2004 honda odessey radio code

Question edited for clarity and spelling of odessey > Odyssey.
P1456 is a nice one :>)

https://www.google.com/search?q=04+honda+odyssey+brake+code

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During the recall work, the battery was probably disconnected. This will cause the security feature of the radio to disable it until the activation code is inserted. This code was given to you at the time of purchase by the dealer. If you don;t have, the dealer can supply it, The dealer should have ensured that the radio was working prior to your picking the vehicle up after the recall work, but these issues are often overlooked.

Dead Battery

I would think you checked that before
coming here

The code is usually on a sticker on the side of your radio or the side of the glove box. sOME TIMES THEY WILL PUT ONE OF THE STICKERS IN YOUR OWNERS MANUAL ALSO
Good Luck

just change the fuse, it experience a short, try also cliking ten ( 10) times on off the ijnition switch to restart the computer box,

Use this link:

https://radio-navicode.honda.com/

Try pressing the preset buttons numbers 1 and 6 and the same time and then turn the radio on. You will get two sets of 4 digit numbers(radio unit serial numbers). With those numbers, call the dealership and they should give you the radio code.

you will need the radios serial number which is located on top of the unit itself. Then take that number and any Honda dealer will be able to give you the new code. Sometimes it is on a sticker with your owners manual. i am still a tech and we run into this all of the time on Hondas.

I went to my honda dealer and while the car was off the service rep pushed 2 buttons and the serial # displayed on the radio. He then looked up the serial # on the computer and gave me my code. Took 5 mins and he charged me nothing. I think the 2 buttons he pushed were the 1 and 6

p0505 is directly related to the idle air control valve (sometimes called the rotary valve) i cant count how many of these i have replaced on hondas. It is located directly under the throttle body so it can be difficult to replace. I would recommend you having a professional replace this due to the difficulty of the valve removal