One well-known threat is the relay attack. Specialized equipment can relay signals between a vehicle and a compatible key fob located elsewhere, potentially allowing unauthorized access on vulnerable systems. Newer vehicles may include protections such as motion-sensing fobs or technologies designed to provide more secure distance measurements.

Drivers can reduce risk by following their vehicle manufacturer’s security recommendations. Depending on the car, options may include disabling passive keyless entry when it isn’t needed, storing keys away from exterior doors and windows, or using a properly tested signal-blocking pouch. A visible steering-wheel lock can provide another physical layer of protection.

A dead fob battery usually doesn’t mean you’re immediately stranded. Many fobs contain a hidden mechanical key for unlocking the driver’s door, while vehicles often provide a backup method for recognizing a low-battery fob—sometimes by holding it against a designated area or the start button. The exact procedure varies, so checking the owner’s manual is important.

Keyless technology continues evolving, with some manufacturers offering smartphone-based digital keys and other authentication systems. But convenience shouldn’t replace basic security habits. Know your vehicle’s emergency starting procedure, replace the fob battery when warned, keep your software current where applicable, and use additional theft protection when appropriate. That way, you can enjoy keyless convenience while being better prepared when the technology doesn’t work exactly as expected.