What does code U0003 mean?

High Speed CAN Communication Bus (+) Open: The CAN bus high wire is open — complete communication loss on that bus.

U0003 is rated as critical severity. Stop driving — risk of damage or safety hazard.

U0003

High Speed CAN Communication Bus (+) Open

Network Code · Critical

What does U0003 mean?

The CAN bus high wire is open — complete communication loss on that bus.

System: CAN Bus

U0003 is a network diagnostic trouble code indicating high speed can communication bus (+) open. This code is classified as critical severity, which means: stop driving — risk of damage or safety hazard.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.