I was having this same issue with my 2016 SEL almost 2 years ago. This hurts seeing this post and how easy and cost efficient the replacement is. I could not find a video anywhere with this same issue at the time I was having the issue.
I was out of options because I could not get it to open at all some days so I had to break down and take it to the dealer to replace.
Seeing that the part is only around $60 and the video showing how relatively simple the replacement is hurts knowing how much I got ripped off. Which I knew anyway at the time but seeing this just opens old wounds. But again at the time I was out of options.
Seems a lot if people have had this same issue with the liftgate.