What are the reasons why the one-button start button in a vehicle cannot turn off the engine?

[VanMadison]

Reasons why the one-button start button in a vehicle cannot turn off the engine: 1. The key cannot be detected—sometimes nearby strong magnetic fields may cause interference, preventing the key from being detected. The solution is to align the key with the one-button start. 2. Battery issues—the battery may be dead or its voltage may be below 12V. In this case, pressing and holding the button can turn off the engine. 3. Different models have different operations—some models require a long press to turn off the engine, while others require two quick presses (one press turns off the engine, and another cuts off all power). Some models only need a single press to turn off the engine. The one-button start is a feature installed in smart cars, serving as a button device to simplify the ignition process while also allowing engine shutdown. The one-button start can be retrofitted either at the original key lock position or as an independent panel.