What does code P25C3 mean?

Q: What does code P25C3 mean?

Alternative Fuel Disable Signal Circuit Low. P25C3 indicates that the powertrain control module has detected a low voltage condition on the alternative fuel disable signal circuit, which is used to shut off alternative fuel delivery when the vehicle switches to gasoline or when a safety condition requires it. The computer expects a specific voltage on this circuit and sees it pulled below the acceptable threshold, so it flags the circuit as low.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25C3

P25C3Alternative Fuel Disable Signal Circuit Low

P25C3 indicates that the powertrain control module has detected a low voltage condition on the alternative fuel disable signal circuit, which is used to shut off alternative fuel delivery when the vehicle switches to gasoline or when a safety condition requires it. The computer expects a specific voltage on this circuit and sees it pulled below the acceptable threshold, so it flags the circuit as low.

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.