Hi fastspecialties on gm cars up to 2003 you can do the 3 10 which means 10 minutes key on 3 times unless is a cadilac wich uses pats3 after 2001 then after that you need a pass-thru and gm suscrubtion to do the relearn also if the pcm was replace on any year you need to rewrite the vin number before you do the key relearn also done with pass-thru and gm sub cost is 55 dollars for 2 days hope this helps ford and chrysler works 100%.