Q: Truck starting without key in ignition

asked by on October 10, 2016

Over the last year and a half, my Toyota pickup has mysteriously started up with no one in the truck three or four times. It hasn't done this for a few months now and it recently did it again yesterday. The only way we can shut it down when it does this is to stomp on the brake pedal. Got any idea what needs to be replaced or checked?

My car has 15000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. It sounds like you may have a faulty ignition switch that is causing your vehicle to start without the key. I would recommend having your ignition switch inspected and replaced if necessary in order to resolve this issue. Another thing I would recommend checking it for any electrical shorts in your starting system that could cause the vehicle to start on its own. I would also recommend having this issue resolved as soon as possible as many safety issues could result from a vehicle that starts all by itself. Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Engine not turning over

There are many reasons why a car won't start. Everything from a low battery, fuel pressure issues, to ignition system problems, crank and cam sensors, engine timing, etc. Because of all the variables and the limited information, it is very...

I have to tap the gas pedal to get my car started.

This could possibly be an issue with your Manifold Absolute Pressure sensor or MAP sensor. This sensor monitors the pressure inside the engines intake manifold. This pressure changes when the throttle is depressed. Perhaps the sensor is only reading a...

How to disable a rear view camera in Toyota Corolla ?

The rearview camera can be enabled or disabled using the touch screen display. Perform the following steps: Turn on the touch screen display Touch the “Main Menu” button Touch the option “System Setup” Touch the option “Camera Setup” Touch...

Related articles

How Are High-Performance Ignition Systems Different from Standard Ones?
Once Once upon a time, there was only one type of ignition system. It used a distributor, points, a coil, and was subject to significant wear and tear. Then came the electronic ignition, which replaced the points with an electronic...
What Does a Spark Plug Do?
Your Your ignition system is pretty complex, and there are a number of important components that must work with one another to crank the engine and then keep it running. Your spark plugs are among the most important of these,...
What Does a Spark Plug Do?
Your Your ignition system is pretty complex, and there are a number of important components that must work with one another to crank the engine and then keep it running. Your spark plugs are among the most important of these,...