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Engine Control Module Replacement

Pre-Removal Procedure

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, jump leads, 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.

Removal Procedure

Warning: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

For Vehicles equipped with OnStar® (UE1) with Back Up Battery:

The Back Up Battery is a redundant power supply to allow limited OnStar® functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar®module). Do not disconnect the main vehicle battery or remove the OnStar® fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar® module in any way while the ignition is On or with RAP activated may cause activation of the OnStar® Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.


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  1. Turn the ignition OFF.
  2. Disconnect the battery negative cable and remove the battery. Refer to Battery Negative Cable Disconnection and Connection .

    3. 2308927
  3. Remove the engine control module (ECM) bracket retaining bolt (2).
  4. Release the ECM connector locking lever and disconnect the ECM connector.
  5. Remove the ECM retaining nut (3) from the ECM bracket (1) and remove the ECM.

Installation Procedure

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  1. Install the ECM to ECM bracket (1).

    2. Note: Connect the front electrical connector to the ECM first.

  2. Connect the ECM connector and lock the ECM connector locking lever.

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

  3. Install the ECM bracket (1) to battery tray and tighten the ECM bracket retaining bolt (2) to 10 N·m (88.5 lb in).
  4. Install the battery and connect the negative battery cable.
   


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