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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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