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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 996 (ENGINE CONTROLS - 6.6L (LLY) (INTRODUCTION))REPAIR INSTRUCTIONSENGINE CONTROL MODULE (ECM) REPLACEMENTREMOVAL PROCEDURE
2004 Oldsmobile Bravada AWD

Removal Procedure

2004 Oldsmobile Bravada AWDSECTION Removal Procedure
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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. 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).
    Fig 1: View Of ECM Electrical Connectors
    GM1334384Courtesy of GENERAL MOTORS CORP.
    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.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.