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To turn off the engine (START/RUN position) or vehicle power (ON position), press the engine start/stop button with the shift lever in the P (Park) position. When you press the engine start/stop button without the shift lever in the P (Park) position, the engine start/stop button will not change to the OFF position but to the ACC position.
In an emergency situation while the vehicle is in motion, you are able to turn the engine off and to the ACC position by pressing the engine start/stop button for more than 2 seconds or 3 times successively within 3 seconds. If the vehicle is still moving, you can restart the engine without depressing the brake pedal by pressing the engine start/stop button with the shift lever in the N (Neutral) position.

Press the engine start/stop button while it is in the OFF position without depressing the brake pedal.
If the engine start/stop button is in the ACC position for more than 1 hour, the button is turned off automatically to prevent battery discharge.
Accessory is displayed on the LCD of the cluster.
Press the engine start/stop button while it is in the ACC position without depressing the brake pedal.
The warning lights can be checked before the engine is started. Do not leave the engine start/stop button in the ON position for an extended period of time. The battery may discharge, because the engine is not running.
To start the engine, depress the brake pedal and press the ENGINE START/STOP button with the shift lever in the P (Park) or the N (Neutral) position. For your safety, start the engine with the shift lever in the P (Park) position.
If you press the engine start/stop button without depressing the brake pedal, the engine will not start and the engine start/stop button changes as follow:
OFF ➔ ACC ➔ ON ➔ OFF or ACC
✽ NOTICE
If you leave the ENGINE START/STOP button in the ACC or ON position for an extended period of time, the battery will discharge.
WARNING - Starting vehicle
Never press the engine start/stop button while the vehicle is in motion except in an emergency. This would result in loss of directional control and braking function, which could cause an accident.
Kia Stinger (CK) 2018-2023 Owner's Manual: How does the air bag system operate?
Air bags are activated (able to inflate if necessary) only when the Engine Start/Stop button is turned to the ON or engine is running. The appropriate air bags inflate instantly in the event of a serious frontal collision or side collision in order to help protect the occupants from serious physical injury. There is no single speed at which the air bags will inflate.Components and components location Components 1. Master cylinder 2. Brake booster 3. Brake reservoir Repair procedures Brake Booster Operating Test For simple checking of the brake booster operation, carry out the following tests. 1. Run the engine for one to two minutes, and then stop it.