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Discussion Starter #1
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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I would start by getting your FOB repaired.
 

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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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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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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.

http://www.yourcobalt.com/forums/electrical/30592-how-properly-repair-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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Discussion Starter #6
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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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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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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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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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?
I don't think it's your module, but it could be the trunk release switch is somewhat stuck on.



Try fiddling or disconnecting the switch to see if it still happens.





And it is easily replacable.





---------- Post added at 05:39 PM ---------- Previous post was at 05:18 PM ----------

If it is the switch I believe it is an Omron switch GM # 25762050

NEW 25762050 Cluster Switches Trunk Switch FOR GM 2009 2011 | eBay

Cheaper here...



# 26 in drawing.
 

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Discussion Starter #13
I don't think it's your module, but it could be the trunk release switch is somewhat stuck on.
Try fiddling or disconnecting the switch to see if it still happens.
And it is easily replacable.
I just noticed this reply...thanks for the pictures I will take a look at that after work and see if that is the issue
 

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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.

http://www.yourcobalt.com/forums/electrical/30592-how-properly-repair-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.
update on FOB. I have 2 one was coming apart and need to have it resoldered. the other one I used a hole punch like from the link and put some of the foil tape and it is working like the day I got the car again. Thanks a bunch Coby7
 

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No problem, I'm here to help. Hope you didn't put too much solder on the clip because in this case more is not better.
 

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No problem, I'm here to help. Hope you didn't put too much solder on the clip because in this case more is not better.
I didn't even attempt that part...I'm probably going to send the one to you still. one I had the battery clip was still in place so I just put the foil tape on the buttons
 
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