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 219 (POWER STEERING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0800CIRCUIT/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 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Verify that stop lamp DTCs are not set as current or history before performing this diagnostic. If stop lamp DTCs are set as current or history, go to Lighting
for diagnose.
- Ignition OFF, disconnect the harness connector of the AFS control module.
- Ignition ON, test for 11 volts or greater between the power 1 voltage circuit terminal and ground.
- If less than the specified voltage, test the power 1 voltage circuit for a short to ground or an open/high resistance. If the circuit test normal and the fuse is open, test the voltage circuit for a short to ground. If the circuit tests normal, test or replace the RUN/CRANK relay.
- If all circuits test normal, and the DTC resets as current, replace the AFS control module.
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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.