Hyundai Elantra won't start due to key fob not detected, issue more frequent in the morning on Hyundai Elantra

Some Hyundai Elantra owners report experiencing issues with their key fob not being detected, particularly in the morning. The most common cause cited is a dead battery in the key fob, but other potential issues include worn buttons, poor battery contact, water damage, a defective key fob, receiver module problems, signal interference, a dead 12-volt battery, and the need for reprogramming an unpaired key. When the vehicle fails to start using the push button, replacing the key fob battery is often recommended as a first troubleshooting step. Owners may also find success in resolving the detection issue by resetting the key fob or bypassing the "Key Not Detected" error. If the key fob continues to malfunction after a battery change, reprogramming it through a simple reset procedure may restore functionality. Additionally, colder temperatures and environmental conditions may exacerbate these problems, making it crucial for owners to check the battery and follow troubleshooting steps promptly.