LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2003 >> CTS Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - 5L40-E >> Programming >> Transmission Control Module
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Transmission Control Module

  1. The Transmission Control Module (TCM) must be programmed with the proper software/calibrations. Ensure that the following conditions exist in order to prepare for TCM programming:
    • 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.
  2. Program the TCM using the latest software matching the vehicle. Refer to up-to-date Techline equipment user instructions.
  3. If the TCM fails to program, proceed as follows:
    • Ensure that the TCM connection is okay.
    • 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.
scientia non olet · About LEMON Manuals