What does code U025E mean?

DTC codes / U02xx · Lost communication with a control module / U025E

U025ELost Communication With Electronic Brake Booster Control Module A

U025E is a generic network communication code indicating that the primary control module (typically the engine control module or body control module) has lost contact with the electronic brake booster control module 'A' over the vehicle's controller area network (CAN) bus. The computer has detected a lack of expected periodic messages from that module, which is responsible for providing power brake assist and often integrating with stability control and regenerative braking systems.

SystemNetwork

Code typeGeneric (all makes)

SeverityHigh

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.