Itunes burned CDs do not play in car stereo

I decided to burn all my cd's and keep the copy in my car after my brother had his car broken into and his CDs missing. Anyways to get to the point, this cd player worked fine with itunes up until itunes 9, after that all burns from Itunes stopped reading in the car. The car is a 05 Santa Fe with the factory CD player in it. Any and all new non burned discs that I buy from Best Buy will read but once I put them in the comp and create burned copies and mixes, no cd having more than 12 songs, nothing burned from itunes will read anymore. Does anyone know why? is it a glitch in the new program? I checked with the dealership and they said windows burned CDs work fine, but from what we could tell, mac no longer works. This is also the case for toast Titanium 10.0.6/ neither will burn a working CD-R or CD+R anymore that can be read by my car what is wrong with this?? Can anyone help?