H2 V8-6.2L (2008)
PROM - Programmable Read Only Memory: Recalls
Campaign - ECM Update for OBD Improvements
SERVICE UPDATE
Bulletin No.: 07338A
Date: June 19, 2008
Subject:
07338A - Service Update for Inventory Vehicles Only - Cold Start P1400 On-Board Diagnostic (OBD) System Improvement - Reprogram ECM
Expires January 31, 2009
Models:
2008 Cadillac Escalade
2008 GMC Sierra, Yukon, Yukon XL
2008 HUMMER H2
Equipped with 6.2L V8 (RPO L92 - VIN 8) Engine and
Located in Canada and the following United States:
Alaska, Colorado, Connecticut, Delaware, Idaho, Illinois, Indiana, Iowa, Kansas, Maine, Maryland, Massachusetts, Michigan, Minnesota, Montana,
Nebraska, New Hampshire, New Jersey, New York, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Dakota, Utah,
Vermont, Virginia, Washington, Wisconsin, Wyoming
Supercede:
THIS SERVICE UPDATE BULLETIN IS BEING REVISED TO EXTEND THE EXPIRATION DATE AND UPDATE THE SERVICE
PROCEDURE.
THIS SERVICE UPDATE INVOLVES VEHICLES IN DEALER INVENTORY ONLY AND WILL EXPIRE JANUARY 31, 2009.
Purpose
This bulletin provides a service procedure to reprogram the Engine Control Module (ECM) calibration on certain 2008 Cadillac Escalade; GMC Sierra,
Yukon, Yukon XL; and HUMMER H2 vehicles, equipped with a 6.2L V8 (RPO L92 VIN - 8) engine. The revised calibration corrects a Service Engine
Soon (SES) light for DTC P1400 after a cold start. To verify if an updated calibration is required, refer to the following procedure in this bulletin. This
service procedure should be completed on involved vehicles currently in dealership inventory as soon as possible, but no later than January 31, 2009, at
which time this bulletin will expire.
Vehicles Involved
Calibration Information
Do not attempt to order the calibration number from GMSPO. The calibration numbers required for this service procedure are programmed into control
modules via a Techline Tech 2(R) scan tool and the Techline Information System (TIS) 2000 terminal with the calibration update. Use data version 12.0
for 2007 or later, available on TIS 2 Web November 26, 2007, and on TIS DVD version 12.0/ 2007 or later, mailed to dealers beginning December 5,
2007. If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.
Service Procedure
