I have 2015 Colorado LT…
I have 2015 Colorado LT with 96k and have never had a trans issue, but I understand the trans is different than newer ones. Always dealer serviced and I have had to add a qt of oil after 3k on a oil change...it doesn't leak...no one knows. Also, during this winter in Fl, I noticed it wasn't putting any heat out until I got moving....Put 2qts antifreeze in and fixed it, so much for the dealer checkin stuff