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Home >> Hummer >> 2009 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.2L - Introduction >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure
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Removal Procedure

  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
    2. Fig 1: View Of ECM Cover
    GM863123Courtesy of GENERAL MOTORS CORP.
  2. Release the ECM cover mounting holes away from the mounting tabs on the ECM mounting bracket.
  3. Release the ECM cover from the mounting bracket.
  4. Remove the ECM cover.
    5. Fig 2: View Of ECM Harness Connectors
    GM863125Courtesy of GENERAL MOTORS CORP.
    CAUTION: 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.
    CAUTION: In order to prevent internal damage to the ECM, the ignition must be OFF when disconnecting or reconnecting the ECM connector.
  5. Loosen both ECM connector retaining bolts.
  6. Disconnect the ECM harness connectors.
  7. Release the spring latch from the ECM.
  8. Release the ECM mounting tabs from the ECM.
    9. Fig 3: View Of ECM
    GM863127Courtesy of GENERAL MOTORS CORP.
  9. Remove the ECM from the engine compartment.
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