when trying to program a fob from my truck for another truck it unlocks both trucks, can I fix this so that it only unlocks the new truck? Also when I program the fob for the new truck, it kills the other fobs for that truck?

 

When you program the fobs you need to do all the fobs your going to use(up to 4). Once the in the program mode hit a button on all the fobs you want to use. To unprogram your other truck try entering the program mode and then let it time out (20 sec) and see if this works.