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 2008 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
- With the scan tool, verify tire pressure sensors ID and locations:
- Rapidly reduce the tire pressure for each wheel at least 6 psi within 30 seconds. It may take up to 3 minutes for the display to change.
- Record the sensor ID and location.
- If any of the parameters listed above do not change or are not displayed for one sensor, replace the suspect tire pressure sensor.
- Disconnect the harness connector at the Tire Pressure Control Module.
- Disconnect the harness connector at the Tire Pressure Receiver Module.
- Test for less than 1 ohm of resistance between the 5-volt reference circuit terminal 6 and terminal 5.
- If greater than the specified value, test the 5-volt reference circuit for an open/high resistance.
- Test for less than 1 ohm of resistance between the signal circuit terminal 12 and terminal 1.
- If greater than the specified value, test the signal circuit for an open/high resistance.
- Test for less than 1 ohm of resistance between the ground circuit terminal 11 and terminal 4.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- Test for infinite resistance between the 5-volt reference circuit terminal 6 and ground.
- If not the specified value, test the 5-volt reference circuit for a short to ground.
- Test for infinite resistance between the signal circuit terminal 12 and ground.
- If not the specified value, test the signal circuit for a short to ground.
- Enable the TPM learn mode. Verify all 4 sensor locations, IDs, and tire pressures match what the scan tool displays.
- If the scan tool data does not display, replace the Tire Pressure Receiver Module. If DTC sets again, replace the Tire Pressure Control Module
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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.