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Home >> GMC >> 2001 >> Sierra 2500 HD, 2D Pickup, 6.6 1, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.6L - Repair Instructions >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure

Removal Procedure

    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%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.

  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Disconnect the negative battery cable from the battery and move aside.
    3. Fig 1: PCM Mounting Hardware And Harness Connectors
    GM334905Courtesy of GENERAL MOTORS COMPANY
  3. Release the ECM cover mounting holes (1,5) away from the mounting tabs on the ECM mounting bracket.
  4. Release the ECM cover (8) from the mounting bracket.
  5. Remove the ECM cover.
    6. NOTE:

    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.

  6. Disconnect the ECM harness connectors (6).
  7. Release the spring latch (2) from the ECM.
  8. Release the ECM mounting tabs (3) from the ECM.
  9. Remove the ECM (4) from the engine compartment.
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