What does code U007F mean?

Q: What does code U007F mean?

Control Module Communication Bus M Off. U007F indicates that a control module has lost communication on the vehicle's Controller Area Network (CAN) bus designated as 'M', which is a manufacturer-specific communication channel. The module that set this code detected that it can no longer exchange data with other modules on that bus, often due to a wiring fault, a failed module, or a power/ground issue.

DTC codes / U00xx · Network wiring and bus faults / U007F

U007FControl Module Communication Bus M Off

U007F indicates that a control module has lost communication on the vehicle's Controller Area Network (CAN) bus designated as 'M', which is a manufacturer-specific communication channel. The module that set this code detected that it can no longer exchange data with other modules on that bus, often due to a wiring fault, a failed module, or a power/ground issue.

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.