I lost my Acura radio code, what worked for me was going to https://radiocodevault.com/acura/ they got me my code within minutes Hope it saves some other people some time. Its a real pain to research this stuff online.
This happened with mine too, battery disconnected than it locked up and said CODE. Here is how I solved it: I went to this site https://radiocodevault.com/honda/ and they got me my code in around 30 minutes. Hope it helps some other people out :)