Powertrain, generic (extended)

P25B3 Turbocharger/Supercharger Wastegate A Stuck Open

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P25B3 says the wastegate of turbocharger A stays further open than the module commands, so exhaust bypasses the turbine and boost falls short. On Ford EcoBoost engines with an electric wastegate actuator and position sensor, the PCM compares commanded and measured position; a gap above 20 mm held for 2.5 s sets the code, provided no circuit fault (P0243, P2ABD) is present. The 2024 summary reports it as P0243 with failure type 72. Ford bulletins SSM 49427 and 50171 cover 2.0/2.3 L EcoBoost models from 2019 (Edge, Escape, Ranger, Explorer, Bronco Sport and others) with a missing e-clip, a dead actuator or a damaged actuator rod; a service kit replaces actuator, rod and clips without a new turbocharger. Toyota lists P25B3-72 on the 2022 Tundra V35A and released new ECM software for it on the 2023 GR Corolla. Expect lack of power.

Likely causes

Missing retaining clip disconnecting actuator rod from the wastegate lever

Electric wastegate actuator failed or rod bent

Wastegate flap or bushing seized in the open position by heat or carbon

Diagnostic calibration needing an update (Toyota GR Corolla)

Symptoms

Clearly reduced power and slow boost build-up
Check engine lamp on, often with an underboost code
Wrench or reduced power warning on some models

Repair estimate

DifficultyHardWorkshop job

Parts and labour€250–3,000

Time1.5–8 h

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

Parts involved

wastegate aturbocharger a

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