09 prostar with ISX randomly shutting down

[Zmcd]

I’m having very similar issue. My truck is doing the same things when abs light comes on. Reads abs module and sometimes electrical fault. Hard to get it to stay on. How did you connect ecm straight to batteries? Did that not cause any issues? What did that tell you? Something wrong in your harness?

(02-11-2017 )09pornstar Wrote:  Last update guys; after i swapped the ecm, changed the coolant level&temp, differential presure, oil temp&pressure sensors, fuel cut off selenoid, inspected the ecm harness&ignition wiring, changed all fuses, i finally decided to unplug the ecm power while engine was on to see what happens and i imediately slapped my forehead..the exact same faults came on..so i bypassed all that crap and conected the ecm to the batteries and truck never shutt off since..of course i need to get a new harness or find the culprit on a warm day..i spent under 450$ so i guess im happy i didnt drop it at the dealer! With your help i eliminated probable causes one by one and it’s finally working so thanks a lot guys!