U02B0
Lost Communication With Turbocharger/Supercharger Boost Control B Position Sensor
The vehicle bus reports loss of communication with the boost control B position sensor. Closed-loop control of the wastegate/VTG actuator on this turbo loses its actual feedback signal.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
Ordered by how often each turns out to be the cause.
- Bus wiring open or shortedCommon
- Module without power or groundPossible
- Module failedPossible
Parts involved
- Boost Control B Position Sensor
- Vehicle Bus Wiring
U02B0 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.