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Home >> GMC >> 2005 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls - 6.6L (Introduction)) >> Repair Instructions >> Engine Control Module (ECM) Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
  • To prevent internal ECM damage, the ignition switch must be OFF when disconnecting or connecting power to the ECM.
  • Remove any debris from the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM.
  • The replacement ECM must 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. Fig 1: View Of ECM Electrical Connectors
    GM1334384Courtesy of GENERAL MOTORS CORP.
  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. Disconnect the ECM electrical connectors (2).
    4. Fig 2: ECM Cover Retaining Tabs
    GM1334382Courtesy of GENERAL MOTORS CORP.
  4. Release the ECM cover retaining tabs.
  5. Remove the ECM cover from the bracket.
  6. Remove the ECM cover.
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