smart key fob and car don’t link at all.
have you changed the batteries in the fob?
if you have, check your owner’s manual. there might be info on reprograming procedures.
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Kia Key Fob Programming | Kia Key Fob Tricks | Hendrick Kia of Cary
If this does not work, then you have to go to an Automotive Locksmith to program the remote to your vehicle for you.