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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1257 (ENGINE CONTROLS AND FUEL - 4.3L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSENGINE CONTROL MODULE REPLACEMENTREMOVAL PROCEDURE

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Removal Procedure

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of ECM Components

Courtesy of GENERAL MOTORS CORP.

Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (w/Single Battery) or Battery Negative Cable Disconnection and Connection (w/Auxiliary Battery) or Battery Negative Cable Disconnection and Connection (w/Dual Batteries) .
Disengage the engine wiring harness upper electrical connector retainer (2) and remove the connector (1) from the ECM.
Disengage the engine wiring harness lower electrical connector retainer (3) and remove the connector (4) from the ECM.

Fig 2: View Of ECM & Bracket

Courtesy of GENERAL MOTORS CORP.

Disengage the retainer tabs securing the ECM to the bracket.
Remove the ECM.

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.