P25B6 code meaning
Turbocharger/Supercharger Wastegate B Stuck Closed
Powertrain system Generic code P25xx codes Check engine light
What P25B6 means
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.
P25B6 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 P25B6
- Power limited, sometimes after a short boost spike
- Check engine lamp on, possibly with P0299 or an overboost code
Common causes of P25B6
- Most 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)
- Less likelyActuator B unable to drive the valve 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 P25B6 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. |
| B6 | The exact fault in that area. |
What to do next
- Note P25B6 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 P25B6
What does P25B6 mean?
P25B6 means "Turbocharger/Supercharger Wastegate B Stuck Closed". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P25B6?
Drive gently and only to a workshop. With P25B6 the car can go into limp mode (reduced power) to protect itself.
Will P25B6 fail an emissions test?
Yes, it can. P25B6 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 P25B6 to fix?
Difficulty: hard. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P25B6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.