GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 HHR 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Transmission Control Module Replacement

Removal Procedure
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Remove the cover from the engine control module (ECM) and transmission control module (TCM).

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


    Object Number: 1740247 Size: SH
  3. Remove the electrical harness connector from the TCM.

    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. Press the retaining tab (1) in order to release the TCM from the under hood junction block bracket.
  5. Remove the TCM (2) from the under hood junction block bracket.

Installation Procedure

    Object Number: 1740247 Size: SH
  1. Place the TCM (2) into the under hood junction block bracket (3).
  2. Install the TCM electrical harness connector to the TCM.
  3. Install the cover on the ECM and TCM.
  4. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  5. Program the TCM. Refer to Control Module References for programming and setup information.