Q: The car starts by itself!!!!

asked by on

Have found the car running twice now with doors locked ,no key in ignition and ignition in off position. Car inly cut off after hitting brake pedal

My car has 170000 miles.
My car has an automatic transmission.

Hi there. In order for an engine to start, the ignition relay needs to send an electric signal to activate the fuel system, ignition system and eventually the starter to crank the motor. This happens in three possible ways. First, you insert the key into ignition and turn the key. Second, you have a remote starter that activates this process. Third, an exposed wire on the ignition relay shorts out and completes this process. If you’re sure that you don’t have a remote starter and that someone is ’playing a prank on you’, or possibly has a similar vehicle near your home with an identical remote frequency (highly unlikely), then the only possible explanation (besides a ghost) would be the exposed wire. You might want to have a professional mechanic complete an electrical problems inspection.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. The car starts by itself!!!!

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

Q: cold start issues

Hi Jim. The poor cold start may be related to a faulty/dirty IAC (idle air control) valve not allowing engine RPM (revolutions per minute) to increase with ambient temperatures below 30 degrees. Assuming the check engine light is on, accessing...

Q: Car makes a loud sound every time I start my car, at idle, and when driving at low speeds

Hello. The first thing to check would be your fluid levels. I'm not sure what type of noise you have, but ticking noises at idle can be linked to a low oil level. If there is a vacuum leak, the...

Q: car will not start/ starter checked out good had ecm changed1 1/2 years ago check engine soon light came on the next day wouldnt

If the Check Engine Light is on, I recommend that you request a check engine light diagnostic. That diagnostic will very likely lead to a resolution of your no start condition. If the starter motor is, in fact, good (stater...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...