DTC codes / U02xx · Lost communication with a control module / U02BD
U02BD is a generic communication fault indicating that the engine control module or another primary module on the controller area network (CAN) bus has stopped receiving messages from the night vision control module. The computer detects a loss of expected periodic data from that module, often setting the code after a timeout or missing message counter threshold is exceeded.
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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