I have a 2018 6.4 with all the wiring and computers. I will be using HP Tuners. I have to two harness which connect to the PCM, but the harness with the OBD2 is on another harness which does not plug into the PCM. Any info how to wire the OBD2 into one of the two PCM harnesses? Thanks
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Get a spare C1 connector from a junk yard and ODB2 connector. Hook it up with using DIYHEMI.COM's GPEC2 intel pinouts. https://www.diyhemi.com/hemi-intel
Pins 52-53-72 ground, Pin 96 +12v, Pin 23 key-on 12v, Pin 57 Canbus C+, Pin 33 Canbus C-
ODB2 Connector PIN 16- +12V, Pin 4 ground, Pin 6 Canbus+, Pin 14 Canbus-.