TCM Reprogramming Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2005 Isuzu Ascender, 2005 GMC Envoy XUV, 2005 GMC Envoy XL, 2005 GMC Envoy, and 2005 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

If the TCM is reprogrammed, the following procedures must be performed:

Refer to Service Programming System (SPS) .

Ensure the following conditions exist in order to prepare for TCM programming or reprogramming:

The battery is fully charged.
The ignition switch is in the RUN position.
The Techline equipment cable connection at the data link connector (DLC) is secure.

Program the TCM using the latest software matching the vehicle. Refer to up-to-date Techline equipment user instructions.

If the TCM fails to program, proceed as follows:

Ensure the TCM connection is good.
Inspect the Techline equipment for the latest software version.
Attempt to program the TCM. If the TCM still cannot be programmed properly, replace the TCM.