter Life Remaining : This Remaining is displayed on the DIC. display shows an estimate of the fuel filter's remaining useful life. If 90% Fuel Filter Life Remaining is displayed, it means 90% of the current fuel filter life remains. The fuel filter life system will alert when to change the fuel filter on a schedule consistent with your driving conditions. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

22 Instruments and Controls Vehicle 3. Turn the MENU knob to scroll Elevated Idle to SETTINGS, then press the This allows the feature to be turned Personalization MENU knob. on and off. See “Elevated Idle” in 4. Turn the MENU knob to scroll Starting the Diesel Engine 0 24. Vehicle Personalization to Vehicle, then press the Select Off or On. (Pickup Models) MENU knob. Power Take-Off (PTO) (If Use the audio system controls to 5. Turn the MENU knob to scroll access the personalization menus to the desired menu, then Equipped) for customizing vehicle features. press the MENU knob. There may be additional features If equipped, these features may be that can be customized for the PTO. The following features may be 0 available on some vehicles with a selected using the infotainment See Power Take-Off (PTO) 66. See your dealer to enable these diesel engine. See “Vehicle display. features. Personalization” in the owner’s Vehicle manual for additional vehicle Feature Settings Menu Items personalizations. Select and the following may display: Press the MENU knob to select the System Controls desired setting. . Climate and Air Quality 1. Turn the ignition on without the . Standby Speed engine running and place the . Power Take-Off (PTO) . Set 1 Speed vehicle in P (Park). Climate and Air Quality . Set 2 Speed To avoid excessive drain on Select and the following may the battery, turn the . Tap Step Speed display: headlamps off. . Shutdown Time . Elevated Idle 2. Press the MENU knob on the Turn the MENU knob to scroll to radio. one of the following menu selections: Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Instruments and Controls 23 PTO STANDBY SPEED PTO TAP STEP SPEED features can only be programmed to This feature allows for modifying the This feature is available if the one setting on the vehicle and PTO Standby Speed. vehicle is configured for Stationary cannot be programmed to a Variable or Mobile PTO, and allows preferred setting for two different Turn the MENU knob to the desired drivers. setting. Press the MENU knob to the selection of the PTO tap step select the desired setting. speed. A Duramax diesel vehicle may have Turn the MENU knob to the desired the following additional vehicle PTO SET 1 SPEED PTO Tap Step Speed setting. Press personalization items: This feature is available if the the MENU knob to select the Feature Settings Menu Items vehicle is configured for Stationary desired setting. Preset PTO, and allows the The following are customization selection of the PTO set 1 speed. PTO SHUTDOWN TIME features that allow you to program settings to the vehicle: Turn the MENU knob to the desired This feature is available if the PTO Standby Set 1 setting. Press vehicle is configured for Stationary ELEVATED IDLE Preset or Stationary Variable PTO, the MENU knob to select the This feature allows you to turn on or desired setting. and allows the selection of the PTO shutdown time. off Elevated Idle. PTO SET 2 SPEED Turn the MENU knob to the desired Press U until ELEVATED IDLE This feature is available if the PTO Shutdown Time setting. Press appears on the DIC display. vehicle is configured for Stationary the MENU knob to select the Press V once to access the settings Preset PTO, and allows the desired setting. for this feature. Then press U to selection of the PTO set 2 speed. scroll through OFF, ON, or NO Turn the MENU knob to the desired Vehicle Personalization CHANGE. To select a setting, press PTO Standby Set 2 setting. Press (Van Models) V while the desired setting is the MENU knob to select the This vehicle may have displayed on the DIC. desired setting. customization capabilities that allow you to program certain features to one preferred setting. Customization Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

24 Driving and Operating Running Out of Fuel ...... 53 Starting and Driving and Fuel Filter Replacement ...... 54 Operating Filling the Tank ...... 56 Operating Filling a Portable Fuel Container ...... 58 Starting the Diesel Starting and Operating Trailer Towing Engine Starting the Diesel Engine . . . . . 24 Trailer Towing ...... 58 Winter Cover ...... 27 The diesel engine starts differently Engine Heater ...... 31 Conversions and Add-Ons than a gasoline engine. Fuel Operated Heater (FOH) Power Take-Off (PTO) ...... 66 (Van Models Only) ...... 33 Caution Parking over Things That Burn ...... 34 If the steering wheel is turned until it reaches the end of its Diesel Particulate Filter travel, and is held in that position Diesel Particulate Filter ...... 34 while starting the vehicle, damage Diesel Exhaust Fluid may occur to the hydraulic power Diesel Exhaust Fluid ...... 37 steering system and there may be loss of power steering assist. Brakes Exhaust Brake ...... 44 Move the shift lever to P (Park) or Fuel N (Neutral). To restart the engine Fuel for Diesel Engines ...... 45 when the vehicle is already moving, What Fuel to Use in use N (Neutral) only. the U.S...... 46 What Fuel to Use in Canada . . . 47 Biodiesel ...... 47 Cold Weather Operation ...... 49 Water in Fuel ...... 50 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 25 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 a maximum of vehicle is moving. If you do, you Caution 40 seconds at extreme cold coolant could damage the transmission. and ambient 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 91. 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 20. heater is recommended. turn the ignition switch to This light may not come on if LOCK/OFF. Wait one minute If you experience longer cranking the engine is warm. for the cranking motor to cool, times, notice an unusual amount of 2. If the wait-to-start light is on, then try the 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 31. the steps in Running Out of Fuel The engine will continue to 0 0 53. See Fuel for Diesel Engines 45 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 53. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

26 Driving and Operating 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 45. 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 for pickup models soon as you can for a starting Do not use gasoline or starting or 1200 rpm for van models when system check. outside temperatures are below 0 °C aids, such as ether, in the air (32 °F), and the engine coolant If the light comes on and then goes intake. They could damage the temperature is below 65 °C (150 °F). off and you know the batteries are engine, which may not be charged, but the engine still will not This feature enhances heater covered by the vehicle warranty. start, the vehicle needs service. performance by raising the engine They could also cause a fire, coolant temperature faster. If the light does not come on when which could cause serious the engine is cold, the vehicle personal injury. To turn this feature on or off on needs service. pickup models, see Vehicle Personalization (Pickup Models) If the batteries do not have enough Engine Idle Variations 0 22 or Vehicle Personalization (Van charge to start the engine, see Models) 0 23. “Battery” in the owner manual. Under certain conditions the engine idle speed can vary or be elevated. On van models, this feature can be Check that the correct engine oil Change in idle speed is normal and turned on and off using the DIC has been used and changed at does not indicate a problem. Normal buttons. appropriate intervals. If the wrong oil conditions that can raise idle speed When the engine is started, it will is used, the engine may be harder are low voltage, DPF regeneration, slowly ramp up to the high idle to start. air conditioning compressor loads, speed after a delay of a few seconds up to approximately Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 27 two minutes. For this method to delay, if the conditions for engine . The cruise control Cancel switch work properly there must be no coolant temperature and air intake is pressed. throttle or brake pedal faults. temperature are still met. . The brake pedal is pressed. The engine idle speed will return to Fast Idle Control (Vans and . The transmission is shifted out normal once the following conditions 8-Cylinder Pickups Only) of P (Park) or N (Neutral). are met: The vehicle may have this system . The parking brake is released. . Engine coolant temperature which can be used to increase the . The vehicle speed is not reaches 65 °C (150 °F). engine idle speed. 0 km/h (0 mph). . Air intake temperature reaches Fast Idle control will be enabled On vans, when fast idle is active, a 0 °C (32 °F). when the following conditions FAST IDLE ON message will be are met: The high idle speed will be displayed in the DIC. temporarily interrupted and the . The parking brake is set. engine speed will return to normal if any of the following conditions . The transmission is in P (Park) Winter Cover occur: or N (Neutral). 4-Cylinder Pickups . The brake pedal is applied. . The vehicle speed is about Do not use a winter cover on 0 km/h (0 mph). . The accelerator pedal is 4-cylinder pickups. pressed. . The cruise control Set switch is pressed and released for Preset Vans and 8-Cylinder Pickups Only . The transmission is shifted out Fast Idle Speed (1200 rpm). If equipped, the winter cover can be of P (Park) or N (Neutral). Fast Idle control will be disabled used to enhance heater . Vehicle speed is detected. when one or more of the following performance in extremely cold conditions below −18 °C (0 °F). The Once these inputs are removed, the conditions occur: winter cover installs over the grille engine idle speed will slowly ramp . The cruise control Set switch is and restricts airflow to the engine back up to high idle after the normal pressed and released. See compartment. “Cruise Control” in the owner manual. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

28 Driving and Operating For vehicles that did not come with . Do not use the winter cover if a . Keep the underside of the winter a winter cover, a GM winter cover snow plow is mounted on the cover as clean as possible. can be purchased. See your dealer truck. Remove monthly or as for additional information. necessary and clean away dust When the winter cover is in use, the and debris. heater, ventilation, and air . Use only a mild soap to clean. conditioning AUTO mode may not Do not use harsh soap, strong function properly. Use the manual detergents, or vinyl protectant/ settings for comfort. sealant type products as they may damage the special finish. Usage Guidelines Allow the winter cover to dry The winter cover should only be completely before reinstalling. used while operating the vehicle in extremely cold temperatures or in Installation Instructions heavy snow for extended periods. In When first trying to fit the cover, it these temperatures, the vehicle may appear to be undersized but does not need a large amount of air . Do not cover the opening in the will stretch during installation to to properly cool the engine. When front bumper. ensure a tight fit. The initial more airflow is required to cool the installation of the cover is best . Do not modify the cover. The vehicle, the winter cover should not performed when the winter cover winter cover does not cover be used. The following usage is warm. some sections of the front of the guidelines will allow adequate vehicle to provide enough airflow for proper radiator and air airflow. cooler performance: . When the winter cover is used, . Do not use the winter cover if the outside air temperature towing a trailer. The vehicle may display may not function overheat if the radiator is properly. covered while towing. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 29 Installation (Chevrolet 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 Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

30 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 Installation (Van Models) fastening points as illustrated. 1. Open the hood and secure it 3. To remove, reverse the steps with the prop rod. listed previously. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 31 5. To remove the winter cover, reverse the steps listed previously. 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). The engine heater should be plugged in at least four hours before starting. To Use the Engine Heater 1. Turn off the engine. 2. Hook the five J-clips to the 4. Attach the metal hooks, one bottom edge of the grille. each at the top corners. 3. Hook the top center J-clip by the hood latch. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

32 Driving and Operating your dealer for a replacement. Inspect the cord for damage yearly. 4. Plug it into a normal, grounded 110-volt AC outlet.

{ Warning

Improper use of the heater cord or an extension cord can damage the cord and may result in overheating and fire. 8-Cylinder Pickups 4-Cylinder Vans . Plug the cord into a 2. Open the hood and unwrap the three-prong electrical utility electrical cord. For 8-cylinder receptacle that is protected pickups, the cord is in the by a ground fault detection engine compartment, on the function. An ungrounded driver side near the battery. For outlet could cause an 4-cylinder pickups, the cord is electric shock. in the engine compartment, on the driver side behind the . Use a weatherproof, battery, and on the passenger heavy-duty, 15 amp-rated side for 4-cylinder vans. extension cord if needed. Failure to use the 3. Clean and dry the heater cord recommended extension and connector ends. Check the cord in good operating 4-Cylinder Pickups heater cord for damage. If it is condition, or using a damaged, do not use it. See damaged heater or (Continued) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 33 5. Before starting the engine, be Fuel Operated Heater Warning (Continued) sure to unplug and store the cord as it was before to keep it (FOH) (Van Models Only) extension cord, could make away from moving engine parts it overheat and cause a fire, and prevent damage. property damage, electric shock, and injury. The length of time the heater should remain plugged in depends on the . Do not operate the vehicle outside temperature. You may wish with the heater cord to use the coolant heater to improve permanently attached to the ease of starting at temperatures vehicle. Possible heater between −18 °C (0 °F) and cord and thermostat −29 °C (−20 °F). Keep the coolant damage could occur. heater plugged in for a minimum of . While in use, do not let the four hours. At temperatures below heater cord touch vehicle −29 °C (−20 °F), the coolant heater parts or sharp edges. Never should remain plugged in for at least close the hood on the eight hours. Be sure to store the If equipped, the FOH will enhance heater cord. cord before starting the engine. See heater performance and will reduce Fuel for Diesel Engines 0 45 for the amount of time it takes to warm . Before starting the vehicle, the inside of the vehicle in cold unplug the cord, reattach information on what fuel to use in cold weather. conditions below or equal to 4 °C the cover to the plug, and (39 °F). securely fasten the cord. Keep the cord away from Caution The FOH is installed on the frame any moving parts. rail on the driver side of the vehicle Do not use the engine heater and uses diesel fuel to heat the continuously. This could damage engine coolant, which warms up the the engine heater and may cause passenger cabin air. a fire. Always unplug the engine heater after use. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

34 Driving and Operating The FOH will turn on if all of the Diesel Particulate following conditions exist: Caution Filter . Outside air temperature is below Permanent damage can occur to or equal to 4 °C (39 °F). The vehicle has a Diesel Particulate the DPF or related components if . Fuel level is greater or equal to Filter (DPF) as part of the exhaust the required Ultra Low Sulfur 12.5% of the total fuel tank system to reduce vehicle emissions. Diesel (15 ppm sulfur maximum) volume. The DPF requires a unique exhaust or low ash CJ-4 engine oil is not tailpipe with an exhaust cooler. The . The engine is running. used. This damage would not be exhaust cooler mixes air with the covered by the vehicle warranty. . Coolant temperature is less than exhaust to lower the temperature 70 °C (158 °F). before it leaves the tailpipe. Under certain driving conditions, The DPF, the tailpipe, or other such as stop-and-go traffic, the filter Parking over Things exhaust system components must cannot clean itself. A message not be altered. Inspect regularly and That Burn comes on when the DPF is dirty and clean any mud or dirt from the needs to perform a self cleaning. exhaust cooler, especially where the { Warning exhaust cooler connects to the For the filter to clean itself, the vehicle must be driven above Things that can burn could touch tailpipe and the openings where fresh air enters the cooler. 50 km/h (30 mph) until the message hot exhaust parts under the goes off. This will take about The DPF will clean itself as part of vehicle and ignite. Do not park 30 minutes. over papers, leaves, dry grass, normal operation. Several factors or other things that can burn. including fuel consumed, hours of engine operation, and miles driven { Warning are monitored by the Engine Control Module (ECM). The self-cleaning During DPF self cleaning or occurs approximately once per tank during extended idling in P (Park), of fuel. the exhaust system and exhaust (Continued) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 35 Extended idling in P (Park) can Warning (Continued) Caution (Continued) cause exhaust parts and gases to become very hot. Keep the exhaust gases are very hot. Things that action. Continued idling with the area clear of material that could burn could touch hot exhaust warning light/message on could ignite or burn. See Parking over parts under the vehicle and ignite. cause irreversible damage to the Things That Burn 0 34. You or others could be burned. DPF requiring repair and possible Do not park, or idle for an replacement that might not be If equipped with Power extended period of time, near or covered by the vehicle warranty. Take-Off (PTO), monitor the instrument cluster for lights related over papers, leaves, dry grass, to the DPF. or other things that can burn. You will also notice a change in the See Accessories and Modifications Keep the exhaust area clear of exhaust sound and engine idle 0 84 for important information if you material that could ignite or burn. speed. This is normal. See Parking over Things That are considering adding accessories Burn 0 34. If you continue to drive with the DPF or modifying the vehicle. warning message on and the exhaust filter is not cleaned as Manual Regeneration of Diesel required, the malfunction indicator Particulate Filter Caution lamp and the ENGINE POWER IS This feature is only available on REDUCED message will come on Fleet and Commercial vehicles. To Extended idle should be avoided and dealer service is necessary. verify that the vehicle has this because the DPF system is not See Malfunction Indicator Lamp feature, refer to the Vehicle Service 0 capable of self cleaning at idle. (Check Engine Light) 18. Parts Identification label (SPID) for During extended idle operation, Vehicles with the DPF have specific RPO code FPF or see monitor the instrument cluster fuel and engine oil requirements. www.gmupfitter.com to contact the telltale lights and Driver See What Fuel to Use in the U.S. GM Upfitter Integration Group for 0 0 Information Center for messages 46 and Engine Oil 91. assistance. and take appropriate indicated (Continued) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

36 Driving and Operating If equipped, this feature allows for If the vehicle cannot be stopped . The vehicle is parked outdoors, manual cleaning/regeneration of the when the DIC message first away from any walls or Diesel Particulate Filter (DPF) when indicates cleaning is available, buildings. it is unable to clean itself. It may be automatic self-cleaning may have . The vehicle is at least 3 m (10 ft) necessary to perform a manual begun. If conditions cannot be met from any obstructions or regeneration if driving conditions — for self-cleaning to complete, and materials that may combust such as extended slow speed, manual regeneration is selected, it or melt. stop-and-go traffic, extended idles, may take up to four minutes for the short drive cycles, or stationary PTO system to switch to manual . The shift lever is in P (Park). operation — prevent DPF regeneration. When the switch . The fuel tank is at least self-cleaning. occurs, a DIC message prompts to one-eighth full start the cleaning process. Manual regeneration can only be . All fluids are at the proper level. used when the DPF has become at Warning: The exhaust system and least 90% full. At 100% full, it will exhaust gases get very hot during a . No diagnostic trouble codes attempt to automatically self-clean if manual regeneration. Things that have been set, and the proper driving conditions are met. burn could touch hot exhaust parts malfunction indicator lamp is The DPF will clean itself if the under the vehicle and may catch not on. vehicle can be driven above fire. You or others could be burned. . The engine coolant temperature 50 km/h (30 mph) for about Do not leave the vehicle unattended is above 71 °C (160 °F). 30 minutes. during a manual regeneration. After making sure all of the safety A Driver Information Center (DIC) Before starting the manual conditions have been met, press the message displays when manual regeneration, make sure all of the trip odometer reset stem or < regeneration is possible. following safety conditions are met: symbol for the check button> on the Scroll through the DIC pages to find . The vehicle is parked on level steering wheel control for at least the Exhaust Cleaning menu. ground, away from any one second to select Start on the Depending on whether the vehicle flammable materials. infotainment display. has a base or uplevel cluster, it may be under the Settings menu. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 37 Follow the instructions in the DIC When manual regeneration begins, Diesel Exhaust Fluid messages. Touch ACCEPT to the engine speed increases, the acknowledge that all of these safety engine cooling fan sound increases, conditions have been met and to and a DIC message indicates that { Warning activate regeneration. cleaning is in progress. Diesel Exhaust Fluid (DEF) is If the infotainment display returns to A DIC message will display when corrosive. Do not allow it to come the previous screen, then one or cleaning has completed. The in contact with your skin, eyes, more of the necessary operating message will remain as long as or the finished surfaces of the conditions has not been met. If you cleaning is not necessary. Cleaning vehicle. If exposed, it may cause cannot determine which condition could take up to 30 minutes. Upon skin and eye irritation. Wear skin has not been met, see completion, the engine will return to and eye protection when www.gmupfitter.com to contact the normal idle, but exhaust handling. Inhalation may cause GM Upfitter Integration Group for components will remain hot for assistance. several minutes. Do not move the irritation to the upper respiratory tract. For more safety and storage Continue to follow the instructions in vehicle until the exhaust has had time to cool. Manual regeneration information, see the label of the the DIC messages. Hold the Diesel Exhaust Fluid container. Exhaust Brake switch on the can be canceled at any time by instrument panel below the climate pressing the brake pedal or turning controls for more than the engine off. Unusual noises may Diesel Exhaust Fluid (DEF) is used three seconds, and then release it, be heard if regeneration is with diesel engines to reduce the to begin the regeneration process. interrupted. amount of regulated emissions produced. The fluid level in the DEF If the EXHAUST BRAKE ON tank must be maintained for the message displays, then the switch vehicle to run properly. DEF is not a was released too soon. Press it fuel additive. DEF should not be again to turn off the exhaust brake, mixed with or added to diesel fuel. then try again when the DIC DEF freezes when exposed to message prompts. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

38 Driving and Operating temperatures below −11 °C Filling the DEF Tank (12 ° F).For DEF tank capacity see Capacities and Specifications 0 131. Caution Locating Diesel Exhaust Fluid Use only DEF that is GM DEF can be purchased at a approved, or fluid containing the Chevrolet or GMC dealer. It can API certified or ISO 22241 label. also be purchased at authorized The use of other fluids could vehicle and truck dealerships. damage the system, requiring Additionally, some diesel truck costly repairs that will not be fueling stations or retailers may covered by the vehicle warranty. have DEF for purchase. For vehicles with an active OnStar DEF Fill–Van Model Shown, subscription, OnStar can help to When adding fluid, it is 4-Cylinder Pickups Similar locate a DEF retailer. See recommended to fill the DEF tank. “Customer Assistance Offices” in For DEF tank capacity see For vans and 4-cylinder pickups, the the owner manual for phone Capacities and Specifications 0 131. DEF fill is behind the fuel fill door. numbers to assist in contacting a Do not overfill the DEF tank. When The DEF cap is blue, and the diesel GM dealer. See Recommended fluid reaches the top of the fill pipe, cap is green. 0 Fluids and Lubricants 126. stop filling. The fill tube location for chassis cab If you spill DEF on the vehicle while and cutaway vans finished by an filling the tank, rinse the area with upfitter will vary. Check the upfitter water and wipe the surface with a manual. damp cloth. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 39 As the DEF level drops, warnings If DEF is added under freezing will automatically be displayed in the conditions, additional time may be DIC. DEF level status is available required to remove speed limitations on the DIC under the vehicle and may require less fluid to fill the Information button. See “Exhaust DEF tank. Fluid Level” in Driver Information 0 The following actions describe Center (DIC) 21. strategies required by the U.S. To avoid vehicle speed limitations, Environmental Protection Agency the DEF tank should be refilled at (EPA) and the California Air the first opportunity after a low Resource Board (CARB). The DEF warning indication. If DEF is added messages relate to these strategies. before the EXHAUST FLUID The EXHAUST FLUID RANGE DEF Fill 8-Cylinder Pickups – EMPTY REFILL NOW message message first displays at For 8-cylinder pickups, the DEF fill appears, it may take several km/mi approximately 1 600 km (1,000 mi). is under the hood, on the passenger for the DIC message to update. This message appears again at side, at the back of the engine If the vehicle speed has been approximately 500 km (300 mi) of compartment. The DEF cap is blue. limited and DEF has been added, it remaining range before the exhaust In certain cold conditions, it is may take up to 30 seconds after fluid tank becomes empty. possible to find some frozen DEF in engine start with the vehicle Based on driving conditions the the DEF fill pipe opening. If this stopped for the EXHAUST FLUID amount needed to fill the tank condition prevents the filling of a EMPTY REFILL NOW message to will vary. DEF tank, place the vehicle in a clear. If the vehicle is driven prior to See the following list for warm garage overnight. the DIC message clearing, the vehicle speed will still be limited. approximate volume required to fill Exhaust Fluid Low If the DIC message clears while the DEF tank when 1 600 km (1,000 mi) warning appears: A full DEF tank will last for several driving, the speed limitation will be thousand kilometers (miles), removed gradually. . Colorado/Canyon - 4-cylinder - depending on vehicle usage. 16.5 L (4.5 gal) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

40 Driving and Operating . Silverado/Sierra/Sierra Denali - The displayed mileage will decrease When the mileage countdown is 8-cylinder - 14.5 L (3.8 gal) as driving continues. A warning light zero, the DIC message EXHAUST . Express/Savana - 4-cylinder - also comes on. FLUID EMPTY REFILL NOW - 14.5 L (3.8 gal) When the mileage countdown is TRANSITIONING TO 89 KM/H zero, the DIC message EXHAUST (55 MPH) MAX SPEED displays. Below 500 km (300 mi) of range A flashing warning light and a chime remaining, these messages will FLUID EMPTY REFILL NOW - TRANSITIONING TO 105 KM/H also come on. Vehicle speed will be appear every time the vehicle is reduced to a maximum speed limit started. (65 MPH) MAX SPEED displays. A warning light and a chime also of 89 km/h (55 mph). If these warnings are ignored and come on. Vehicle speed will be After the transition to 89 km/h the DEF tank becomes empty, the reduced to a maximum speed limit (55 mph) is complete, the DIC DIC message displays: of 105 km/h (65 mph). message EXHAUST FLUID EMPTY . For vans and 4-cylinder pickups, After the transition to 105 km/h REFILL NOW - SPEED LIMITED EXHAUST FLUID EMPTY (65 mph) is complete, the DIC TO 89 KM/H (55 MPH) – 120 KM REFILL NOW - 644 KM (400 MI) message displays: (75 MI) UNTIL 8 KM/H (5 MPH) MAX UNTIL 105 KM/H (65 MPH) MAX SPEED displays. The displayed SPEED. . EXHAUST FLUID EMPTY mileage will decrease as driving REFILL NOW - SPEED LIMITED continues. A flashing warning light . For 8-cylinder pickups, TO 105 KM/H (65 MPH) – and a chime also come on. EXHAUST FLUID EMPTY 120 KM (75 MI) UNTIL 89 KM/H REFILL NOW - 805 KM (500 MI) (55 MPH) MAX SPEED. When the mileage countdown is UNTIL 105 KM/H (65 MPH) MAX zero, the DIC message EXHAUST SPEED. . For emergency pickups with FLUID EMPTY REFILL NOW - RPO ANM, EXHAUST FLUID TRANSITIONING TO 8 KM/H . For emergency pickups with EMPTY REFILL NOW - SPEED (5 MPH) MAX SPEED displays. RPO ANM, EXHAUST FLUID LIMITED TO 158 KM/H A flashing warning light and a chime EMPTY REFILL NOW - (98 MPH) MAX SPEED. also come on. Vehicle speed will be 65 534 KM (40,721 MI) UNTIL The displayed mileage will decrease reduced to a maximum speed limit 158 KM/H (98 MPH) MAX of 8 km/h (5 mph). SPEED. as driving continues. A warning light and a chime also come on. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 41 After the transition to 8 km/h (5 mph) . EXHAUST FLUID QUALITY come on. Vehicle speed will be is complete, the DIC message POOR - SEE OWNERS reduced to a maximum speed limit EXHAUST FLUID EMPTY REFILL MANUAL NOW – 160 KM of 105 km/h (65 mph). NOW - SPEED LIMITED TO 8 KM/H (99 MI) UNTIL 105 KM/H After the transition to 105 km/h (5 MPH) displays. A flashing (65 MPH) MAX SPEED. (65 mph) is complete, the DIC warning light and a chime also . For emergency pickups with message displays: come on. RPO ANM, EXHAUST FLUID . EXHAUST FLUID QUALITY It is recommended to fill the DEF QUALITY POOR - SEE POOR - SEE OWNERS tank. At least 7.6 L (2 gal) of DEF OWNERS MANUAL NOW – MANUAL NOW - SPEED need to be added to release the 65 534 KM (40,721 MI) UNTIL LIMITED TO 105 KM/H vehicle from the speed limitation. 158 KM/H (98 MPH) MAX (65 MPH) – 120 KM (75 MI) See Capacities and Specifications SPEED. 0 UNTIL 89 KM/H (55 MPH) MAX 131, Diesel Exhaust Fluid (DEF) The displayed mileage will decrease SPEED. Warning Light 0 20, and as driving continues. A warning light . For emergency pickups with Recommended Fluids and also comes on. Adding fresh DEF to Lubricants 0 126. RPO ANM, EXHAUST FLUID the system may resolve the QUALITY POOR - SEE Exhaust Fluid Quality Poor problem, depending on several OWNERS MANUAL NOW - factors. If the DIC message persists, Use only DEF that is GM approved, SPEED LIMITED TO 158 KM/H see your dealer or additional DIC (98 MPH) MAX SPEED. or fluid containing the API certified messages may display. or ISO 22241 label. The displayed mileage will decrease When the mileage countdown is DEF has an expiration date. If the as driving continues. A warning light zero, a DIC message EXHAUST and a chime also come on. system detects poor quality, FLUID QUALITY POOR - SEE or contaminated or diluted DEF, the OWNERS MANUAL NOW - When the mileage countdown is DIC message displays: TRANSITIONING TO 105 KM/H zero, the DIC message EXHAUST (65 MPH) MAX SPEED displays. FLUID QUALITY POOR - SEE A warning light and a chime also OWNERS MANUAL NOW - TRANSITIONING TO 89 KM/H (55 MPH) MAX SPEED displays. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

42 Driving and Operating A flashing warning light and a chime SPEED LIMITED TO 8 KM/H When the mileage countdown is also come on. Vehicle speed will be (5 MPH) displays. A flashing zero, the DIC message SERVICE reduced to a maximum speed limit warning light and a chime also EXHAUST FLUID SYSTEM - SEE of 89 km/h (55 mph). come on. OWNERS MANUAL NOW - TRANSITIONING TO 105 KM/H After the transition to 89 km/h Service Exhaust Fluid System (55 mph) is complete, a DIC (65 MPH) MAX SPEED displays. message EXHAUST FLUID If a problem occurs with the DEF A warning light and a chime also QUALITY POOR - SEE OWNERS system, the DIC message displays: come on. Vehicle speed will be MANUAL NOW - SPEED LIMITED . SERVICE EXHAUST FLUID reduced to a maximum speed limit of 105 km/h (65 mph). TO 89 KM/H (55 MPH) – 120 KM SYSTEM - SEE OWNERS (75 MI) UNTIL 8 KM/H (5 MPH) MAX MANUAL NOW – 160 KM After the transition to 105 km/h SPEED displays. The displayed (99 MI) UNTIL 105 KM/H (65 mph) is complete, a DIC mileage will decrease as driving (65 MPH) MAX SPEED. message displays: continues. A flashing warning light . For emergency pickups with . SERVICE EXHAUST FLUID and a chime also come on. RPO ANM, SERVICE EXHAUST SYSTEM - SEE OWNERS When the mileage countdown is FLUID SYSTEM - SEE MANUAL NOW - SPEED zero, a DIC message EXHAUST OWNERS MANUAL NOW – LIMITED TO 105 KM/H FLUID QUALITY POOR - SEE 65 534 KM (40,721 MI) UNTIL (65 MPH) – 120 KM (75 MI) OWNERS MANUAL NOW - 158 KM/H (98 MPH) MAX UNTIL 89 KM/H (55 MPH) MAX TRANSITIONING TO 8 KM/H SPEED. SPEED. (5 MPH) MAX SPEED displays. The displayed mileage will decrease . For emergency pickups with A flashing warning light and a chime as driving continues. A warning light RPO ANM, SERVICE EXHAUST also come on. Vehicle speed will be also comes on. In some cases this FLUID SYSTEM - SEE reduced to a maximum speed limit message will clear itself, indicating OWNERS MANUAL NOW - of 8 km/h (5 mph). that the DEF system was able to SPEED LIMITED TO 65 534 KM After the transition to 8 km/h (5 mph) correct the condition. If the DIC (40,721 MI) UNTIL 158 KM/H is complete, a DIC message message persists, see your dealer (98 MPH) MAX SPEED. EXHAUST FLUID QUALITY POOR or additional DIC messages may - SEE OWNERS MANUAL NOW - display. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 43 The displayed mileage will decrease (5 MPH) MAX SPEED displays. If the DIC message persists, see as driving continues. A warning light A flashing warning light and a chime your dealer or additional DIC and a chime also come on. also come on. Vehicle speed will be messages may display. When the mileage countdown is reduced to a maximum speed limit When the mileage countdown is zero, the DIC message SERVICE of 8 km/h (5 mph). zero, the DIC message SERVICE EXHAUST FLUID SYSTEM - SEE After the transition to 8 km/h (5 mph) EMISSION SYSTEM - SEE OWNERS MANUAL NOW - is complete, the DIC message OWNERS MANUAL NOW - TRANSITIONING TO 89 KM/H SERVICE EXHAUST FLUID TRANSITIONING TO 105 KM/H (55 MPH) MAX SPEED displays. SYSTEM - SEE OWNERS (65 MPH) MAX SPEED displays. A flashing warning light and a chime MANUAL NOW - SPEED LIMITED A chime also comes on. Vehicle also come on. Vehicle speed will be TO 8 KM/H (5 MPH) displays. speed will be reduced to a reduced down to a maximum speed A flashing warning light and a chime maximum speed limit of 105 km/h limit of 89 km/h (55 mph). also come on. (65 mph). After the transition to 89 km/h Service Emission System After the transition to 105 km/h (55 mph) is complete, the DIC (65 mph) is complete, the DIC message SERVICE EXHAUST These restrictions are not applicable message SERVICE EMISSION FLUID SYSTEM - SEE OWNERS to emergency pickups with SYSTEM - SEE OWNERS MANUAL NOW - SPEED LIMITED RPO ANM. MANUAL NOW - SPEED LIMITED TO 89 KM/H (55 MPH) – 120 KM If a problem occurs with the vehicle TO 105 KM/H (65 MPH) – 120 KM (75 MI) UNTIL 8 KM/H (5 MPH) MAX emission system, the DIC message (75 MI) UNTIL 89 KM/H (55 MPH) SPEED displays. The displayed SERVICE EMISSION SYSTEM - MAX SPEED displays. The mileage will decrease as driving SEE OWNERS MANUAL NOW – displayed mileage will decrease as continues. A flashing warning light 282 KM (175 MI) UNTIL 105 KM/H driving continues. A chime also and a chime also come on. (65 MPH) MAX SPEED displays. comes on. When the mileage countdown is The displayed mileage will decrease When the mileage countdown is zero, the DIC message SERVICE as driving continues. In some cases zero, the DIC message SERVICE EXHAUST FLUID SYSTEM - SEE this message will clear itself, EMISSION SYSTEM - SEE OWNERS MANUAL NOW - indicating that the emission system OWNERS MANUAL NOW - TRANSITIONING TO 8 KM/H was able to correct the condition. TRANSITIONING TO 89 KM/H Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

44 Driving and Operating (55 MPH) MAX SPEED displays. Brakes The exhaust brake only activates A chime also comes on. Vehicle when the transmission torque speed will be reduced to a converter is locked. This can vary maximum speed limit of 89 km/h Exhaust Brake based on vehicle speed, gear, (55 mph). The exhaust brake can be used to and load. After the transition to 89 km/h enhance the vehicle brake system To activate the system, press the (55 mph) is complete, the DIC and reduce brake lining wear. switch on the center stack. message SERVICE EMISSION Downshifts may be automatically SYSTEM - SEE OWNERS selected to increase engine speed, MANUAL NOW - SPEED LIMITED which increases the effectiveness of TO 89 KM/H (55 MPH) displays. the exhaust brake. The number of A chime also comes on. downshifts selected is determined by the length of time the brakes are applied and the rate the vehicle is slowing. The system delivers the correct amount of braking to assist in vehicle control. The heavier the vehicle load, the more active the engine exhaust brake will be. Use of the exhaust brake will help maintain vehicle speed when used with 8-Cylinder Pickups cruise control. See “Cruise Control” For 8-cylinder pickups, use the in the owner manual. exhaust brake switch. A light in the Automatic downshifts will not occur switch will come on when the if the vehicle is in Range Selection exhaust brake is activated. The switch must be pressed at each Mode. See “Manual Mode” in the owner manual. vehicle start for the system to be active. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 45 The Driver Information Center (DIC) Fuel displays the message EXHAUST BRAKE ON for approximately three seconds, then clears. Fuel for Diesel Engines To turn the brake off, press the The selection of a high quality fuel exhaust brake switch a second time. is important for maintaining optimum The DIC displays the message performance. Do not use diesel fuel EXHAUST BRAKE OFF for with more than 15 ppm sulfur approximately three seconds, then content. Do not use a diesel blend clears. containing more than 20% biodiesel by volume. Both diesel and The exhaust brake will be more biodiesel blends must meet all the active when in Tow/Haul Mode. 4-Cylinder Vans requirements as defined in the most current versions of the local fuel For 4-cylinder pickups and vans, the standards. See the recommended exhaust brake is activated when fuels under What Fuel to Use in the Tow/Haul Mode is activated. See U.S. 0 46 and What Fuel to Use in “Tow/Haul Mode” in the owner Canada 0 47. manual. A light comes on in the instrument Caution cluster when the exhaust brake and Tow/Haul are activated. The switch Engine damage may occur if 4-Cylinder Pickups must be pressed at each vehicle recommended fuels are not used, start for the system to be active. which may void the vehicle warranty. Some improper fuels are: (Continued) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

46 Driving and Operating Some conditions, such as dirty fuel, Use diesel fuel that meets ASTM Caution (Continued) may decrease fuel filter life and a specification D975, Grades No. 2-D CHANGE FUEL FILTER message or No. 1-D S15, also known as Ultra . Diesel fuel with the addition may come on in the Driver Low Sulfur Diesel. Contact a fuel of gasoline. Information Center (DIC). suppler for any questions. . Diesel fuel mixed with engine oil or automatic What Fuel to Use in Caution transmission fluid. the U.S. . Triglyceride fuels, such as Use of diesel fuel other than Ultra Use of diesel fuel with ultra low raw vegetable oil or animal Low Sulfur Diesel (15 ppm sulfur sulfur content (15 ppm, maximum) is fat, in any form, including maximum) will cause damage to required. Look for service station with blends of diesel or the exhaust after-treatment fuel dispensers with this label in biodiesel. system. This damage would not green: be covered by the vehicle . Marine diesel fuel and fuel oils. warranty. Do not use marine, locomotive, or boiler distillate fuel . Diesel-water emulsions, since it may contain higher sulfur such as Aquazole. levels. . Aftermarket diesel fuel additives, which contain Diesel Fuel Grades alcohols, organo-metallic additives, or water For best results use No. 2-D diesel emulsifiers. fuel year-round because it is blended for seasonal temperature . Diesel fuel with sulfur differences, both above and below greater than 15 ppm. freezing conditions. No. 1-D diesel . Diesel-biodiesel blends not also meeting ASTM International within the required D975 fuel can be used in very cold specification. temperatures (below −18 °C or 0 °F); however, it will reduce power Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 47 and fuel economy. Avoid using No. Premium Diesel Fuel Caution 1-D diesel fuel in warm or hot If available, premium diesel fuel climates. It can result in stalling, (FQP-1A) corresponding to the poor starting when the engine is hot, Use of diesel fuel other than Ultra Low Sulfur Diesel (15 ppm sulfur Engine Manufacturers Association and damage to the fuel injection (EMA) Recommended Guideline system. maximum) will cause damage to the exhaust after-treatment could provide better starting and Premium Diesel Fuel system. This damage would not vehicle performance with less noise. Premium Diesel Fuel (FQP-1A) be covered by the vehicle corresponding to the Engine warranty. Do not use marine, Biodiesel Manufacturers Association (EMA) locomotive, or boiler distillate fuel Biodiesel is a renewable fuel Recommended Guideline may since it may contain higher sulfur produced from vegetable oils or provide less noise, better starting, levels. animal fats that have been and better vehicle performance, but chemically modified to make it is not required. compatible with diesel fuel. Diesel Fuel Types What Fuel to Use in Fuels are blended for seasonal Caution Canada changes. Diesel Type A fuel is blended to ensure vehicles operate Do not use home-made biodiesel Use of diesel fuel with ultra low in extreme cold temperatures. This or home test kits because the sulfur content (15 ppm maximum) is fuel, however, may cause some quality cannot be verified by required. Use diesel fuel that meets power and fuel economy losses. approved scientific methods. Do CAN/CGSB-3.517 specification in Diesel Type B fuel is blended for not use raw vegetable oil or other Canada. Contact a fuel supplier for higher temperatures experienced unmodified bio-oils, fats, questions about fuel. during most of the year. Avoid using or blends of vegetable oil with Diesel Type A fuel in warm or hot diesel. They could damage the climates. Doing so can result in stalling, poor starting when the fuel system and engine, and engine is hot, and damage to the damages would not be covered fuel injection system. by the vehicle warranty. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

48 Driving and Operating fuel. Storage at hot ambient Fuels improperly blended for cold Caution temperatures will accelerate temperature operation may result in biodiesel degradation. restricted fuel filters and degraded Do not use blends containing vehicle performance. The vehicle is more than 20% biodiesel. Any Owners who use very little fuel, or who have vehicles stored for equipped with a fuel heating system engine, fuel system, or exhaust to provide a level of protection after-treatment system damage extended periods of time, should avoid the use of biodiesel blended against filter plugging from gelling or would not be covered by the waxing of conventional diesel fuel vehicle warranty. fuels above 5% by volume. When vehicles are stored for longer than and biodiesel blends. If the one month, they should be run out operating temperature is far below As a renewable fuel, biodiesel of biodiesel to below one-quarter the temperature at which gelling or provides some environmental tank, refueled with Ultra Low Sulfur waxing of the fuel occurs, the benefits. However, biodiesel has Diesel fuel, and driven several miles system will not prevent all cases of unique properties and needs to be before storage. filter plugging. handled differently than diesel fuel. At temperatures below 32 °F (0 °C), If the vehicle experiences a fuel Its use presents additional risks and it is recommended to switch to Ultra filter restriction, the on-board may not be appropriate in all Low Sulfur Diesel fuel with no monitoring system will alert the situations. Certain vehicle operating biodiesel content, or to blends with driver that the fuel filter requires modes increase these risks and biodiesel containing less than 5% by service. The fuel filter, however, will should be avoided. Read further to volume. At these extreme cold not prevent all damage caused by determine if your driving habits are temperatures, biodiesel blends poor quality biodiesel. compatible with the use of biodiesel. higher than 5% by volume may Biodiesel fuel quality degrades with cause fuel filter plugging and time and exposure to high system gelling, which can lead to temperature quicker than Ultra Low vehicle operability problems. Sulfur Diesel fuel. More frequent refueling provides the best opportunity to have a supply of fresh Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 49 Biodiesel Blends in the U.S. To reduce the risk of poor quality fuel, purchase biodiesel blends from Use biodiesel blends that meet the a fuel supplier or fueling station ASTM specification D6751. which sells BQ-9000 certified Retail pumps dispensing blends biodiesel. See www.bq-9000.org for containing up to 5% biodiesel (B5) a list of certified marketers. are not required to be labeled with the concentration of biodiesel. Biodiesel Blends in Canada Blends up to B5 must meet ASTM Biodiesel blends that meet the D975 (Grades No. 2-D or No. 1-D CAN/CGSB-3.522 specifications up S15 Ultra Low Sulfur Diesel). When to 20% (B20) can be used. Do not refueling with a biodiesel blend use biodiesel blends above 20%, as above B5, one of the following they may damage the engine and labels should appear on the fuel system. dispenser: Cold Weather Operation Caution In cold weather, the fuel filter may Do not use blends containing become clogged by wax naturally more than 20% biodiesel. Any present in the fuel. To unclog it, engine, fuel system, or exhaust move the vehicle to a warm garage area and allow the filter to warm up. after-treatment system damage The fuel filter may need to be would not be covered by the replaced. See Fuel Filter vehicle warranty. Replacement 0 54. Blends containing more than 5% At temperatures below 0 °C (32 °F), and up to 20% biodiesel must meet it is recommended to avoid using ASTM specification D7467 biodiesel blends above 5% blend. (Biodiesel blend, B6 - B20) and are This blend may cause fuel filter labeled with an orange or blue label. plugging, system gelling, and Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

50 Driving and Operating freezing that may affect vehicle starting. You may need to turn the { Warning Caution (Continued) ignition on and off a few times before the vehicle will start. Also, Diesel fuel containing water is still If the fuel tank needs to be idle the vehicle for a couple of combustible. You or others could purged to remove water, see your minutes before accelerating. be burned. If the fuel needs to be dealer or a qualified technician. drained, keep sparks, flames, and Improper purging can damage the It is recommended to use Ultra Low smoking materials away from the fuel system and block the FOH. Sulfur No. 1-D diesel fuel or a blend mixture. of No. 1-D and No. 2-D diesel fuel to enhance vehicle operation in cold Water in Fuel Troubleshooting weather at temperatures below 0 °C If the WATER IN FUEL SERVICE (32 °F). Use of No. 1-D diesel fuel Caution REQUIRED message comes on: may lower the fuel economy. For additional information for better cold Water in the diesel fuel can Recommended weather operation, see Engine corrode internal components of Problem Action Heater 0 31. the fuel system and lead to Message The fuel filter is severe damage. It can also displays but partially filled Water in Fuel support fungus or bacteria goes off during with water. Drain Improper fuel tank inspection or growth, which can damage the the ignition the water as cleaning, or contaminated fuel from fuel system and fuel operated cycle. soon as suppliers, can cause water to be heater (FOH) (if equipped). Even possible. See pumped into the fuel tank along with with a diesel fuel biocide, the fuel "Removing the diesel fuel. If a WATER IN FUEL system may still need to be Water from the SERVICE REQUIRED message cleaned. Your dealer can advise Fuel Filter" displays, the water must be drained of the appropriate solution. following. immediately. (Continued) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 51

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 Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

52 Driving and Operating 2. Place a container under the engine stalls, the fuel system filter drain valve. The filter drain may need to be primed. See valve is on the bottom of the “Fuel Priming” following. fuel filter. The filter drain valve is under the vehicle on the Fuel Priming driver side, inside the For the fuel system to work properly, frame rail. the fuel lines must be full of fuel. 3. For 8-cylinder pickup and If air gets in, the fuel lines need to 4-cylinder van models, open be primed before operating the the drain valve by turning it vehicle and the fuel operated counterclockwise. Allow the heater (FOH). filter to drain until all of the If air is present, the following may 8-Cylinder Pickup Shown, Van water has been removed. have happened: Similar Close the valve. . The vehicle ran out of fuel. For 4-cylinder pickups, open . The fuel filter was removed. the fuel filter drain valve by turning it two to three turns. . The fuel lines were removed or Allow the filter to drain until all disconnected. of the water has been . The fuel filter water drain valve removed. Close the valve hand was opened while the engine tight. was running. 4. Properly dispose of the water . The FOH pump and FOH fuel contaminated fuel. lines were removed or 5. Start the engine and let it run disconnected. for a few minutes. During the draining process, air may have 4-Cylinder Pickup entered the fuel system. If the Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 53 The system is not harmed by air in 5. Repeat the above steps until the fuel lines; however, the engine the engine starts. Warning (Continued) and/or the FOH may not start until 6. If the engine starts, but does any fuel from the air bleed valve, the fuel system is primed and the air not run smoothly, increase the is removed. and wipe up any spilled fuel with engine speed slightly. a cloth. Priming the Fuel System 7. If the engine starts and runs There is an electric priming pump but stalls again, turn the If the engine has stalled due to that will bring fuel to the engine and ignition off for 60 seconds. running out of fuel, try the following eliminate air in the fuel lines. To 8. When the engine starts, let it steps to restart it: prime the engine: idle for a few minutes and 1. If parked on a level surface, 1. Correct any condition that check the filter for any leaks. add at least 7.6 L (2 gal) of caused the loss of prime. To Prime the Fuel Operated Heater fuel. Up to 18.9 L (5 gal) may 2. Turn the ignition on for (FOH) Fuel Lines (Van Models) be needed if parked on a slope. 30 seconds. Do not start the See your dealer or qualified engine. The fuel pump will start technician if the FOH fuel lines need 2. Follow the fuel priming priming. to be primed. procedure earlier in this section 3. Turn the ignition off, then back to prime the fuel filter. to start, and crank the engine Running Out of Fuel 3. Turn the ignition key to START for 15 seconds. for 10 to 15 seconds at a time 8-Cylinder Pickup Models 4. If the engine does not start, until the engine starts. If the repeat Steps 2 and 3 until the engine tries to run, but does engine starts. { Warning not run smoothly, increase the rpm slightly by using the If the engine does not start Diesel fuel is combustible. It could accelerator pedal. This will help after repeating Steps 2 and 3 start a fire if it gets on hot engine force air through the system. three times, turn the ignition off parts. You could be burned. Catch for 60 seconds. 4. Return to Step 2 if the engine (Continued) stalls and will not restart. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

54 Driving and Operating 5. After a few attempts, if the Fuel Filter Replacement engine still does not start, see your dealer. 8-Cylinder Pickup and 4-Cylinder Van Models 4-Cylinder Pickup and Van Models { Warning If the engine has stalled due to running out of fuel, try to restart it: Diesel fuel is flammable. It could start a fire if something ignites it, 1. If parked on a level surface, and people could be burned. Do add at least 3.8 L (1 gal) of fuel. not let it get on hot engine parts, Up to 18.9 L (5 gal) may be and keep matches or other needed if parked on a slope. ignition sources away. Van Shown, Pickup Similar 2. Follow the vehicle fuel system priming procedure earlier in 3. Remove the filter element cap this section to re-prime the The fuel filter is on the driver side, by turning it counterclockwise. inside the frame rail. system and restart the engine. 4. Remove the filter element. If the check engine light comes on To replace the fuel filter: If there is any dirt on the filter due to running out of fuel, it may 1. Drain any water from the filter. sealing surface, clean it off. take a few drive cycles to clear. See “Removing Water from the 5. Install the new filter element On van models only, the fuel Fuel Filter” in Water in Fuel and o-ring. 0 50. operated heater (FOH) stops 6. Reinstall and tighten the filter automatically when the fuel tank Keep the engine off until the cap to the housing. volume is less than or equal to 10% procedure is completed. of the total tank. The FOH fuel lines 7. Use the fuel filter priming 2. Apply the parking brake. will not need to be primed if the procedure to prime the fuel vehicle runs out of fuel. filter. See “Fuel Priming” in Water in Fuel 0 50. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 55 8. Start the engine and let it idle for five minutes. Check the fuel Caution filter and air bleed valve for leaks. Failure to cover the fuel filter with a clean cloth to keep out debris 9. Reset the fuel filter monitor. when replacing may cause dirt to See Driver Information Center get into the engine. This could 0 (DIC) 21. cause engine damage. Keep the If the van Fuel Operated Heater fuel filter covered with a clean (FOH) (if equipped) is not working, cloth when replacing. the FOH line requires priming. See your dealer for service. See Fuel Operated Heater (FOH) (Van Models Only) 0 33. The fuel filter is on the driver side, inside the frame rail in front of the 4-Cylinder Pickup Models fuel tank. 1. Drain any water from the filter. { Warning See “Removing Water from the Fuel Filter in Water in Fuel Diesel fuel is flammable. It could ” 0 50. start a fire if something ignites it, and people could be burned. Do Keep the engine off until the not let it get on hot engine parts, procedure is completed. and keep matches or other 2. Apply the parking brake. ignition sources away. 3. There are two caps under the 4. Remove both filter elements. filter. Clean the fuel filter area If there is any dirt on the filter before removing these two sealing surface, clean it off. filter caps. 5. Install the new filter elements and tighten both caps. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

56 Driving and Operating 6. Use the fuel filter priming procedure earlier in this section Warning (Continued) to prime the fuel filter. . Do not leave the fuel pump 7. Start the engine and let it idle unattended. for five minutes. Check the fuel filter for leaks. . Do not re-enter the vehicle while pumping fuel. 8. Reset the fuel filter monitor. See Driver Information Center . Keep children away from (DIC) 0 21. the fuel pump and never let children pump fuel. Filling the Tank . Fuel can spray out if the fuel cap is opened too quickly. Van Shown, Pickup Similar { Warning This spray can happen if the tank is nearly full, and is The green fuel cap is behind a Fuel vapors and fuel fires burn more likely in hot weather. hinged door on the driver side of the violently and can cause injury or Open the fuel cap slowly vehicle. On van and 4-cylinder pickup models, the blue Diesel death. and wait for any hiss noise to stop, then unscrew the Exhaust Fluid cap is also behind the . To help avoid injuries to you cap all the way. fuel door. Do not remove both caps and others, read and follow at the same time. all the instructions on the For models with dual fuel tanks, the fuel pump island. fuel gauge shows an average of . Turn off the engine when both tanks. The rear tank is emptied refueling. first. When refueling, refuel the front . Keep sparks, flames, and tank first, then add fuel to the smoking materials away rear tank. from fuel. To remove the fuel cap, turn it (Continued) slowly counterclockwise. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 57

{ Warning { Warning Caution

Overfilling the fuel tank by more Heat coming from the engine can If a new fuel cap is needed, be than three clicks of a standard fill cause the fuel to expand and sure to get the right type of cap nozzle may cause: force the fuel out of the tank. from your dealer. The wrong type . Vehicle performance issues, If something ignites the fuel, a fire of fuel cap might not fit properly including engine stalling and could start. To help avoid this, fill and could damage the fuel tank damage to the fuel system. the tank slowly and only until the and emissions system. nozzle shuts off. Do not top it off. . Fuel spills. Clean up any spilled fuel. Accidental Refueling with . Potential fuel fires. Gasoline When replacing the fuel cap, turn it Be careful not to spill fuel. Wait a clockwise until it clicks. Make sure Caution few seconds after you have finished the cap is fully installed. pumping before removing the If the vehicle is accidentally nozzle. Clean fuel from painted { Warning refueled with gasoline, do not surfaces as soon as possible. See continue driving the vehicle “Exterior Care” in the owner’s If a fire starts while you are except to get to a location where manual. refueling, do not remove the it can be stopped safely. Driving Diesel fuel can foam when filling the nozzle. Shut off the flow of fuel by the vehicle will damage the fuel tank. This can cause the automatic shutting off the pump or by system. Have the vehicle towed pump nozzle to shut off, even if the notifying the station attendant. to a qualified technician to have tank is not full. If this happens, wait Leave the area immediately. the gasoline removed from the for the foaming to stop, and then fill tank and fuel system. Flush the the tank more slowly. fuel system with Ultra Low Sulfur Diesel fuel to ensure all gasoline is removed. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

58 Driving and Operating Filling a Portable Fuel Warning (Continued) Trailer Towing Container When towing at high elevation on . Place the nozzle inside the steep uphill grades, consider the { Warning fill opening of the container following: before dispensing fuel, and Engine coolant at higher elevation Filling a portable fuel container keep it in contact with the fill while it is in the vehicle can cause will boil at a lower temperature than opening until filling is at or near sea level. If the engine is fuel vapors that can ignite either complete. turned off immediately after towing by static electricity or other . Fill the container no more at high elevation on steep uphill means. You or others could be grades, the vehicle may show signs badly burned and the vehicle than 95% full to allow for expansion. similar to engine overheating. To could be damaged. Always: avoid this, let the engine run while . Use approved fuel . Do not smoke, light parked (preferably on level ground) containers. matches, or use lighters with the transmission in P (Park) while pumping fuel. and the parking brake applied for at . Remove the container from least five minutes before turning the the vehicle, trunk, or pickup . Avoid using cell phones or engine off. If the overheat warning bed before filling. other electronic devices. comes on, see Engine Overheating . Place the container on the 0 106. ground. (Continued) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 59 Use the following chart to determine the maximum the trailer can weigh, based upon your vehicle model and options. All axles of the trailer must be equipped with brakes adequate for the intended use. Trailer braking equipment conforming to Canadian Standards Association (CSA) requirement CAN3-D313, or its equivalent, is recommended. 2500/3500 Series Pickup Models – SAE J2807 Compliant Vehicle Axle Ratio Max. Trailer Wt.5 GCWR * C-2500 Pickup Models – 2WD Pickup Model Double Cab 3.73 7 439 kg (16,400 lb) 11 476 kg (25,300 lb) Standard Box 1 Pickup Model Crew Cab Standard 3.73 6 985 kg (15,400 lb) 11 476 kg (25,300 lb) Box 1 Pickup Model Regular Cab Long 3.73 8 210 kg (18,100 lb) 11 476 kg (25,300 lb) Box 2 Pickup Model Double Cab Long 3.73 7 121 kg (15,700 lb) 11 476 kg (25,300 lb) Box 2 Pickup Model Crew Cab Long 3.73 6 713 kg (14,800 lb) 11 476 kg (25,300 lb) Box 2 K-2500 Pickup Models – 4WD Pickup Model Double Cab 3.73 6 532 kg (14,400 lb) 11 476 kg (25,300 lb) Standard Box 1 Pickup Model Crew Cab Standard 3.73 6 123 kg (13,500 lb) 11 476 kg (25,300 lb) Box 1 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

60 Driving and Operating

2500/3500 Series Pickup Models – SAE J2807 Compliant Vehicle Axle Ratio Max. Trailer Wt.5 GCWR * Pickup Model Regular Cab Long 3.73 7 212 kg (15,900 lb) 11 476 kg (25,300 lb) Box 2 Pickup Model Double Cab Long 3.73 6 214 kg (13,700 lb) 11 476 kg (25,300 lb) Box 2 Pickup Model Crew Cab Long 3.73 5 625 kg (12,400 lb) 11 476 kg (25,300 lb) Box 2 C-3500 Pickup Model Double Cab Long Box – 2WD Single Rear Wheels 2 3.73 7 938 kg (17,500 lb) 11 476 kg (25,300 lb) Dual Rear Wheels 3 3.73 10 523 kg (23,200 lb) 14 197 kg (31,300 lb) C-3500 Pickup Model Crew Cab Standard Box – 2WD Single Rear Wheels 1 3.73 7 938 kg (17,500 lb) 11 476 kg (25,300 lb) C-3500 Pickup Model Crew Cab Long Box – 2WD Single Rear Wheels 2 3.73 7 893 kg (17,400 lb) 11 476 kg (25,300 lb) Dual Rear Wheels 3 3.73 10 478 kg (23,100 lb) 14 197 kg (31,300 lb) K-3500 Pickup Model Regular Cab Long Box – 4WD Single Rear Wheels 2 3.73 7 983 kg (17,600 lb) 11 476 kg (25,300 lb) Dual Rear Wheels 3 3.73 10 569 kg (23,300 lb) 14 197 kg (31,300 lb) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

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2500/3500 Series Pickup Models – SAE J2807 Compliant Vehicle Axle Ratio Max. Trailer Wt.5 GCWR * K-3500 Pickup Model Double Cab Long Box – 4WD Single Rear Wheels 2 3.73 7 802 kg (17,200 lb) 11 476 kg (25,300 lb) Dual Rear Wheels 3 3.73 10 387 kg (22,900 lb) 14 197 kg (31,300 lb) K-3500 Pickup Model Crew Cab Standard Box – 4WD Single Rear Wheels 1 3.73 7 802 kg (17,200 lb) 11 476 kg (25,300 lb) K-3500 Pickup Model Crew Cab Long Box – 4WD Single Rear Wheels 4 3.73 7 711 kg (17,000 lb) 11 476 kg (25,300 lb) Dual Rear Wheels3 3.73 10 297 kg (22,700 lb) 14 197 kg (31,300 lb) *The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be exceeded. 1Trailer rating limited to 5 897 kg (13,000 lb) with conventional hitch. 2Trailer rating limited to 6 577 kg (14,500 lb) with conventional hitch. 3Trailer rating limited to 9 072 kg (20,000 lb) with conventional hitch. 4Trailer rating limited to 6 804 kg (15,000 lb) with conventional hitch. 5For chassis cab and pickup box delete vehicles, choose an appropriate hitch and load the truck and trailer within the limits of GCWR, GVWR, and RGAWR. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

62 Driving and Operating

C/K-3600 Series Chassis Cab Vehicle Axle Ratio Max. Trailer Wt.2 GCWR * C/K-3600 Chassis Cab – 2WD/4WD All 3.73 1 14 197 kg (31,300 lb) *The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be exceeded. 1Maximum Trailer Weight cannot be provided because total vehicle weight is unknown. 2For chassis cab and pickup box delete vehicles, choose an appropriate hitch and load the truck and trailer within the limits of GCWR, GVWR, and RGAWR.

Colorado/Canyon Pickup Models – SAE J2807 Compliant Vehicle Axle Ratio Max. Trailer Wt. GCWR * Colorado/Canyon Pickup Models – 2WD All 3.42 3 492 kg (7,700 lb) 5 761 kg (12,700 lb) Colorado/Canyon Pickup Models – 4WD Short Wheelbase Ext. Cab 3.42 3 492 kg (7,700 lb) 5 761 kg (12,700 lb) Short Wheelbase Crew Cab 3.42 3 447 kg (7,600 lb) 5 761 kg (12,700 lb) Colorado Pickup – Long 3.42 3 447 kg (7,600 lb) 5 761 kg (12,700 lb) Wheelbase Crew Cab Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

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Colorado/Canyon Pickup Models – SAE J2807 Compliant Vehicle Axle Ratio Max. Trailer Wt. GCWR * Canyon Pickup – Long 3.42 3 425 kg (7,550 lb) 5 761 kg (12,700 lb) Wheelbase Crew Cab Colorado ZR2 Models – 4WD All 3.42 2 268 kg (5,000 lb) 4 853 kg (10,700 lb) *The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be exceeded.

2500/3500 Series Van Models Vehicle Axle Ratio Max. Trailer Wt.1 GCWR * G2500 Cargo Van Short 3.42 3 175 kg (7,000 lb) 5 897 kg (13,000 lb) Wheelbase G2500 Cargo Van Long 3.42 2 767 kg (6,100 lb) 5 897 kg (13,000 lb) Wheelbase G3500 Cargo Van Short 3.42 2 812 kg (6,200 lb) 5 897 kg (13,000 lb) Wheelbase G3500 Cargo Van Long 3.42 2 722 kg (6,000 lb) 5 897 kg (13,000 lb) Wheelbase Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

64 Driving and Operating

2500/3500 Series Van Models Vehicle Axle Ratio Max. Trailer Wt.1 GCWR * G2500 Passenger Van Short 3.42 2 858 kg (6,300 lb) 5 897 kg (13,000 lb) Wheelbase G3500 Passenger Van Short 3.42 2 586 kg (5,700 lb) 5 897 kg (13,000 lb) Wheelbase G3500 Passenger Van Long 3.42 2 404 kg (5,300 lb) 5 897 kg (13,000 lb) Wheelbase *The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be exceeded. 1For Full Box Vans, choose an appropriate hitch and load the truck and trailer within the limits of GCWR, GVWR, and RGAWR.

See “Trailer Towing” in the owner Weight of the Trailer Tongue vehicle as well as trailer tongue manual for kingpin weight and trailer weight. Vehicle options, equipment, The tongue weight load (1) of any tongue weight information. passengers, and cargo in the trailer is very important because it is vehicle reduce the amount of also part of the vehicle weight. The tongue weight the vehicle can carry, Gross Vehicle Weight (GVW) which will also reduce the trailer includes the curb weight of the weight the vehicle can tow. vehicle, any cargo carried in it, and the people who will be riding in the Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 65

Colorado/Canyon Maximum Tongue Vehicle Series Hitch Type Weight 2.8L Diesel Conventional Load 349 kg (770 lb) 4x2 (ALL) 2.8L Diesel SWB Conventional Load 349 kg (770 lb) Ext. Cab 4x4 2.8L Diesel SWB/ Conventional Load 345 kg (760 lb) LWB Crew Cab 4x4

In general, trailer tongue weight (1) Do not exceed the maximum After loading the trailer, weigh the should be 10 15% and fifth-wheel – allowable tongue weight for the trailer and then the tongue, or gooseneck kingpin weight should vehicle. Choose the shortest hitch separately, to see if the weights are be 15 25% of the loaded trailer – extension that will position the hitch proper. If they are not, adjustments weight (2). Some specific trailer ball closest to the vehicle. This will might be made by moving some types, such as boat trailers, fall help reduce the effect of trailer items around in the trailer. outside of this range. Refer to the tongue weight on the rear axle. trailer owner’s manual for the If a cargo carrier is used in the recommended trailer tongue weight. Trailer rating may be limited by the trailer hitch receiver, choose a In all cases, do not exceed the vehicle's ability to carry tongue carrier that positions the load as maximum loads for the vehicle weight. Tongue or kingpin weight close to the vehicle as possible. series and hitch type. cannot cause the vehicle to exceed Make sure the total weight, the GVWR (Gross Vehicle Weight including the carrier, is no more than Rating) or the RGAWR (Rear Gross half of the maximum allowable Axle Weight Rating). See “Total tongue weight for the vehicle or Weight on the Vehicle's Tires” in the 227 kg (500 lb), whichever is less. owner manual. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

66 Driving and Operating Primary PTO Operating Modes Conversions and Caution Add-Ons PTO modes of operation are: Engine exhaust contains Carbon . Preset Power Take-Off (PTO) Monoxide (CO), which cannot be seen or smelled. Exposure to CO Stationary operation only: In-cab If equipped, the Power Take-Off can cause unconsciousness or control is standard, remote (PTO) is a GM Upfitter integrated even death. Never operate PTO control is available. system that is used to create an in an enclosed area such as a . Variable auxiliary power source for running garage or building that has no Stationary operation only: In-cab add-on equipment, such as salt fresh air ventilation. See “Engine control is standard, remote spreaders, snow plows, winches, Exhaust” in the owner manual. control is available. and lift buckets. The PTO system controls engine speed to values . Mobile higher than normal base idle, PTO In-cab control only. load relay engagement, and remote Caution starting and shutdown of the engine. . Operator Selectable In-Cab If the key is in the ignition during Mode (OSIM) When installing PTO aftermarket Remote PTO operation, the equipment, the PTO wiring and OSIM is for in-cab operation recommendations vehicle can be shifted out of operation only. provided by the service manual and P (Park). Even though PTO will be disengaged, depending on OSIM is for vehicles that require GM Upfitter documentation must be both stationary and mobile PTO Upfitter application, personal strictly followed. modes. OSIM is available via the injury or property damage may GM Service Tool only. During the Refer to the bulletins in the result from vehicle movement. Upfitter Integration website configuration of OSIM, two Always remove the key from the www.gmupfitter.com for the Power modes must be paired. The ignition before operating Take Off (PTO) operating options for pairing are: stationary description and application guide. Remote PTO. preset and mobile, or stationary variable and mobile. During activation of OSIM, the operator Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 67 must select one of the two All PTO modes provide for safety relay becomes engaged and modes within the pre-configured interlocks for PTO load will then be on steady. The pairing. If an OSIM mode is not disengagement. engine will advance to the PTO selected, PTO will not operate. Remote PTO modes provide for Standby Speed. OSIM modes of operation are: remote engine starting and 4. Once the PTO Standby Speed shutdown. is reached, use SET− and ‐ Stationary +RES on the cruise control to For stationary mode, the Stationary in-cab and Remote PTO modes provide for engine shutdown reach the Set 1 or Set 2 PTO configuration may be engine speeds. stationary preset or stationary due to critical engine conditions, as variable. well as a timed engine shutdown The accelerator pedal is feature. disabled and cannot be used to ‐ Mobile override the PTO preset Preset PTO For mobile mode, the speeds. configuration is variable only. Preset Enable Conditions – Factory Default PTO Engine In-Cab Operation Selection between OSIM Speeds pairings is not available. To enable PTO: Standby 900 rpm Remote modes are not 1. With the engine running, shift Set 1 (SET−) 1200 rpm available. the vehicle into P (Park) and set the parking brake. Do not Set 2 (+RES) 1900 rpm The factory default programming press the brake pedal. enables in-cab control. For The first time a vehicle is used 2. Confirm that cruise control stationary modes, a GM Service for PTO: Tool can reprogram the system to is off. 1. The PTO Control setting on the allow for remote control and disable 3. Press and release the PTO GM Service Tool is the in-cab control. in-cab switch below the climate programmed to Interior Mode controls in the center stack. All PTO modes provide for engine PTO Switch. rpm control and PTO load relay The PTO indicator light will control. blink rapidly until the PTO load Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

68 Driving and Operating 2. Check the correct operation of 2. Set the parking brake and shift Preset Enable Conditions – the default PTO preset the transmission into P (Park). Remote Operation In-Cab Enable stationary mode to observe the 3. Turn the engine off. Remove or This requires programming with the three idle up speeds. The PTO place the key in the ignition off GM Service Tool and remote switch function should be confirmed position. Lock the vehicle, panel provided by GM Upfitter. before any wiring modifications if desired. are done or any Starting remote operation in-cab: reprogramming is attempted. 4. Confirm the hood is closed. 1. With the engine running, shift See your dealer if the default 5. From outside the vehicle, press the vehicle into P (Park), presets are not functioning and release the Remote PTO release the brake pedal, and properly. Arm switch. set the parking brake. 3. The PTO indicator light will not 6. Within five seconds, open and 2. Confirm that cruise control initially reflect the status of the close the Remote PTO Engine is off. PTO load until the PTO load Start/Shutdown switch. relay is wired into the system. 3. Confirm the hood is closed. The PTO load relay output is 7. The horn will chirp, and then 4. Press and release the in-cab enabled as a factory default. engine starting will be PTO switch. When the PTO indicator light is automatically initiated. The either blinking or on solid, the PTO system will then elevate 5. The horn will chirp, the PTO PTO relay output will be engine rpm to PTO Standby load relay will engage, and the activated. Speed and engage the PTO engine will advance to the PTO load relay. Standby Speed. Preset Enable Conditions – Remote Operation 8. The Remote PTO Set switch 6. The Remote PTO Set switch can now be used to accomplish may be used to select PTO Set This requires programming with the the PTO Set 1 and Set 2 1 and Set 2 engine speeds. GM Service Tool and remote switch engine speeds. panel provided by GM Upfitter. The accelerator pedal is disabled The accelerator pedal is when Remote PTO operation is 1. Confirm that cruise control disabled when Remote PTO selected. is off. operation is selected. The operator may exit the vehicle. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 69 Preset Enable Conditions – cruise control to select the PTO { Warning Operator Selectable In-Cab Set 1 speed. Press and release Mode (OSIM) +RES on the cruise control to If the key is in the ignition during select the PTO Set 2 speed. Remote PTO operation, the This requires programming with the vehicle can be shifted out of GM Service Tool and requires . The PTO load relay engages P (Park) by an unauthorized pairing OSIM stationary preset with immediately when the PTO operator. Even though PTO will OSIM mobile mode. If OSIM pairing operation is initiated by the be disengaged, depending on has been configured, initiate OSIM switch input. The transmission preset operation: torque converter is unlocked. PTO Upfitter application, personal The torque converter will lock injury or property damage may 1. With the engine running, shift the vehicle into P (Park) and upon reaching stable PTO result from vehicle movement. Standby Speed (default = 900 The operator must ensure that the release the brake pedal, and set the parking brake. rpm) so maximum power is vehicle is secured against available. unauthorized access during 2. Confirm cruise control is off. Remote PTO operation. . The first elevated engine speed, 3. Confirm the hood is closed. PTO Standby Speed, is not 4. Press and release the in-cab intended as a working speed but Remote PTO operation may be PTO switch. The PTO indicator as a verification that the system ended by pressing the brake pedal light will blink slowly. is active and ready to go to a at which time the PTO load relay working speed. This speed can disengages and the engine returns 5. Within 10 seconds, press and be modified to a working speed to base idle speed. The operator release SET− on the cruise with the GM Service Tool. The may drive the vehicle after releasing control. upper limit for PTO Standby the park brake. 6. The PTO indicator light will Speed is 1500 rpm. change to solid when the PTO . The remote switches and relay load relay becomes engaged. connections are made at the The engine speed will advance PTO Upfitter Connector located to the PTO Standby Speed. on the chassis frame behind Press and release SET− on the the cab. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

70 Driving and Operating . The PTO Control setting on the relay becomes engaged and 1. Confirm that cruise control Service Tool must be will then be on steady. The is off. programmed to Remote PTO engine will advance to the PTO 2. Set the parking brake and shift Mode Switch before the remote Standby Speed. the transmission into P (Park). switches can be used. 3. Once PTO Standby Speed is 3. Turn the engine off. Remove or . The PTO relay is programmed to reached, SET− and +RES on place the key in the ignition off be enabled in the factory default the cruise control can be used position. Lock the vehicle, configuration. to tap up and tap down the if desired. engine speed. Factory setting . Refer to the service manual or 4. The hood must be closed. go to the Upfitter Integration for the tap step is 100 rpm and website www.gmupfitter.com for the setting for the ramp rate is 5. From outside the vehicle, press details, advanced programming 150 rpm/sec. The GM Service and release the Remote PTO features, and usage with a Tool can enable the capability Arm switch. removable pendant. to change the default value for tap step via the Radio 6. Within five seconds, open and Variable PTO Customization menu. The close the Remote PTO Engine default values for both tap step Start/Shutdown switch. Variable Enable Conditions – and ramp rate can be changed In-Cab Operation 7. The horn will chirp, and then with the GM Service Tool. The engine starting will be To enable PTO: accelerator pedal is disabled, automatically initiated. The 1. With the engine running, shift and cannot be used to control PTO system will then elevate the vehicle into P (Park) and PTO engine speed. engine rpm to PTO Standby set the parking brake. Do not Variable Enable Conditions – Speed and engage the PTO press the brake pedal. Remote Operation load relay. 2. Press and release the PTO This requires programming with the in-cab switch below the climate GM Service Tool and the controls in the center stack. appropriate remote switch panel The PTO indicator light will provided by GM Upfitter. blink rapidly until the PTO load Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 71 Variable Enable Conditions – . The desired engine operating Remote Operation In-Cab Enable { Warning speed can now be Starting Remote Operation from accomplished. Two versions of In-Cab If the key is in the ignition during engine rpm control are available, Remote PTO operation, the switches or potentiometer, This requires programming with the vehicle can be shifted out of GM Service Tool and remote switch depending on which one was P (Park) by an unauthorized installed. panel provided by GM Upfitter. operator. Even though PTO will 1. With the engine running, shift be disengaged, depending on ‐ Switches – the Remote PTO Set and Resume switches can the vehicle into P (Park), PTO Upfitter application, personal be used to tap up and tap release the brake pedal, and injury or property damage may set the parking brake. down to the desired engine result from vehicle movement. speed. 2. Confirm cruise control is off. The operator must ensure that the vehicle is secured against ‐ Potentiometer – a Remote 3. Confirm the hood is closed. unauthorized access during PTO Throttle Potentiometer 4. Press and release the PTO Remote PTO operation. can be used as a continuous in-cab switch. variable throttle control to dial in the desired engine speed. 5. The horn will chirp, the PTO The accelerator pedal is disabled load relay will engage, and the when Remote PTO operation is Variable Enable Conditions engine will advance to the PTO selected. – OSIM Standby Speed. Remote PTO operation can be This requires programming with the The operator may exit the vehicle. ended by pressing the brake pedal. GM Service Tool and specific The PTO load relay disengages and pairing of stationary variable and the engine returns to base idle mobile modes. Remote operation is speed. The operator may drive the not available. vehicle after releasing the park brake. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

72 Driving and Operating If OSIM pairing has been torque converter is unlocked. . Factory setting for the tap step is configured, initiate OSIM stationary The torque converter will lock 100 rpm and the setting for ramp variable operation: upon reaching stable PTO rate is 150 rpm/sec. The default 1. With the engine running, shift Standby Speed (default = 900 value for tap step can be the vehicle into P (Park), rpm) so maximum power is modified via the Radio release the brake pedal, and available. Customization menu. The set the parking brake. . The first elevated engine speed, default values for both tap step and ramp rate can be changed 2. Confirm cruise control is off. PTO Standby Speed, is not intended as a working speed but with the GM Service Tool. 3. Confirm the hood is closed. as a verification that the system . The PTO load relay is enabled 4. Press and release the PTO is active and ready to go to a as the factory default in-cab switch. The PTO working speed. programmed setting. indicator light will blink slowly. . The relay connections are made . Refer to the service manual or 5. Within 10 seconds, press and at the PTO Upfitter Connector go to the GM Upfitter Integration release SET− on the cruise located on the chassis frame website www.gmupfitter.com for control. The PTO load relay will behind the cab. details. engage and the PTO indicator . The engine speeds can be Mobile PTO light will change to solid. The adjusted between the low of engine speed will advance to PTO Standby Speed and the Mobile Enable Conditions – the PTO Standby Speed. high of PTO Max Engine speed In-Cab Operation Only 6. The desired operating speed limits. Both values can be This requires programming with the may be achieved by tapping up modified from the factory default GM Service Tool. settings with the GM Service and down with +RES and SET 1. The engine must be running. − on the cruise control. Tool. Based on the value chosen for PTO Max Engine Speed, the 2. The parking brake must be . The PTO load relay engages PTO menu in the center stack released. immediately when the PTO may show speeds that are not 3. Confirm that cruise control operation is initiated by the available. switch input. The transmission is off. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 73 4. Engine rpm must be less than 1500 rpm, the PTO relay will used to capture and maintain 1500 rpm. not engage until the engine that speed. Normal tap up 5. Shift the transmission to M1, rpm drops below 1500 rpm. and tap down can then be M2, or M3. 9. Once engaged, if additional used to fine tune the setting. 6. Tap the brake pedal and then engine speed is desired, use In Mobile PTO mode, the vehicle do not press the brake pedal. either the cruise control or the speed achieved is the result of the accelerator pedal to temporarily current engine speed requested and 7. Keep the driver door closed. adjust the engine speed. the transmission gear range The driver door can be kept selected. When the vehicle is open if reconfigured using the ‐ +RES on the cruise control can be used to tap up, or if placed in M2 or M3, the vehicle will GM Service Tool. See upshift according to engine rpm set www.gmupfitter.com. continuously held to ramp up, to the desired operating point, and vehicle speed will 8. Press and release the PTO speed. SET− on the cruise increase. To prevent upshifts and in-cab switch below the climate control can be used to tap maintain lower vehicle speeds, controls in the center stack. down or coast down if place the vehicle in M1. Then within 10 seconds press continuously held to the Mobile Enable Conditions – and release +RES on the desired engine speed. Top Operator Selectable In-Cab cruise control. The PTO limit is PTO Max Engine Mode (OSIM) indicator light will blink slowly Speed, default 2100 rpm and This requires programming with the between presses. The PTO programmable to 2900 rpm. indicator light will then blink GM Service Tool and specific Lower limit is PTO Standby pairing mobile mode with either rapidly until the PTO load Speed, default 900 rpm with becomes engaged, and then stationary preset or variable. program range from base Remote operation is not available. come on steady. The engine idle to 900 rpm. speed will remain at the current See “Mobile PTO” previously in this throttle setting or advance to ‐ The accelerator pedal can be section. PTO Standby Speed, used to achieve the desired whichever value is greater. speed. When the desired If the engine rpm is above speed is reached, SET− on the cruise control would be Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

74 Driving and Operating PTO System Disengage that a PTO set speed is still Power Take Off (PTO) operating Conditions stored in memory. Activating description and application +RES on the cruise control will guide. Preset or Variable Stationary restore engine rpm to the last Modes – In-Cab Operation . With the key in the ignition and PTO set speed. rotated to the RUN position, To disengage PTO, do one of the . Press and release the PTO press the brake pedal. The PTO following: in-cab switch. The PTO load load relay disengages and the . Press the brake pedal. The relay disengages and the engine engine returns to base idle engine returns to base idle, but returns to base idle. The PTO speed. The operator may drive the PTO load relay remains indicator light will turn off, the vehicle. engaged. The PTO indicator indicating the PTO load relay is Stationary Modes will also light will blink slowly indicating disengaged and the stored set disengage if: that a PTO set speed is still speed has been cleared from stored in memory. Upon memory. . Vehicle movement is detected. releasing the brake, the factory Stationary Modes (Preset or . The parking brake is released. default programming is for the Variable) – Remote Control engine speed to remain at curb . The transmission is shifted out idle. A press and release of To disengage PTO: of P (Park). +RES on the cruise control will . Open the Remote PTO Engine . The ignition is cycled from RUN restore engine rpm to the last Start/Shutdown switch. Load to OFF. PTO set speed. The PTO relay disengages and the engine . The PTO feedback signal is lost system can also be programmed will stop. indicating the load is disengaged to return engine rpm to the PTO if used. See Standby Speed setting. . If equipped, press the PTO Emergency Stop switch. Load www.gmupfitter.com. . Press * on the cruise control. relay disengages and the engine . Cruise control becomes enabled. The engine returns to base idle, will stop. Refer to the bulletins in but the PTO load relay remains the Upfitter Integration website . Timed auto-engine shutdown: engaged. The PTO indicator www.gmupfitter.com for the This feature will shut down the light will blink slowly indicating engine automatically after a Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 75 predefined time. PTO must be When Remote PTO engine starting unless the accelerator pedal is operational for this function to be has been initialized with the ignition pressed. The PTO load relay active. key in the RUN position, the shift remains engaged. The PTO . Engine shutdown based on lever will remain locked if the brake indicator light will blink slowly critical engine or PTO system pedal is pressed and a shift from indicating that a PTO set speed fault conditions: This feature will P (Park) is attempted while the is still stored in memory. Upon shut down the engine when PTO engine is running and PTO is active releasing the brake, the factory is operating if a critical engine (standby mode). A shift out of default programming is for the condition such as low oil, low oil P (Park) will not be allowed until one engine speed to remain at curb pressure, hot engine, hot of the following actions is taken by idle awaiting an input from +RES transmission, low fuel, or Diesel the vehicle operator: on the cruise control to restore Particulate Filter regeneration is . Press the Remote PTO Engine engine rpm to the last PTO set detected by the vehicle system. Start/Shutdown switch. speed. The system can also be programmed to return engine If PTO operation is continued . Press the PTO in-cab switch when critical engine conditions rpm to the PTO Standby Speed (only if the PTO in-cab Remote setting. are present, a horn chirp Start/Stop feature is enabled). warning will occur after 30– This requires programming with . Press * on the cruise control. 60 seconds. The engine will shut the GM Service Tool. The engine returns to base idle, down two minutes after the horn but the PTO load relay remains warning. The engine can be . Press 5 on the cruise control. engaged. The PTO indicator restarted with the ignition key or . Release the parking brake. light will blink slowly indicating with the Remote PTO engine that a PTO set speed is still start controls. The horn warning Mobile Mode stored in memory. Pressing and engine shutdown will again To disengage PTO: +RES on the cruise control will occur if the critical engine restore engine rpm to the last condition is still present. . Press the brake pedal. The PTO PTO set speed. system releases control of Resume memory speed is cleared engine speed, but the PTO load . Press the PTO in-cab switch. for the above actions. relay remains engaged. The Load relay disengages and the engine will return to base idle engine returns to base idle. The Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

76 Driving and Operating PTO indicator light will turn off, . 5 on the cruise control is Prolonged or Extended PTO indicating the PTO load relay is pressed. Operation disengaged and the stored set speed has been cleared from . The parking brake is applied. When operating the vehicle in stationary PTO mode, the Diesel memory. . The shift lever is moved out of Particulate Filter (DPF) will continue manual shift selection, M1, Mobile Mode will also disengage if: to filter the exhaust and accumulate M2, or M3. . PTO feedback input is lost. The soot. The engine control system, engine speed is returned to the Resume memory speed is cleared depending on the speed and load PTO Standby speed setting and for the above actions. being applied by the PTO, may not the load is still engaged. This is Although the PTO system attempts be able to generate enough energy configurable with the GM to limit accelerator and PTO switch or adequate heat needed to Service Tool. inputs to comply with maximum automatically clean or regenerate the DPF. If manual regeneration is . Vehicle Speed exceeds Max speed and/or rpm parameters, some vehicle operating conditions such as not initiated, continued operation Vehicle Speed. Factory default under conditions that do not allow setting = 94 km/h (58 mph). PTO downhill acceleration can cause the vehicle speed or engine rpm to effective regeneration or cleaning relay will re-engage and will eventually plug the DPF and advance to the last engine exceed these limits. In those cases, the PTO system may disengage. result in reduced power. The speed stored in memory when ENGINE POWER IS REDUCED both the Vehicle Speed is Operator Selectable In-Cab Driver Information Center (DIC) reduced below 94 km/h (58 mph) Mode (OSIM) message and malfunction indicator and the engine speed ramps To disable OSIM Stationary PTO: lamp will be displayed, and dealer down below the maximum PTO service will be required to return the engagement speed (1500 rpm . Press and release the PTO vehicle to normal, full power factory default setting). in-cab switch. operation. To prevent this from . Engine Speed exceeds Max To disable OSIM Mobile PTO: occurring, frequently monitor the vehicle during stationary PTO Engine Speed for more than . Press and release the PTO operation, paying particular attention 15 seconds. Factory default in-cab switch. setting = 2100 rpm. to any horn chirps and/or the Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 77 CLEAN EXHAUST FILTER SEE TAP DOWN : Press and release previous PTO set speed has been OWNER MANUAL NOW DIC SET− on the cruise control to retained in memory. Press and warning messages. If the DIC reduce the engine speed by release +RES on the cruise control message is displayed during PTO increments of 100 rpm. The tap to resume the previous PTO set operation, see Diesel Particulate down engine speed increments can speed. 0 Filter 34 for information on how to be adjusted by the GM Service Tool. TAP UP : Press and release +RES clean or regenerate the DPF. The Service Tool can enable the on the cruise control to increase the option for adjustment of tap down engine speed by increments of 100 PTO Operational Speed engine speed increments through Control rpm (factory preset value). The tap the Radio Customization menu. up engine speed increments can be Variable PTO operational speed COAST : Press and hold SET− on adjusted by the GM Service Tool. control provides the following the cruise control to reduce the rpm The Service Tool can enable the functions: at 150 rpm/sec until the desired option for adjustment of tap up Cruise Control SET− (In-Cab) or engine speed is reached or until the engine speed increments through Remote PTO Set 1 Switch initial PTO Standby Speed is the Radio Customization menu. reached. SET : Press and hold the ACCEL : Press and hold +RES on accelerator to obtain the desired In-Cab Cruise Control +RES or the cruise control to increase the engine speed, then press and Remote PTO Set 2 Switch rpm by 150 rpm/sec until the release SET− on the cruise control. RESUME : After a PTO set speed desired engine speed is reached or The current engine speed will be has been met, a Resume Speed until the maximum allowable PTO maintained. This action can be message is retained after an set speed is reached. Alternatively, repeated as desired to capture a application of the brake pedal. the engine speed acceleration can higher rpm value. The PTO set Engine speed will reduce to basic be adjusted through the Radio speed cannot exceed 2900 rpm. idle speed. The PTO indicator light Customization menu. will blink slowly indicating the Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

78 Driving and Operating 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 PTO Load Feedback DISABLED DISABLED ENABLED PTO Relay ENABLED DISABLED ENABLED Keep PTO Relay Engaged ENABLED DISABLED ENABLED during Braking or upon Pressing * Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 79

Programmable Factory Setting Minimum Value Maximum Value Parameters 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 64 km/h (40 mph) if this is programmed with the GM Service Tool. 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 2900 rpm 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 1900 rpm 2900 rpm Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

80 Driving and Operating

Programmable Factory Setting Minimum Value Maximum Value Parameters Engine Speed Tap Step 100 rpm 4 rpm 500 rpm Engine Speed Ramp Rate 150 rpm 4 rpm 150 rpm 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) 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 Personalization Menu ENABLED DISABLED ENABLED Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 81

Programmable Factory Setting Minimum Value Maximum Value Parameters Standby Speed Menu DISABLED DISABLED ENABLED Set 1 Speed Menu DISABLED DISABLED ENABLED (In Stationary Preset) Set 2 Speed Menu DISABLED DISABLED ENABLED (In Stationary Preset) Engine Run Shutdown DISABLED DISABLED ENABLED Time Menu (In Stationary Preset) Engine Speed Tap DISABLED 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 10 Minutes 13 Minutes Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

82 Driving and Operating

Programmable Factory Setting Minimum Value Maximum Value Parameters Driver Door Status Usage ENABLED DISABLED ENABLED Remote PTO In Cab DISABLED DISABLED ENABLED Control

If the PTO factory preset Driver Information Center (DIC) . PTO: REDUCE VEHICLE parameters do not match the Warning Messages SPEED settings described above, then they . PTO: REDUCE ENGINE SPEED may have already been altered in If the PTO indicator light does not order to satisfy the requirements of remain on, it indicates that not all . PTO: DISENGAGE CRUISE the installed PTO system and body PTO enabling conditions have been CONTROL equipment. met. One or more of the following DIC messages may display if the . PTO: ACCELERATION UPON The following PTO settings are also PTO will not engage and the BRAKE RELEASE offered via the vehicle customization appropriate action must be taken. . PTO: SERVICE PTO screens, which can be enabled by your service technician. These . PTO: SHIFT TO PARK (P) . PTO: SHIFT TO M1, M2 OR M3 include the following parameters: (Stationary mode only) (Mobile mode only) . PTO Standby rpm . PTO: SET PARK BRAKE . Action Required Cleaning (Stationary mode only) Exhaust Filter Continue Driving . PTO Set 1 Speed . PTO: PRESS & RELEASE (DPF only) . PTO Set 2 Speed BRAKE (Mobile mode only) . Action Required Cleaning . Tap Step Speed . PTO: RELEASE BRAKE TO Exhaust Filter Must Continue Driving (DPF only) . PTO Engine Run Timer ENGAGE PTO Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Driving and Operating 83 . Exhaust Filter Cleaning See www.gmupfitter.com for Manual regeneration can only be Available Go to Options Menu information on the installation of used when the DPF has become at (DPF only) wiring and programming for PTO least 90% full. At 100% full, it will In addition, the PTO indicator light aftermarket equipment. attempt to automatically self-clean if proper driving conditions are met. will light when all conditions Diesel Particulate Filter required to engage PTO have not The DPF will clean itself if the Cleaning during PTO vehicle can be driven above been met. When enabling PTO, the Operation PTO indicator light will turn on, then 50 km/h (30 mph) for about turn off after one second. Under This feature is only available on 30 minutes. normal operating conditions, the Fleet and Commercial vehicles. To Manual regeneration can be used PTO indicator light will remain on verify that the vehicle has this during a stationary PTO session. throughout the PTO operating cycle. feature, see www.gmupfitter.com to However it is strongly recommended contact the GM Upfitter Integration that the exhaust filter be cleaned Additional in-vehicle PTO module Group for assistance. information can be accessed by the before continuous PTO. If manual service technician to aid in If equipped, this feature allows for regeneration is operating troubleshooting. Also see the manual cleaning/regeneration of the concurrently with PTO then the PTO service manual for more Diesel Particulate Filter (DPF) when system will retain control of the information. it is unable to clean itself. It may be engine speed. Low PTO engine necessary to perform a manual speeds will cause regeneration to The GM service technician can regeneration if driving conditions — take longer. To initiate a manual access Service Tool information that such as extended slow speed, DPF regeneration, see “Manual will contain reasons why PTO may stop-and-go traffic, extended idles, Regeneration of Diesel Particulate not engage and why PTO may short drive cycles, or stationary PTO Filter” under Diesel Particulate Filter. unexpectedly disengage due to operation — prevent DPF system conditions. self-cleaning. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

84 Vehicle Care General Information Damage to vehicle components Vehicle Care resulting from modifications or the Accessories and installation or use of non-GM General Information certified parts, including control Modifications module or software modifications, is Accessories and not covered under the terms of the Modifications ...... 84 Adding non-dealer accessories or vehicle warranty and may affect making modifications to the vehicle remaining warranty coverage for Vehicle Checks can affect vehicle performance and affected parts. Engine Compartment safety, including such things as Overview ...... 86 airbags, braking, stability, ride and GM Accessories are designed to Engine Oil ...... 91 handling, emissions systems, complement and function with other Engine Oil Life System ...... 95 aerodynamics, durability, and systems on the vehicle. See your Automatic Transmission electronic systems like antilock dealer to accessorize the vehicle Fluid ...... 95 brakes, traction control, and stability using genuine GM Accessories Engine Air Cleaner/Filter ...... 99 control. These accessories or installed by a dealer technician. Cooling System ...... 102 modifications could even cause See the warranty manual. Engine Overheating ...... 106 malfunction or damage not covered Battery (4-Cylinder by the vehicle warranty. Pickup Only) ...... 107 Electrical System Engine Compartment Fuse Block ...... 108 Appearance Care Exterior Care ...... 119 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 85 Aftermarket Engine Engine power enhancement Performance Enhancement products may enable the engine to Products and Modifications operate at horsepower and torque levels that could damage, create Some aftermarket engine failure, or reduce the life of the performance products and engine, engine emission system, modifications promise a way to transmission, and drivetrain. increase the horsepower and torque Damage, failure, or reduced life of levels of the vehicle's powertrain. the engine, transmission, emission You should be aware that these system, drivetrain, or other vehicle products could have harmful effects components caused by aftermarket on the performance and life of the engine performance enhancement engine, exhaust emission system, products or modifications might not transmission, and drivetrain. The be covered under the vehicle engines, transmissions, and warranty. drivetrains have been designed and built to offer industry leading durability and performance in the most demanding applications. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

86 Vehicle Care Vehicle Checks Engine Compartment Overview

2.8L 4-Cylinder Engine Pickup Models Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 87 1. Coolant Surge Tank and 4. Engine Fan (Out of View) 7. Brake Fluid Reservoir Pressure Cap 5. Engine Oil Dipstick 8. Windshield Washer Fluid 2. Engine Air Cleaner/Filter 6. Engine Compartment Fuse Reservoir 3. Engine Oil Fill Cap Block 9. Battery Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

88 Vehicle Care

6.6L 8-Cylinder Engine Pickup Models Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 89 1. Battery 6. Engine Fan (Out of View) 12. Windshield Washer Fluid 2. Engine Air Cleaner/Filter 7. Automatic Transmission Reservoir 3. Coolant Surge Tank and Dipstick 13. Auxiliary Battery Pressure Cap 8. Engine Oil Fill Cap 14. Engine Compartment Fuse 4. Remote Positive (+) Terminal 9. Power Steering Fluid Reservoir Block 5. Diesel Exhaust Fluid (DEF) 10. Engine Oil Dipstick 15. Remote Negative (-) Terminal Fill Tube 11. Brake Fluid Reservoir Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

90 Vehicle Care

2.8L 4-Cylinder Engine Van Models Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 91 1. Battery . Check the engine oil level If a low oil Driver Information Center 2. Coolant Surge Tank and regularly and maintain the (DIC) message displays, check the Pressure Cap proper oil level. See “Checking oil level. Engine Oil” and “When to Add Follow these guidelines: 3. Engine Fan (Out of View) Engine Oil” in this section. 4. Engine Oil Fill Cap . To get an accurate reading, park . Change the engine oil at the the vehicle on level ground. 5. Engine Oil Dipstick appropriate time. See “Engine Check the engine oil level after Oil Life System” in the owner’s 6. Engine Air Cleaner/Filter the engine has been off for at manual. least two hours. Checking the 7. Engine Compartment Fuse Box . Always dispose of engine oil engine oil level on steep grades 8. Power Steering Fluid Reservoir properly. See “What to Do with or too soon after engine shutoff Used Oil” in this section. can result in incorrect readings. 9. Brake Fluid Reservoir Accuracy improves when 10. Windshield Washer Fluid Checking Engine Oil checking a cold engine prior to Reservoir Check the engine oil level regularly, starting. Remove the dipstick every 650 km (400 mi), especially and check the level. Engine Oil prior to a long trip. The engine oil . If unable to wait two hours, the dipstick handle is a loop. See To ensure proper engine engine must be off for at least Engine Compartment Overview 0 86 performance and long life, careful 15 minutes if the engine is for the location. attention must be paid to engine oil. warm, or at least 30 minutes if Following these simple, but the engine is not warm. Pull out important steps will help protect { Warning the dipstick, wipe it with a clean your investment: paper towel or cloth, then push it The engine oil dipstick handle back in all the way. Remove it . Use engine oil approved to the may be hot; it could burn you. again, keeping the tip down, and proper specification and of the Use a towel or glove to touch the check the level. proper viscosity grade. See dipstick handle. “Selecting the Right Engine Oil” in this section. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

92 Vehicle Care When to Add Engine Oil Selecting the Right Engine Oil Caution (Continued) (2.8L 4-Cylinder Engine) have an oil level above the Selecting the right engine oil operating range, i.e., the engine depends on both the proper oil has so much oil that the oil level specification and viscosity grade. gets above the cross-hatched See Recommended Fluids and area that shows the proper Lubricants 0 126. operating range, the engine could Specification If the oil is below the cross-hatched be damaged. You should drain area at the tip of the dipstick and out the excess oil or limit driving Ask for and use engine oils that the engine has been off for at least of the vehicle and seek a service meet the dexos2 specification. 15 minutes, add 1 L (1 qt) of the professional to remove the Engine oils that have been approved by GM as meeting the recommended oil and then recheck excess amount of oil. the level. See “Selecting the Right dexos2 specification are marked Engine Oil” later in this section for with the dexos2 approved logo. See an explanation of what kind of oil to See Engine Compartment Overview www.gmdexos.com. 0 use. For engine oil crankcase 86 for the location of the engine Use of Substitute Engine Oils if capacity, see Capacities and oil fill cap. dexos2 is unavailable: In the event 0 Specifications 131. Be sure to add enough oil to put the that dexos2-approved engine oil is level somewhere in the proper not available at an oil change or for Caution operating range. Push the dipstick maintaining proper oil level, you all the way back in when through. may use substitute engine oil that Do not add too much oil. Oil meets ACEA C3 of the appropriate levels above or below the viscosity grade. acceptable operating range shown on the dipstick are harmful to the engine. If you find that you (Continued) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 93 will provide easier cold starting for the engine at extremely low temperatures. When selecting an oil of the appropriate viscosity grade, it is recommended to select an oil of the correct specification. See “Specification” earlier in this section. Caution Engine Oil Additives/Engine Oil Flushes dexos2 Failure to use the recommended — engine oil or equivalent can result Do not add anything to the oil. The in engine damage not covered by recommended oils meeting the the vehicle warranty. dexos2 specification are all that is needed for good performance and engine protection. Viscosity Grade Engine oil system flushes are not Use SAE 5W-30 viscosity grade recommended and could cause engine oil. engine damage not covered by the vehicle warranty. Selecting the Right Engine Oil (6.6L 8-Cylinder Engine) Specification Oils designated as API CJ-4 or Cold Temperature Operation: In an CK-4 are required for the vehicle. area of extreme cold, where the The CJ-4 or CK-4 designation can temperature falls below −29 °C appear either alone or in (−20 °F), an SAE 0W-40 oil may be combination with other American used. An oil of this viscosity grade Petroleum Institute (API) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

94 Vehicle Care designations, such as API CJ-4/SL. Look for this on the oil container, These letters show API levels of and use only those oils that display quality. this logo.

Caution

Use only engine oils that have the designation CJ-4 for the diesel engine. Failure to use the recommended oil can damage the DPF and result in engine damage not covered by the vehicle warranty.

Viscosity Grade American Petroleum Institute (API) Use SAE 15W-40 viscosity grade Symbol engine oil. This doughnut-shaped logo (symbol) is used on most oil containers to help you select the correct oil. It means that the oil has been certified by the American Petroleum Institute. When it is very cold, below −18 °C (0 °F), use SAE 5W-40 to improve cold starting. These numbers on the oil container show its viscosity, or thickness. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 95 When selecting an oil of the containing used engine oil. See the Automatic Transmission appropriate viscosity grade, always manufacturer's warnings about the select an oil of the correct use and disposal of oil products. Fluid specification. See “Specification” Used oil can be a threat to the When to Check and Change earlier in this section. environment. If you change your (2.8L 4-Cylinder Engine Pickup Engine Oil Additives/Engine Oil own oil, be sure to drain all the oil Models) from the filter before disposal. Never Flushes — API See Automatic Transmission Fluid dispose of oil by putting it in the “ ” in the owner s manual. Do not add anything to the oil. The trash or pouring it on the ground, ’ recommended oils with the API into sewers, or into streams or When to Check and Change service symbol are all that is bodies of water. Recycle it by taking needed for good performance and (6.6L 8-Cylinder Engine Pickup it to a place that collects used oil. engine protection. Models) Engine oil system flushes are not Engine Oil Life System Change the fluid and filter at the recommended and could cause intervals listed. See Maintenance engine damage not covered by the The engine oil life system calculates Schedule 0 122. vehicle warranty. engine oil life based on vehicle use and displays the CHANGE ENGINE Use the transmission fluid listed in What to Do with Used Oil OIL SOON message when it is time Recommended Fluids and Lubricants 0 126. Used engine oil contains certain to change the engine oil and filter. elements that can be unhealthy for The oil life system should be reset How to Check to 100% only following an oil your skin and could even cause Because this operation can be a cancer. Do not let used oil stay on change. See “Engine Oil Life System” in the owner’s manual. little difficult, the decision may be your skin for very long. Clean your made to have this done by your skin and nails with soap and water, dealer. or a good hand cleaner. Wash or properly dispose of clothing or rags If the decision is made to perform this operation, be sure to follow all the instructions here, or a false reading on the dipstick could result. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

96 Vehicle Care Checking the Fluid Level Then, without shutting off the Caution Prepare the vehicle as follows: engine, follow these steps: Too much or too little fluid can 1. Park the vehicle on a level Cold Check Procedure damage the transmission. Too place. Keep the engine much can mean that some of the running. fluid could come out and fall on 2. With the parking brake applied, hot engine parts or exhaust place the shift lever in P (Park). system parts, starting a fire. Too little fluid could cause the 3. With a foot on the brake pedal, transmission to overheat. Be sure run the engine for at least to get an accurate reading if one minute and shift to D The purpose of the cold check is to checking the transmission fluid. (Drive). Then shift to determine if the transmission has N (Neutral) and then enough fluid to be operated safely R (Reverse) to fill the hydraulic until a hot check can be made. The Wait at least 30 minutes before system. Then, put the shift fluid level rises as fluid temperature checking the transmission fluid level lever in P (Park). increases. DO NOT fill above the if the vehicle has been driven: 4. Allow the engine to run at idle COLD band if the transmission fluid . When outside temperatures are (500 – 800 rpm). Slowly is below normal operating above 32 °C (90 °F). release the brake pedal. temperatures. . At high speed for quite a while. 1. Pull out the dipstick and wipe it with a clean rag or paper towel. . In heavy traffic especially in — The transmission dipstick is hot weather. near the center of the engine . While pulling a trailer. compartment. See Engine Compartment Overview 0 86 for location. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 97 2. Push it back in all the way, wait 1. Operate the transmission in D Consistency of Readings three seconds, and then pull it (Drive) until the normal Always check the fluid level at least back out again. operating temperature of 71 °C twice using the procedures 3. Check the fluid level reading. (160 °F) to 93 °C (200 °F) is described previously. Consistency is Repeat the check procedure to reached. important to maintaining proper fluid verify the reading. 2. Pull out the dipstick and wipe it level. If inconsistent readings 4. If the fluid level is within the with a clean rag or paper towel. persist, check the transmission COLD band, the transmission 3. Push it back in all the way, wait breather to be sure it is clean and may be operated until the fluid three seconds, and then pull it unclogged. If readings are still is hot enough to perform a hot back out again. Repeat the inconsistent, contact your dealer. check. If the fluid level is not check procedure to verify the What Transmission Fluid within the COLD band, add or reading. to Use drain fluid as necessary to 4. Safe operating level is within Cold Operation bring the level into the middle the HOT band on the dipstick. of the COLD band. The width of the HOT band When temperatures are very cold, 5. Perform a hot check at the first represents approximately 1.0 L the transmission will prevent certain opportunity after the normal (1.06 qt) of fluid at normal operations to protect against operating temperature of 71 °C operating temperature. damage. The information below shows shift range availability based (160 °F) to 93 °C (200 °F) is 5. If the fluid level is not within the on transmission oil temperatures: reached. HOT band, add or drain fluid as 6. If the fluid level is in the necessary to bring the fluid . All shift ranges available at acceptable range, push the level to within the HOT band. −25 °C (−13 °F) or above. dipstick back in all the way. 6. If the fluid level is in the . 2 (Second) and 3 (Third) shift Hot Check Procedure acceptable range, push the ranges only at −35 °C (−31 °F) dipstick back in all the way. to −25 °C (−13 °F). The fluid must be hot to ensure an accurate check. The fluid level rises . 2 (Second) shift range only at as temperature increases. −35 °C (−31 °F) or lower. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

98 Vehicle Care Torque converter clutch operation 2. For areas where ambient will also be prevented when air or temperatures fall below Caution transmission oil temperatures are −40 °C (−40 °F), synthetic below certain levels. transmission fluid should be Use of the incorrect automatic transmission fluid may damage Transmission shifting might be used. See Recommended Fluids and Lubricants 0 126. the vehicle, and the damage may firmer with a cold transmission. This not be covered by the vehicle difference in shift quality is normal. The synthetic transmission fluid can be used for all temperature warranty. Always use the ranges. automatic transmission fluid listed in Recommended Fluids and How to Add Fluid Lubricants 0 126. See Recommended Fluids and 0 Lubricants 126 to determine what . After adding fluid, recheck the kind of transmission fluid to use. fluid level as described under Add fluid only after checking the “How to Check” previously in this transmission fluid while it is hot. section. A cold check is used only as a . When the correct fluid level is reference. If the fluid level is low, obtained, push the dipstick back add only enough of the proper fluid in all the way. to bring the level up to the HOT area 1. For areas where ambient for a hot check. It does not take When to Check and Change temperatures stay above much fluid, generally less than 0.5 L (2.8L 4-Cylinder Engine Van −40 °C (−40 °F), regular (1 pt). Do not overfill. Models) transmission fluid can be used. It is not necessary to check the See Recommended Fluids and 0 transmission fluid level. Lubricants 126. A transmission fluid leak is the only reason for fluid loss. If a leak Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 99 occurs, take the vehicle to your When to Inspect the Engine Air dealer and have it repaired as soon Cleaner/Filter Caution as possible. For intervals on changing and Water sprayed into or on the air There is a special procedure for inspecting the engine air filter, see intake box in the engine 0 checking and changing the Maintenance Schedule 122. compartment may damage the air transmission fluid. Because this filter or electrical components. Do procedure is difficult, this should be How to Inspect the Engine Air Cleaner/Filter not spray water into or on the air done at your dealer. Contact your intake box. dealer for additional information. Do not start the engine or have the engine running with the engine air Change the fluid and filter at the filter housing open. Before removing intervals listed in Maintenance the engine air filter, make sure that Schedule 0 122, and be sure to use the engine air filter housing and the fluid listed in Recommended nearby components are free of dirt Fluids and Lubricants 0 126. and debris. Remove the engine air filter. Lightly tap and shake the Engine Air Cleaner/Filter engine air filter (away from the 2.8L 4-Cylinder Engine Pickup vehicle) to release dust and dirt. Models Inspect the engine air filter for damage, and replace if damaged. See “Engine Air Cleaner/Filter” in Do not clean the engine air filter or the owner’s manual. components with water or 6.6L 8-Cylinder Engine Pickup compressed air. When changing the air filter, remove the dust valve from Models 1. Housing Base the front intake air duct and clean 2. Screws out any debris if necessary. The air cleaner/filter assembly is on 3. Housing Cover the front corner of the engine 4. Electrical Connector compartment on the passenger side of the vehicle. See Engine 5. Clamps Compartment Overview 0 86. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

100 Vehicle Care To inspect and replace the filter: 11. Move the air duct in place and 1. Disconnect the wiring harness tighten the two clamp screws. electrical connector (4) from 12. Reinstall the wiring harness the air cleaner/filter housing electrical connector. cover (3). See Maintenance Schedule 0 122 to 2. Loosen the screws on the determine when to replace the clamps (5) holding the air outlet engine air cleaner/filter. duct in place. Do not remove the clamps. Move the air duct { Warning aside. 3. Remove the two screws (2) Operating the engine with the air cleaner/filter off can cause you or from the housing cover. 6. Turn the dust valve others to be burned. The air counterclockwise to remove 4. Raise the housing cover. Take cleaner not only cleans the air; it from the front intake air duct. care not to move the air helps to stop flames if the engine cleaner/filter housing base (1), Check it for debris and clean backfires. Use caution when to avoid any air leaks. out if necessary. working on the engine and do not 5. Remove the air cleaner/filter 7. Turn the dust valve clockwise drive with the air cleaner/filter off. from the housing base. Take to reinstall. care to dislodge as little dirt as 8. Clean the air cleaner/filter possible. sealing surface and the housing base. Caution 9. Install the engine air cleaner/ If the air cleaner/filter is off, dirt filter. can easily get into the engine, 10. Lower the air cleaner/filter which could damage it. Always housing cover and secure with have the air cleaner/filter in place the two screws. when driving. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 101 2.8L 4-Cylinder Engine Van Do not clean the engine air filter or 2. Unlock the two retaining Models components with water or clips (2) on the sides of the compressed air. housing cover (4) and on the The air cleaner/filter assembly is on housing base and pull the the front of the engine compartment cover off. on the driver side of the vehicle. See Engine Compartment Overview 3. Remove the air cleaner/filter 0 86. from the housing base. Take care to dislodge as little dirt as When to Inspect the Engine Air possible. Cleaner/Filter 4. Clean the air cleaner/filter For intervals on changing and sealing surface and inspecting the engine air filter, see housing base. Maintenance Schedule 0 122. 5. Install the engine air cleaner/ How to Inspect the Engine Air filter by aligning the arrow on Cleaner/Filter one side of the air cleaner/filter end cap with the arrow on top Do not start the engine or have the 1. Screws of the housing base. engine running with the engine air 2. Retaining Clips filter housing open. Before removing 3. Housing Base 6. Reinstall the housing cover by the engine air filter, make sure that 4. Housing Cover aligning the arrow on top of the the engine air filter housing and 5. Turbo Air Duct cover to the arrow on top of the nearby components are free of dirt housing base, and fasten the and debris. Remove the engine air To inspect and replace the filter: two retaining clips. filter. Lightly tap and shake the 1. Remove the two screws (1) engine air filter (away from the 7. Align the two bushings under and lift the air cleaner/filter the housing base to the guide vehicle) to release dust and dirt. housing base (3) to clear the pins below on the closure Inspect the engine air filter for turbo air duct (5). damage, and replace if damaged. assembly and push the housing base into place. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

102 Vehicle Care 8. Reinstall the two screws to Cooling System 3. Engine Cooling Fan (Out secure the housing base. of View) The cooling system allows the 0 See Maintenance Schedule 122 to engine to maintain the correct 2.8L 4-Cylinder Engine Van determine when to replace the working temperature. Models engine air cleaner/filter. 2.8L 4-Cylinder Engine Pickup { Warning Models See “Cooling System” in the Operating the engine with the air owner’s manual. cleaner/filter off can cause you or others to be burned. The air 6.6L 8-Cylinder Engine Pickup cleaner not only cleans the air; it Models helps to stop flames if the engine backfires. Use caution when working on the engine and do not drive with the air cleaner/filter off.

1. Coolant Surge Tank Caution 2. Coolant Surge Tank Pressure Cap If the air cleaner/filter is off, dirt 3. Engine Cooling Fan (Out can easily get into the engine, of View) which could damage it. Always have the air cleaner/filter in place when driving. 1. Coolant Surge Tank 2. Coolant Surge Tank Pressure Cap Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 103 See Recommended Fluids and What to Use { Warning Lubricants 0 126 and Maintenance Schedule 0 122. An underhood electric fan can { Warning The following explains the cooling start up even when the engine is Plain water, or other liquids such not running and can cause injury. system and how to add coolant when it is low. If there is a problem as alcohol, can boil before the Keep hands, clothing, and tools proper coolant mixture will. With away from any underhood with engine overheating, see Engine Overheating 0 106. plain water or the wrong mixture, electric fan. the engine could get too hot but A 50/50 mixture of clean, drinkable there would not be an overheat water and DEX-COOL coolant will: warning. The engine could catch { Warning . Give freezing protection down to fire and you or others could be −37 °C (−34 °F). burned. Do not touch heater or radiator . Give boiling protection up to hoses, or other engine parts. 129 °C (265 °F). Use a 50/50 mixture of clean, They can be very hot and can . Protect against rust and drinkable water and DEX-COOL burn you. Do not run the engine if corrosion. coolant which will not damage there is a leak; all coolant could aluminum parts. If using this leak out. That could cause an . Help keep the proper engine mixture, nothing else needs to be engine fire and can burn you. Fix temperature. added. any leak before driving the . Let the warning lights and vehicle. If coolant has to be added more gauges work as they should. than four times a year, have your dealer check the vehicle cooling Engine Coolant system. The cooling system in the vehicle is filled with DEX-COOL engine coolant mixture. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

104 Vehicle Care Checking Coolant (6.6L 8-Cylinder Checking Coolant (2.8L 4-Cylinder Caution Engine Pickup Models) Engine Van Models) Do not use anything other than a mix of DEX-COOL coolant that meets GM Standard GMW3420 and clean, drinkable water. Anything else can cause damage to the engine cooling system and the vehicle, which would not be covered by the vehicle warranty.

Never dispose of engine coolant by putting it in the trash, or by pouring it on the ground or into sewers, The coolant surge tank is in the The coolant surge tank is near the streams, or bodies of water. Have engine compartment on the center of the engine compartment. the coolant changed by an passenger side of the vehicle. See See Engine Compartment Overview authorized service center, familiar Engine Compartment Overview 0 86 0 86 for location. with legal requirements regarding for location. The vehicle must be on a level used coolant disposal. This will help The coolant surge tank is divided surface. When the engine is cold, protect the environment and your into two sides. The upper should be the coolant level should be at the health. filled to the indicated mark. The indicated mark. lower portion will be mostly empty, Checking Coolant (2.8L 4-Cylinder Adding Coolant (2.8L 4-Cylinder Engine Pickup Models) depending on the operating temperature. Engine Pickup Models) See “Engine Coolant” in the owner’s See “Engine Coolant” in the owner’s manual. manual. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 105 Adding Coolant (2.8L 4-Cylinder surge tank pressure cap and Engine Van and 6.6L 8-Cylinder { Warning upper radiator hose, is no Engine Pickup Models) longer hot. Steam and scalding liquids from a hot cooling system are under For 8-cylinder pickups, turn the Caution pressure. Turning the pressure pressure cap slowly clockwise cap, even a little, can cause them about one-half turn. If a hiss is If coolant is changed or added, heard, wait for that to stop. always add enough to fill the to come out at high speed and you could be burned. Never turn A hiss means there is still system completely or engine some pressure left. damage may occur. the cap when the cooling system, including the pressure cap, is hot. For vans, turn the pressure cap Wait for the cooling system and slowly counterclockwise about If more coolant is needed, add the pressure cap to cool. one full turn. If a hiss is heard, proper DEX-COOL coolant mixture wait for that to stop. A hiss at the surge tank, but be careful not means there is still some to spill it. If no coolant is visible in the surge pressure left. tank, add coolant as follows: 2. Keep turning the pressure cap { Warning slowly, and remove it. Spilling coolant on hot engine 3. Slowly fill the coolant surge parts can burn you. Coolant tank. Do not let the coolant contains ethylene glycol and it will level go above the indicated burn if the engine parts are hot mark in the tank until after the enough. 6.6L 8-Cylinder 2.8L 4-Cylinder engine comes to operating Pickup Van temperature in Step 4. Pressure Cap Pressure Cap 4. With the coolant surge tank pressure cap off, start the 1. Remove the coolant surge tank engine and let it run until the pressure cap when the cooling system, including the coolant Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

106 Vehicle Care engine coolant temperature gauge indicates approximately Caution Warning (Continued) 90 °C (195 °F). If the pressure cap is not tightly including the pressure cap, is hot. By this time, the coolant level installed, coolant loss and engine Wait for the cooling system and inside the coolant surge tank damage may occur. Be sure the pressure cap to cool. may be lower. If the level is cap is properly and tightly lower, slowly add more of the secured. proper mixture to the coolant surge tank until it reaches the Caution indicated mark. Engine Overheating Do not run the engine if there is a 5. Replace the pressure cap. There is an engine coolant leak in the engine cooling system. For 8-cylinder pickups, be sure temperature gauge on the This can cause a loss of all the pressure cap is locked. instrument cluster. See the owner’s coolant and can damage the manual. For vans, be sure the pressure system and vehicle. Have any cap is hand-tight and fully If Steam Is Coming from the leaks fixed right away. seated. Engine Compartment 6. Verify coolant level after the If No Steam Is Coming from engine is shut off and the { Warning the Engine Compartment coolant is cold. If necessary, repeat coolant fill procedure Steam and scalding liquids from a A Driver Information Center (DIC) message, along with a low coolant Steps 1–6. hot cooling system are under pressure. Turning the pressure condition, can indicate a serious If the coolant level is still low after cap, even a little, can cause them problem. having followed these steps twice, have the coolant system checked by to come out at high speed and If there is an engine overheat warning and the vehicle does not a certified technician at the dealer you could be burned. Never turn have a low coolant condition, and for a possible leak. the cap when the cooling system, (Continued) no steam is heard or seen, the Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 107 problem may not be too serious. If the vehicle no longer has the 8-Cylinder Pickup Only Sometimes the engine can get a overheat warning, the vehicle can If the Action Required - Idle Vehicle little too hot when the vehicle: be driven. Just to be safe, drive To Cool Engine DIC message 8- slower for about 10 minutes. If the displays, do not turn the engine off. warning does not come back on, . Climbs a long hill on a hot day. Keep the engine running until the drive normally and have the cooling message goes away. . Stops after high-speed driving. system checked for proper fill and function. . Idles for long periods in traffic. Battery (4-Cylinder If the warning continues, pull over, Pickup Only) . Tows a trailer. See “Driving on stop, and park the vehicle Grades” under “Driving right away. Pickups with a 4-cylinder diesel Characteristics and Towing Tips” engine are equipped with an AGM If there is still no sign of steam and in the owner’s manual. (Absorbing Glass Mat) 12-volt the vehicle is equipped with an battery. Installation of a standard If the DIC message comes on with engine driven cooling fan, push 12-volt battery will result in reduced no sign of steam, try this for a down the accelerator until the cold cranking performance. When minute or so: engine speed is about twice as fast using a battery charger on the AGM as normal idle speed for at least 1. In heavy traffic, let the engine battery, use the AGM setting on the five minutes while the vehicle is idle in N (Neutral) while charger, if available, to limit charge parked. If the warning is still there, stopped. If it is safe to do so, voltage to 14.8 volts. Follow the turn off the engine and get everyone pull off the road, shift to charger manufacturer's instructions. P (Park) or N (Neutral), and let out of the vehicle until it cools down. See “Battery - North America” in the the engine idle. owner’s manual. 2. Turn on the heater to full hot at the highest fan speed and open the window as necessary. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

108 Vehicle Care

Electrical System Caution { Danger Engine Compartment Spilling liquid on any electrical Fuses and circuit breakers are Fuse Block component on the vehicle may marked with their ampere rating. damage it. Always keep the Do not exceed the For additional fuse and electrical covers on any electrical specified amperage rating when information, see “Electrical System” component. replacing fuses and circuit in the owner’s manual. breakers. Use of an oversized The engine compartment fuse block A fuse puller is available inside this fuse or circuit breaker can result is in the engine compartment, on fuse block. in a vehicle fire. You and others the driver side of the vehicle. could be seriously injured or killed.

Lift the cover to access the fuse block. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 109 4-Cylinder Pickup Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

110 Vehicle Care

The vehicle may not be equipped Fuses Usage Fuses Usage with all of the fuses, relays, and features shown. F10 Engine control F26 Antilock brake module-injectors system pump Fuses Usage F11 Mass air flow F27 Trailer brake F1 Traction control sensor control module module power F12 Starter F28 Rear window F2 Engine control defogger module power F13 Traction control module F29 F3 Air conditioning – clutch F14 – F30 Driver heated seat F4 NOx sensors/ F15 – F31 – Exhaust particulate F16 – F32 passenger sensors F17 Front axle actuator heated seat F5 Engine control F33 Body control F18 – module/Integrated module 3 chassis control F19 – module/Water in F34 Integrated chassis fuel sensor F20 Fuel pump control module F6 Front wipers F21 Front blower F35 – F7 Cargo lamp F22 Antilock brake F36 Center system valves high-mounted F8 Engine control stoplamp module F23 – miscellaneous F24 Trailer F37 Right high-beam headlamp F9 Engine control F25 Transfer case module electronic control F38 Left high-beam headlamp Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 111

Fuses Usage Fuses Usage Fuses Usage F39 Rear differential F52 – F68 – lock actuators F53 – F69 Battery regulated F40 Front differential voltage control F54 – lock actuators F70 F55 – – F41 Glow plug module F56 Washer pump F71 – F42 – F72 F57 – – F43 – F73 F58 – – F44 Fuel heater F74 Generator F59 – F45 Selective catalytic F75 – reduction power F60 Mirror defogger module heater F61 – Relays Usage F46 Cooling fan clutch F62 Selective catalytic K1 Air conditioning F47 Heater crankcase reduction power clutch ventilation module K2 Starter F48 Fog lamps (if F63 – K3 Powertrain sensor equipped) F64 Trailer reverse F49 Selective catalytic lamps K4 Wiper speed reduction power F65 Left trailer K5 Wiper control module wake up stoplamp/Turnlamp K6 Cargo lamp F50 Trailer parking F66 Right trailer K7 Powertrain lamps stoplamp/Turnlamp K8 Fuel pump F51 Horn F67 Electric power steering Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

112 Vehicle Care

Relays Usage K9 Front differential lock actuators K10 Rear differential lock actuators K11 Center high-mounted stoplamp K12 Fuel heater K13 Selective catalytic reduction power module heater control K14 Trailer parking lamps K15 Run/Crank K16 Cooling fan clutch K17 Rear window defogger/Mirror defogger Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 113 4-Cylinder Van Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

114 Vehicle Care

The vehicle may not be equipped Fuses Usage Fuses Usage with all of the fuses, relays, and features shown. 13 Display/Mirrors/ 27 Special equipment Rear vision camera option Fuses Usage 14 Washer 28 Airbag 1 Antilock brake system motor 16 Horn 29 Steering wheel sensor 2 Antilock brake 17 Transmission system module 18 Air conditioning 30 Engine control module/Glow plug 3 Right trailer 19 Engine control module/Ignition stoplamp/Turnlamp module battery 31 Transmission 4 – 20 Cutaway/Left control module/ 5 – stoplamp/Turnlamp Ignition 6 Fuel system control 21 Left trailer 32 Transmission module/Ignition stoplamp/Turnlamp control module 7 Body control 22 Cutaway/Right battery module 5 stoplamp/Turnlamp 33 Obstacle detection 8 Body control 23 NOx sensors 34 NOx sensors module 7 24 Gas fuel pump/ 35 Fuel operated 9 Body control Diesel fuel pump heater module module 4 25 Auxiliary power 36 Fuel system control 10 Instrument cluster outlet module battery 11 Trailer wiring 26 Body control 37 – module 3 12 – Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 115

Fuses Usage Fuses Usage Fuses Usage 41 T87A Transmission 58 Body control 71 Fuel heater/Flex control module module 2 fuel sensor battery 59 Body control 72 Body control 42 Trailer wiring module 1 module 6 43 EV fan clutch 61 Crankcase vent 73 Lighter/Data link 44 Starter solenoid heater connector 45 Engine control 62 O2 sensor 2/EV fan 74 Front blower module/Powertrain 63 – 75 Fuel Injectors 46 AC DC inverter 64 Mass airflow 76 Soot sensor sensor/Canister 47 Cooling fan–low 77 O2 sensor 1/ vent/Humidity Cluster 50 – sensor 51 Left high-beam 78 Engine control 65 Ignition/ module/Powertrain headlamp Injectors–odd 79 Ignition/ 52 RIght high-beam 66 Daytime running Injectors–even headlamp lamps 2 53 Left low-beam 67 Daytime running Relays Usage headamp lamps 1–uplevel 15 Run/Crank 54 Right low-beam 68 Auxiliary stoplamps headlamp 37 NOx sensors 69 Trailer power 55 Wipers extension 38 Fuel pump 56 Canister vent 70 Upfitter stoplamps 39 Crank solenoid 40 Air conditioning Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

116 Vehicle Care

Relays Usage Auxiliary Fuse Block Relays Usage 48 EV fan clutch MR Rel 1 Fuel filter heater 49 Powertrain MR Rel 2 Diesel exhaust fluid power/Wake up 57 Cooling fan–low 60 Cooling fan control Mega Fuse Holder K3 Wipers–high To check the fuse release the yellow K5 Horn/Washer clamps on both sides and pull off the cover. K6 Low-beam headlamps K7 High-beam headlamps The vehicle may not be equipped K9 Left trailer with all of the fuses, relays, and stoplamp/Turnlamp features shown. K11 Stoplamps Fuses Usage K13 Wipers MR-1 Fuel filter heater K18 Right trailer MR-2 Diesel exhaust fluid stoplamp/Turnlamp power K19 Daytime running MR-3 Diesel exhaust fluid lamps wake up Fuse Usage 1 Starter motor Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 117

8-Cylinder Pickup Fuses Usage 2 Trailer battery 3 Antilock brake system pump 4 Instrument panel BEC 1 5 Passenger motorized seat belt 6 4WD transfer case electronic control 7 Electric parking brake 8 Instrument panel BEC 2 9 Driver motorized seat belt 10 Rear window defogger 11 Starter 12 Cooling fan 1 13 Cooling fan 2 14 Left trailer stop/ The vehicle may not be equipped Fuses Usage with all of the fuses, relays, and Turn lamps features shown. 1 Trailer brake Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

118 Vehicle Care

Fuses Usage Fuses Usage Fuses Usage 15 Trailer parking 28 Right parking 43 Engine lamps lamps 44 Fuel injectors 16 Trailer reverse 29 Left parking lamps A–odd lamps 30 Upfitter 3 45 Fuel injectors 17 Right trailer stop/ 31 Upfitter 4 B–even Turn lamps 32 Upfitter 4 46 Afterboil 18 Fuel pump 33 Reverse lamps 47 Throttle control 19 Integrated chassis 48 Horn control module 34 Engine control module/Ignition 49 Fog lamps 20 Electronic suspension control/ 35 Air conditioning 50 O2 Sensor A Electronic level clutch 51 Engine control control/Exhaust 36 Heated mirrors module 21 Fuel pump power 37 Upfitter 1 52 Interior heater module 38 Center 53 Police upfitter 22 Upfitter 1 high-mounted 54 Front washer 23 Upfitter 2 stoplamp 55 Air conditioning 24 Front wiper 39 Miscellaneous/ compressor Ignition 25 Antilock brake module system valves 40 Transmission/ 56 Selective catalytic Ignition 26 Upfitter 2 reduction power 41 Fuel pump 2 module/SEN ENB 27 Upfitter 3 42 Cooling fan clutch Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Vehicle Care 119 Fuses Usage Relays Usage Appearance Care 57 Transmission 63 Trailer parking control module/ lamps Exterior Care Engine control 64 Run/Crank See the owner’s manual for module additional exterior care information. 65 Upfitter 1 58 Headlamps 66 Fuel pump 2 74 Electric running Caution boards (if 67 Air conditioning equipped) control Water sprayed into or on the air intake box in the engine 80 Leveling/Exhaust 68 Starter compartment may damage the air solenoid 69 Rear window filter or electrical components. Do 81 Diesel exhaust fluid defogger not spray water into or on the air heater 70 Engine control intake box. 82 Fuel heater module 84 Trailer interface 71 Cooling fan clutch module 72 CKT 95 85 Fuel heater 73 CKT 92 86 EURO trailer R/C 75 Fuel heater 78 Diesel exhaust fluid Relays Usage heater 59 Fuel pump 79 PT sensor 60 Upfitter 2 61 Upfitter 3 62 Upfitter 4 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

120 Service and Maintenance 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 ...... 120 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 ...... 122 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 ...... 126 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 ...... 127 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 ...... 129 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 Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Service and Maintenance 121 . 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 45. 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 Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

122 Service and Maintenance Maintenance Engine Oil Change Required Services Every Schedule When the CHANGE ENGINE OIL 12 000 km/7,500 mi SOON message displays, have the . Check engine oil level and oil Owner Checks and Services engine oil and filter changed within life percentage. If needed, the next 1 000 km/600 mi. If driven change engine oil and filter, and See the owner s manual for other ’ under the best conditions, the reset oil life system. See Engine services and intervals that may be engine oil life system may not Oil 0 91 and Engine Oil Life required. indicate the need for vehicle service System 0 95. for up to a year. The engine oil and At Each Fuel Stop . Check engine coolant level. See filter must be changed at least once . Check the engine oil level. See Cooling System 0 102. 0 a year and the oil life system must Engine Oil 91. be reset. Your trained dealer . Visually check for fluid leaks. technician can perform this work. . Inspect engine air cleaner filter. If the engine oil life system is reset See Engine Air Cleaner/Filter accidentally, service the vehicle 0 99. within 5 000 km/3,000 mi since the last service. Reset the oil life . Visually inspect fuel system for system when the oil is changed. damage or leaks. See Engine Oil Life System 0 95. . Visually inspect exhaust system and nearby heat shields for loose or damaged parts. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Service and Maintenance 123

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. Replace engine air cleaner filter. (1) @ @ @ Change automatic transmission fluid and filter. @ (HD 6-Speed Allison Transmission Only) Change automatic transmission external filter. @ @ (2500/3500 Pickup Only). Drain and fill engine cooling system. (2) @ Visually inspect accessory drive belts. (3) @ Replace timing belt. (2.8L 4-Cylinder Engine) @ Replace fuel filter. (8-Cylinder Pickup) (4) @ @ @ @ @ @ Replace fuel filter. (4-Cylinder Pickup) (4) @ @ @ @ Replace fuel filter. (Van) (4) @ @ @ @ @ Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

124 Service and Maintenance 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 0 102. the Driver Information Center (DIC) (1) Or every four years, whichever (3) Or every 10 years, whichever comes on, whichever comes first. comes first. If driving in dusty comes first. Inspect for fraying, The fuel filter may need to be conditions, inspect the filter at each excessive cracking, or damage; replaced more often based on oil change or more often as needed. replace, if needed. biodiesel usage, driving in climates with severe dust, off-road driving, or towing a trailer for extended periods. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Service and Maintenance 125

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. 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 timing belt. (2.8L 4-Cylinder Engine) @ Replace fuel filter. (8-Cylinder Pickup) (4) @ @ @ @ @ @ Replace fuel filter. (4-Cylinder Pickup) (4) @ @ @ @ Replace fuel filter. (Van) (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 0 102. the Driver Information Center (DIC) (1) Or every four years, whichever (3) Or every 10 years, whichever comes on, whichever comes first. comes first. If driving in dusty comes first. Inspect for fraying, The fuel filter may need to be conditions, inspect the filter at each excessive cracking, or damage; replaced more often based on oil change or more often as needed. replace, if needed. biodiesel usage, when driving in climates with excessive dust, or when off-road driving or towing a trailer for extended periods. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

126 Service and Maintenance Recommended Fluids, Lubricants, and Parts Recommended Fluids and Lubricants The following fluids apply to vehicles with a Duramax diesel engine and/or an Allison Transmission. 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 (Pickup) DEXRON-VI Automatic Transmission Fluid. Allison Transmission Only: For areas where ambient temperatures are below −40 °C (−40 °F) use Synthetic Transmission Fluid approved to Allison Transmission specification TES-295 (GM Part No. 12378515, in Canada 88900701). Automatic Transmission (Van) DEXRON-HP Automatic Transmission Fluid (GM Part No. 19331925, in Canada 19300537). Diesel Exhaust Aftertreatment Diesel Exhaust Fluid (GM Part No. 19286291, in Canada 88865751) or System Diesel Exhaust Fluid that meets ISO 22241-1 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 0 102. Engine Oil (2.8L 4-Cylinder Engine) Engine oil meeting the dexos2 specification of the proper SAE viscosity grade. ACDelco dexos2 is recommended. See Engine Oil 0 91. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Service and Maintenance 127

Usage Fluid/Lubricant Engine Oil (6.6L 8-Cylinder Engine) 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 91. Hydraulic Power Steering System (If GM Power Steering Fluid (GM Part No. 19329450, in Canada 89021186). Equipped)

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 4-Cylinder Pickup (LWN) 23248945 A3216C 8-Cylinder Pickup (L5P) 84262965 A3231C 4-Cylinder Van (LWN) 84000015 A3221C Fuel Filter 4-Cylinder Pickup (LWN) 52100212 TP1007 8-Cylinder Pickup (L5P) 23304096 TP1015 4-Cylinder Van (LWN) 84186990 TP1016 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

128 Service and Maintenance

Part GM Part Number ACDelco Part Number Engine Oil Filter 4-Cylinder Engines (Van) 12677407 PF2267G 4-Cylinder Engines (Truck) 12679114 PF2262G 8-Cylinder Engines 88917036 PF2232 Use only the specified filters. Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Service and Maintenance 129 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 Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

130 Technical Data Technical Data

Vehicle Data Capacities and Specifications ...... 131 Engine Drive Belt Routing . . . . 133 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Technical Data 131 Vehicle Data Capacities and Specifications The following approximate capacities are given in metric and English conversions. See Recommended Fluids and Lubricants 0 126. Capacities Application Metric English Cooling System (Pickup Models) 2.8L 4-Cylinder Engine (LWN) 10.5 L 11.1 qt 6.6L 8-Cylinder Engine (L5P) 29.7 L 31.4 qt Cooling System (2.8L 4-Cylinder Van Models) Front Heater Core without Fuel Operated Heater (FOH) 13.7 L 14.4 qt Front Heater Core with Fuel Operated Heater (FOH) 13.9 L 14.7 qt Front and Rear Heater Core without Fuel Operated 15.8 L 16.7 qt Heater (FOH) Front and Rear Heater Core with Fuel Operated 16.0 L 16.9 qt Heater (FOH) Diesel Exhaust Fluid (DEF) Tank* 2.8L 4-Cylinder Pickup Models (LWN) 20.4 L 5.4 gal 6.6L 8-Cylinder Pickup Models (L5P) 26.5 L 7.0 gal Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

132 Technical Data

Capacities Application Metric English 2.8L 4-Cylinder Van Models (LWN) 21.0 L 5.5 gal Engine Oil with Filter 2.8L 4-Cylinder Engines 5.7 L 6.0 qt 6.6L 8-Cylinder Engines 9.5 L 10.0 qt Transmission Fluid (Pan Removal and Filter Replacement) 2.8L 4-Cylinder Engines 6.3 L 6.7 qt 6.6L 8-Cylinder Engines 7.0 L 7.4 qt *Do not overfill the DEF tank. See Diesel Exhaust Fluid 0 37. All quantities are approximate. When adding, be sure to fill to the appropriate level, as recommended in this manual. Recheck fluid level after filling.

Engine Specifications Engine VIN Code Type 2.8L 4-Cylinder Turbo Diesel (LWN Engine) 1 L4 6.6L 8-Cylinder Turbo Diesel (L5P Engine) Y V8 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Technical Data 133 Engine Drive Belt Routing

6.6L 8-Cylinder Engine (L5P Single Generator) 2.8L 4-Cylinder Engine (Pickup)

6.6L 8-Cylinder Engine (L5P Dual 2.8L 4-Cylinder Engine (Van) Generator) Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

134 Index Index A D Accessories and Modifications . . . 84 Diesel Air Cleaner/Filter, Engine ...... 99 Starting Your Engine ...... 24 Appearance Care Diesel Exhaust Fluid ...... 7, 37 Exterior ...... 119 Diesel Exhaust Fluid (DEF) Automatic Warning Light ...... 20 Transmission Fluid ...... 95 Diesel Particulate Filter ...... 34 B Drive Belt Routing, Engine ...... 133 Driver Information Battery ...... 107 Center (DIC) ...... 21 Biodiesel ...... 47 Brake E Exhaust ...... 44 Electrical System C Engine Compartment Fuse Block ...... 108 Canadian Vehicle Owners ...... 2 Engine Capacities and Air Cleaner/Filter ...... 99 Specifications ...... 131 Check Light (Malfunction Check Indicator) ...... 18 Engine Light (Malfunction Compartment Overview ...... 86 Indicator) ...... 18 Cooling System ...... 102 Cleaning Drive Belt Routing ...... 133 Exterior Care ...... 119 Heater ...... 31 Cluster, Instrument ...... 10 Oil Life System ...... 95 Cold Weather Operation ...... 49 Oil Pressure Gauge ...... 17 Cooling System ...... 102 Overheating ...... 106 Covers Starting Your Diesel ...... 24 Winter ...... 27 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

Index 135 Engines Fuses M Diesel Fuel ...... 45 Engine Compartment Fuse Maintenance Exhaust Brake ...... 44 Block ...... 108 Records ...... 129 Exhaust Fluid G Maintenance Schedule ...... 122 Diesel ...... 37 Gauges Recommended Fluids and F Engine Oil Pressure ...... 17 Lubricants ...... 126 Filter ...... 34 Fuel ...... 16 Malfunction Indicator Lamp ...... 18 Replacement (Fuel) ...... 54 General Information O Filter, Service and Maintenance . . . . . 120 Oil Engine Air Cleaner ...... 99 H Engine ...... 91 Fluid Heater Engine Oil Life System ...... 95 Automatic Transmission ...... 95 Engine ...... 31 Engine Oil Pressure Gauge . . . . .17 Diesel Exhaust ...... 7 Fuel Operated ...... 33 Overheating, Engine ...... 106 Fuel P Biodiesel ...... 47 I Parking Cold Weather Operation ...... 49 Instrument Cluster ...... 10 Over Things That Burn ...... 34 Diesel Engines ...... 45 Introduction ...... 2 Personalization Filling a Portable Fuel L Vehicle ...... 22, 23 Container ...... 58 Lamps Power Take-Off (PTO) ...... 66 Filling the Tank ...... 56 Malfunction Indicator (Check Power Take-Off Light ...... 21 Filter Replacement ...... 54 Engine) ...... 18 Gauge ...... 16 Lights R Operated Heater (FOH) ...... 33 Check Engine (Malfunction Recommended Fluids and Running out of Fuel ...... 53 Indicator) ...... 18 Lubricants ...... 126 Water in Fuel ...... 50 Diesel Exhaust Fluid (DEF) . . . . .20 Records What to Use in the U.S...... 46 Power Take-off ...... 21 Maintenance ...... 129 Fuel for Diesel Engines ...... 45 Wait to Start ...... 20 Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada- 11354421) - 2018 - CRC - 10/10/17

136 Index Replacement Parts V Maintenance ...... 127 Vehicle Routing, Engine Drive Belt ...... 133 Canadian Owners ...... 2 Running out of Fuel ...... 53 Personalization ...... 22, 23 S W Service Wait to Start Light ...... 20 Accessories and Water in Fuel ...... 50 Modifications ...... 84 What Fuel to Use in Canada . . . . . 47 Maintenance Records ...... 129 What Fuel to Use in the U.S. . . . . 46 Maintenance, General Winter Cover ...... 27 Information ...... 120 Specifications and Capacities ...... 131 Starting the Diesel Engine ...... 24 Supplement Using ...... 3 T Towing Trailer ...... 58 Trailer Towing ...... 58 Transmission Fluid, Automatic ...... 95 U Using This Supplement ...... 3 18_MUL_Duramax_Diesel_Supplement_COV_en_US_23380346C_2018MAR29.ai 1 3/22/2018 12:50:21 PM

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