Code result
U02AD
Lost Communication With Turbocharger/Supercharger Boost Control B
High severity
What it means
The vehicle bus reports loss of communication with boost control module B (electric wastegate or VTG actuator). Boost pressure cannot be commanded; the engine reverts to a low-power fallback.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Bus wiring open or shorted
highOne of the most commonly reported causes for this code — check this first.
Module without power or ground
mediumA plausible cause — test and verify before replacing parts.
Module failed
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose U02AD freeNo credit card required