What does code U05C0 mean?

DTC codes / U05xx · Network communication / U05C0

U05C0Invalid Data Received From Interior Lighting Control Module B

U05C0 means the vehicle's network gateway or a control module expected to receive valid data from the interior lighting control module (the module that runs dome lights, footwell lamps, and other cabin illumination) but the data was missing, corrupted, or flagged as invalid. The computer did not detect a lamp failure directly; it detected that the module responsible for those lamps stopped reporting trustworthy information over the communication bus.

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.