Keyless entry is a car access system that lets drivers lock and unlock doors without inserting a metal key, most commonly using a radio-signal fob that works within about 50 feet.
If you’ve pressed a button on a key fob to unlock your car from the driveway, you’ve used remote keyless entry (RKE). Newer systems add passive keyless entry (PKE), where the car unlocks automatically when the fob is near. These systems have become standard on virtually all cars sold in the U.S., and they often pair with push-button start for a fully keyless experience.
How Keyless Entry Systems Actually Work
There are two main types, and most modern cars use one or both.
Remote keyless entry (RKE): The driver presses a button on a dedicated fob, which sends a radio-frequency (RF) signal to a receiver inside the car. The vehicle verifies the signal—using encrypted communication and rolling codes to prevent copying—then locks or unlocks the doors. The typical effective range is about 50 feet, though that can vary with the vehicle and environment.
Passive keyless entry (PKE): The car emits low-frequency “wake-up” signals around the doors. When an authorized fob is close—usually within a few feet—it responds, and the car verifies the key’s identity before unlocking. The unlock may happen automatically on approach, or it may require touching the door handle as a deliberate trigger. Most PKE systems operate at regional frequencies like 315 MHz or 433 MHz.
What You Actually Do To Use Keyless Entry
The daily actions are simple once you know the difference between the two modes.
- For RKE: Press the lock or unlock button on the key fob while you are within the vehicle’s range. The car responds with a visual flash and sometimes a sound.
- For PKE: Keep the fob on your person—in a pocket or bag—and approach the car. If your system requires a deliberate act, touch or pull the door handle. The car will unlock if the fob is authenticated.
- For starting the engine: With push-button start, ensure the fob is inside the cabin (the car verifies its presence) and press the start button. No physical key insertion is needed.
These systems may include a backup manual key hidden inside the fob, which can be used if the battery dies.
Keyless Entry Pros, Security Caveats, and a Common Mistake
Keyless entry is undeniably convenient, but it comes with a few real-world trade-offs. The main security concern is the relay attack: thieves can use a signal booster to trick the car into thinking the fob is nearby when it is actually inside a house. The fob’s battery also needs periodic replacement, and the car’s system draws a small amount of power while listening for signals.
The single most common misunderstanding is thinking “keyless” means no key-shaped device is needed at all. In nearly every case, you still need a fob or smart key on your person. Another frequent mix-up is confusing “keyless entry” (proximity unlock) with “remote keyless entry” (pressing a button from a distance), though many vehicles bundle both.
If you are shopping for an aftermarket upgrade, check out our tested picks for the best auto keyless entry kits to find one that matches your car and budget.
The Bottom-Line: What Keyless Entry Really Is
Keyless entry is a radio-based system that lets you unlock and lock a car without a physical key. The fob communicates with the car using encrypted signals at short range. For RKE, you press a button; for PKE, the car senses the fob and unlocks automatically. Both types have been standard on U.S. cars for years and are usually paired with push-button start. Just remember: you still need that fob, and its battery will eventually need changing.
FAQs
Can someone hack my keyless entry?
Yes, keyless entry systems are vulnerable to relay attacks, where thieves use a device to extend the fob’s signal to the car. You can reduce the risk by storing your fob in a metal box or an RFID-blocking pouch.
Does keyless entry drain the car battery?
Typically no. The car’s systems draw a very small amount of power to “listen” for a key signal, but this is negligible and will not noticeably drain a healthy battery.
Is keyless entry the same as push-to-start?
Not necessarily. Push-button start often ships with keyless entry, but the two are separate features. Some cars have keyless entry with a traditional ignition key, and others have push-button start with a fob that still physically locks and unlocks the doors.
References & Sources
- Wikipedia. “Remote keyless system.” Defines the two main types and operational basics.
- ScienceDirect. “Keyless Entry System – an overview.” Provides technical context on encryption and vehicle modules.