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Home >> Cadillac >> 2004 >> Seville >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls -- 4.6L - Introduction >> Repair Instructions >> Powertrain Control Module (PCM) Replacement >> Removal Procedure
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Removal Procedure

NOTE: Turn the ignition OFF when installing or removing the PCM connectors and disconnecting or reconnecting the power to the PCM (battery cable, PCM pigtail, PCM fuse, jumper cables, etc.) in order to prevent internal PCM damage.
    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.
    IMPORTANT: It is necessary to record the remaining automatic transmission fluid life. If the replacement module is not programed with the remaining automatic transmission fluid life, the automatic transmission fluid life will default to 100%. If the replacement module is not programmed with the remaining automatic transmission fluid life, the automatic transmission fluid will need to be changed at 83000 km (50,000 mi) from the last automatic transmission fluid change.
  1. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
  2. Turn OFF the ignition.
  3. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  4. Fig 1: View of Intake Air Duct/Resonator to PCM Housing Screw
    GM104644Courtesy of GENERAL MOTORS CORP.
  5. Remove the screw retaining the intake air duct/resonator (3) to the PCM housing.
  6. Fig 2: View of Air Duct/Resonator Assembly & Air Cleaner Cover
    GM104607Courtesy of GENERAL MOTORS CORP.
  7. Unsnap the air filter housing clamps on top of the air cleaner housing assembly.
  8. Pull the intake air duct/resonator assembly (2) up enough to remove the air cleaner cover (3) and the PCM.
  9. Slide the air cleaner element assembly toward the fender to separate the air cleaner element assembly from the air inlet assembly.
  10. Fig 3: Identifying PCM
    GM1379393Courtesy of GENERAL MOTORS CORP.
  11. Partially remove the PCM (1) from the housing.
  12. Release the connector locks and disconnect the PCM electrical connectors (3).
  13. Remove the PCM (1).