need help, lost keys

So a locksmith opens your truck, now what??? FOB is still needed with a push to start rig.

If you were existing on "ONE" FOB that means you already lost one. If I am correct then I can't say anything but get your rig towed. Hope you have Roadside Assistance! Then just hope the Dealer offers "LUBE". ;)

If you don't have any of the two original fobs (or a subsequent clone), you're at the mercy of the GM dealers. If you have one of the original fobs (or a prior clone) any reputable locksmith can make a duplicate and program it into the vehicle's system.

Just checked again, it looks like the fobs are way cheaper
Now, like 75 $ see if you can get a place to clone it.

I dont know how the new ones work( i should get a 3rd) . But on the old ones you could make a 3rd if you had 2 fobs. If not they say they have to reboot the computer and program both. Some places said they could clone the first fob, a little cheaper. But it would only work as the orginal one and not give presets or alow you to make a 3rd. The new ones with the keys inside are more money. I think I looked when i bought the truck and the fob alone with a blank key and unprogramed was like 320.

There are mobile locksmiths with vans that can come to you and make you any fobs or keys you might need. Prepare to prove ownership and it still won't be cheap. Here are just a few.

mobile locksmith

Did you call a locksmith?