Powertrain, generic (extended)

P25B5 Turbocharger/Supercharger Wastegate B Stuck Open

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

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.

Likely causes

PCM software needing reprogramming (Ford TSB 23-2353)

Wastegate B linkage loose or disconnected

Actuator B failed or its position sensor reading wrong

Flap of wastegate B seized open

Symptoms

Reduced power, especially when accelerating under load
Check engine lamp and/or wrench indicator on

Repair estimate

DifficultyHardWorkshop job

Parts and labour€100–3,000

Time0.5–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

wastegate bturbocharger b

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.