OBD-II code · Powertrain (generic, extended)
P25B3 Turbocharger/Supercharger Wastegate A Stuck Open
Wastegate A is mechanically stuck open. Exhaust gas bypasses the turbine even at low load — turbo cannot reach target speed, boost is permanently low and the engine feels asthmatic. Common causes are seized linkage, broken return spring or carbon-locked wastegate flap.
Is it safe to drive with P25B3?
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
- PossibleBroken return spring
- Less likelyCarbon or debris buildup preventing free movement
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 A, Turbocharger A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.