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 DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEM - MANUALDIAGNOSTIC 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
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC B0440, B0441, or B0442 | B0440 00: Auxiliary Heater Glow Plug Circuit Low B0441 00: Auxiliary Heater Glow Plug Circuit High B0442 00: Auxiliary Heater Glow Plug Circuit Open |
| DTC B0445, B0446, or B0447 | B0445 00: Auxiliary Heater Fuel Pump Circuit Low B0446 00: Auxiliary Heater Fuel Pump Circuit High B0447 00: Auxiliary Heater Fuel Pump Circuit Open |
| DTC B0449, B0450, B0451, or B0452 | B0449 00: Auxiliary Heater Blower Fan Circuit Range/Performance B0450 00: Auxiliary Heater Blower Fan Circuit Low B0451 00: Auxiliary Heater Blower Fan Circuit High B0452 00: Auxiliary Heater Blower Fan Circuit Open |
| DTC B0455 or B0457 | B0455 00: Auxiliary Heater Coolant Sensor Circuit Low B0457 00: Auxiliary Heater Coolant Sensor Circuit Open |
| DTC B0460 or B0462 | B0460 00: Coolant Heater Overheat Sensor Circuit Low B0462 00: Coolant Heater Overheat Sensor Circuit Open |
| DTC B0465, B0467, or B0478 | B0465 00: Auxiliary Heater Flame Sensor Circuit Low B0467 00: Auxiliary Heater Flame Sensor Circuit Open B0478 00: Flame Off for Minimum Power |
| DTC B0481, B0482, or B0483 | B0481 00: Overheat Detected, Software Level B0482 00: Overheat Detected, Hardware Level B0483 00: Overheat Possible |
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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.