GM Service Manual Online
For 1990-2009 cars only

TCM Programming

Important: The Engine Control Module (ECM) fuse should be removed when programming the Transmission Control Module (TCM).

If the ECM fuse is not removed, the ECM will interrupt the programming of the TCM. After the programming has been completed, clear the DTC's from the TCM, then the ECM in that order or the ECM DTC's will reset. Depress the brake pedal when clearing the TCM DTC's or a false DTC P0703 will set.

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1255923  Size: SH
  1. Disconnect the negative battery cable.
  2. Disconnect the wiring connectors.
  3. Remove the transaxle control module (TCM) and the nuts.

Installation Procedure

    Caution: Refer to Fastener Notice in the Preface section.


    Object Number: 1255923  Size: SH
  1. Install the TCM and the nuts.
  2. Tighten
    Tighten the TCM mounting nuts to 23 N·m (17 lb ft).

  3. Connect the wiring connectors.
  4. Connect the negative battery cable.