TCM Reprogramming

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WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

If programming is required, perform the following procedure. 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.
Ensure that the TCM has the latest software version.
The Techline equipment cable connection at the data link connector (DLC) is secure.
Inspect the Techline equipment for the latest software version.

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.