What does code U0252 mean?

Q: What does code U0252 mean?

Lost Communication With Lighting Control Module Rear B. U0252 is a network communication code indicating that a primary control module, typically the body control module (BCM), has lost the expected controller area network (CAN) messages from the rear lighting control module, designated 'B'. The computer detected a timeout or missing periodic data from that specific module on the communication bus, not a direct failure of a bulb or wiring to the lamp itself.

DTC codes / U02xx · Lost communication with a control module / U0252

U0252Lost Communication With Lighting Control Module Rear B

U0252 is a network communication code indicating that a primary control module, typically the body control module (BCM), has lost the expected controller area network (CAN) messages from the rear lighting control module, designated 'B'. The computer detected a timeout or missing periodic data from that specific module on the communication bus, not a direct failure of a bulb or wiring to the lamp itself.

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.