I have an 01 Tahoe that had 1 key fob that worked fine. I wanted an additional one for my wife so we ordered a new one. I followed the programming instructions exactly. Now neither remote works and neither would successfully program. The truck enters programming mode every time I try but the remotes themselves will not work. So the old and new both don’t work and I have to use the key now. What could be the issue? Yes I’m doing the program procedure correctly.