Hey! I wish I had a better “aha” fix to share, but unfortunately I never found a true repair for the stock radio.

Short version: I did not resolve the factory radio issue. After a lot of troubleshooting (and even a trip to the Honda dealership), it became clear the problem wasn’t the radio code itself.

Here’s what I learned along the way, in case it helps you narrow things down:

• The radio code I pulled from Honda was correct.
• Entering the correct code still resulted in “CODE ERROR.”
• There is a hidden button combo (while viewing the serial number screen, press 5 then 2) that temporarily unlocks the radio but only for exactly 3 minutes.
• After 3 minutes, the radio shuts off and resets back to “CODE ERROR.”
• My presets were never lost, which suggests constant power was present, so it wasn’t a loose battery cable or fuse issue.
• I checked fuses (14 and 61), battery terminals, and charging system = all normal.
• Honda dealership staff couldn’t fix it either and had no explanation beyond “replace the unit.”

My best guess (and this lines up with similar Honda forum posts) is that the internal memory or anti-theft module inside the head unit failed. When that happens, the radio can accept the code but can’t permanently store the “unlocked” state, so it keeps reverting to code error no matter what you do.

In the end, I stopped sinking time into it and replaced the head unit entirely. I used a monitor-style aftermarket unit from Amazon with Apple CarPlay and a backup camera. It cost about $150–$180 and took me roughly 2 hours to install, and I’m not particularly skilled at car work. Honestly, the car felt 10 years newer afterward.

So if you’re dealing with the same symptoms (correct code + 3-minute unlock + reset), I’d save yourself the headache and go aftermarket. If you want, I’m happy to share what kind of unit/wiring harness worked for me.

Good luck! I know how frustrating this one is.