What does code P25F1 mean?

Q: What does code P25F1 mean?

Vacuum Pump Control Circuit B High. P25F1 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for vacuum pump 'B', which is typically a secondary electric vacuum pump used for brake assist or emission-related vacuum supply. The PCM commands the pump on or off and monitors the circuit for expected voltage; a high reading means the circuit is seeing voltage above the normal operating range, often due to a short to power, an open ground, or a faulty pump module.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25F1

P25F1Vacuum Pump Control Circuit B High

P25F1 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for vacuum pump 'B', which is typically a secondary electric vacuum pump used for brake assist or emission-related vacuum supply. The PCM commands the pump on or off and monitors the circuit for expected voltage; a high reading means the circuit is seeing voltage above the normal operating range, often due to a short to power, an open ground, or a faulty pump module.

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.