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.
Circuit/System Testing
2008 Pontiac Grand Prix BaseSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON. Engine OFF. Operate the I/P module disable switch to verify that the scan tool ACTIVE SWITCH data parameter does not change state but remains ENABLED.
- Engine OFF, disconnect the I/P module disable switch. Engine ON, observe the ACTIVE SWITCH data parameter.
- If the scan tool displays DISABLED, replace the I/P module disable switch. Refer to Repair Instructions .
- Test the I/P module disable signal and suppression indicator control circuits for a short. If the above condition is found, make the appropriate repair.
- Reconnect all components, with ignition ON use the scan tool to clear DTC. Recheck for DTC. IF DTC B0091 resets, replace the SDM. Refer to Repair Instructions .
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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.