What does code U028B mean?

Q: What does code U028B mean?

Lost Communication With Active Grille Air Shutter Module C. U028B is a generic communication fault that sets when the body control module or another network gateway stops receiving regular controller area network messages from the active grille air shutter module C. The computer has detected a loss of the module's periodic status broadcast rather than a mechanical shutter failure, so the fault points first at the module's power, ground, or network wiring.

DTC codes / U02xx · Lost communication with a control module / U028B

U028BLost Communication With Active Grille Air Shutter Module C

U028B is a generic communication fault that sets when the body control module or another network gateway stops receiving regular controller area network messages from the active grille air shutter module C. The computer has detected a loss of the module's periodic status broadcast rather than a mechanical shutter failure, so the fault points first at the module's power, ground, or network wiring.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

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.