HELP!! I'M STRESSED OUT!!! I am having problem with my '02 GMC Duramax, It won't start up at all!! At first, I had an Edge juice with attitude on it so i disconnected it and put stock harness in to the same place. Then crank, crank, crank and finally it starts up but no smoke or anything at all. Just clean smoke coming out of 5" exhaust system with 6" tip. So i thought i'd take it out for a drive and clear out all the computer system then parked it again. Then tried to start again and it won't start up this time and not even run once at all. Of course, i primed the fuel everytime i tried to start it but no start, i pumped that son of a ***** to the hardest and still no start. So i hooked up scan tool on to it and the codes says P0090 (fuel pressure regulator problem), PO335 (crank position sensor), and U1800 (lost communication with fuel injection module). I replaced the crank position sensor but still won't start! I checked the glow plug controller and noticed that there is a little burnt/fried wiring on it so i replaced it no matter what and still no start. I love my truck very much and named it Blue Ox. I need it back on the road again. But my best guess is burn out or bad ECM?? Is that possible to have a bad ECM (engine control module) on my duramax?? Or will it be a Fuel Injector Module problem?? My brain is getting drained out by thinking and figuring out too hard for long time. I am confused!! Hope one of you guys have similar problem as i do and able to verify what is my problem?? Thanks!!