Car starts on its own?

2006 CHEVROLET IMPALA
189,000 MILES • 3.9L • 6 CYL • 2WD • AUTOMATIC
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JSW029
  • MEMBER
  • 2 POSTS
My car tries to start with no key or no one in it.
Feb 7, 2023 at 11:05 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

That is an odd one. By any chance, does the vehicle have an aftermarket remote starter installed? I've seen them do this. Actually, they have caused fires resulting from this happening.

If you do, you should disconnect the battery when you are not present until we determine the cause.

Now, I don't know how often it happens, but you may have a failing starter relay. The relay is located in the under-hood fuse box. I attached a pic below showing the relay and a 40-amp starter fuse.

Switch the relay with a different one having the same part number to see if that stops the issue. Also, if you would rather remove a fuse than disconnect the battery, the 40 amp starter fuse will prevent the starter from engaging unless there is a short to power from a different circuit.

Let me know about the relay, the remote starter, or anything you can think of that may help me.

Take care,

Joe

See pic below.

Feb 7, 2023 at 12:42 PM
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JSW029
  • MEMBER
  • 2 POSTS
It doesn't have a remote start.
I tested the relay, and it seems to work when I put power on it. I am just going to get another one in the morning just to see if it is the problem.
Feb 7, 2023 at 1:09 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

If the starter is engaging, we are getting power from somewhere, so I think that is a good place to start. Also, if you could record what it does and upload it for me to see/hear, it may help me.

Let me know.

Joe
Feb 8, 2023 at 4:59 AM
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