What are the reasons for the car key having power but not being detected?

[LeAllie]

Here are the reasons why a car key has power but is not detected: Dead battery: The vehicle's battery is dead, causing the sensor to lose power, which prevents the vehicle from detecting the key's signal. Even if the owner uses the mechanical key to open the door, they cannot start the car and will need to call for a tow or jump-start assistance. Key malfunction: The original battery of a smart key can last about two years, but if the smart key is subjected to severe electromagnetic interference, it may malfunction. Therefore, avoid placing the smart key near electronic devices. Most smart keys have internal circuits that are less resistant to impact, making them prone to damage from severe collisions. Additionally, if a smart key gets wet, the internal circuits may burn out, leading to remote control failure. It is also important not to place the smart key under the windshield or in other high-temperature environments exposed to direct sunlight.