Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1878 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L LMM - INTRODUCTION)REPAIR INSTRUCTIONSENGINE CONTROL MODULE REPLACEMENTINSTALLATION PROCEDURE

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Installation Procedure

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Installation Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying ECM Upper Retaining Tabs

Courtesy of GENERAL MOTORS CORP.

Place the bottom edge of the ECM into the bracket lower retainers.
Install the washer solvent container. Refer to Windshield Washer Solvent Container Replacement .
Push the ECM towards the bracket until the upper edge of the ECM snaps into place.

Fig 2: Identifying ECM Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Connect the ECM electrical connectors.
Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
If a NEW ECM was installed, program the ECM. Refer to Control Module References .
Perform the turbocharger learn procedure. Refer to Turbocharger Learn .

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.