What may cause the throttle to enter fail-safe mode?

The throttle itself has no fail-safe function, but the program inside the computer has this function. When the throttle fails, the computer starts the fail-safe function to ensure that the vehicle can drive to the repair shop or repair station. At this time, the engine is not controlled by the driver, and the engine is controlled to run at a certain speed according to computer memory. Prevent the engine from working under abnormal conditions.