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Discussion Starter #1
Removed 6.6l lly blown motor and installed long block. Now Check engine light was on and no start. Hooked up my snap on scanner and have a glow plug module code. When I go to the BCM menu it says no communcation. I have tried 5 times doing the 3 x 10 minutes for the vtd and still no start. I have power to all the fuses. No other codes. Can't find wiring diagram or the bcm info for this. At my wits end with this one. Any help would be much appreciated.
 

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Either bcm crapped out, or more probably a wiring issue between bcm and ecm.

On some other early duramax pickups, I've seen threads were some wring got stretched when changing out parts and the pins in connectors got separated.
 

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Discussion Starter #3
Update. Talked to a shop owner and found C4500 and C5500 don't have VTD or BCM. With that said and alot of wasted time later. LoL Still the only code is glow plug module. The reading I'm focused on is
desired frp is 43 mpa
actual frp is 2 mpa - problem is here but I not getting no codes referring to fuel issue!
I installed new reman injectors
new reman pump
new frp
More guidance would be much appreciated.
 

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