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 226 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC CODE INDEX
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Diagnostic Code Index
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Diagnostic Code Index
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.
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC P0480 or P0481 (with RPO LC3 or LH2) | P0480: Cooling Fan Relay 1 Control Circuit P0481: Cooling Fan Relay 2 Control Circuit |
| DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT) | P0480: Cooling Fan Relay 1 Control Circuit P0481: Cooling Fan Relay 2 Control Circuit P0691: Cooling Fan Relay 1 Control Circuit Low Voltage P0692: Cooling Fan Relay 1 Control Circuit High Voltage P0693: Cooling Fan Relay 2 Control Circuit Low Voltage P0694: Cooling Fan Relay 2 Control Circuit High Voltage |
| DTC P1258 (V6) | P1258: Engine Coolant Overtemperature - Protection Mode Active |
| DTC P1258 (with RPO LC3 or LH2) | P1258: Engine Coolant Overtemperature - Protection Mode Active |
| DTC P2600, P2602, or P2603 | P2600: Auxiliary Coolant Pump Relay Control Circuit P2602: Auxiliary Coolant Pump Relay Control Circuit Low Voltage P2603: Auxiliary Coolant Pump Relay Control Circuit High Voltage |
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.