What does code U0001 mean?

Q: What does code U0001 mean?

Loss of Bus Communication. U0001 is a generic network communication code indicating that a control module has lost the ability to transmit or receive data on the high-speed CAN (Controller Area Network) bus. The computer sets this code when it detects a complete absence of bus activity, often because the bus wiring is shorted, open, or a module is holding the bus down.

DTC codes / U00xx · Network wiring and bus faults / U0001

U0001Loss of Bus Communication

U0001 is a generic network communication code indicating that a control module has lost the ability to transmit or receive data on the high-speed CAN (Controller Area Network) bus. The computer sets this code when it detects a complete absence of bus activity, often because the bus wiring is shorted, open, or a module is holding the bus down.

SystemNetwork

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaNetwork wiring and bus faults

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.