Harsh 2-1 Downshift or 1-2 Upshift (Reprogram Transmission Control Module (TCM))
| Subject: | Harsh 2-1 Downshift or 1-2 Upshift (Reprogram Transmission Control Module (TCM)) |
| Models: | 2004 Chevrolet Epica |
| with ZF-4HP 16 Automatic Transaxle |
| Attention: | This bulletin no longer applies to the Chevrolet Optra. |
This bulletin is being revised to remove the Optra model. Please discard Corporate Bulletin Number 04-07-30-040 (Section 07 - Transmission/Transaxle).
Condition
Some customers may comment on a harsh 2-1 downshift and/or a 1-2 upshift.
Correction
Reprogram the TCM with new calibrations that will improve the shift quality.
Parts Information
Important: Do not attempt to order the software or calibration numbers from GMSPO. The software and calibration numbers are programmed into the TCM via a Techline tool device.
The service software and calibration is included in TIS data version 9.75 broadcast to dealers via GM Access on September 27, 2004 and on TIS 2000 CD-ROM version 10.0 available October 2004.
Model | Engine | Transaxle | TCM Software and Calibration Data ID |
|---|---|---|---|
2004 Chevrolet Epica | 2.5L L6 (VIN L - RPO LBK) | ZF-4HP 16 | ECU-SW No: 6581075568 Cal-No: 6581075683 |
Warranty Information
For vehicle repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
K5364 | Module, Transmission Control - Reprogram | Use Published Labor Operation Time |
