A general fault on the CAN communication bus.
Informational only. Consult a qualified mechanic.
Check for aftermarket devices on OBD port. Diagnose CAN bus.
The U1900 OBD-II diagnostic trouble code (DTC) indicates: can communication bus fault. This is a high-severity network code that your vehicle's onboard diagnostics system triggers when a general fault on the can communication bus. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
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