What does code U0274 mean?

Q: What does code U0274 mean?

Lost Communication With Lighting Driver Control Module B. U0274 is a network communication fault indicating that the main control module has lost contact with Lighting Driver Control Module B, a dedicated electronic unit that manages one group of exterior lights. The computer detected that messages expected from this module over the vehicle's communication bus have stopped arriving within the required time window, so it flags the module as offline.

DTC codes / U02xx · Lost communication with a control module / U0274

U0274Lost Communication With Lighting Driver Control Module B

U0274 is a network communication fault indicating that the main control module has lost contact with Lighting Driver Control Module B, a dedicated electronic unit that manages one group of exterior lights. The computer detected that messages expected from this module over the vehicle's communication bus have stopped arriving within the required time window, so it flags the module as offline.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.