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 1782 (ENGINE CONTROLS AND FUEL - 3.6L - INTRODUCTION)REPAIR INSTRUCTIONSENGINE CONTROL MODULE REPLACEMENTREMOVAL PROCEDURE

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Removal Procedure

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

WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Engine Wiring Harness Electrical Connectors & ECM

Courtesy of GENERAL MOTORS CORP.

Using a scan tool, retrieve the percentage of remaining engine oil and automatic transmission fluid life. Record the remaining engine oil and automatic transmission fluid life.
Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Side Post) .

CAUTION: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.

Unlock and disconnect the engine wiring harness electrical connectors (1) from the ECM (2).

Fig 2: View Of Tabs, Retainers & ECM

Courtesy of GENERAL MOTORS CORP.

Use the tabs (3) in order to disengage the retainers (2) on the ECM bracket from the ECM (1) and remove the ECM.

Fig 3: Identifying Locking Tabs

Courtesy of GENERAL MOTORS CORP.

If replacing the ECM bracket perform the following steps, otherwise proceed to step 4 in the installation procedure.
Using a small flat-bladed tool, depress the locking tabs (1) on the ECM bracket.

Fig 4: View Of ECM Bracket

Courtesy of GENERAL MOTORS CORP.

Slide up and remove the ECM bracket (1).

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.