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Home >> Cadillac >> 2005 >> Escalade EXT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.8L, 5.3L & 6.0L - Introduction >> Repair Instructions >> Powertrain Control Module (PCM) Replacement >> Removal Procedure
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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 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 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. Fig 1: View Of PCM Cover & Mounting Bracket
    GM814118Courtesy of GENERAL MOTORS CORP.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  3. Release the PCM cover mounting tabs.
  4. Release the PCM cover from the mounting brackets.
  5. Remove the PCM cover.
    6. Fig 2: View Of PCM Electrical Connectors & Bolts
    GM814117Courtesy of GENERAL MOTORS CORP.
    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.
  6. Loosen the PCM electrical connector bolts (2).
  7. Disconnect the PCM electrical connectors.
    8. Fig 3: View Of PCM
    GM814119Courtesy of GENERAL MOTORS CORP.
  8. Release the spring latch from the PCM.
  9. Release the PCM mounting tabs from the PCM.
  10. Remove the PCM.
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