What does code U0009 mean?

High Speed CAN Communication Bus (-) Shorted to Bus (+): The CAN bus low and high wires are shorted together.

U0009 is rated as critical severity. Stop driving — risk of damage or safety hazard.

U0009

High Speed CAN Communication Bus (-) Shorted to Bus (+)

Network Code · Critical

What does U0009 mean?

The CAN bus low and high wires are shorted together.

System: CAN Bus

U0009 is a network diagnostic trouble code indicating high speed can communication bus (-) shorted to bus (+). 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.