X15 Exhaust smoke while climbing a steep grade

Mine has done this a handful of times.
From what I’ve been told, it’s due to the DPF being unable to reach correct temperature during regen and it keeps feeding fuel into the system in an attempt to bring the temperature up. This is likely caused by a faulty sensor or a partially clogged DPF.
Last time mine done this it threw a code and I was able diagnose it.
However it cleared up once it completed another regen.

I had a faulty EGR cooler dump a tremendous amount of coolant down the exhaust and apparently it gathers in the DPF and SCR and prematurely clogs it. I plan to have mine cleaned here it soon.
However I have noticed if I do not idle the truck long (over couple hours) I don’t have this problem.

 

That is correct.

 

Yep thick white smoke just like that. Got thicker with acceleration, scared the #### out of me.
It’s done it about 3 times before it ever threw a code. However it’s only done it about 4 times in the past 6 months. I wouldn’t worry to much about it unless it continues to do it. Last time mine done it was over 25k miles ago ( right after I changed the EGR cooler) and haven’t had a problem since.

 

This was happening to me a while back. I asked @Goodysnap and he was spot on once again. Cracked or breached dpf filter whilst doing a passive regen. Put a new Cummins dpf filter in and never done it since.

 

Think the new filter was around $2500 if I remember correctly. Mine would only smoke when under throttle when it was doing a regen. Like you I could never tell when it was doing one passively driving down the road. Started doing it once a week at the same place every week. I run a dedicated account so I knew it was coming. Pulled over and yeah it was doing a regen. Pulled over the next week and it was doing a regen again. That’s when I asked on here.

 

I’ll be back home Tuesday night so could get the correct price then. Came with new clamps etc.