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.
2002 GMC C3500 HD 6.5 F, StandardFACTORY OEM SERVICE PROCEDURE
Instrument Panel DTCS
INSTRUMENT PANEL DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B0540 | Vehicle Speed Signal |
| DTC B1023 | Switch Signal Circuit Is Low |
| DTC B1367 | Ignition 0 Voltage Circuit Is Less Than 75 Percent Of Battery Voltage |
| DTC B2961 | Ignition 1 Input Signal Circuit Is High |
| DTC P0461 | No Change In Fuel Level Over Distance |
| DTC P0462 | Fuel Level Signal Low |
| DTC P0463 | Fuel Level Signal High |
| DTC P0608 | Commanded Driver State Mismatch |
| DTC P0654 | Commanded Driver State Mismatch |
| DTC P1431 | No Change In Secondary Fuel Level Over Distance |
| DTC P1432 | Secondary Fuel Level Signal Low |
| DTC P1433 | Secondary Fuel Level Signal High |
Factory Service Tools
Use the Manual With the Right Hardware
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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.