P25B5 code meaning
Turbocharger/Supercharger Wastegate B Stuck Open
Powertrain system Generic code P25xx codes Check engine light
What P25B5 means
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.
P25B5 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P25B5
- Reduced power, especially when accelerating under load
- Check engine lamp and/or wrench indicator on
Common causes of P25B5
- PossiblePCM software needing reprogramming (Ford TSB 23-2353)
- PossibleWastegate B linkage loose or disconnected
- PossibleActuator B failed or its position sensor reading wrong
- Less likelyFlap of wastegate B seized open
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wastegate bTurbocharger b
What each part of P25B5 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| B5 | The exact fault in that area. |
What to do next
- Note P25B5 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P25B5
What does P25B5 mean?
P25B5 means "Turbocharger/Supercharger Wastegate B Stuck Open". P25B5 concerns wastegate B, which on twin-turbo V engines belongs to the second turbocharger, normally on the other cylinder bank. It is a generic code, so it means the same on every make.
Is it safe to drive with P25B5?
Drive gently and only to a workshop. With P25B5 the car can go into limp mode (reduced power) to protect itself.
Will P25B5 fail an emissions test?
Yes, it can. P25B5 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P25B5 to fix?
Difficulty: hard. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P25B5 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.