P0250 Turbocharger/Supercharger Wastegate Solenoid B High

P0250 points to wastegate solenoid B circuit high. The B control path is open, shorted to voltage, or above expected range.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace turbocharger components until the high wastegate solenoid B circuit is isolated.

Symptoms of P0250

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0250

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Check solenoid B signal voltage, feed, ground path, open circuits, short-to-voltage faults, connector fit, and resistance.
Inspect wiring near turbocharger heat, actuator connectors, fuse supply, harness clips, and service areas around boost-control hardware.
Compare high circuit events with boost control command, desired boost, actual boost, and related boost sensor codes.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.