Why does a car start by itself?

[Doris]

Here is a detailed introduction to the reasons why a car starts by itself: 1. Reason: If the starter activates by itself when the car's main power switch is turned on, it is generally due to a damaged ignition lock, which causes an internal short circuit. Other possible causes include issues with the starting circuit. The car's power switch has several positions, typically including lock, off, on, and start. Under normal circumstances, in the off position, only the constant power section has electricity. In the on position, the power supply is normal. In the start position, the starter operates while other devices continue to receive normal power. The start position does not stay engaged for long and should not be held for an extended period. After starting, it returns to the on state. 2. Solution: Replace the ignition lock. For starting circuit issues, address them based on the specific situation.