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.
2006 Hummer H3 StandardFACTORY OEM SERVICE PROCEDURE
Engine Control Module (ECM)
WARNING: This page is about a different variant/trim than selected.
- Battery 1
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Displays 0.0-25.5 V. This parameter is the system voltage measured by the BCM at the BCM battery input.
- TCC Brake Switch
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Displays ON/OFF. This parameter indicates ON when the brake pedal is depressed and OFF when the brake pedal is released.
Factory Service Tools
Use the Manual With the Right Hardware
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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.