Unfortunately most car stereo cannot play dvd, or for that matter jukebox dvd disc.
If you think your car stereo or deck should be able to play it, find out the model and manufacturer and visit their website. They usually have a feature listing of what formats are accepted.
There should be some kind of error displayed when you pop in the disc as well. This could lead you too what’s causing the issue. Might be a format problem, or a disc read error.
I wouldn’t use dvd’s to burn music too if you plan on listening to it.