What Causes Vehicle Authentication Failure and Failure to Start?
3 Answers
Vehicle authentication failure and failure to start may be due to engine malfunction, and it is advisable to visit an auto repair shop for maintenance. Related information: Introduction: An engine (Engine) is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. For example, internal combustion engines typically convert chemical energy into mechanical energy. Expansion: Engines are applicable both as power generation devices and can refer to the entire machine including the power unit (e.g., gasoline engines, aircraft engines). The engine was first developed in England, so the concept of the engine also originates from English, with its original meaning referring to "a mechanical device that generates power."
I've experienced this twice. The first time was in an underground garage when the car suddenly wouldn't start, and a key symbol popped up on the dashboard. After struggling for a while, I realized the car key battery was dead. Replacing the coin battery fixed it immediately. The second time was even weirder—I had just installed a wireless phone charger on the center console, and it interfered with the key signal. Moving the charger half a meter away solved the problem. Later, the mechanic told me that if the spare key didn’t work either, it was likely an issue with the antenna coil in the anti-theft system, especially in older cars where wiring tends to degrade over time.
I've previously researched this type of fault. Vehicle anti-theft authentication failures mainly occur at three levels: the key side, the vehicle body side, and the communication environment. The most common issues are a dead key fob battery or internal chip damage—placing the key against the start button might work as a temporary fix. Fault codes in the body control module require a diagnostic tool to check, such as issues with a loose coil receiver. Interference problems are often overlooked, like signal-blocking zones near banks or aftermarket high-power electronic devices. Once, I saw a dealership technician handle a Tesla owner's issue, only to find that the owner's newly purchased metal keychain was blocking the signal.
