What does code U02B3 mean?

Q: What does code U02B3 mean?

Lost Communication With Driver Monitoring System Module. U02B3 is a generic network communication code indicating that a control module on the vehicle's data bus has lost contact with the Driver Monitoring System (DMS) module. The computer that set the code expected regular status messages from the DMS but stopped receiving them for a defined period, so it flagged the module as missing from the network.

DTC codes / U02xx · Lost communication with a control module / U02B3

U02B3Lost Communication With Driver Monitoring System Module

U02B3 is a generic network communication code indicating that a control module on the vehicle's data bus has lost contact with the Driver Monitoring System (DMS) module. The computer that set the code expected regular status messages from the DMS but stopped receiving them for a defined period, so it flagged the module as missing from the network.

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.