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What does PEPS malfunction mean?

2 Answers

RowanAnn

08/27/25 5:45am

PEPS malfunction refers to the Passive Entry Passive Start system, which has been widely adopted in mid-range and above vehicle models in China. Additional information: 1. How the PEPS module unlocks car doors: (1) When a driver carrying a valid smart key approaches the vehicle, the PEPS module receives a signal to unlock the driver's side door. (2) The PEPS module activates the driver's side door antenna to transmit signals searching for the smart key. If the smart key is within the antenna's transmission range, it will receive the signal. (3) Upon receiving this signal, the smart key sends out an encrypted high-frequency radio signal, which is received by the Remote Function Actuator (RFA). (4) After processing the signal, the RFA transmits the key information to the Body Control Module (BCM) via LIN data bus. If the BCM verifies the key as valid, it activates all four door lock motors to unlock the doors. 2. Causes of PEPS malfunction: The ignition system maintains a certain power delay after vehicle shutdown, which may cause the keyless entry system to send erroneous signals, making the vehicle's computer misinterpret it as a system malfunction.

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VanNora

09/09/25 4:42am

PEPS malfunction refers to a problem with the vehicle's Passive Entry Passive Start system, which means the keyless entry and start function is not working. With years of experience in car repair, I've encountered many such cases. The most common cause is a depleted key fob battery, leading to the system's inability to detect the key signal. Other possibilities include sensors covered with dust or damaged, system software needing an update, or the presence of strong electromagnetic interference nearby. During diagnosis, I first check the key fob battery voltage—if it's below 3 volts, I replace it with a new one. If the issue persists, I use a diagnostic scanner to read error codes. It's recommended that car owners replace the key fob battery every two years, avoid using the system near high-voltage lines, and regular maintenance can prevent 80% of such failures.

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