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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1803 (ENGINE CONTROLS AND FUEL - 4.4L - DTC P0153 TO DTC P0651)DTC P0335CIRCUIT/SYSTEM TESTINGP0335
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing: P0335
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION P0335
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the 8-way harness connector C-148.
- Test for less than 1 ohm of resistance between low reference circuit terminal B on the ECM side of the connector and ground.
- If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C on the ECM side of the connector and ground.
- If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. 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, test for 4.8-5.2 volts between the signal circuit terminal A on the ECM side of the connector and ground.
- If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
- If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition OFF, connect a fused jumper wire connected to the CKP signal circuit terminal A on the ECM side of the connector.
- Ignition ON, momentarily touch the end of the fused jumper wire to the negative battery post. The CKP active counter parameter on the scan tool should increment.
- If the CKP Active Counter parameter does not increment, replace the ECM.
- Ignition OFF, inspect the wiring harness, from the 8-way connector C-148 to the CKP sensor, for any damage, opens, or shorts.
- If the circuits test normal 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.