P25EFVacuum Pump Control Circuit B Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P25EF says that the B circuit driving the electric vacuum pump is electrically present but its behaviour does not match the command: the feedback on the switched side looks implausible, or the pump runs without the expected effect on brake vacuum. No manufacturer documents P25EF publicly. Ford's hybrid OBD summary shows the type of logic used on the neighbouring circuit A, where P258B combines an out-of-window monitoring voltage with the relay off and a reading under 250 mV with the relay on. FCA's bulletin S1805000006 ties the A-circuit performance code to pumps that cannot hold enough vacuum and has hoses, check valves, fuses and terminals inspected first. A similar approach suits circuit B. CARB requires plausibility monitoring of such outputs. The brake pedal may feel firmer than usual.
- What you may notice
- Brake pedal firmer than normal
- Vacuum pump running longer or more often
- Warning lamp on
- Likely causes
- LikelyWorn vacuum pump that runs but builds too little vacuum
- PossibleLeaking vacuum hose or faulty check valve
- PossibleCorroded terminals causing an unstable feedback voltage
- 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: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.