What does code U02B4 mean?

Q: What does code U02B4 mean?

Lost Communication With Front Radar Module A. U02B4 means the vehicle's main communication network has lost contact with the front radar module, which is the sensor behind the cruise control and collision-avoidance systems. The computer detected that the module stopped responding to its periodic status messages on the controller area network (CAN) bus, so it flagged the missing node as a communication fault.

DTC codes / U02xx · Lost communication with a control module / U02B4

U02B4Lost Communication With Front Radar Module A

U02B4 means the vehicle's main communication network has lost contact with the front radar module, which is the sensor behind the cruise control and collision-avoidance systems. The computer detected that the module stopped responding to its periodic status messages on the controller area network (CAN) bus, so it flagged the missing node as a communication fault.

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.