A Controller Area Network (CAN) transceiver is disclosed. The CAN transceiver includes a CAN bus interface including CANH and CANL inputs, a TXDC interface, RXDC interface and a CAN bus diagnostics module coupled with the CAN bus interface. The CAN bus diagnostics module is configured to analyze the CAN bus interface to detect and error on the CANH and CANL inputs and send a diagnostics code predefined for the detected error to one of the TXDC interface and the RXDC interface.