P0248 Turbocharger/Supercharger Wastegate Solenoid B Range/Performance

P0248 points to wastegate solenoid B range/performance. Boost response from the B control path does not match the controller command.

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 boost hardware before separating solenoid command, actuator movement, and pressure sensor feedback.

Symptoms of P0248

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 P0248

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

Compare solenoid B command with desired boost, actual boost, actuator response, airflow, engine load, and sensor A or B pressure data.
Inspect solenoid plumbing, vacuum supply, actuator binding, wiring voltage drop, connector condition, and boost leaks.
Check whether the fault appears on one turbocharger, one bank, hot operation, or high-load boost transitions.

Related OBD-II codes

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