Magnumsmydog
New member
- Joined
- Aug 7, 2020
- Messages
- 22
Well got alot of miles on the fummins and I now got code p1689 no communication between vp and ecm. Truck runs great not a smoking power monster but stock and really driveable. I've checked all wires and grounds. I'm wondering if this is electrical mosfet failure. Or should I look at alternator side. Which i used dodge alternator and oem regulator. Any thoughts?:nail: