An OBD module for communicating with a vehicle radio/infotainment system. The OBD module includes a controller, a data bus interface that is configured to draw power from and electronically communicate with a vehicle OBD-II data port and a digital interface connector. The OBD module can be formed from two separate components, including a transceiver module and an interface module, that are in communication with each other. The transceiver module can be located remotely from the interface module. The OBD module can include a graphic equalizer to enhance the sound quality of the input source. The OBD module can also be configured to interrupt playback to play a substitute message as is desired.