What does code U009A mean?

Q: What does code U009A mean?

Vehicle Communication Bus H (-) shorted to Bus H (+). U009A is a generic network communication code indicating that the vehicle's controller area network (CAN) bus line labeled Bus H (-) has been detected as shorted directly to the Bus H (+) line. The module that set this code measured an abnormal lack of differential voltage between the two bus wires, which prevents normal digital messages from being transmitted or received across the network.

DTC codes / U00xx · Network wiring and bus faults / U009A

U009AVehicle Communication Bus H (-) shorted to Bus H (+)

U009A is a generic network communication code indicating that the vehicle's controller area network (CAN) bus line labeled Bus H (-) has been detected as shorted directly to the Bus H (+) line. The module that set this code measured an abnormal lack of differential voltage between the two bus wires, which prevents normal digital messages from being transmitted or received across the network.

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.