I have a pioneer deh-p6600 head unit and when I put a disk in it says error 17 and error 12 what does that mean?
Error codes 12 and 17 are for a dirty or scratched disc. First thing to try would be a different disc. If this does not work most higher-end pioneer head units have a software reset button which is not well marked but usually located behind the face plate and you can use a pen or a pin to push this. It needs to be held down for a few seconds and this will reset all of the settings to factory standard. This does mean that you will lose all saved radio stations, clock settings, audio settings etc. If it still wont play any discs after that it will likely need more detailed attention from a technician. Cheers, Dan