2004 LLY Crank no start need help!

[802duramaxlly]

Hi I have been fighting a crank no start for 4 months now with no luck any help would be greatly appreciated. The motor was swapped into a different body same year truck, I did head gaskets and head studs while the motor was out. I used everything from the other truck, all wiring harnesses, computers, steering column, BCM, TCM, FICM, used the Duramax frame, just different cab. I have a p0089 fuel pressure regulator code, high fuel rail pressure about 18,000 psi and desired is around 6,000. I just put in a new fuel pressure regulator , same issue. The truck doesn't even smoke or want to turn over, just cranks crank cranks. I just installed a lift pump and deleted the fuel filter housing, I tried my FICM in another durmax and that truck ran great. What am I missing? Checked all grounds, checked fuses, did key relearn multiple times. does not show oil pressure while cranking either Truck has great compression as well.

Thank you

Casey

 

[1FastBrick]

Sure its not anti theft???

 

[2004LB7]

crank and or cam sensor

 

[802duramaxlly]

I had a couple anti theft codes but I got those to go away, any reason it still could be and isn’t throwing a code or showing security light? Is there anyway to bypass anti theft all together? How could I test the cam and crank sensor

Thanks

 

[4dailyrunner]

crank and or cam sensor

While researching this model, I saw quite few YouTube videos about this. The piece that holds the sensor (1) bends (2) is defective or (3) vibrates loose.

The sensor disengages and becomes an open circuit.


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[Jakezed22]

X2 on crank or cam sensor, have You triple checked they aren't plugged in wrong? Like cam in crank and vice versa

 

[79LT1Monte]

Are you seeing RPM signal on your scan tool? If you see RPM and it's not smoking while cranking I would lean towards cam sensor