I'm having issue with my 2015 Tahoe misfire on cylinder 5 and a loud ticking noise that comes and goes. Took it to my local mechanic for diagnostic. They advise that it is a collapse lifter and that the cam might be damage. Found this bulletin _https://static.nhtsa.gov/odi/tsbs/2016/SB-10078567-7690.pdf . I call General Motor to see if there are other with the same issue. They stated "No".