Welcome to mp3car
Before we can help you, we need to know the name of the program you're using in your car. Are you using Mediaengine? Mediacar? Frodoplayer?
You may also want to ask in the software section, in the forum related to what software you're using (but don't post the same question in several places).
Hopefully, once we get a bit more information, we can help you with your problem.