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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 225 (ENGINE CONTROLS AND FUEL - 4.6L (LH2) - INTRODUCTION)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 car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of ECM

Courtesy of GENERAL MOTORS CORP.

Install the ECM to the vehicle.

NOTE: Refer to Fastener Notice .

Install the ECM mounting nuts (2).
Tighten: Tighten the nuts to 8 N.m (71 lb in).
Connect the ECM electrical connectors (1).

Fig 2: View Of Front Air Deflector And Push Pin retainers

Courtesy of GENERAL MOTORS CORP.

Install the front air deflector. Refer to Front Air Deflector Replacement .
Lower the vehicle.
Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
Program the ECM. Refer to Control Module References for programming and setup information.

RENDER: 1.0x

NO RELATED

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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.