Reasons A Car Won’t Detect the Key Fob

The latest car models do not use traditional ignition keys to start the vehicle. With the advance of technology, most cars now have keyless entry systems, consisting of a key fob transmitter and a receiver fitted inside the vehicle. The key fob functions as a short-range radio transmitter that sends coded signals to a receiver in the vehicle. The receiver then performs a specific function such as locking or unlocking the doors or kicking off the engine by pressing the push button.

Car key fobs are very convenient as they eliminate the possibility of locking keys in the car. However, there are times when the vehicle fails to detect signals from the key fob. It is very annoying to see no-key error messages, as it prohibits the user from getting into the car or starting the vehicle using the push-start button. It is not uncommon for the automobile not to receive signals from the key fob, and it is an issue every car owner faces at some time or another. 

Here we discuss a few possible reasons for a car not detecting the key fob:

Dead key fob battery

A bad battery in the key fob is most commonly the reason for a failure to send signals to the keyless entry system. If it is available, use the spare key fob to open the vehicle and start the ignition. 

If the spare fob is not available, use the provided key embedded in the fob to unlock the door. To start the engine, check the owner’s manual for instructions to start your car when the key fob fails.

Using the wrong key

When in a hurry, it is not unusual for vehicle owners to grab the wrong car key. Every key fob is uniquely programmed and will not work on other vehicles. Re-check that the key used belongs to that particular car. 

Faulty or damaged key fob

It is a possibility that the key fob itself is defective. Old or loose wiring, water damage, or programming issues prevent the car from locking and unlocking. Contact a certified locksmith to reprogram the key to the vehicle.  

An issue with the keyless entry system or start button

An antenna or wiring fault in the keyless entry system, software issues, a damaged circuit board, or a faulty start button are all possible culprits. Consider having the vehicle inspected for any repair needs.

Worn out car battery

Sometimes, the problem lies not with the key fob but the car. Modern vehicle systems are demanding and may cause the car battery to become weak or die, preventing it from responding to the key fob. Charge the battery and if it is old and worn-out, consider a replacement. 

Vehicle locks

Issues with the car door locks can also cause problems with the key fob.

Broken contacts or misaligned buttons

Check the key fob for stuck or broken buttons. They interfere with the key fob’s ability to operate efficiently and send correct signals. If you feel comfortable doing so, take the fob apart and make the necessary adjustments. A professional locksmith may also be able to examine the key fob and fix the issue.

Radio interference

Radio interference is a possible cause if the key fobs stop operating all of a sudden. Wireless devices such as radar detectors and anti-theft alarms can interfere with the key fob signals by transmitting at the same frequency. 

Most key fob issues have easy solutions. If the problem is not dead batteries, contact a professional locksmith to fix, replace, or reprogram the key fob or have a duplicate key made to avoid car lockouts.

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