What does code U025F mean?

DTC codes / U02xx · Lost communication with a control module / U025F

U025FLost Communication With Electronic Brake Booster Control Module B

U025F sets when the vehicle's network gateway or primary control module stops receiving regular controller area network (CAN) messages from the electronic brake booster control module B, which is the second booster control unit on vehicles that use redundant or split brake-by-wire hardware. The computer has detected a communication timeout rather than a confirmed hydraulic or electrical failure inside the booster itself.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaLost communication with a control module

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.