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 516 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0564CIRCUIT/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 2011 GMC Canyon and 2011 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X204 harness connector at the turn signal/multifunction switch.
- Ignition ON, test for B+ between the B+ circuit terminal A8 and ground.
- If less than the specified value, test the circuit for a short to ground or an open/high resistance.
- Verify the scan tool Cruise ON/OFF switch parameter displays OFF.
- If not the specified value, test the signal circuit terminal B8 for a short to voltage. If the circuit tests normal, replace the ECM.
- Install a 3A fused jumper wire between the signal circuit terminal B8 and the B+ circuit terminal A8. Verify the scan tool Cruise ON/OFF Switch parameter displays ON.
- If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
- If all circuits test normal, test or replace the turn signal/multifunction switch.
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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.