Had the same problem with a 2003 Accord. I checked the ashtray and the glove box for a sticker that has the radio code and serial number. I found mine stuck on the side of the glove box. You may also find it in the user manual. If you are the owner of the vehicle, you can go to this website, https://radio-navicode.honda.com/, and enter the VIN, Zip code and phone number for the registered owner, and get the code electronically sent to you. Hope this helps!