What does code U028E mean?

DTC codes / U02xx · Lost communication with a control module / U028E

U028ELost Communication With Active Aerodynamic Feature Control Module B

U028E is a network communication code indicating that the primary control module (typically the engine control module or body control module) has lost the expected controller area network (CAN) messages from the active aerodynamic feature control module B. The computer detects this when the module fails to respond to periodic status requests or when its assigned CAN messages stop arriving within a specified timeout window.

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.