What is a Passive Entry Passive Start (PEPS) System?

Passive entry passive start (PEPS) is a secure wireless communication system that enables a driver to access their car (unlocking the car and starting the engine) without physically using a key. This system uses RF signals for authenticating the key by sending signals between the car and key. This is the technology that powers smart keys.

The PEPS system uses low-frequency (typically 125 kHz or 134 kHz) and ultra-high-frequency (UHF) (typically Sub-1 GHz) signals to exchange unique key access codes between the key and the vehicle. Once the exchanged codes match the expected values and the key is in the vicinity of the car, the car allows access to the driver. This system also measures the distance between the car and the key, determining whether the key is inside or outside the car. This information can be used to give different types of access to the driver. For example, if the key is outside the car then only the entry access will be granted but the start function will not work.