P25F1 code meaning
Vacuum Pump Control Circuit B High
Powertrain system Generic code P25xx codes Check engine light
What P25F1 means
P25F1 marks a high reading on the vacuum pump's second (B) control circuit: the module sees voltage on the switched side when it should be low, for example because the line is shorted to battery voltage, the relay contacts have welded together or the pump has lost its ground. In the welded-relay case the pump keeps running after it has been switched off, which wears it out and drains the battery. No manufacturer documents P25F1 publicly. Ford's hybrid summary checks the comparable circuit A against a 1.3 to 5.0 V window with the relay open, a pattern that would also catch a supply that is stuck on. CARB 13 CCR 1968.2 requires electrical outputs to be checked for circuit faults. The opposite fault is P25F0, and P25EE is the open circuit. Drivers may hear the pump running constantly.
P25F1 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P25F1
- Vacuum pump running constantly, even with the vehicle switched off
- Discharged 12 V battery
- Warning lamp on
Common causes of P25F1
- Most likelyPump relay contacts welded closed
- PossibleFeedback or supply line shorted to battery voltage
- Less likelyLost ground connection at the pump
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Vacuum pumpPump relayWiring harness
What each part of P25F1 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| F1 | The exact fault in that area. |
What to do next
- Note P25F1 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P25F1
What does P25F1 mean?
P25F1 means "Vacuum Pump Control Circuit B High". P25F1 marks a high reading on the vacuum pump's second (B) control circuit: the module sees voltage on the switched side when it should be low, for example because the line is shorted to battery voltage, the relay contacts have welded together or the pump has lost its ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P25F1?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P25F1 fail an emissions test?
Yes, it can. P25F1 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P25F1 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P25F1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.