My dad has a 2002 Kia Sedona since it was new. its been a great van but recently the drivers side door locked and would not unlock. to make a long story short we found a spring that was broken on the mechanism, replaced it and it works fine now. I made a video to explain the repair in much better detail than I can do hear.
https://youtu.be/QQ6jXPOVV5Q
What type problem are you having ? If you haven't checked a BCM or know about automotive electronic's , your best bet would be to take your vehicle to a qualified repair shop .
When you see the stereo in the "HOLD" mode, you will want to enter the typical default code for the universe and everything in it.....and that code is 1111
Each button 1 through 4 for the presets on your stereo will get used to enter that code.
press 1 on your presets first
1_ _ _
if you press it twice the first # in the code will go to 2..and so on..keep pressing until it comes back to 1
press 2 on your presets
11_ _
press 3 on your presets
111 _
and so on......................
Hopefully this anyone who was searching for Radio Code for 2002 Kia Sedona helps out!!