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Home >> Buick >> 2018 >> Regal Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (LTG) - Repair Instructions >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure
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Removal Procedure

CAUTION:

Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

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.
  1. Prepare the engine control module (ECM) for the replacement - Refer to Control Module References .
    2. NOTE:

    It is necessary to record the engine oil life percentage remaining. Use the scan tool to reset the engine oil life remaining back to the original percentage recorded.

  2. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining life engine oil life.
  3. Disconnect the battery negative cable - Refer to BATTERY NEGATIVE CABLE DISCONNECTION AND CONNECTION (2.0L LTG)
  4. GM4589373
    CAUTION:

    In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.

    Electrical Connector (2)@Engine Control Module - Open & Disconnect

  5. Wiring Harness Clip (1) - Unclip
  6. GM4589375

    Engine Control Module Bracket Bolt (2) - Remove

  7. Remove the engine control module along with the engine control module bracket (1).
  8. GM4589377

    Engine Control Module Cover (3) - Remove - Unlock the retaining tabs. (4)

  9. Engine Control Module (2) - Remove
  10. Engine Control Module Bracket (3) - Remove
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