It was the crankshaft position sensor above the flywheel at back of engine -

I happily paid the $160 in labor to R&R the sensor as the starter had to come out and its almost a blind job - she's good to go now (and even better after some other performance and maintenance items)

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards