[ChevyGuy]

I'd take the car back to GM and have them fix your cruse control (I'm assuming that's factory). They should be willing to do that much.

As I understand it, in order to wipe out a key from the car's memory, ALL keys must be wiped and then each key programmed back in. So for the remote start, you need someone to re-setup the remote start system. If you have the manual, it might explain how to do that. Or, if you know the brand, you might try searching the web for the install instructions. Everything's probably still wired, so you just have to go though the setup part again.

Good luck.

 

[ChevyGuy]

Can't imagine what they could have done reprogramming the key that would make the cruise control stop working.

From reading other threads, it appears the LS trim doesn't come with cruse control, so they have to change out the steering wheel and have the dealer turn on the feature. It appears that OP has a LT, but my point is that it does appear possible that faulty programming could turn it off.

The dealer is probably thinking this is a classic "last one to touch it gets blamed" and it was just coincidence that it failed just then.

Maybe the best thing is to have them fix it and then discuss it when the problem is found. It's possible the dealer will step up and won't charge if it is found to be programming. But they don't want to start with the assumption that it's their fault and then find it's a worn out switch.