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 VARIANT/TRIMSECTION 8 (ENGINE CONTROLS AND FUEL - 2.2L (L61) - DTC P0016 TO DTC P0420)DTC P0335 OR P0336CIRCUIT/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 variant/trim than selected.
- Ignition OFF, disconnect the harness connector at the CKP sensor.
- Ignition OFF, test for less than 1 ohm between the low reference circuit terminal 2 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition ON, engine OFF, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
- If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
- If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition ON, engine OFF, test for 4.8-5.2 volts between the signal circuit terminal 3 and ground.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition OFF, connect a fused jumper wire to signal circuit terminal 3.
- Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post repeatedly. The CKP Active Counter should increment.
- If the CKP Active Counter increments, test or replace the CKP sensor.
- If the CKP Active Counter does not increment, replace the ECM.
- Ignition OFF, inspect the CKP sensor for correct installation.
- If the CKP sensor is loose, inspect the sensor and the O-ring for damage. Replace as necessary.
- Inspect the engine for the following conditions:
- Engine oil for debris
- Crankshaft reluctor wheel for damage
- Timing chain, tensioner, and sprockets for wear or damage
- If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components.
- If all circuits and components test normal, test or replace the CKP sensor.
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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.