Can Other People Unlock My Car Door With Their Remote?

By: Patrick E. George  | 
Your keyfob is a tiny device with a big job — to keep your car from being stolen.
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Keyless entry systems — which use a small radio transmitter built into a keyfob to unlock car doors — are standard equipment on almost every new car.

When you push the button on your keyfob, it transmits a signal to the receiver inside your vehicle tuned to that particular frequency. This triggers the doors to lock or unlock depending on which button you push. The same technology is used to open your automatic garage door at home.


But when you think about it, you're entrusting the safety and security of your automobile to a very tiny and seemingly simple device. Why is it that your keyfob doesn't unlock the door to a similar model car — or even a different car? And what's to stop a thief from using the same signal to get into your vehicle?

­It's not often you hear about cars being stolen using this method. While it's theoretically possible, the technologies used in remote entry systems — like rolling codes and data encryption — make a theft of this nature difficult to pull off. If a thief wanted to steal your car this way, they would have a pretty high-tech mountain to climb.

Next, we'll discuss why you don't have to worry about someone using your vehicle's keyless entry system to make off with your ride.