P25B6Turbocharger/Supercharger Wastegate B Stuck Closed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P25B6 the second wastegate refuses to open when commanded, so turbo B cannot be regulated down and may push boost beyond the target; the module then usually caps torque. Ford detects it with the B-side position comparison (over 20 mm for 2.5 s, no P0247 or P2ABE present) and in 2024 files it as P0247 with type 73. A Ford case shows that loose hardware can trigger the closed-side codes too: TSB 24-2112 for the 2021–2023 Bronco with 2.7 L or 3.0 L engines lists P25B4, P25B6 and P0299 together and traces them to a loose nut on the turbo actuator arm, which leaves the valve out of its intended position and causes underboost. The same PCM update and later pinpoint advice as for P25B5 apply to 3.5 L EcoBoost trucks (TSB 23-2353, SSM 54083). Toyota lists P25B6-73 for the 2022 Tundra V35A.
- What you may notice
- Power limited, sometimes after a short boost spike
- Check engine lamp on, possibly with P0299 or an overboost code
- Likely causes
- LikelyLoose nut on the turbo actuator arm (Ford Bronco TSB 24-2112)
- PossibleWastegate B flap or spindle seized shut
- PossiblePCM software needing reprogramming (Ford TSB 23-2353)
- RareActuator B unable to drive the valve open
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.