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Home >> GMC >> 2004 >> Sierra 2500, 4D Pickup, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.8L, 5.3L, & 6.0L (Introduction) >> Repair Instructions >> Powertrain Control Module (PCM) Replacement >> Removal Procedure

Removal Procedure

IMPORTANT:
  • To prevent internal PCM damage, the ignition switch must be OFF when disconnecting or connecting power to the PCM.
  • Remove any debris from around the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
  • The replacement PCM must be programmed.
    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. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  3. If equipped with regular production option (RPO) NYS, remove the harness ground clip from the PCM cover.
    4. Fig 1: Harness Ground Clip At PCM Cover
    GM865883Courtesy of GENERAL MOTORS CORP.
  4. Release the PCM cover mounting tabs.
  5. Release the PCM cover from the mounting bracket.
  6. Remove the PCM cover.
    7. Fig 2: View Of PCM Cover & Mounting Bracket
    GM814118Courtesy of GENERAL MOTORS CORP.
  7. Loosen the PCM electrical connector bolts (2).
    NOTE: Refer to PCM and ESD Notice in Cautions and Notices.
    NOTE: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.
  8. Disconnect the PCM electrical connectors.
    9. Fig 3: View Of PCM Electrical Connectors
    GM814117Courtesy of GENERAL MOTORS CORP.
  9. Release the spring latch from the PCM.
  10. Release the PCM mounting tabs from the PCM.
  11. Remove the PCM.
    12. Fig 4: View Of PCM
    GM814119Courtesy of GENERAL MOTORS CORP.
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