BenK wrote:
Wonder if there is a way to kill that lost fob...therefore the one you still have...
Otherwise, the baddies can access your vehicle if they 'found' the lost fob...
On my denali and my 04 silverado and my two mercedes, YES disabling a key or fob is possible and actually pretty easy to do.
In one case you take the keys or remotes you have and go through a process similar to a new key but instead of adding a key, you identify the keys you have and the other keys or remotes then become non functional.