Hello, Im new here. And for the following reason.

I've looked all over the web, but no help.
So the cat started having an issue were once you remove the key it starts back up. And by that I mean at any given time it seems. It starts rigjt after you remove the key, and sometimes minutes later. I wouldof thought the immobilizer would stop it from.soing so, but it still starts and runa by itself.

What have I done to "fix" it?
-replaced the ifnition switch twice. That didnt do anything.
-replaced ignition housing(from a junked cobalt) nothing.

I'm lost on what to do now.

 

Welcome to the site, let’s start with basics, what are the codes if any, just the code itself.
have you tightened those 4 bolts in the under hood fuse box?
are all the fuses and relays pushed firmly into their places in both the under hood and interior fuse panels?

 

I checked both boxes, tight as they should be. I havent messed with them before the issue or after the issue started. No codes either. Aftwr writing the post. The car will not start, but will still try to start. I'd like to add, that after replacing the ignition housing yesterday, I took a 1 hour trip with, where I turned the car on and off multiple times, 6 to be exact and didn't have an issue until today.

 

You are not registering rpm. Crank sensor needs looking at.

 

The car starts fine, and runs smooth. I think the starter just went out from starting over and over. Would a bad crank sensor cause to start, even with the key away from the car?

 

What year is the car? How many owners? Did any of them install after market remote start or fobs or theft alarm?
Is there a fob laying around where it could get pressed on, like between seat cushions or in your pocket? Have you disabled remote start in the DIC? Is this new behavior? What was done just before it started? Is there any after market equipment installed? Did you get the ignition recall parts? Does? it start after the doors are locked
Link to free Owner Manual in my sig.

 

Its a 2011 2.4l, one key one fob. I bought it used 6 years ago. Not sure about how many previous owners. Did not come with remote start, from factory or aftermarket that I'm awware of. It does have a fob, but again no remote start(AP3 code). Not sure about disabled remote start in DIC, I'll look into that. Yes this is new behaviour, did not have a single issue, or engine codes in the time I've had it. I did install a new radio 6 months ago, thats the only thing I have added since. The recall was taken care off before I bought the car. Not sure if it starts with the doors locked. For reference, it just started as I was typing this, the key is on the passengers seat, the ignition is in the "off" position.

 

Did this start shortly after the radio install? What modules did you use for the radio?
If there is an option in the personalization menu to enable/disable remote start it has remote start from the factory. AP3 does not mean the same thing in 2011.
In order to start the BCM needs to send several messages to the ECM then the ECM needs to send a signal to the starter relay and the run/start relay. The key only sends a "start" signal to the BCM.
My guess is that somehow the wiring to the Retained Accessory Power relay got messed with and is now sending a start signal when it is shutting things like the radio down. If the radio was installed by blindly splicing wires, this is a good possibility.

 

No, because the radio in the car I raplaced was aftermarket, and was installed 2 years ago.the one I installed 6 months ago was an upgrade. But I did not splice any wires, I had a harness kit that was plug and play. It came with all the necessary connetions. Where would I find the "personalization menu"? I will take a look at the tadio connections tomorrow, but not sure I'll come up with aything. The issue started just randomly, after years of working without a single issue.

 

The Owner Manual has all of the instructions. Link in my sig for free digital copy.