U0001 High speed CAN communication bus
- System
- Network - modules not talking to each other
This is a standard code. It means the same thing on every make of vehicle.
What OBD2 FaultFinder shows for U00xx codes
When the program cannot get an answer, its connection diagnostics say which it saw: Bus alive with no answer to that request, No response from the vehicle, or No protocol agreed. The Adapter traffic screen shows every request and reply, and the Full scan records the Protocol and Adapter in use. The Trouble Codes tabs show ? rather than a count when a mode did not answer.