GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (PCM)

Notice: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.

Service of the PCM should normally consist of either replacement of the PCM, EEPROM re-programming or a KS module change.

If the diagnostic procedures call for the PCM to be replaced, the PCM should be checked first to see if it is the correct part. If it is, remove the KS module from the faulty PCM and install it in the new service PCM. The service PCM will not contain a KS module. DTC P0601 indicates the EEPROM programming has malfunctioned. When DTC P0601 is obtained, re-program the EEPROM. If a DTC P0325 is set, check the KS module for proper installation. If it is installed correctly and DTC P0325 is still displayed, replace the KS module.

The ignition should be OFF for at least 10 seconds before disconnecting power to the PCM so the IAC valve has time to move to the engine OFF position.

Removal Procedure

Important: To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to PCM (for example, battery cable, PCM pigtail, PCM fuse, jumper cables, etc.). The ignition should be OFF for at least 10 seconds before disconnecting power to the PCM so the IAC valve has time to move to the engine OFF position.


    Object Number: 13301  Size: MH
  1. Disconnect the negative battery cable.
  2. Remove the RH hush panel.
  3. Disconnect the PCM electrical connectors (2).
  4. Important: PCM removal is eased when the glove box door is opened.

  5. Remove the PCM mounting bolt (1).
  6. Remove the retainer from the PCM.
  7. Notice: Clean the PCM housing of any debris that may cause damage to the PCM circuitry before removing the KS module cover.

  8. Slide the PCM (3) and retainer from the PCM bracket.

  9. Object Number: 10782  Size: SH

    Notice: In order to prevent possible electrostatic discharge (ESD) damage to the PCM or KS module, do not touch the connector pins or soldered components on the circuit board. Do not remove the integrated circuit boards from the carrier.

  10. Remove the KS module cover.

  11. Object Number: 10783  Size: SH
  12. Remove the KS module.

Removal Procedure

  1. Remove the new PCM from its packaging and check the service number to make sure it is the same number or updated number as the faulty PCM.

  2. Object Number: 10782  Size: SH
  3. Remove the KS module cover.

Installation Procedure

Important: Refer to the Latest Techline Information on Re-Programming or Flashing procedures.


    Object Number: 10783  Size: SH
  1. Install the KS module in the KS module socket.

  2. Object Number: 10781  Size: SH
  3. Install the KS module cover.
  4. Tighten
    Tighten the KS module cover screws to 2.8-3.2 N·m (25-28 lb. in.).

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


    Object Number: 13301  Size: MH
  5. Slide the PCM (3) into the PCM retainer.
  6. Install the PCM mounting bolt (1).
  7. Tighten
    PCM mounting bolt to 8-12 N·m (6-9 lb. ft.).

  8. Connect the PCM electrical connectors (2).
  9. Install the RH hush panel.
  10. Connect the Negative battery cable.