OBD-II code · Powertrain (generic, extended)
P25FA Turbocharger/Supercharger Bypass Valve C Control Circuit High
Voltage on the third bypass valve control line is above the expected window. Typical causes are a short to battery or an open solenoid coil.
Is it safe to drive with P25FA?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl wire shorted to a B+ supply
- PossibleOpen solenoid coil
- Less likelyConnector pins corroded - high contact resistance
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, Wiring Harness
Related codes
- P00C2Turbocharger/Supercharger Bypass Valve B Control Circuit High
- P25F7AIR System B Incorrect Flow Detected
- P25F8Turbocharger/Supercharger Bypass Valve C Control Circuit
- P25F9Turbocharger/Supercharger Bypass Valve C Control Circuit Low
- P25FBTurbocharger/Supercharger Bypass Valve C Control Circuit Range/Performance
- P25FCTurbocharger/Supercharger Bypass Valve C - Mechanical
- P25FDTurbocharger/Supercharger Bypass Valve C Temperature Too High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.