Hyundai Sonata key fob not responding, unable to auto start or lock doors on Hyundai Sonata

Some Hyundai Sonata owners report experiencing issues with their key fob not responding, which can prevent them from auto starting or locking doors. A common cause is a dead battery in the key fob, and replacing it may resolve the issue. However, some owners find that even after a battery replacement, the key fob remains unresponsive, indicating a potential malfunction in the internal electronics or the vehicle's receiver system. Additionally, intermittent key fob functionality may suggest problems with the receiver system itself. Other reported issues include worn buttons, poor battery contact, water damage, signal interference, unpaired keys requiring reprogramming, or defective key fobs and receiver modules. If simple troubleshooting does not rectify the problem, it is recommended that owners seek professional assistance from a Hyundai dealership or certified automotive locksmith for further diagnosis and repairs.