OBD-II code · Powertrain (generic, extended)
P25B5 Turbocharger/Supercharger Wastegate B Stuck Open
Same as wastegate A stuck open, applied to the second wastegate (twin-turbo, sequential or two-stage). Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
Is it safe to drive with P25B5?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySeized wastegate linkage
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
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
- 1.5–6 h
- Emissions test
- Likely to fail
- Parts involved
- Wastegate B, Turbocharger B
Related codes
- P25B3Turbocharger/Supercharger Wastegate A Stuck Open
- P25B2Fuel Level Sensor A or B Stuck
- P25B4Turbocharger/Supercharger Wastegate A Stuck Closed
- P25B6Turbocharger/Supercharger Wastegate B Stuck Closed
- P25B7Auxiliary Ignition Switch On/Start Position Circuit
- P25B8Auxiliary Ignition Switch On/Start Position Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.