What does code U019A mean?

Q: What does code U019A mean?

Lost Communication With Tachograph Module. U019A is a generic network communication code indicating that one or more control modules on the vehicle's Controller Area Network (CAN) bus have stopped receiving messages from the tachograph module. The tachograph module is a dedicated electronic unit that records vehicle speed, distance, driver activity, and engine data for commercial compliance, and when it goes silent the monitoring modules set this code after a defined timeout period.

DTC codes / U01xx · Lost communication with a control module / U019A

U019ALost Communication With Tachograph Module

U019A is a generic network communication code indicating that one or more control modules on the vehicle's Controller Area Network (CAN) bus have stopped receiving messages from the tachograph module. The tachograph module is a dedicated electronic unit that records vehicle speed, distance, driver activity, and engine data for commercial compliance, and when it goes silent the monitoring modules set this code after a defined timeout period.

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.