Since you have a 2011, I'll assume you may have the Jensen all in one unit. If you do, check the following;
You say it quit. Does that mean it did work and then stopped, or has it ever worked?
If you haven't ever used the disc player, there is a shipping screw in the back of the unit that must be removed before a disc will play.
When I got my replacement unit put in, it wasn't removed and I was getting the same error mssg. If that is the case and you feel competent, take the unit out and look in the back. Trace