A/T Controls -Transmission Control Module Information
INFORMATIONBulletin No.: 05-07-30-016C
Date: October 07, 2009
Subject: Transmission Control Module (TCM) Shorted To Battery Voltage During Diagnosis, Service or Jump-Starting
Models:
2005-2010 Chevrolet Cobalt
2006-2010 Chevrolet HHR
2006-2010 Chevrolet Express
2006-2010 GMC Savana
2005-2006 Pontiac Pursuit (Canada)
2007-2010 Pontiac G5
2005-2007 Saturn ION
with 4T40-E or 4T45-E or 4L60-E Automatic Transmission (RPO MN4, MN5, M30)
Supercede:
This bulletin is being revised to add models and update the model years. Please discard Corporate Bulletin Number 05-07-30-016B (Section 07 - Transmission/Transaxle).
It has been found during warranty part reviews of the TCM at the Warranty Parts Center (WPC) that the TCM is possibly being shorted to battery voltage during vehicle diagnosis and/or repairs when the vehicle is brought to the dealer for any number of reasons.
It has been found that if the positive battery jump start post/terminal cover is removed and/or missing, and the TCM comes in contact with the positive battery jump start post/terminal during diagnosis and/or service, the TCM WILL BE DAMAGED and require replacement.
Service Precautions
- Prior to removing the TCM from its mounting bracket, disconnect the negative battery cable. Refer to the appropriate SI Document.
- If service requires the negative battery cable to be installed for diagnostic purposes, unplug the TCM before it is removed from its mounting bracket. Unplugging the TCM will eliminate the possibility of damaging the module during diagnosis and/or repair.
Caution
Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle's battery. DO NOT us the TCM or its mounting bracket/fasteners as the ground connection when jump-starting.
DO NOT allow the TCM to come in contact with the positive battery jump start post/terminal during diagnosis and/or repairs.
Do NOT allow any part of the TCM to come into contact with the positive battery jump start post/terminal.
Disclaimer