P25F0Vacuum Pump Control Circuit B Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P25F0 is stored when the pump's B control circuit reads lower than expected, usually because the switched supply or feedback line is shorted to ground or loaded down by a pump motor with an internal short. A short to ground on the supply side often blows the pump fuse, so the pump then stops altogether. No manufacturer documents P25F0 publicly. Ford's hybrid OBD summary uses a lower limit of 250 mV on the monitoring line for the open-type fault P25EE; a low fault on the same circuit would be judged against a comparable voltage window. The difference from P25EE: there the line is simply without voltage, here the module sees a load or a short pulling it down. CARB lists such outputs among the comprehensive components. Braking assist can fade, and P0556 or P050F may follow.
- What you may notice
- Hard brake pedal
- Repeatedly blown vacuum pump fuse
- Warning lamp on
- Likely causes
- LikelyChafed supply or feedback wire shorted to ground
- PossibleInternal short in the vacuum pump motor
- RareWater ingress in the pump connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €650
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.