Looking for help. I bought a used 2010 Sierra. Only has one key. I'd like to get a key fob and program myself if possible to save some money. There is no driver information center and when I push them odometer stem, programming new remotes does not appear. Made me think that originally the truck was not equipped with keyless entry. However when I lock the truck for the night and use the key manually to re-enter, the alarm goes off until I start the truck. Does this mean I have to go to a locksmith to program new fob? Is there a sequence of cycling the key then holding buttons etc. etc...to program? Any help would be appreciated.
