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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSTHEFT DETERRENT SYSTEMDIAGNOSTIC TESTSDTC P1631: INVALID PASSWORD RECEIVEDCONDITIONS FOR RUNNING DTC
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
Conditions For Running DTC
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Conditions For Running DTC
- DTC P1626 is not active.
- PCM is not in password learn mode.
- Passlock(tm) system is enabled.
- Fuel enable decision point has been reached, or engine is cranking.
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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.