Sierra 2500 2WD V8-6.6L DSL Turbo (2007)
Technical Service Bulletin # 07293C
Date: 090216
Campaign - Campaign - TCM Update For A/T Overheating
# 07293C: Customer Satisfaction - Transmission Overheat in Extreme Cold Air Temperatures - Reprogram TCM - (Feb 16, 2009)
Subject:
07293C - Transmission Overheat in Extreme Cold Ambient Temperatures - Reprogram TCM
Models:
Certain 2006-08 Chevrolet Silverado HD
Certain 2006-08 GMC Sierra HD
Equipped with Allison 1000 Transmission (RPO MW7); Duramax 6.6L Diesel V8 (RPOs LLY/LBZ/LMM - VIN 2/D/6) Engine
Located in Alaska and Minnesota; Canadian Yukon Territory, Northwest Territory, British Columbia, Alberta, Manitoba, Saskatchewan, Ontario,
Quebec, and Newfoundland
THIS BULLETIN IS BEING REVISED TO EXTEND THE EXPIRATION DATE TO FEBRUARY 28, 2010. PLEASE DISCARD ALL COPIES OF
BULLETIN 07293B, ISSUED MARCH 2008.
THIS RECALL IS IN EFFECT UNTIL FEBRUARY 28, 2010.
Condition
Certain 2006-08 Chevrolet Silverado HD and GMC Sierra HD model vehicles, equipped with Allison 1000 Transmission (RPO MW7); Duramax 6.6L
Diesel V8 (RPO's LLY/LBZ/LMM - VIN 2/D/6), 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, and
therefore this program only includes vehicles located in, Alaska, Yukon Territory, Northwest Territory and far northern or western plains areas of;
Alberta, British Columbia, Minnesota, Manitoba, Newfoundland, Ontario, Quebec, and Saskatchewan.
Correction
Dealers are to reprogram the Transmission Control Module (TCM).
Vehicles Involved
Involved are certain 2006-08 Chevrolet Silverado HD and GMC Sierra HD model vehicles, located in Alaska, Yukon Territory, Northwest Territory and
far northern or western plains areas of; Alberta, British Columbia, Minnesota, Manitoba, Newfoundland, Ontario, Quebec, and Saskatchewan, and
equipped with Allison 1000 Transmission (RPO MW7) and Duramax 6.6L Diesel V8 (RPOs LLY/LBZ/LMM - VINs 2/D/6) engine and built within the
VIN breakpoints shown above.
For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address
