2016 KW T-680 ISX15 CM2350 -Code 125- At Wit's End...

[brich240]

That being said, after performing regen Tuesday evening & manually clearing the fault code, Wednesday morning I left Winder & drive approx 375 miles down to around Mobile, Al.
I was empty, pulling my flatbed. I shut the tractor down 3x for either fueling or break(s). Constantly monitoring my boost gauge and staying alert for any anomalies in tractor behavior.
None detected. No codes. Zip. Nada. Nothing.
I don't know if I should be happy or doubtful. Having this problem for as long as I have it's difficult for me to get too happy too quickly.
Engine seemed to run smooth & mpg good.
Also, did not notice the tractor going into passive regen on the trip down. Maybe I just didn't run it long enough, I dunno. But, I never detected any "high idle". This crap is driving me crazy. Last night was about the first half-decent nights' sleep I've had in the past week and a half.