OBD-II code · Powertrain (generic, extended)
P25FC Turbocharger/Supercharger Bypass Valve C - Mechanical
The third bypass valve is mechanically jammed. Solenoid is energised correctly but the valve flap or disc does not move as expected.
Is it safe to drive with P25FC?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyCarbon buildup blocks the valve flap
- PossibleActuator linkage seized by corrosion
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Bypass Valve C, Actuator Linkage
Related codes
- P00C4Turbocharger/Supercharger Bypass Valve B - Mechanical
- P25F9Turbocharger/Supercharger Bypass Valve C Control Circuit Low
- P25FATurbocharger/Supercharger Bypass Valve C Control Circuit High
- P25FBTurbocharger/Supercharger Bypass Valve C Control Circuit Range/Performance
- P25FDTurbocharger/Supercharger Bypass Valve C Temperature Too High
- P25FESupercharger Disconnect Clutch
- P25FFElectrical System Voltage Stabilizer Control Module Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.