P0248: Turbocharger/Supercharger Wastegate Actuator B Range/Performance — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Turbocharger/Supercharger Wastegate Actuator B Range/Performance. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Powertrain
Symptoms
- Check Engine light illumination
- Noticeable loss of engine power
- Reduced turbocharger boost pressure
- Engine entering limp mode
- Increased fuel consumption
Possible causes
- Faulty turbocharger wastegate actuator
- Damaged or leaking vacuum lines
- Electrical wiring harness damage
- Corroded or loose electrical connectors
- Wastegate valve stuck mechanically
- Faulty boost pressure control solenoid
What to check
- Inspect all vacuum lines for cracks or disconnections
- Verify the electrical connector and wiring for signs of corrosion
- Test the wastegate actuator diaphragm for vacuum leaks
- Check the mechanical movement of the wastegate linkage
- Perform a multimeter test on the actuator circuit for resistance and voltage
- Monitor live boost pressure data using a diagnostic scan tool
Also written as: P0248-00, P024800, PO248 (some scan tools add the fault-type byte, e.g. -00).