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 410 (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0800 (AFS)CIRCUIT/SYSTEM TESTING (AFS)
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing (AFS)
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing (AFS)
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 harness connectors at the AFS module.
- Ignition OFF, test for less than 3.0 ohms between the ground circuit terminals listed below and ground.
- Terminal 1 X2
- Terminal 3 X3
- If greater than the specified value, test the affected ground circuit for an open/high resistance.
- Ignition ON, verify a test lamp illuminates between the B+ circuits listed below and ground.
- Terminal 2 X2
- Terminal 1 X3
- If the test lamp did not illuminate, test the affected B+ circuit for a short to ground or an open/high resistance.
- If all circuits test normal, replace the AFS module.
RENDER: 1.0x
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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.