Had the same steering wheel click issue with my 2014 Sierra K-1500 (tilt only steering column). I started noticing it about 13k miles and seems to be worse in warm temperatures. First time I took it in they replaced the column and said it was fixed. Don't even think they test drove it because pulling out of the parking lot it has the same issue. I took it back to them where they kept it for almost a month. Tried 3 different columns, told me they even brought in a GM engineer to look at it. They said it was fixed, I drove it home an noticed the same issue while turning into my garage. I thought at this point I would give them some time, maybe other dealerships would come up with something. I'm not sure if they actually know the root cause of the problem yet.