What does code U0678 mean?

Q: What does code U0678 mean?

Lost Communication With Fuel Level Sensor C. U0678 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 fuel level sensor designated as 'C'. The computer detected that expected data messages from that sensor stopped arriving within the required time window, which can be caused by a wiring fault, a failed sensor, or a module communication issue.

DTC codes / U06xx · Network communication / U0678

U0678Lost Communication With Fuel Level Sensor C

U0678 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 fuel level sensor designated as 'C'. The computer detected that expected data messages from that sensor stopped arriving within the required time window, which can be caused by a wiring fault, a failed sensor, or a module communication issue.

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.