What does code U028D mean?

DTC codes / U02xx · Lost communication with a control module / U028D

U028DLost Communication With Active Aerodynamic Feature Control Module A

U028D is a network communication code indicating that the primary control module has lost contact with the Active Aerodynamic Feature Control Module A over the vehicle's Controller Area Network (CAN) bus. The computer has detected that expected periodic messages from this module have stopped arriving, which points to a fault in the module's power, ground, network wiring, or the module itself.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaLost communication with a control module

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