U1900: CAN Communication Bus Fault
LowNetwork/CommunicationCAN Bus
What does U1900 mean?
U1900 is a diagnostic trouble code indicating "CAN Communication Bus Fault". This code relates to your vehicle's can bus and should be diagnosed to determine the root cause. The severity level helps indicate how urgently this should be addressed.
Common causes
- Faulty can bus component
- Wiring or connector issue in the related circuit
- Failed sensor providing incorrect readings
- Software/calibration issue requiring ECU update
- Related component causing secondary fault
What should you do?
This is a minor or informational code. Monitor for any changes in vehicle behaviour and address it during your next scheduled service visit.
Get a diagnosis for YOUR car
Code U1900 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.