Boost pressure is below the target. The driver may notice weak power, especially when accelerating, and possibly limited power mode.
Likely causes, most common first
- Boost leak in a hose or intercooler
- Faulty wastegate or actuator
- Worn turbo
- Blocked air filter or exhaust restriction
Parts usually involved
- Turbo hoses
- Intercooler
- Wastegate actuator
- Turbocharger
Test before you replace
Pressure test the intake side for boost leaks and compare actual boost with target before condemning the turbo.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.