DTC codes / U02xx · Lost communication with a control module / U0217
U0217 is a generic communication fault indicating that a control module on the vehicle's controller area network (CAN) bus has lost contact with the module or sensor designated as 'Door Switch C'. The computer detected that expected periodic messages from that door switch input have stopped arriving within the required time window, which sets the code and usually triggers a warning light or a message on the driver information display.
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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