What Causes Car Anti-Theft Authentication Failure?
2 Answers
Engine anti-theft authentication failure occurs when the car key is not detected. This situation mostly arises because the car key's battery is dead or there is an issue with the receiving module. Below is an introduction to the car anti-theft system: Introduction: To enhance anti-theft effectiveness, some cars are equipped with a steering lock. The steering lock is used to secure the car's steering shaft. It is integrated with the ignition lock and installed under the steering wheel, controlled by the key. Specifically, after the ignition lock cuts off the ignition circuit to stop the engine, turning the ignition key to the extreme left position will extend a lock tongue into the steering shaft groove, mechanically locking the steering shaft. Types: A car anti-theft device is installed in the vehicle to increase the difficulty of theft and prolong the time required to steal the car, acting as a guardian for the vehicle. By connecting the anti-theft device to the car's electrical circuit, it can prevent theft, unauthorized access, and protect the car while enabling various anti-theft functions. With advancements in technology, to counter increasingly sophisticated theft methods, various types and structures of anti-theft devices have been developed. These devices can be categorized into four main types: mechanical, chip-based, electronic, and network-based.
Last time my car suddenly displayed an anti-theft authentication failure, which really confused me. This issue is mostly caused by a problem with the key signal—it could be that the key battery is dead, or there's a signal interference source nearby disrupting the communication signal. Another possibility is that the car's computer module failed to recognize the key chip, in which case the system will lock the engine and prevent you from starting it. If you've modified the car key or installed a non-OEM anti-theft device, it can easily conflict with the original system, leading to authentication failure. If you encounter this situation, don't force it—repeated ignition attempts may result in a longer lockout. It's recommended to first try a spare key. If that doesn't work, have a professional technician check the OBD system to read the fault codes, as issues with the anti-theft system are no small matter.
