Will Faulty Ignition Switch Cause Car to Turn Off

If your car’s ignition switch is suddenly giving you problems, it can cause the car to turn off. In some cases, the switch might even become stuck in the “on” position, causing the car to stop working altogether.

What is a Faulty Ignition Switch?

A faulty ignition switch can cause car to turn off. This is a common problem on older cars and can be caused by a number of things, such as moisture getting inside the switch or something hitting the switch while it’s in use. If your car turns off randomly, it’s safest to have it checked out by a mechanic.

How to Test for a Faulty Ignition Switch

If you’re experiencing problems with your car turning off, it’s a good idea to test for a faulty ignition switch. This simple test can help you determine if the switch is the source of your car’s issues. Here’s how to do it:

1. Park your car and turn off the engine.

2. Remove the key from the ignition.

3. Insert a voltmeter into the battery connector and touch the positive (red) lead to each post on the voltmeter. See Figure A below for an example of how this should look. FIGURE A
4. Turn on the engine and check to see if the voltage has dropped below 12 volts. If it has, then your ignition switch is likely defective and needs to be replaced. If the voltage stays above 12 volts, then your ignition switch is working properly and there is no need to replace it.

How to Fix a Faulty Ignition Switch

If your car will not start, there is a good chance that the ignition switch is defective. A faulty ignition switch can cause your car to turn off when you try to start it. In most cases, this can be fixed by replacing the switch. Here are instructions on how to do this:

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1) Remove the screws that hold the ignition switch in place. Then gently pull the switch out of the console.
2) If the switch has a cover, remove it. If not, just take a look at the contacts inside the housing and make sure they are all clean and free of debris.
3) Replace the switch if necessary. Reinstall the cover if you used one. Screws should now be installed in opposite positions than before.

What to Do If Your Car Turns Off After Starting it Up

If your car turns off after starting it up, there is a good chance that the ignition switch is defective. You may be able to fix the problem by replacing the switch.


If you’re having trouble starting your car or it’s been giving you problems lately, there might be a faulty ignition switch involved. Although this isn’t always the case, if the switch is bad, it can cause your car to turn off when you try to start it. If this sounds like something that’s happening to you, get it checked out as soon as possible by a mechanic.

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