OBD-II code · Powertrain (generic, extended)
P25FB Turbocharger/Supercharger Bypass Valve C Control Circuit Range/Performance
The third bypass valve current does not match the commanded value within tolerance. Drifted coil resistance or high-resistance contact in the connector.
Is it safe to drive with P25FB?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- PossibleCoil resistance changed by thermal stress
- PossibleHigh-resistance contact in the valve connector
- Less likelySensor element aged beyond calibration window
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Bypass Valve C, Bypass Solenoid
Related codes
- P0039Turbocharger/Supercharger Bypass Valve A Control Circuit Range/Performance
- P00C3Turbocharger/Supercharger Bypass Valve B Control Circuit Range/Performance
- P25F8Turbocharger/Supercharger Bypass Valve C Control Circuit
- P25F9Turbocharger/Supercharger Bypass Valve C Control Circuit Low
- P25FATurbocharger/Supercharger Bypass Valve C Control Circuit High
- P25FCTurbocharger/Supercharger Bypass Valve C - Mechanical
- P25FDTurbocharger/Supercharger Bypass Valve C Temperature Too High
- P25FESupercharger Disconnect Clutch
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.