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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 401 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 3.6L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSENGINE CONTROL MODULE REPLACEMENTREMOVAL PROCEDURE
2008 Pontiac Grand Prix Base

Removal Procedure

2008 Pontiac Grand Prix BaseSECTION Removal Procedure
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  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 Connector Lever Lock & Lock Slide
    GM1285259Courtesy of GENERAL MOTORS CORP.
  2. Turn the ignition OFF.
    3. IMPORTANT: Ensure that there is no main relay circuit voltage (ECM Fuse).
  3. Use a DVOM in order to measure the main relay circuit voltage at the engine control module (ECM) fuse in the underhood fuse block. Refer to Electrical Center Identification Views .
  4. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection (LY7) .
  5. Remove the ECM fuse in the underhood fuse block. Refer to Electrical Center Identification Views .
  6. Remove the TCM/IPC fuse in the underhood fuse block. Refer to Electrical Center Identification Views .
  7. Remove the ECM/TCM fuse in the underhood fuse block. Refer to Electrical Center Identification Views .
  8. Unlock the body side (outboard) ECM electrical connector.
    1. Depress the ECM electrical connector lever lock (1).
    2. Simultaneously rotate the ECM connector clamp lever and depress the lock slide (2).
    9. NOTE: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.
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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.