What does code P25BF mean?

Q: What does code P25BF mean?

Alternative Fuel Disable Control Circuit High. P25BF means the powertrain control module (PCM) has detected a high-voltage condition on the alternative fuel disable control circuit, which is the wire the PCM uses to command a shutdown of the alternative fuel system. The PCM expects a specific voltage on that circuit when the disable command is inactive, and a reading above the acceptable threshold tells it the circuit is shorted to power or the control device is not responding as designed.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25BF

P25BFAlternative Fuel Disable Control Circuit High

P25BF means the powertrain control module (PCM) has detected a high-voltage condition on the alternative fuel disable control circuit, which is the wire the PCM uses to command a shutdown of the alternative fuel system. The PCM expects a specific voltage on that circuit when the disable command is inactive, and a reading above the acceptable threshold tells it the circuit is shorted to power or the control device is not responding as designed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.