2002 Mustang GT Mach 460 CD stops playing

I have a 2002 GT that when listening to books on CD, stops playing once it reaches track 17, I might get a couple of minutes of track 17, but then it stops. I can advance through the next tracks but there is no sound, and no clock counting. I have tried them in another player, and they work so the problem is with my Mustang. Help. I am going on a 15 hour trip with it and the books help pass the time.