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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 466 (ENGINE CONTROLS AND FUEL - 4.6L - DTC P0335 TO DTC P2544)DTC P0351-P0358CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
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.
- Turn OFF the ignition.
- Disconnect the ECM.
- Test the affected IC circuit for the following.
- Short to voltage
- Short to ground
- Open/high resistance
- If a fault is found, repair the circuit as needed.
- Connect the ECM.
- Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
- Start the engine and observe the scan tool.
- If the DTC or the misfire transfers with the suspect ignition/coil module, replace the ignition/coil.
- If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM.
IMPORTANT:
A high resistance on any IC circuit can cause a misfire before the DTC sets.
RENDER: 1.0x
NO RELATED
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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.