What does code U054B mean?

DTC codes / U05xx · Network communication / U054B

U054BInvalid Data Received From Interior Lighting Control Module A

U054B is a communication fault indicating that a control module on the vehicle's network received invalid or corrupted data from the interior lighting control module designated as 'A'. The module monitoring the network expected a valid data message from the lighting module but instead saw missing, out-of-range, or implausible information, so it flagged the signal as invalid rather than simply absent.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaNetwork communication

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.