Hello XXXXXX,
You might have only a blown fuse so be sure to check all the fuses ubder the hood and in the cab.if it's not fuses,It sounds like your security system has triggered. One way to reset it is to hook a battery charger to your battery, get in the truck turn the key on let the key set in the on position for 11 minutes.Turn the key off for 30 secounds and repeat this procedure 4 times. The last egnition on ,leave it on the full 30 secounds than try to start the truck.If non of this works the only other option you have is to take it to the dealer and let them run a diasgnosis on it.
There are no other fuses,and the battery charger is to keep the battery up while your going through the resetting procedure.Ok lets do it like this.
turn key on for 11 minutes- in the on position,turn key to off position for 30 secounds.
turn the key to on position for 11 more minutes, then off for 30 secounds do this a total of 3 times on the-- 4th time you will turn the key off for 30 seconds then on for 30 seconds and crank it do not turn it off.It should run.If that doesn't do it it could be the electrical part of the ignition switch, Which you can replace your self, and go through this same procedure with out taking it to the dealer.Sorry I didn't explain this better at first.
Chevy Technician
ASE certified,expired. 30 years experiance self employed semi-retired.