Question about Pioneer DEH-1900MP CD Player

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Error a0 hello i changed my car battery and when i reconnected it the stereo would not play the cd it only said error ao can you please help me?

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Do you have a code that you had to enter to unlock the stereo? Have you tried to reset the stereo? Look in your owner's manual and look for a "RESET" button. If you don't have the manual, you can download one from pioneerelectronics.com.. Hope this helps...

Posted on Aug 30, 2008

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My pioneer car stereo DEH-P77MP won't play cd's anymore. the radio still works, but on the screen it says cd error AO or A0. i was wondering what problem this code relates to? hope you can help,...


This is a common error with these units when they get dusty from putting dirty disks inside the drive. Just go to your local staples and or walmart and get a 5 dollar disk player cleaning kit. It looks like a plain cd but has small fibers that come out of the bottom of the disc that clean the laser as it spins and tries to read it.

May 09, 2011 | Pioneer DEH-P77MP CD Player

1 Answer

Error A0 ...what thats mean...How can I fix it


hi,


  • From page 14 of the owner's manual, the error code AO indicates an "Electrical or Mechanical cause"; they recommend turning the ignition off and then back on, and then toggling from CD to radio and back to CD again.

    If you're still getting the error code, then you can try to check for loose connections yourself (or perhaps a jammed disc?), but you'll probably have to take it to a certified Pioneer Service Center or the dealer where you purchased the unit.
  • good luck!

Feb 15, 2011 | Pioneer DEH-P6800MP CD Player

1 Answer

A0 error canyou fix it?


If you really enjoy the head unit call pioneer, there customer service is great and before you fork out another $300 for a new unit why not hear what they have to offer. Some companies have refurbed units ready to ship, just an option.

Aug 14, 2009 | Pioneer DEH-P7500MP CD Player

1 Answer

Ooood ao on display screen


you probably already solved your problem by now, or you probably have a different stereo, but in case you haven't let me tell you what I just did. you just have to reset you system, to do that you take off the front part and stick a pen in the reset hole. The reset hole is in the lower right corner.

Oct 02, 2008 | JVC KD-S640 CD Player

3 Answers

Error Message AO


I had the same issue, my battery was died due to headlight was ON and later player was showing AO. I am going to reset the unit and see if it will solve my problem.

Mar 09, 2008 | Pioneer DEH-1900MP CD Player

1 Answer

Cd error-ao pioneer deh-77mp


I read a solution on here where you disconnect the wiring harness for 30-60 mins. to release the power stored in the capacitors. It seemed to work for everyone. I don't know if you tried this for this amount of time or not. Also, have you used a cd cleaner disc? You laser eye may be dirty. Also, since you said it was an old, battered car, maybe the vibration is causing the unit to malfunction. Also, if the unit is installed at the incorrect angle in the dash, it can cause a problem. Hope this helps...

Jan 16, 2008 | Pioneer DEH-1900MP CD Player

4 Answers

PIONEER DEH-P7500MP


Ok so I just fixed my problem. Although I was getting the error because of using an iPhone instead of a CD I believe it is the same solution.

As jjgomex suggested it was pulling to much power, to what I did was turn on the headunit switch the source to something other than what causes the problem.

Then go to the Audio settings in the menu and turn bass all the way down and Sub Control to -1.

Then turn off headunit and turn it on again and switch to the source of problem, it should be fixed, or at least it did for me.

:) Good Luck!

Nov 14, 2007 | Pioneer DEH-P7500MP CD Player

2 Answers

DEH-1900MP - lost functionallity after disconect/connect batery


Yes for some radio's if you take away power it has a theft lock and will not let you back in except if you have the code. To reset you must take power away from it. I would suggest if you don't want to take cd player out of car then disconnect battery. then when reconnect eject. May have to set for a moment.

Sep 21, 2007 | Pioneer DEH-1900MP CD Player

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