Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / F8
Possible causes
- Open solenoid coil high
- Open or shorted wiring to the valve medium
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–1000 €
- Estimated time: 1–3.5 h
- Component: bypass valve c
- Component: bypass solenoid
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012