Any update on this? I'm having a vibration cruising under light throttle around 35 and 50 mph. Definitely feels like it's coming from under the center console. I was thinking TCC as well. I luckily have an extended bumper to bumper and I just dropped it off at a highly rated GMC Dealer in our area.
I just bought a 2015 LTZ that well cared for and I got a bumper to bumper for 3 yr/ 36k and it had 97k on the odometer. I would suggest getting a extended warranty for it! If it was the Torque converter you would be getting codes. Get another opinion. I think Chevy has 0% offerings for the extended warranty as well. The LTZ has tons of electronic stuff so if you're going to keep it you should get the warranty or trade it in as soon as possible, just my 2 cents FWIW.
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