P25F0
Vacuum Pump Control Circuit B Low
Voltage on the secondary vacuum pump control line is below the expected window. Usually a short to ground or a shorted motor winding.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to groundCommon
- Internal short in pump motor windingPossible
Parts involved
- Vacuum Pump B
- Wiring Harness
P25F0 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.