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.
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedFACTORY OEM SERVICE PROCEDURE
Installation Procedure
- Install the ECM (4) to the ECM bracket tabs (2).
- Ensure that the ECM bracket tabs (3) fully engage the ECM.
- Connect the engine wiring harness electrical connectors (2) to the ECM (1).
- 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 .
- Using a scan tool, set the remaining engine oil life.
Factory Service Tools
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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.
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