2500 hd chevy with Duramax cranks but no start . No codes all data on scan tool appears normal good fuel supply and good rail pressure all power and grounds good at ficm and at ecm. load tested injector harness from ficm to injectors . checking injector pulse at injectors you get 2 pulses then no injector drive . cranking rpm good and good crank and cam signal. no antitheft activity. checked engine speed signal wire from ecm to ficm good . fuel checks clean and no water . was driving when it quit with no warning . Sounds like a bad ecm but usually there are multiple issues when I find bad ecm . not this time all data appears normal. any help would be appreciated.

David Wallace
Technician
Parr 3 Automotive
Columbus, North Carolina, USA