DTC codes / U05xx · Network communication / U054A
U054A is a communication fault where a control module on the vehicle's network receives data from the rear entertainment control module (module B) that it considers invalid or corrupted. The receiving module has detected that the messages from the rear entertainment control module are missing expected values, out of range, or otherwise unusable, so it sets this code and may disable features that depend on that data.
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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