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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 935 (ENGINE CONTROLS/FUEL - HYBRID (LZ1) - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSENGINE CONTROL MODULE REPLACEMENTREMOVAL PROCEDURE
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Removal Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Removal Procedure
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Engine Wiring Harness Electrical Connector & ECM
    GM1960211Courtesy of GENERAL MOTORS COMPANY
  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 Disconnection and Connection .
  3. Remove the battery and battery tray. Refer to Battery Tray Replacement .
  4. Remove the under hood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement .
  5. Disengage the engine wiring harness electrical connector retainers and remove the connectors (2) from the ECM (1).
    6. Fig 2: View Of Bracket Retainer Tabs, ECM Bracket & Tab
    GM1960213Courtesy of GENERAL MOTORS COMPANY
  6. Disengage the bracket retainer tabs (1) securing the ECM to the bracket.
  7. Remove the ECM (3) from the bracket.
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.