If the engine doesn't turn over or turns over slowly
Do not push or pull the vehicle to start it. This could cause damage to your vehicle. See instructions for "Jump Starting" provided in this chapter.
CAUTION
Push or pull starting the vehicle may cause the catalytic converter to overload which can lead to damage to the emission control system.
If the engine turns over normally but doesn't start
If the engine still does not start, we recommend that you call an authorized HYUNDAI dealer for assistance.
Hyundai Kona (OS) 2018-2025 Owners Manual: Battery replacement
If the remote key is not working properly, try replacing the battery with a new
one.
Battery Type: CR2032
To replace the battery:
1. Insert a slim tool into the slot and gently pry open the cover.
2. Using a screw driver, remove the battery cover.
3. Remove the old battery and insert a new battery ...
Hyundai Kona (OS) 2018-2025 Service Manual: Smart Key Repair procedures
Smart Key
Smart Key Code Saving
1.
Connect the DLC cable of GDS to the data link connector (16 pins) in
driver side crash pad lower panel, turn the power on GDS.
2.
Select the vehicle model and then do "Smart Key Code ...