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Message: <blockquote data-quote="AuroraGirl" data-source="post: 26046" data-attributes="member: 9417">Always take advantage of a shipper to you programmed pcm with mods that you want. For example maybe you lowered your truck and you want to raise you speed limiter (normally tires or driveshaft size and rotation rpm esp at 4wd angles dictates the limit ) , maybe you want the old school engine block heater that will work when it’s 0 out and not just -25 lol, the pcm would throw a light for the thermostat if you tried using a normal cord, use it to delete engine light for things your frankly not going to touch. Me would be small Evap leaks. I would also delete rear o2 codes from it depending on my setup. I have good cats rn so I’d keep converter efficiency codes as it stands now. Also vin has to be inserted. If you HAD passlock and wanted it gone you could disable it that way.  You can have mild performance boosting ones. Your year has computer control charging so I’d delete that and run a normal alternator. If you don’t have these options you want done and can’t find a site that builds to your liking we have a member(may have been Silveradoforum if not here ) who takes pcm shipped to him and will do that stuff for you. But as was said. Don’t throw a computer at it for no reason Also by the way the relearn for anti theft is done once the pcm is installed.  So user -procedure. This is to prevent hot swapping a vehicles pcm since vin are prominently displayed and someone could order a pcm directly and then swap it in 5 min after opening the interior and hood. Not a hard thing to do if you know the habits of the owner and you look like you belong.</blockquote>