DTC codes / U02xx · Lost communication with a control module / U02A8
U02A8 is a generic communication fault indicating that a control module on the vehicle's network has lost contact with the Engine Sound Control 2 module, which is responsible for generating or shaping engine sound inside the cabin. The computer sets this code when it stops receiving the periodic status messages that the sound control module is programmed to broadcast over the CAN bus.
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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