How Keyless Entry Systems Work and Stay Secure
Last reviewed: 2026 · Driviology Road Safety Education Team
Quick Answer
Keyless entry systems detect a signal from a nearby key fob to unlock the vehicle automatically, and while convenient, they carry a known vulnerability to relay attacks that can be reduced by storing the fob away from exterior walls or in a signal-blocking pouch.
Keyless entry has become common enough that many drivers no longer think about how it actually works, or the small security trade-off that comes with the convenience.
How the System Detects Your Fob
The vehicle continuously listens for a low-power signal from a nearby fob, unlocking automatically once it detects the correct one within range, often working alongside an ignition switch or push-button start.
The Relay Attack Vulnerability
A relay attack captures and extends the fob’s signal from further away than intended, which is a known weakness of this convenience-focused technology.
Reducing the Risk
Storing the fob away from exterior walls and doors, or in a signal-blocking pouch, alongside an immobilizer, meaningfully reduces this specific risk.