OBD-II code · Powertrain (generic, extended)
P25F8 Turbocharger/Supercharger Bypass Valve C Control Circuit
A third bypass (recirculation or wastegate) valve used in three-stage charging systems is not responding to control commands. Boost balancing across stages can no longer be achieved.
Is it safe to drive with P25F8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen solenoid coil
- PossibleOpen or shorted wiring to the valve
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
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Bypass Valve C, Bypass Solenoid, Wiring Harness
Related codes
- P00C0Turbocharger/Supercharger Bypass Valve B Control Circuit
- P25F5Turbocharger/Supercharger Boost Sensor C Circuit High
- P25F6AIR System B
- P25F7AIR System B Incorrect Flow Detected
- 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
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.