DTC codes / U04xx · Invalid data received from a module / U04BD
The U04BD code indicates that the vehicle's computer network received invalid or missing data from the park lock/pawl control module, which manages the parking lock mechanism. The computer detected a communication fault where the expected data was either corrupted, out of range, or not received within the required time frame.
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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