Why does the Envision's auto start-stop fail to work?

[LeKathryn]

Buick Envision's engine start-stop failure is subject to many constraints, such as the hood not being locked, faults in the engine module, the water temperature not reaching the specified level, and driving habits. Introduction to Auto Start-Stop: Engine auto start-stop automatically shuts off the engine when the vehicle comes to a temporary stop (e.g., at a red light) during driving. When it's time to move forward again, the system automatically restarts the engine. Its English name is STOP&START, abbreviated as STT. The STT intelligent fuel-saving system is a set of controls for engine start and stop. Function of Auto Start-Stop: The primary role of auto start-stop is not during high-speed driving but when the car is moving at low speeds and repeatedly stopping. It helps automatically shut off the engine to avoid unnecessary fuel consumption and reduces the vehicle's idle time. Less idle time means less engine carbon buildup, which is why this feature was developed.