GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 Express 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Powertrain Control Module Replacement

Service of the powertrain control module (PCM) should normally consist of either replacement of the PCM or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures call for the PCM to be replaced, the PCM should be inspected first to see if the correct part is being used. If the correct part is being used, remove the faulty PCM and install the new service PCM.

Notice: 

   • Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage.
   • 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 vehicle battery.
   • In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board.
   • Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module.
   • The replacement control module must be programmed.

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 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last engine oil change.

Removal Procedure
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.

    2. Object Number: 1204499 Size: SH
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .

    3. Notice: Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD) damage to the PCM.

  3. Disconnect the PCM harness connectors.
  4. Release the spring latch from the PCM.
  5. Lift the PCM from the PCM mounting tray.
  6. Remove the PCM from the engine compartment.

Installation Procedure

    Object Number: 1204499 Size: SH
  1. Install the PCM to the PCM mounting tray.
  2. Secure the spring latch to the PCM.

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

  3. Connect the PCM connectors to the PCM.

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

  4. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  5. If a new PCM is being installed, program the PCM. Refer to Control Module References .