Silverado Classic 3500 4WD V8-6.6L DSL Turbo (2007)
Technical Service Bulletin # 09038A
Date: 100929
Campaign - Transmission Overheats In Cold Weather
CUSTOMER SATISFACTION
Bulletin No.: 09038A
Date: September 29, 2010
Subject: 09038A - Enhanced Calibration for Transmission Overheat in Extreme Cold Air Temperatures
Models:
2006-2008 Chevrolet Silverado HD
2006-2008 GMC Sierra HD Equipped with Allison 1000 Transmission (RPO MW7) and Duramax 6.6L Diesel V8 Engine (RPO LLY/LBZ/LMM - VIN
2/D/6)
Located in Certain U.S. Cold Weather States; Alberta, British Columbia, Manitoba, Newfoundland, Northwest Territories, Ontario, Quebec,
Saskatchewan, and Yukon
Supercede:
This bulletin is being revised to extend the expiration date to September 30, 2011.Please discard all copies of bulletin 09038, issued September 2009.
THIS PROGRAM IS IN EFFECT UNTIL September 30, 2011.
Condition
Certain 2006-2008 model year Chevrolet Silverado HD and GMC Sierra HD vehicles, equipped with an Allison 1000 transmission (RPO MW7) and
Duramax 6.6L diesel V8 engine (RPO LLY/LBZ/LMM - VIN 2/D/6), and located in certain U.S. cold weather states; Alberta, British Columbia,
Manitoba, Newfoundland, Northwest Territories, Ontario, Quebec, Saskatchewan, and Yukon, may have limited or no transmission fluid (oil) flow
through the transmission oil cooler after sitting for an extended period of time, such as overnight, during extreme cold temperatures, less than -40 °F or °
C, excluding wind chill. If the "Elevated Idle Mode", cabin heater performance option is operative and the engine is allowed to idle for an extended
period of 15 to 30 minutes while cooler flow is limited, the transmission fluid may overheat, resulting in transmission damage, and subsequent failure.
These low temperatures only occur in the areas listed above, and therefore, only vehicles in these areas are involved in this program.
Correction
Dealers are to reprogram the Transmission Control Module (TCM) with a new enhanced calibration.
Vehicles Involved
Involved are certain 2006-2008 model year Chevrolet Silverado HD and GMC Sierra HD vehicles, equipped with an Allison 1000 transmission (RPO
MW7) and Duramax 6.6L diesel V8 engine (RPO LLY/LBZ/LMM - VIN 2/D/6), located in certain U.S. cold weather states; Alberta, British Columbia,
Manitoba, Newfoundland, Northwest Territories, Ontario, Quebec, Saskatchewan, and Yukon, and built within these VIN breakpoints:
Important
Dealers are to confirm vehicle eligibility prior to beginning repairs by using the Required Field Actions section in the Global Warranty system.
Not all vehicles within the above breakpoints may be involved.
For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address
