Quick TakeawayIt's uncommon, but a car that keeps running after you try to shut it off is a genuine electrical fault worth understanding and addressing promptly.
Introduction
It's an uncommon but genuinely disconcerting experience — pressing the button or turning the key to shut off the engine, and the car simply keeps running. While rare, this points toward a specific electrical fault worth understanding.
Why This Happens in Newer Push-Button Start Vehicles
In vehicles with push-button start, the ignition system relies on an electronic signal rather than a direct mechanical connection, and a fault in this system — a stuck relay or a software-related issue — can in rare cases fail to properly cut power to the engine when requested.
A Stuck Ignition Relay in Older Systems
In more traditional key-based ignition systems, a mechanically stuck ignition relay can similarly fail to interrupt power to the engine's ignition system when the key is turned to off, allowing the engine to keep running.
What to Do If This Happens
If the engine won't shut off through the normal method, putting the transmission in park (or neutral for a manual), applying the parking brake, and if the vehicle has a genuine emergency shutoff method described in the owner's manual, using that as the immediate response is the safest approach — this is a situation calling for prompt professional attention rather than continued driving.
Why This Needs Prompt Attention
Given both the rarity and the nature of the fault, having this diagnosed and repaired promptly rather than treating it as a one-off inconvenience is important — a fault in this system could recur or worsen unpredictably.
Frequently Asked Questions
Is this a common problem? No — it's genuinely rare, but when it happens, it reflects a real fault in the ignition system that needs proper diagnosis.