I have a 2015 Colorado and have intermittently been getting the “Service Theft Deterrent System” since I got the truck (new). Has no impact whatsoever, just a pain when I try to sell one day. I also get an intermittent Check Engine light, for which my mechanic unable to determine cause. It comes and goes, just like the Theft warning. And sometimes my radio/speakers won’t work. Mystery ailments that come and go.