What does code U063C mean?

Q: What does code U063C mean?

Lost Communication With Coolant Bypass Valve Actuator B. U063C is a generic network communication code indicating that a control module on the vehicle's Controller Area Network (CAN) bus has lost contact with the coolant bypass valve actuator labeled B. The module that sets this code expects regular status messages from that actuator, and it has detected that those messages have stopped arriving within the required time window.

DTC codes / U06xx · Network communication / U063C

U063CLost Communication With Coolant Bypass Valve Actuator B

U063C is a generic network communication code indicating that a control module on the vehicle's Controller Area Network (CAN) bus has lost contact with the coolant bypass valve actuator labeled B. The module that sets this code expects regular status messages from that actuator, and it has detected that those messages have stopped arriving within the required time window.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

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.