Engine cranks, but will not start, have unhooked edge and tried no difference, fass pump putting 15 psi to pump, put cummins vp44 harness (directly hooks to battery and powers low idle and high idle circuits on pump) on pump, no difference, injection pump little over a year old. Any ideas, truck ran fine, set for 4 months while tranny and clutch replacement, ran fine for a week and now this issue with codes 1689-no communication between ecm and injection pump, 0237-boost sensor circuit low voltage, 0577-?, and 1693-fault in companion module. Any help would be greatly appreciated! Thanks in advance.

 

I would say either vp or ecm went south.