What does code U0251 mean?

Q: What does code U0251 mean?

Lost Communication With Running Board Control Module B. U0251 is a network communication code indicating that the vehicle's main control modules have lost contact with the Running Board Control Module B, which is the second of two modules that operate the power-deployable running boards on many trucks and SUVs. The computer detected that the module stopped responding to controller area network (CAN) messages or that its periodic status broadcast went missing for a set number of drive cycles.

DTC codes / U02xx · Lost communication with a control module / U0251

U0251Lost Communication With Running Board Control Module B

U0251 is a network communication code indicating that the vehicle's main control modules have lost contact with the Running Board Control Module B, which is the second of two modules that operate the power-deployable running boards on many trucks and SUVs. The computer detected that the module stopped responding to controller area network (CAN) messages or that its periodic status broadcast went missing for a set number of drive cycles.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

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.