What does code U0284 mean?

Q: What does code U0284 mean?

Lost Communication With Active Grille Air Shutter Module A. U0284 is a generic network communication code indicating that the engine control module (ECM) or another primary controller has lost the controller area network (CAN) signal from the active grille air shutter module A. The computer detected that the expected periodic messages from that module stopped arriving over the communication bus, which can be due to a wiring fault, a failed shutter motor/module, or a power/ground issue at the shutter assembly.

DTC codes / U02xx · Lost communication with a control module / U0284

U0284Lost Communication With Active Grille Air Shutter Module A

U0284 is a generic network communication code indicating that the engine control module (ECM) or another primary controller has lost the controller area network (CAN) signal from the active grille air shutter module A. The computer detected that the expected periodic messages from that module stopped arriving over the communication bus, which can be due to a wiring fault, a failed shutter motor/module, or a power/ground issue at the shutter assembly.

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.