What to Do When the Key Symbol Appears on the Vehicle?
3 Answers
Solutions for the key symbol appearing on the vehicle: When the key symbol is displayed on the vehicle, it indicates that the vehicle cannot detect the car key. This could be due to a malfunction in the vehicle's receiving module, a failure in the key's transmitting module, or simply a dead battery in the key. In such cases, it is necessary to promptly replace the vehicle's receiving module, replace the key's transmitting module, or change the key's battery. The car's smart keyless entry system utilizes RFID radio frequency technology and a vehicle identity code recognition system. It pioneers the development of a compact, low-power RF antenna solution and successfully integrates remote control and keyless systems while maintaining traditional vehicle circuit protection. This truly achieves a dual RF system and dual anti-theft protection, providing convenience and security for car owners.
Last month, while I was driving, the dashboard suddenly lit up with a key symbol, which startled me. I thought the key battery was dead, so I tried the spare key, but it still didn’t work. It turned out to be due to strong magnetic interference nearby. Later, I drove the car to an open area and restarted it, and the problem was resolved. I usually recommend developing a habit of regularly checking the key battery—most cars use a CR2032 coin cell, and replacing it once a year can prevent this issue. If the symbol stays lit, don’t force-start the car, as it can damage the circuits. It’s also a good idea to carry a spare key when going out, and use manual unlocking in emergencies. Getting the antenna system checked at a 4S shop isn’t a bad idea either—they can pinpoint the issue with professional scanning equipment.
I usually enjoy tinkering with car electronic systems. The key light indicator is often caused by signal loss, such as when the key battery is low or the antenna sensor malfunctions. I've tried placing the key close to the start button, which sometimes temporarily wakes it up. Interference sources are also common—having a phone or wireless device too close can cause issues. Replacing the battery yourself isn't difficult, but make sure not to use the wrong model; if it doesn't work, the chip might be damaged. I recommend using a diagnostic tool to read the fault codes—OBD tools are available for just a few dozen bucks on the market. For prevention, keep the key dry and avoid water contact, and regularly clean the contacts to prevent oxidation.
