In most modern vehicles, it's possible to lock and unlock the doors at a distance because of the installed keyless entry system. The remote-control key of the keyless entry system is a remote transmitter that sends out a radio frequency signal to a receiver in the car. When any command is entered into the key, the signal sent is recognized by the receiver and triggers a response by the car, such as unlocking the car. Thanks to the remote-control key, the unlocking and locking of doors can be performed from afar and with the push of a button, eliminating any need for fiddling around with the physical key. Keep reading on to learn about the different types of keyless entry remote control keys and what to do if yours is giving you any issues.

Types of Keyless Entry Remote-Control Keys

The type of keyless entry system and its respective remote-control key can vary by vehicle. In general, there are four main types.

Basic Keyless Entry Fobs

The basic keyless entry fob only allows you to lock and unlock the vehicle remotely.

Transponder Keys

Transponder keys are equipped with an embedded RFID chip that communicates with the vehicle's immobilizer system. If the chip is not recognized, the engine will not start, preventing unauthorized use.

Smart Key Fobs

Smart key fobs come with additional features besides the ones mentioned above, such as push-button start, remote start, and more.

Universal Key Fobs

Universal key fobs are generic key fobs that are usually offered as replacements. These only have the basic functions and will need to be programmed into your vehicle before they can work.

Common Issues

The following are the most common issues that you might experience with the keyless entry system and the remote-control key. Not all of them are directly a result of any problem with the system or key.

Signal Interference

Nearby electronic devices can interfere with the signal transmitted by the remote-control key and lead to occasional or complete failure of the key.

Battery Drain/Faulty Battery

Key fobs are just like any other electronic device in that they rely on a power source to operate. If it has a drained or faulty battery, it might work intermittently or not at all.

Programming Complications

Changes in the vehicle's settings, such as an ECU reset, battery disconnection, or software updates, can sometimes cause key fob desynchronization, requiring reprogramming to restore proper functionality.

Physical Damage

The key fob can suffer physical damage to both its internal parts and external parts such as the buttons. Depending on the type and location of the damage, you can swap out individual parts or need to get the entire fob replaced.

Water Exposure

Water that gets into the electronic components of the key fob can cause it to short circuit. Your key fob will likely have to be replaced.

How to Choose a Keyless Entry Remote-Control Key

To be assured of the original level of performance, ensure that you're getting a keyless entry remote-control key specific to your vehicle, as they can differ between models and even model years.

Aftermarket or OEM

Original Equipment Manufacturer (OEM) keyless entry remote-control keys are typically made by authorized manufacturers, whereas third-party manufacturers make aftermarket keyless entry remote-control keys.

We recommend investing in OEM keyless entry remote-control keys to return your vehicle to its original level of performance. Because of the more stringent levels of manufacturing, you'll likely get more use out of an OEM replacement. Some manufacturers may not support aftermarket key fobs under warranty, so check your vehicle's warranty terms before purchasing.

Programming and Installation Options

Once you've bought a replacement keyless entry remote-control key, regardless of the source, you will have to get it programmed to work with your vehicle. This can be done in three ways--at a dealer, by yourself, or at a locksmith.

Dealer Programming

If you don't wish to program your newly obtained keyless entry remote-control key yourself, you can usually bring it to the dealer, where a trained professional will be able to do it for you. Depending on the car and entry system, you might only be able to program the key at an authorized dealership.

Self-Programming

If you're up to programming it yourself, you can do so by following the steps below:
1. Have on hand all the keys you wish to program
2. Enter the vehicle and shut the doors
3. Some vehicles allow self-programming by following specific sequences, such as turning the ignition on/off multiple times. Check your owner's manual for exact steps.
4. Press any button on the key fob you wish to program within a window of usually 10 to 30 seconds. If successful, the car should signal by cycling the door locks or the same chime.

Locksmith Programming

You can also get your key fob programmed by bringing it to a locksmith.

Routine Maintenance

By taking good care of your keyless entry remote-control key, you'll be able to prolong its lifespan. Always make sure that the key is clean and dry to prevent any water damage, regularly replace the battery when you notice any drop in the level of performance, and handle it with care to avoid any physical damage that can compromise its function. Reprogramming is usually only necessary if the key fob loses synchronization due to an ECU reset, prolonged battery disconnection, or other major changes to the vehicle's electronic system.

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