What does code U009B mean?

Q: What does code U009B mean?

Vehicle Communication Bus I. U009B is a generic network communication code indicating that a module on the vehicle's communication bus has reported a fault with the bus itself, often affecting how modules share data. The computer detected an abnormal condition on the bus wiring or a module's ability to transmit and receive signals, which can disrupt multiple electronic systems.

DTC codes / U00xx · Network wiring and bus faults / U009B

U009BVehicle Communication Bus I

U009B is a generic network communication code indicating that a module on the vehicle's communication bus has reported a fault with the bus itself, often affecting how modules share data. The computer detected an abnormal condition on the bus wiring or a module's ability to transmit and receive signals, which can disrupt multiple electronic systems.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

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.