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I've had mine not open a couple of times now. You hear it click like it's going to open & then it doesn't do anything; then the next time it works fine. Yesterday when this happened it was like it was in a bind & then it pulled up the plastic bumper cover. I popped it back into place & has worked fine since then. I might need to get it replaced now because you can see a little hump in the plastic right in the middle.
The plastic bumper cover is a bit of a joke... I stepped on it to wash the roof of the truck and nearly pulled it off. It looks like a step and should be strong enough to step on in my opinion... But it isn't.

As a follow-up from my previous post, the dealership has had my Tahoe for over a week again this time. The problem has been previously twice, the first fix was by removing the shims and I’m not sure what they did the second time. Of course, which neither fix worked. They now have replaced the spoiler and its back at the body shop to have it painted and the roof line repainted from where the spoiler chipped the paint off. The body shop owner told me that he told the dealership the last time he had it exactly what the problem was and why it was sticking. He stated that he told them that the plastic trim piece was mounted about a 1/4" to far and when he got the new spoiler that piece was mounted correctly. I guess when I finally get it back, we will see if this fixes the problem.
Hi samvons,
I am really sorry to hear about the difficulties you’ve had getting this tailgate issue resolved. I can understand how dealing with something like this in a new vehicle can be very frustrating. Have you gotten it back from the dealership and checked if the issue was resolved. Please let me know once you have a chance and feel free to message me if you would like to discuss this further.
Enjoy your day,
Austin J.
GM Customer Care