What does PEPS mean in cars?

[DiSarah]

PEPS in cars refers to the keyless system, also known as the Passive Entry Passive Start system. The function of the keyless system is simply that when the driver steps into a designated range, the system can recognize the authorized driver and automatically open the door; when leaving the vehicle, the door locks will automatically lock and enter an anti-theft state. The working principle of the keyless system is as follows: 1. Carry the car key to the vicinity of the vehicle (the car key must have power), when pressing the vehicle button or pulling the door handle, the vehicle will receive the ignition or unlock signal and send a signal to the low-frequency antenna. 2. After receiving the signal, the low-frequency antenna will send a low-frequency trigger signal to the car key. 3. The car key receives the low-frequency trigger signal and sends a high-frequency unlock signal. 4. The high-frequency receiver receives the high-frequency unlock signal, and the entire vehicle completes the unlocking or ignition process.

[VonAthena]

I've come across many vehicles equipped with PEPS, which stands for Passive Entry Passive Start system. Its biggest advantage is eliminating the hassle of taking out the key – when you approach the door with the key, the door handle senses it and automatically unlocks. Once inside, there's no need to insert the key; simply press the brake pedal and push the start button to fire up the engine. The system detects the key's position via low-frequency antennas, with roughly seven or eight antennas strategically placed around the vehicle to ensure accurate recognition. Nowadays, this feature comes standard on many mid-to-high-end models. However, it's important to remember not to store the key with your phone, as electromagnetic interference can cause system failure. Also, keep in mind to use the mechanical key as an emergency measure when the key battery runs out.

[AlainaAnn]

I really like the PEPS design; it makes using the car much more convenient. In the past, I had to rummage through my bag for the key before driving, but now, as long as the key is in my pocket or bag, I can simply pull the door handle to unlock the car when I approach it. Starting the car also doesn’t require searching for the key—just press the button next to the steering wheel. The system primarily relies on a sensing chip, which detects the key within a 1.5-meter range to unlock the doors, and pressing the brake pedal inside the car allows for ignition. However, once I left the key in the trunk, and the car automatically locked, leaving me unable to open it—I ended up calling for roadside assistance. I recommend keeping a spare mechanical key in your wallet, so you won’t be delayed in case the smart key runs out of battery.

[MacDonovan]

PEPS systems have now become standard in mid-to-high-end vehicles, and I find their operation quite fascinating. This system consists of a smart key, door handle sensors, a start button, and multiple receiving antennas. Low-frequency antennas are distributed throughout the vehicle's chassis, center console, and trunk area, continuously emitting signals to detect the key's position. Upon receiving signals of a specific frequency, the smart key transmits back an encrypted code, and the vehicle's computer only unlocks or starts the engine after successful verification. Different brands implement this system in varying ways; for example, German cars require a light touch on the door handle sensor area, while Japanese cars involve pressing a button on the door handle. Beyond convenience, this system offers an anti-theft advantage—the engine cannot start if the key is not inside the vehicle.

[VonKing]

When I first bought my car, I was quite curious about how this keyless start function worked. After researching, I learned that PEPS refers to the Passive Entry Passive Start system. It uses radio frequency identification technology to allow the vehicle to automatically recognize the smart key. The specific process is: when the driver approaches the vehicle, the door handle sensor activates to search for the key signal; the key sends back a verification code; and the door unlocks. The same principle applies when starting the car—stepping on the brake and pressing the start button, the system confirms the key is inside the vehicle before ignition. After using it for over a year, the best part is not having to fumble for keys with wet hands on rainy days, and simply touching a specific spot on the door handle to automatically lock when exiting. However, I’d like to remind everyone to replace the key battery regularly, as it usually runs low after about two to three years.