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Hey! So, I'll give you the quick history... Over the last year we've replaced 3 coil packs. It started with a miss and the dealership recommended a top engine clean and repair of an engine mount. We did that and it didn’t fix it. So they changed one of the coil packs and that did fix it. Then a few months later the miss appeared again and a different dealership replaced another coil pack, at that time at the different dealer they also changed the spark plugs for the other cylinders on that bank (1,3,5 ), the coil pack they changed was #3.

Then right before Christmas another coil pack. And now it started missing again and this time I took it to dealer and they said it was the #3 and #4 coil packs. Which the #3 was just changed in July. That one is covered under the GM 2 year parts and labor warranty and at the local dealer we go to they said they didn't record which coil packs they changed before. But I had record from the other dealership that it was #3 for the one in July.

My question is, what is causing these failures? To have the dealer fix them is like 400 each time! I'm probably going to do the fixing myself from here on if this keeps happening. I just want to understand why it's failing? Are they not gapping the plugs right? I would imagine they are checking for leaks and moisture once they are in there? I’m starting to not have any faith in them and want to understand everything better so I can be more knowledgeable and prepared for our next conversation at least.
 

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Hey! So, welcome to the forum. ;)
Your vehicle is nearly 11 years old. That should say enough about why things like coil packs are beginning to fail. Coil packs don't last a lifetime. It may have been in your best interest to have all of them changed while the engine was being worked on in the first place. It's rather surprising to read that someone changed the spark plugs on only one bank of cylinders and not on all of them. Spark plugs don't last a lifetime, either.
 

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30 years of driving, closing in on 1 million miles with 4 vehicles (all bought brand new), and not a single coil box or coil-on-plug replaced in any of them.

To have as many "failures" as you're having tells me someone doesn't know what they're doing : they're treating symptoms instead of fixing the problem.

But that's the difference between someone who knows what they're doing and someone who looks like they know what they're doing. You need to find the former and avoid the latter.
 

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...
they're treating symptoms instead of fixing the problem. ...
There's truth in this statement. A few conditions besides a failed coil pack can result in misfire codes. A short list of them includes: fouled spark plug, cracked spark plug insulator, burnt spark plug electrode or broken insulator tip, fuel injector problem, and contamination between the coil pack and spark plug. Many of these problems can be resolved with a proper diagnosis during the first shop visit. Often, they're overlooked because of either lack of tech experience, or unwillingness of the owner to give someone time necessary for the work.
 

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We just got our 2011 out of the shop after having misfires on 1,3 and 5, and throwing codes for the O2 sensor. Turned out to be transmission related. they flushed and filled the fluid and everything has been fine for the last few weeks. the Transmission Control Module solenoids went out 6 months ago and caused the same misfire codes.

Does the '09 have the coils and plugs under the upper intake manifold? If not they are super simple to replace on your own.
 

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Maybe somebody scared her off?
Hasn't been here to see any replies to speak of . . . . lol
Replies have been read according to site usage indicators. Might be saving $$ or searching for right tech to get the vehicle repaired properly.
 

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Hmm mm .. .. . possibly. One never knows when no visible replies. No real verification for us readers .(y)
 
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