There could be several reasons for this issue. One possibility is that the volume on your radio is turned down or muted. Another possibility is that the speakers or wiring in your vehicle are damaged. It is also worth checking if the audio source (e.g., AM/FM radio, CD player, auxiliary input) is selected correctly. If none of these solutions work, it may be a problem with the audio circuitry in your radio, and you may need to have it repaired or replaced.