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My rattle seems to be coming from the rear seat. Something underneath the seat is making the noise, but if I slide it up from its rearmost position the rattle stops. My car is going back in.
 

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I'm having rattling issues with mine as well. It's mainly on the driver's side. I can't tell if it's in the B pillar or something in the driver's side door below the window but I'm not an auto mechanic so I shouldn't have to know where it's coming from. I've taken my Blazer to the dealer twice to get it fixed in accordance with service bulletin 19-NA-111. The technician was able to hear the rattle but it's not fixed. At this point, I'm waiting for the dealer to do some research into this issue and call me back so I can take it in a third time. I've had this vehicle for just over a month - about 2100 miles. It's very frustrating.
 

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I
Hey all. New here.

Just got my new Blazer RS 2 days ago and there has been a rattling sound or something similar since I drove it off the lot. I had not installed anything at that point. Tried removing the rear cargo bar...it’s not that.

Sounds to me like it’s coming from inside the cabin. But can’t figure out what could be rubbing together or banging that would cause this. It’s fairly noticeable any time you drive over a few miles per hour. Can’t tell if the sound is more plastic or metal.
I have this same issue and can not locate the source of the rattle. Along with several other issues. :(
 

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I purchase a new 2020 Blazer in the beginning for January and it has been back to the shop a few times now for rattles from what sounds like the front passenger door and maybe the rear passenger/passenger b-pillar. This last time at the dealership they informed me that the pulled another Blazer up to mine and ran all the same test and found that the other one rattles as well and submitted this info to GM. My services tech informed me that GM qualifies this as a normal sound, since the other Blazer they tested also rattles, and they could not replace or fix any parts.

I decided to take matters into my own hands. So I pulled off the front passenger door card and found that the plastic clips that hold the door card to the door frame and extremely loose when they are put into the door card. So I wrapped each clip in felt tape to make sure it was secure and didn't rattle around while on the door card. I reattached the door card to the frame and for that past week or so it has been for the most part rattle-free (there are still a few less noticeable rattles in the car). I am hoping that this solves the issue if I do the same to the other door cards.

FYI, if you do the same be very careful pulling the door card off the frame. These plastic clips that hold the door card on are very cheap and are easy to break. Most of the time they will rip out of the door card and stick in the holes of the door frame. I highly recommend getting a trim removal kit from amazon to help get these plastic clips out.
 

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my dealer made the fix (supposedly) outlined in the TSB and it seems fine now. I heard a very faint ticking sound coming from the passenger B pillar area prior to the fix.
 

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I think I finally have that rattling sound others have had. It seems to be coming from the passenger side of the vehicle. It sounds like static in speakers when drive over bumpy roads. Seems to be worse when the vehicle is cold like when it was sitting overnight.
 

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I think I finally have that rattling sound others have had. It seems to be coming from the passenger side of the vehicle. It sounds like static in speakers when drive over bumpy roads. Seems to be worse when the vehicle is cold like when it was sitting overnight.
it may be the issue previously addressed via TSB
 

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There is a fix that may be the issue for some of you with the B pillar rattle. Tell your dealer to look up bulletin #19-NA-111. The fix is to re-torque to proper specs the fasteners for the door latches. This will be relevant to 2019 models only.
View attachment 400
So I have had a rattle since around 1800 miles, that was late feb early March, made my appointment the day shelter in place went into effect so needless to say it got cancelled. Had an appointment today, stayed for 7 hours at the dealer because I wanted to be there in the moment when they told me they didn’t hear it. Surprise surprise that’s what they said. As politely as I could I let them know i wasn’t going to let it go, and if they wanted to duplicate the sound, sit behind me and let’s go for a drive until we hear it. Took it around the block and bam he heard it. Barely, but he at least heard it. Mine was a clicking or tapping sound right by my ear in the driver b pillar/door. Even if I would apply pressure on the arm rest against the door I could get it to click usually.
We went on 4 more rides after he tried something each time. Having spent time reading this thread in depth I let him know about this fix, and he spoke with GM and they confirmed that re torquing this to spec fixed the problem in about 95% if blazers. He did the fix and I drove for about an hour after and didn’t really hear it, I thought maybe once or twice but maybe it was my ears playing tricks cause it was really faint. They advised me if it happens again to let them know. They tried 3 other blazers on the lotnwhile I was there, couldn’t duplicate it on any of the new ones, and they could on the loaner blazer they have though. The technician said he was intrigued now and was gonna work on the loaner to see how they can make sure they find a permanent fix and to do what he did to mine and see how that works out.

but thanks for all the posts, you helped me be able to stand by ground about getting a solution and even guided where to go.

here’s to hoping it stays quiet. Only had it since February she’s got 3200 miles on her
 

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Was your problem coming from the rear seat? I am still having that rattle under the driver side rear seat. I also had the b pillar ticking noise, but the TSB fix solved that.
 

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Discussion Starter #72
Was your problem coming from the rear seat? I am still having that rattle under the driver side rear seat. I also had the b pillar ticking noise, but the TSB fix solved that.
On my first blazer, :), they had to replace the whole rear seat to fix the sound. They weren’t really sure what was wrong.
 

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Hey all. New here.

Just got my new Blazer RS 2 days ago and there has been a rattling sound or something similar since I drove it off the lot. I had not installed anything at that point. Tried removing the rear cargo bar...it’s not that.

Sounds to me like it’s coming from inside the cabin. But can’t figure out what could be rubbing together or banging that would cause this. It’s fairly noticeable any time you drive over a few miles per hour. Can’t tell if the sound is more plastic or metal.
You may not have this problem anymore but I heard a concerning noise when I got my blazer quickly found out this was the seat coolers inside the front seats. If you turn them off the noise is gone or you can simply drown out the sound by blasting your music. Man those Bose do some wonders don’t they
 

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If your ventilated seats are operating properly you should hear very little. I can barely tell when the fans are on, even at the highest speed.
 
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