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What Happens If You Take the Car Key out While Driving?

ByMatsumoto Naoki-December 01, 2023

The cars manufactured in the 50’s and 60’s had simpler mechanisms. They did not have so many advanced technological features and the ignition switches had simple functions. You could take the car key out while driving without affecting the engine’s operation. Can you do the same with the modern cars?

What Will Happen If You Take the Car Key out While Driving?

The straight answer is nothing because you cannot remove the key! With time, the structure of the ignition switches has become more and more complex due to security reasons. In modern vehicles, you cannot remove the key with the engine on. Even if you can do it due to some defects, you will lock the steering wheel. As it will happen while the car is still running, an accident seems almost inevitable.

You cannot remove the key out while driving. (Photo: Getty)

If you do it when the ignition switch is turned to the OFF position, the steering wheel will be locked so that it cannot turn and the transmission will be locked to the Park mode. In that condition, you won’t be able to drive the car because the transmission, steering, and engine won’t work in that case. This situation is also dangerous because if the vehicle goes on a lock – down in the middle of a highway or a road with heavy or moderate traffic, an accident is a possible outcome.

Most modern cars use key fobs, not keys. (Photo: Ebay)

If the car features an electrical-based assistance, which may include braking and steering, it will stop working almost immediately. If it functions on a vacuum-based assistance, it will run for a while and keep rotating until it comes to a complete stop. So, if you can take the car key out while driving, an accident is the most probable consequence.

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What Will Happen to a Modern Car?

Many vehicles these days don’t even have an ignition key. The key less ignition is operated by an RFID fob. The fob has to be within a range for the vehicle to run smoothly. The car will run, at least in Park mode, even if the fob gets slightly out of range.

What will happen if you throw it out of the window while driving the car at a high speed? If the engine is running and the transmission is not in the Park mode, the car will not stop running. The vehicle’s central computer system assumes that the key fob is malfunctioning. So, it will not stop the engine for safety reasons.

However, depending on the make and model, shifting the gear into Park will stop the engine in some vehicles. In case of other models, it will halt only when you stop and shut the engine off. The problem is, there will be no way to restart the engine without the key fob within the required range.

Some models have a start/stop button such as Ford SUVs. Pressing that button while the car is still running will switch the engine off if the speed is less than 20mph. the computer system will simply ignore the command if the speed is more than that threshold.

How Long Should You Hold The Key In The Car Ignition?

When starting your car, you typically turn the key in the ignition until the engine starts. Once the engine is running, you can release the key and it will return to the “on” position. You should not continue to hold the key in the “start” position after the engine has started, as this can damage the starter or drain the battery. It’s important to note that some newer cars have keyless ignition systems or push-button starts, in which case you don’t need to turn a physical key in the ignition at all. Instead, you would press the start button once to turn on the car’s electronics, and then press it again to start the engine. The exact process may vary depending on the make and model of your car, so it’s always a good idea to consult the owner’s manual for specific instructions.

If you want to know more information about driving tips to have a daily safe drive, follow us for more daily updated articles. It might help you to gain lots of knowledge about driving safety.

Matsumoto Naoki is senior car blogger at Car From Japan. Having background in mechanical engineering, he has a unique perspective on a lot of new car innovations. Prior to Car From Japan, Matsumoto was Mechanical Design Engineer at Yajima Plant, Subaru Corporation. His articles provide detailed DIY instructions and how-tos to help you get your new car on the road. If you want to save money and feel more confident when working on your cars, you should not ignore Matsumoto’s sharing posts. He presents driving tips and tricks for everyone through easy-following steps and mechanically but friendly writing.

Comments

Marra Harmon14:54 August 02, 2019
Reply

My 96 Grand Marquis lets me turn off the car mid drive. It stays in drive and no power steering but else than that is fine. How bad for the car is it if I turn my car off down a long hill to my house?

Mohd Noor Hashim10:51 June 17, 2019
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Naoki san, thanks a lot for your good and useful information about advanced technology applied to modern cars nowaday. I sincerely love it.

PETER MWANZIA17:18 April 21, 2018
Reply

THIS SO NICE ADVICE FOR THOSE WHO HAVE TO DRIVE,PLZ BE CAREFUL
THAX
PETER

Chemonges Micah04:55 January 24, 2018
Reply

it’s awesome reading your page it has helped me greatly in managing my lunch car

Jamshed ali17:13 April 21, 2018
Reply

Its good information,specifically for vehicle holder to inform from different method

Moses Egau22:55 January 23, 2018
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Good light on use of keys in cars.
Am happy for that continue enlightening us, thanks

Daniel Kilimo Sutter22:51 January 22, 2018
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This is one of the great explanations I have read and wish to read more of this kind. Keep us updated. Thanks.

Michael banach23:29 November 14, 2018
Reply

I can take my key and turn my car off while I’m driving it and take the key out of the ignition and it’s in drive is that legal

Prosper Ncube14:37 January 18, 2018
Reply

the page is just awesome. I am learning a lot