Boost pressure is above the target. The driver may notice limited power mode or surges under acceleration.
Likely causes, most common first
- Wastegate stuck closed
- Faulty boost control solenoid
- Split actuator hose
- Faulty boost pressure sensor
Parts usually involved
- Wastegate actuator
- Boost control solenoid
- Vacuum hose
- Boost pressure sensor
Test before you replace
Compare actual and target boost, then check the wastegate movement and control hoses.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.