Trunk Opening when Starting - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 16 (permalink) Old 03-31-2014, 06:55 PM Thread Starter
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Trunk Opening when Starting

I have a 07 LT and recently I have noticed randomly when I start the car the trunk opens up. I have also noticed the key fob doesn't always work each time too. Both happen seemingly randomly from what I can tell, I'm not exactly good with cars to start off with though. From a quick google search I found some cars with weird things like that with a battery that is close to going bad...not sure if that is where I should start or not. any help would be great and appreciated.
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post #2 of 16 (permalink) Old 03-31-2014, 08:15 PM
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I would start by getting your FOB repaired.

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post #3 of 16 (permalink) Old 03-31-2014, 08:37 PM Thread Starter
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Quote:
Originally Posted by Coby7 View Post
I would start by getting your FOB repaired.
I replaced the battery (on the FOB previously) and it seems to be somewhat better but still happening...would I get it done at the dealer or just a local autozone able to look at it? Or something I can do on my own?
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post #4 of 16 (permalink) Old 04-01-2014, 03:48 AM
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Over time these FOBs go bad, just like any part, so probably time to get yours replaced. For my daughter's 06 LS we installed a remote starter which supplied two new FOBs so for little more than the FOB we enhanced her winter climate abilities...just a thought.

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post #5 of 16 (permalink) Old 04-01-2014, 04:15 AM
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Quote:
Originally Posted by ma1r1k2us View Post
I replaced the battery (on the FOB previously) and it seems to be somewhat better but still happening...would I get it done at the dealer or just a local autozone able to look at it? Or something I can do on my own?
The dealer will try to sell you one and they will charge $60 to program it.

They are simple to repair if you have the proper tools. I repair about a dozen a day. Here's the how to I made for FOB repair.

https://www.yourcobalt.com/forums/ele...r-key-fob.html

If you are not highly skilled at this stuff you can PM me I will guide, help you or repair for you as good as new. A repair is less costly because you avoid programming fees.

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post #6 of 16 (permalink) Old 04-01-2014, 08:53 AM Thread Starter
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thanks for the help I will give it a try later tonight...I have 2 so if I mess up to badly I have a back-up
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post #7 of 16 (permalink) Old 04-01-2014, 09:53 AM
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So when you crank the engine, the trunk opens?

Here is what you can do:

Take the FOB off your keychain, set it on a table or something where no one will touch it and it won’t move or shake. Start the car several times and see if the trunk will open on its own. If it does, it is the wireless control module and I think on the Cobalt it is built into the BCM.

If the problem does not persist, the FOB in question is the problem. It is hypersensitive on one or several buttons or simply the way your key touches the fob is causing a trigger.

Always try to isolate the problem when working on anything to eliminate possibilities until you are left with the only possible answer.

Cheers!
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post #8 of 16 (permalink) Old 04-01-2014, 10:01 AM
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Quote:
Originally Posted by fierodough View Post
If it does, it is the wireless control module and I think on the Cobalt it is built into the BCM.
RKE module is separate from BCM it sits under the dash pad left and ahead of the passenger side airbag.

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post #9 of 16 (permalink) Old 04-01-2014, 10:20 AM
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Quote:
Originally Posted by Coby7 View Post
RKE module is separate from BCM it sits under the dash pad left and ahead of the passenger side airbag.

^this

Specifically, it's under the panel that has the windshield defrost vent. To get to it, you need to remove the a-piller trim and pop the panel up.


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post #10 of 16 (permalink) Old 04-01-2014, 10:35 AM Thread Starter
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after looking at the key FOB the solder is loose so that is more than likely the issue with that...I have the key off of the ring since the recall so I will start the car with it sitting on the seat now and it will still happen.

---------- Post added at 10:35 AM ---------- Previous post was at 10:33 AM ----------

So if it is the control module how tough of a fix is that for a newb?
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