2012 CHEVY / CHEVROLET Duramax Diesel Supplement Owners Manual

2012 DURAMAX Diesel Engine (LML/LGH) M In Brief ........................ 1-1 Initial Drive Information ........ 1-1 Performance and Maintenance ................. 1-2 Instruments and Controls .... 5-1 Warning Lights, Gauges, and Indicators .................... 5-2 Information Displays ........... 5-9 Vehicle Messages ............ 5-10 Vehicle Personalization ....... 5-15 Driving and Operating ........ 9-1 Starting and Operating ......... 9-2 Diesel Particulate Filter ....... 9-12 Diesel Exhaust Fluid ......... 9-14 Brakes ....................... 9-20 Fuel .......................... 9-21 Towing ....................... 9-42 Conversions and Add-Ons . . . 9-48 Vehicle Care ................. 10-1 General Information .......... 10-1 Vehicle Checks ............... 10-4 Electrical System ............ 10-31 Service and Maintenance ... 11-1 General Information .......... 11-1 Maintenance Schedule ....... 11-4 Special Application Services .................... 11-9 Additional Maintenance and Care ................... 11-10 Recommended Fluids, Lubricants, and Parts ...... 11-13 Maintenance Records ....... 11-17 Technical Data ............... 12-1 Vehicle Data .................. 12-2 Index ..................... i-1

ii Introduction The names, logos, emblems, slogans, vehicle model names, and vehicle body designs appearing in this manual including, but not limited to, GM, the GM logo, CHEVROLET, GMC, the CHEVROLET and GMC Truck Emblems, SILVERADO, SIERRA, DENALI, EXPRESS, SAVANA, and Duramax are trademarks and/or service marks of General Motors LLC, its subsidiaries, affiliates, or licensors. This manual describes features that may or may not be on your specific vehicle either because they are options that you did not purchase or due to changes subsequent to the printing of this owner manual. Please refer to the purchase documentation relating to your specific vehicle to confirm each of the features found on your vehicle. For vehicles first sold in Canada, substitute the name “General Motors of Canada Limited” for GMC and Chevrolet Motor Division wherever it appears in this manual. This manual contains information that pertains to the operation of your diesel engine. It also contains your Diesel Maintenance Schedule. The sections in this manual correspond to the sections in your owner manual. This manual, along with your owner manual, will assist you in the proper use and maintenance of your vehicle. Keep this manual in the vehicle for quick reference. Canadian Vehicle Owners Propriétaires Canadiens A French language copy of this manual can be obtained from your dealer or from: On peut obtenir un exemplaire de ce guide en français auprès du concessionnaire ou à l'adresse suivante: Helm, Incorporated P.O. Box 07130 Detroit, MI 48207 1-800-551-4123 Numéro de poste 6438 de langue française www.helminc.com Litho in U.S.A. Part No. 20875612 A First Printing © 2011 General Motors LLC. All Rights Reserved.

Introduction iii 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 manual to learn about the vehicle's features and controls. Index A good place to look for what you need is the Index in back of this supplement. It is an alphabetical list of what is in the supplement, and the page number where you will find it.

iv Introduction 2 NOTES

In Brief 1-1 In Brief Initial Drive Information Transmission .................. 1-1 Performance and Maintenance Engine Oil Life System ........ 1-2 Diesel Particulate Filter ....... 1-3 Diesel Exhaust Fluid .......... 1-5 Initial Drive Information Transmission Cold Operation When temperatures are very cold, the transmission will prevent certain operations to protect against damage. The chart below shows shift range availability based on transmission oil temperature: . All shift ranges available at −25 C (−13 F) or above. . 2 (Second) and 3 (Third) shift ranges only at −35 C (−31 F) to −25 C (−13 F). . 2 (Second) shift range only at −35 C (−31 F) or lower. Torque converter clutch operation will also be prevented when air or transmission oil temperatures are below certain levels. For areas where ambient temperatures are below −40 C (−40 F), use synthetic transmission fluid approved to Allison Transmission specification TES‐295. See Recommended Fluids and Lubricants on page 11‑13 and Automatic Transmission Fluid on page 10‑12. Adaptive Shift Controls The shift quality of a new vehicle may not be ideal because the Adaptive Shift Control process may not have determined the best settings for a particular shift or condition. Shift quality will improve with continued driving.

1-2 In Brief Low Traction Mode Low Traction Mode aids in vehicle acceleration on slippery road surfaces such as ice or snow. By selecting 2 (Second) using Range Selection Mode while at a stop, the transmission will limit torque to the drive wheels to prevent slippage. Heater Performance Mode When cold weather conditions are detected, the transmission raises part throttle upshift points after the 1 (First) to 2 (Second) upshift to increase engine speed. This feature shortens engine and cab warm up times. When the transmission is in this mode, upshifts may be delayed. This is normal and does not indicate an operational problem. Four Wheel Drive When operating in 4 ↓ (Four-Wheel-Drive Low), there is a very deep gear reduction. The resulting shifts will feel exaggerated. Performance and Maintenance Engine Oil Life System The engine oil life system calculates engine oil life based on vehicle use and, on most vehicles, displays a DIC message when it is necessary to change the engine oil and filter. The oil life system should be reset only following an oil change. Resetting the Oil Life System To reset the Engine Oil Life System on van models: 1. Display the OIL LIFE REMAINING on the DIC. 2. Press and hold the SET/RESET button on the DIC for more than five seconds. The oil life will change to 100%.

In Brief 1-3 To reset the Engine Oil Life System on most pickup models: 1. Display the OIL LIFE REMAINING on the DIC. If the vehicle does not have DIC buttons, the vehicle must be in P (Park) to access this display. 2. Press and hold the SET/RESET button on the DIC, or the trip odometer reset stem if the vehicle does not have DIC buttons, for more than five seconds. The oil life will change to 100%. On all models, the Engine Oil Life System can be reset as follows: 1. Turn the ignition to ON/RUN with the engine off 2. Fully press the accelerator pedal slowly three times within five seconds. 3. Display the OIL LIFE REMAINING on the DIC. If the display shows 100%, the system is reset. 4. Turn the key to LOCK/OFF. See Engine Oil Life System on page 10‑10. Diesel Particulate Filter The Duramax engine is equipped with a Diesel Particulate Filter (DPF) that, by design, will filter or trap particulates. The DPF is located under the vehicle in the exhaust system. Depending on a number of factors monitored by the engine computer, the DPF will need to be cleaned of accumulated solids. When a cleaning is needed, the engine computer will initiate a cleaning action by warming the exhaust gas temperature. This feature has been designed to operate automatically, with limited operator involvement or awareness. Cleaning the DPF (Exhaust Filter) While the DPF cleaning is automatically controlled by the engine computer, the vehicle will need to operate continuously for approximately 30 minutes and at speeds greater than 48 km/h (30 mph) to clean the DPF effectively. If the vehicle is returned to idle during the cleaning process, the driver may notice a slightly different sound or a slightly elevated engine idle speed. This is normal. No action is required on the part of the driver during a regular DPF cleaning. See Diesel Particulate Filter on page 9‑12.

1-4 In Brief Special DPF Driver Messages If the vehicle is used for numerous short trips or extended slow-speed operation, the engine computer may not be able to adequately heat up the exhaust system to clean the DPF effectively. The engine computer has been designed to continuously monitor the condition of the DPF. When the engine computer detects that the DPF is nearly full of particulates and that the vehicle is not being operated in a manner that would allow effective automatic DPF cleaning, the Driver Information Center will display the message CLEANING EXHAUST FILTER KEEP DRIVING UNTIL MESSAGE IS CLEARED. If the vehicle continues to be driven in a manner that prevents effective DPF cleaning, the DPF will become plugged with particulates. If this occurs, the engine computer will turn on the Service Engine Soon Light in the instrument cluster and the DIC will display the message REDUCED ENGINE POWER. See Diesel Particulate Filter on page 9‑12 and Engine Power Messages on page 5‑11. Fuel Use Ultra-Low Sulfur Diesel Fuel (ULSD) Use Ultra-Low Sulfur Diesel Fuel (ULSD) only. The emission control hardware used on the vehicle may be damaged by using fuel with high sulfur levels. Use only fuel that is dispensed from pumps bearing the ULSD label. Do Not Use Low Sulfur Diesel Fuel (LSD) Do not use fuel that is dispensed from pumps bearing the LSD label. Do Not Use Non-Highway Fuel Fuel labeled as off road or non-highway is typically very high in sulfur content and will damage the emission control system. Non-Highway fuel is not intended for use in on-highway vehicles and does not have the fuel properties needed by the DPF-equipped Duramax Diesel. In addition: . Use the correct engine oil. . Do not add gasoline to diesel fuel. . Do not modify the induction or exhaust systems. See Fuel for Diesel Engines on page 9‑21 and Engine Oil on page 10‑7.

In Brief 1-5 Diesel Exhaust Fluid Diesel Exhaust Fluid (DEF) is used with diesel engines to reduce the amount of regulated emissions produced. The DEF system must be maintained for the vehicle to run properly. 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 fuelling stations or retailers may also have DEF for purchase. For vehicles with an active OnStar ® subscription, OnStar can help to locate a DEF retailer. For more information on locating DEF see www.afdc.energy.gov/afdc/locator/ def/. See “Customer Assistance Offices” in the owner manual for phone numbers to assist you in contacting a GM dealer. See Recommended Fluids and Lubricants on page 11‑13. As the DEF tank becomes low on fluid, warnings begin with approximately 1600 km (1000 miles) of remaining range. These warnings will increase in intensity 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 on page 9‑14.

1-6 In Brief 2 NOTES

2012 CHEVY / CHEVROLET Duramax Diesel Supplement Owners Manual

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