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Home >> Buick >> 2005 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 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%. 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 in Engine Electrical.
    3. Fig 1: View Of Air Cleaner Housing, Bolts, PCM & Harness
    GM444496Courtesy of GENERAL MOTORS CORP.
  3. Remove the air cleaner housing cover assembly. Refer to Air Cleaner Assembly Replacement .
  4. Without disconnecting the PCM connectors, remove the PCM (4) and the harness from the air cleaner housing.
  5. Disconnect the PCM connectors and remove the PCM from the connectors.
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