GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 CTS 🢒 Engine 🢒 Engine Electrical 🢒 Powertrain Control Module Replacement

Removal Procedure

    Notice: Turn the ignition OFF when installing or removing the PCM connectors and disconnecting or reconnecting the power to the PCM (battery cable, PCM pigtail, PCM fuse, jumper cables, etc.) in order to prevent internal PCM damage.

    Important: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.

    Important: It is necessary to record the remaining automatic transmission fluid life. If the replacement module is not programed with the remaining automatic transmission fluid life, the automatic transmission fluid life will default to 100%. If the replacement module is not programmed with the remaining automatic transmission fluid life, the automatic transmission fluid will need to be changed at 83000 km (50,000 mi) from the last automatic transmission fluid change.

  1. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
  2. Turn OFF the ignition.
  3. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.

    4. Object Number: 699902 Size: SH
  4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Remove the front air deflector. Refer to Front Air Deflector Replacement in Body Front End.

    6. Object Number: 1412206 Size: SH
  6. Remove the bolt (1) from the powertrain control module (PCM) housing cover.
  7. Push the cover outboard to release the locking tab.
  8. Swing the cover open and remove the cover from the vehicle.

    9. Object Number: 1412209 Size: SH
  9. Remove the PCM from the housing.
  10. Loosen the screws (1) at the PCM electrical connectors.
  11. Disconnect the PCM electrical connectors.
  12. Remove the PCM from the vehicle.

Installation Procedure

    Object Number: 1412209 Size: SH
  1. Install the PCM to the vehicle.
  2. Install the PCM wiring harness.

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Tighten the PCM electrical connector screws (1).

    4. Tighten
    Tighten the PCM electrical connector bolts to 8 N·m (71 lb in).

  4. Install the PCM to the PCM housing.

    5. Object Number: 1412206 Size: SH
  5. Install the PCM housing cover.
  6. Install the bolt (1) to the PCM cover housing.

    7. Tighten
    Tighten the PCM housing cover bolt to 10 N·m (89 lb in).


    Object Number: 699902 Size: SH
  7. Install the front air deflector. Refer to Front Air Deflector Replacement in Body Front End.
  8. Lower the vehicle.
  9. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  10. Program the PCM. Refer to Control Module References for programming and setup information.