Info - Transmission Control Module (TCM) Shorted to Battery Voltage During Diagnosis and/or Service, New Service TCM Available
| Subject: | Transmission Control Module (TCM) Shorted To Battery Voltage During Diagnosis and/or Service, New Service TCM Available |
| Models: | 2005-2006 Chevrolet Cobalt |
| 2006 Chevrolet HHR |
| 2005-2006 Pontiac Pursuit (Canada) |
| 2005-2006 Saturn ION |
| with 4T40-E or 4T45-E Automatic Transmission (RPO MN4, MN5) |
This bulletin is being revised to inform technicians of a new service TCM with protective tape. Please discard Corporate Bulletin Number 05-07-30-016A (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. |
| • | If the TCM needs to be replaced for any reason, use a new service TCM with protective tape (Chevrolet Cobalt, HHR and Pontiac Pursuit only). |
Notice: 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 allow the TCM to come in contact with the positive battery jump start post/terminal during diagnosis and/or repairs.
Positive Battery Jump Post/Terminal (Remote Positive Terminal) Location
The location of the positive battery jump post/terminal for each vehicle is shown in the following illustrations. Do NOT allow any part of the TCM to come into contact with the positive battery jump start post/terminal.
Chevrolet Cobalt and Pontiac Pursuit
Chevrolet HHR
Saturn ION
Parts Information
If the TCM needs to be replaced for any reason, use a new service TCM with protective tape (Chevrolet Cobalt, HHR and Pontiac Pursuit only).
Part Number | Description |
|---|---|
24239427 | Module, Trans Cont (2005 MY Cobalt/Pursuit) |
24239224 | Module, Trans Cont (2006 MY Cobalt, HHR/Pursuit) |
