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

Warning: Replacement or reprogramming of the ECM, or replacement of the clutch pedal position sensor (CPPS) or clutch pedal requires that a CPPS learn procedure be performed. Failure to perform the CPPS learn procedure may result in personal injury or damage to the vehicle or its components if the vehicle is in gear and the starter motor is accidentally engaged.

Caution: 

   • 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.

Note: 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

    Object Number: 1631889 Size: SH
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
  3. Remove the ECM/TCM cover.

    4. Object Number: 2000940 Size: SH
  4. Disconnect the ECM electrical connectors (1).

    5. Caution: 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.

  5. Disengage the plastic retainer tabs (2) and remove the ECM (3).

    6. Object Number: 1833662 Size: SH
  6. Release the retaining tab (1) in order to release the ECM from the underhood junction block bracket.

Installation Procedure

    Object Number: 2000940 Size: SH

    Caution: 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. Install the ECM (3) by pushing straight down until the tabs (2) lock.
  2. Connect the ECM electrical connectors (1).

    3. Object Number: 1631889 Size: SH
  3. Install the ECM/TCM cover.
  4. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
  5. Program the ECM. Refer to Control Module References.
  6. If equipped with a manual transaxle, perform the clutch pedal position sensor learn procedure. Refer to Clutch Pedal Position Sensor Learn or Clutch Pedal Position Sensor Learn.