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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSENGINE CONTROL MODULE REPLACEMENTINSTALLATION PROCEDURE
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Installation Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Installation Procedure
WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying ECM Upper Retaining Tabs
    GM1655954Courtesy of GENERAL MOTORS CORP.
  1. Place the bottom edge of the ECM into the bracket lower retainers.
  2. Install the washer solvent container. Refer to Windshield Washer Solvent Container Replacement .
  3. Push the ECM towards the bracket until the upper edge of the ECM snaps into place.
    4. Fig 2: Identifying ECM Electrical Connector
    GM1655955Courtesy of GENERAL MOTORS CORP.
  4. Connect the ECM electrical connectors.
  5. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  6. If a NEW ECM was installed, program the ECM. Refer to Control Module References .
  7. Perform the turbocharger learn procedure. Refer to Turbocharger Learn .
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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.