What does code P25C1 mean?

Q: What does code P25C1 mean?

Alternative Fuel Disable Signal Circuit. P25C1 indicates that the powertrain control module has detected a fault in the alternative fuel disable signal circuit, which is used to shut off the alternative fuel system when the vehicle switches to gasoline or when a safety condition requires it. The computer monitors the circuit for expected voltage or continuity and sets this code when the signal does not match the commanded state.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25C1

P25C1Alternative Fuel Disable Signal Circuit

P25C1 indicates that the powertrain control module has detected a fault in the alternative fuel disable signal circuit, which is used to shut off the alternative fuel system when the vehicle switches to gasoline or when a safety condition requires it. The computer monitors the circuit for expected voltage or continuity and sets this code when the signal does not match the commanded state.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.