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.
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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 55 (MANUAL TRANSAXLE - MU3)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0501CIRCUIT/SYSTEM TESTING
2008 Chevrolet HHR LT, 2.4 P, Automatic
Circuit/System Testing
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the ECM X2 harness connector.
- Measure for 1,300-1,500 ohms at 25°C (77°F) between the VSS high signal circuit terminal 53 and the VSS low signal circuit terminal 40.
- If the value is greater than 1,500 ohms test the VSS high signal circuit and the VSS low signal circuit for an open/high resistance. If the circuits/connections test normal, replace the vehicle speed sensor.
- If the value is less than 1,300 ohms test the VSS high signal and the VSS low signal circuits for a shorted together condition. If the circuits/connections test normal, replace the vehicle speed sensor.
- Measure for more than 10 ohms of resistance between the VSS high signal circuit terminal 53 and ground.
- If the value is less than the specified range, repair the short to ground.
- Measure for more than 10 ohms of resistance between the VSS low signal circuit terminal 40 and ground.
- If the value is less than the specified range, repair the short to ground.
- Reconnect the ECM connector. Disconnect the VSS connector.
- Ignition ON, test the VSS high signal circuit terminal B for a short to voltage.
- If all circuits/connections test normal, test or replace the VSS.
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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.