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do i have to buy anything else or just the one vehicle programming?

i have a 2011 cadillac srx with a 3.0 v6 needs a new ecm, i installed a new ecm with the understanding hptuners can program it, was able to wirite the vin and everything but i cant program the key to...

what number am i looking for on the outside neither have thaat outside

I have a 2011 buick regal with a 2.0t; Vin 2G4G15GV6B9189445; and i bought a ecu out of a 2012 cts with a 3.6; vin 1G6DJ5E38C0141596; when I put the vin from the buick in i get a vin/os pair error. ...