2000 gmc 6500 truck wont turn over . - GMC Cars & Trucks

sounds like its broken internally or something is interfering with the switch itself

We have a 2000 GMC 6500 454 engine. Truck will shut off, we turn off the the ignition wait for about 4 or 5 minutes. Doing waiting time, if you turn the ignition part way on, you can't hear the fuel pump, and if you try to start, it will not start . But after the 4 or 5 minutes, when you turn the ignition part way on, you hear the fuel pump, then it will start. It will shut down with a heavy load or even with out any load. It seems to do it more often when it's really hot out. It will shut down as much as 10 times.

is the steering wheel locked

could be that key switch has went bad or key is worn

check for a spark if no spark and no fuel to feed bar for injectors ,then try spare key if that doesnt work then its dealer only to look at immobilisor

check fuel pump relay, is fuel present at motor 

did you try the fuel filter

Do all the forward gears work or does it rev high in 1st and skip 2nd and shift right to 3rd?

i found the problem it was the acuator on the side of transfer case so i took it off and manualy put it in 2 wheel drive now all i have to do is get under there and turn it with a tire iron thanks but got it under control......