DIYers have had mixed results with Dorman brand replacement auto parts, so I was skeptical here. Replacing a missing GM key fob on a 2011 GMC Sierra is costly (especially the remote start keyfob), not just for the fob itself, but the more costly and time-consuming requirement to have it programmed at the dealer. Aside from my need to fiddle with the module to get it plugged into the OBD connector under the dash, this was an easy process. BUT read the instructions carefully. You must be inside the truck with the doors locked and the ignition "on" but not running. You have two minutes to re-program all of your key fobs, and that includes the need to re-program your existing old one (if you have it). In order to make sure you don't just hand it out to others, it only has three user sessions. Five minute job, start to finish.