What is the reason for the sudden inability to turn off the engine with one-button start?

[DelGabriel]

The reasons why the car cannot be turned off include the steering wheel being locked, a dead battery, or running out of fuel. Below are detailed explanations and solutions: Steering wheel lock: Solution: Turn the steering wheel forcefully while turning the key. Battery power check: Solution: Generally, replace the battery in time according to the maintenance manual. Failure to start may be due to a drained battery caused by leaving the headlights on for a long time or the battery reaching the end of its lifespan. Generally, replace the battery in time according to the maintenance manual. Fuel check: Solution: Refuel at a gas station. Also, pay attention to the quality of the fuel. There have been cases where a car owner found water and mud in the fuel tank after opening it. Using such fuel will inevitably damage the car.

[VonPaul]

I just encountered this situation a few days ago. The engine kept running after pressing the start button, which was quite scary. The most common cause is the electronic steering column lock getting stuck. If it doesn't return to position when shutting off, it will refuse to cut power. Another possibility is a faulty brake light switch contact, where the system thinks you're still pressing the brake and won't allow shutdown. I later discovered that low key battery can also cause this issue, as the vehicle can't fully power down if it can't detect the key signal. Check if the floor mat is obstructing the brake pedal, and try operating the remote key near the start button. If all else fails, you'll need to disconnect the negative terminal of the battery, but remember to turn off all electrical devices first. Don't delay with this issue - it's best to visit a 4S shop to read the fault codes as soon as possible.

[Cox]

Last month, my car had the same issue, and it was particularly embarrassing at the gas station. The mechanic said it was mainly due to signal interference or a frozen control module, and once it happened because the car key was placed too close to the phone. Key areas to check: oxidation at the brake switch contact points can send wrong signals; low battery in the smart key affects communication; the electronic gear sensor stuck in D mode can prevent the engine from shutting off. Another easily overlooked cause—aftermarket GPS trackers interfering with the factory circuit. That time, replacing the brake switch relay fixed it for me, costing around a hundred bucks. A temporary solution is to shift to P mode and hold the start button for 10 seconds to force a power shutdown.

[AdrianaRose]

My best friend encountered this issue before - the dashboard went completely black while the engine kept running loudly. The auto repair shop diagnosed it as the gear signal failing to return to P position, causing the transmission control module to malfunction. It could also be due to unstable battery voltage preventing the ECU from entering standby mode properly. I warned her never to repeatedly press the start button, as it could easily burn out the control module. The correct procedure is to open the hood, locate the fuse box, and pull out the main engine fuse (usually the yellow 15A one) for emergency power cutoff. This type of failure often accompanies auto start-stop system failure, and you should watch out for potential steering wheel lock malfunction which poses a rollaway risk.