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My Trailblazer makes a loud thump or knock noise once in awhile. it sounds like it is coming from the center console. It kind of shakes the car pretty good too. It has happened about 6 times since October. Usually while accelerating or stopping. What could it be?
 

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Was reading about this type of noise on the Encore GX as well that they have yet to get figured out in a Buick forum. Several people had a loud bang noise on that one as well, I mention it because it is basically the same platform but didn't really see much posted for this on the trailblazer.
Encore GX Loud Bang | Buick Forums
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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Could it be hard upshifts and downshifts related to the 9spd?
 
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