What does code P25C2 mean?

Q: What does code P25C2 mean?

Alternative Fuel Disable Signal Circuit High. P25C2 indicates that the powertrain control module (PCM) has detected a high voltage condition on the alternative fuel disable signal circuit, which is used to prevent the engine from running on alternative fuel when conditions are not safe or when the system is commanded off. The PCM expects a specific voltage range on this circuit and sets the code when the signal wire shows voltage above the normal threshold, indicating a short to power or an open circuit.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25C2

P25C2Alternative Fuel Disable Signal Circuit High

P25C2 indicates that the powertrain control module (PCM) has detected a high voltage condition on the alternative fuel disable signal circuit, which is used to prevent the engine from running on alternative fuel when conditions are not safe or when the system is commanded off. The PCM expects a specific voltage range on this circuit and sets the code when the signal wire shows voltage above the normal threshold, indicating a short to power or an open circuit.

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.