P25B5Turbocharger/Supercharger Wastegate B Stuck Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P25B5 concerns wastegate B, which on twin-turbo V engines belongs to the second turbocharger, normally on the other cylinder bank. The valve remains open beyond what the PCM commands, so this turbo delivers too little boost while the A side may work normally. Ford monitors B separately from A with its own position sensor: more than 20 mm between target and actual for 2.5 s, checked only when the B circuit codes P0247 and P2ABE are absent; the 2024 summary lists it as P0247 with type 72. Ford TSB 23-2353 reprograms the PCM on 3.5 L EcoBoost F-150 (2022–2023) and Expedition/Navigator (2023–2024) for P25B3 to P25B6 and the related position sensor codes; the later SSM 54083 sends technicians back to the pinpoint tests because a real wastegate fault can be behind them. Toyota also names P25B5-72 for the 2022 Tundra V35A.
- What you may notice
- Reduced power, especially when accelerating under load
- Check engine lamp and/or wrench indicator on
- Likely causes
- PossiblePCM software needing reprogramming (Ford TSB 23-2353)
- PossibleWastegate B linkage loose or disconnected
- PossibleActuator B failed or its position sensor reading wrong
- RareFlap of wastegate B seized 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: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.