I was supplied with a card with the code written on it
However, you can try this. It will give you the serial number which your dealer can use to generate a code number
Turn ON the ignition
Turn OFF the radio.
Hold radio presets #1 and #6,
While holding those presets, push the power to turn ON the radio.
Your radio will either toggle between two screens
U#### and L####
OR
Show the 8 digit serial number ########
If it shows U and L screens, ignore the U/L and record all 8 digits
Now you have it ...
Visit
https://radio-navicode.honda.com/ or contact your local HONDA dealer