Auto DVD Player Doesn't Play Some Music CDs

I just bought a used 2002 Chrysler Town and Country Minivan with a DVD system in it. The DVD doubles as a music player and does play some music CDs fine. When I try any “homemade” ones made off my computer it won’t play them. Other CD players will and even my home DVD players will play them. I just bought two commerically made CDs that now won’t play on it either. What’s the difference here and can I fix it?