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.
2009 Hummer H3 AlphaFACTORY OEM SERVICE PROCEDURE
Removal Procedure
- Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
- Remove the windshield washer solvent container. Refer to Windshield Washer Solvent Container Replacement .
- Disengage the integral connector position assurance (CPA) retainer (1) on the body wiring harness electrical connector.
- Disconnect the body wiring harness electrical connector (2) from the ECM.
- Disengage the integral CPA retainers on the engine wiring harness electrical connectors.
- Disconnect the engine wiring harness electrical connectors (2) from the ECM.
- Lift up the ECM bracket tabs (2) and tilt the ECM (1) towards the front of the vehicle, removing the ECM (1).
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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