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 Buick LaCrosse and 2007 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, use the scan tool. Go to the PPS menu, then retrieve the DTCs. Refer to Passenger Presence System Flash Code Procedures . Verify DTC 034 or DTC 036 does not set.
- If either DTC 034 or DTC 036 sets then refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Check to see if the PPS has been replaced. Verify the correct PPS has been installed.
- If the incorrect PPS was installed replace with the correct PPS. Then perform the Passenger Presence System Rezeroing .
- Perform the Passenger Presence System Rezeroing and recheck for DTC 0056. Verify that DTC 0056 does not reset.
- If DTC 0056 sets, then replace the PPS and rezero.
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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.