I had my truck towed into our local dealership. After several hours of diagnostic work the tech said it was a crank sensor. After installation of the sensor the truck still didn't start. He said it needed injectors. I was 5months out of warranty. GM agreed to warranty the injectors (71K miles). After installation the truck started and the tech hit the fuse box. It died. After inspecting the fuse box we found that a rodent had gotten into the box and chewed 5 wires.

I have new injectors that were part of the warranty.:)