My cd player in my ion reads a cd but will not play it, it just spits it out. is there a reset button on the back or something?

If you are using CD-R (cd's you burned yourself) you have to burn them at a slower speed. most cd's are around 40x burn them at a slower speed such as 10x or 8x since car cd players back then were not designed to read CD's at speeds that car CD players read today. I tested this on my 97 saturn. it will not play CD-R at 40x but it will read them perfectly CD-R's that are burned at slower speeds

Two things you might have a bad cd or the cd player have mechanical failure