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 VARIANT/TRIMSECTION 12 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - DTC P0300 TO DTC P0699)DTC P0640DIAGNOSTIC FAULT INFORMATION
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Diagnostic Fault Information
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Diagnostic Fault Information
WARNING: This page is about a different variant/trim than selected.
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
| IA Heater Temperature Signal | - | P154D | P154D |
| IA Heater Command 2 | P154B | P154B | P154B |
| IA Heater Voltage Signal | P154B | P154B | P154B |
| IA Heater Command 1 | P154B | P154B | P0640 |
| IA Heater Current Signal | P154C | P154C | P154C |
| IA Heater Feedback Signal | P154A | P154A | P154A |
| IA Heater Battery Positive Voltage | P154B | P154B | - |
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.