DTC codes / U02xx · Lost communication with a control module / U0227
U0227 is a generic communication fault that sets when the Body Control Module (BCM) or another network controller stops receiving valid Controller Area Network (CAN) messages from the door window motor on circuit F. The computer has detected a loss of the periodic status signal that the window motor normally broadcasts, not necessarily a dead motor.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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