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 LS, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 12 (ENGINE CONTROLS AND FUEL - 2.0L - DTC P2088 TO DTC P2310)DTC P2090 OR P2091CIRCUIT/SYSTEM TESTING
2008 Chevrolet HHR LS, Automatic
Circuit/System Testing
2008 Chevrolet HHR LS, AutomaticSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Ignition ON, measure for battery voltage between the CMP actuator solenoid ignition voltage and ground.
- If less than battery voltage, test the CMP actuator solenoid ignition voltage circuit for an open, short to ground.
- Connect a test lamp between the CMP actuator solenoid control circuit and battery voltage. The test lamp should not illuminate.
- If the test lamp illuminates, test the CMP actuator solenoid control circuit for a short to ground. If the circuit tests normal, replace the control module.
- Measure for 0 volts between the CMP actuator solenoid control and ground.
- If voltage is present, test the control circuit for a short to voltage. If the circuit tests normal, replace the control module.
- Command the CMP actuator solenoid ON. The test lamp should turn ON and OFF.
- If the test lamp does not turn ON and OFF, test the CMP actuator solenoid control circuit for an open or high resistance. If the circuit tests normal, replace the control module.
- If all circuits test normal, test or replace the CMP actuator solenoid.
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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.