GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2003 🢒 ION 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Transmission Control Module Replacement

Removal Procedure
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the ECM. Refer to Engine Control Module Replacement in Engine Controls - 2.2L (L61).

    3. Important: Use care not to damage connector retaining levers.


    Object Number: 857199 Size: SH
  3. Remove the TCM connectors from the TCM, noting proper connection points for installation.

    4. Notice: Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables or when charging the vehicles battery.

  4. Use the retaining tab in order to release the TCM from the under hood junction block bracket.
  5. Lift the TCM halfway, then rotate the TCM clockwise to remove.

Installation Procedure

    Object Number: 857199 Size: SH

    Notice: Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables or when charging the vehicles battery.

  1. Place the lower right corner of the TCM into the under hood junction block bracket.
  2. Rotate the TCM counter clockwise, then press the TCM downward until fully seated.
  3. Install the TCM harness connectors to the TCM, as noted during removal.
  4. Install the ECM. Refer to Engine Control Module Replacement in Engine Controls - 2.2L (L61).
  5. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  6. Program the TCM. Refer to Transmission Control Module Reprogramming .