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 1807 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC CODE INDEX
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Diagnostic Code Index
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Diagnostic Code Index
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.
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC P0480 or P0481 | P0480: Cooling Fan Relay 1 Control Circuit P0481: Cooling Fan Relay 2 Control Circuit |
| DTC P0480, P0481, P0691, P0692, P0693, or P0694 (V6) | 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-P2603 | P2600: Auxiliary Coolant Pump Relay Control Circuit P2601: Auxiliary Coolant Pump Performance 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.