The mechanical key is in the ignition switch.
Exceeding the operating distance limit (approximately 10 m [30 ft.])
The battery in the key is weak.
Other vehicles or objects may be blocking the signal.
The weather is extremely cold.
The key is close to a radio transmitter, such as a radio station or an airport which can interfere with normal operation of the remote key.

Notice

After pressing the lock/unlock button (1, 2) on the key, the hazard warning lights will blink.
After pressing unlock button (2), the doors will lock automatically unless you open any door within 30 seconds.
Press and hold the tailgate unlock button (3) to unlock the tailgate. The tailgate will lock automatically once the tailgate is opened and closed.
If any door, bonnet or tailgate remains open, the hazard warning lights will not blink.

Warning

Never leave the keys in your vehicle

Leaving children unattended in a vehicle with the keys is dangerous even if the vehicle is ACC or ON position.

Unattended children could place the key in the ignition switch or press the ENGINE START/STOP button and may operate power windows or other controls, or even make the vehicle move, which could result in SERIOUS BODILY INJURY OR EVEN DEATH. Never leave the keys in your vehicle with unsupervised children, when the engine is running.
Kia recommends to use parts for replacement from an authorised Kia dealer/service partner. If an aftermarket key is used, the vehicle may not return to ON after START. If this happens, the starter will continue to operate causing damage to the starter motor and possible fire due to excessive current in the wiring.

Caution

Do not fold the key without pressing the release button. This may damage the key.

Notice

Keep the remote key away from water or any liquid and fire. If the inside of the remote key gets damp (due to drinks or moisture), or is heated, internal circuit may malfunction, excluding the car from the warranty.
Avoid dropping or throwing the remote key.
Protect the remote key from extreme temperatures.
When the remote key does not work correctly, open and close the door with the mechanical key. If you have a problem with the remote key, Kia recommends to contact an authorised Kia dealer/service partner.
If the remote key is in close proximity to your cellular phone or smartphone, the signal from the transmitter could be blocked by normal operation of your cellular phone or smartphone. This is especially important when the phone is active such as making call, receiving calls, text messaging, and/or sending/receiving emails.
Avoid placing the remote key and your cellular phone or smartphone in the same pants or jacket pocket and maintain adequate distance between the two devices.
Don’t place key on and around the dash board speaker, as this might interfere with normal operation of smart key.