A26 International white/blueish smoke from exhaust

I believe you will tend to get white smoke when the DOC is starting to break down. If the DOC has never been replaced then it's a possiblity with the mileage you've put on it.

@Heavyd knows far more about that engine than I do.

 

That code is basically saying the regen was successful, but the soot load is still high. You are likely looking at replacing the DOC due to the smoke. The smoke is an indicator of an inefficient DOC. Soot loading codes would require at least removing the DPF, getting it baked, cleaned and flow tested. If it passes the visual and flow test, reinstall with a new DOC. To cover your bases, you are likely looking at replacing both the DOC and DPF with that mileage.

 

When DPFs become plugged, it's not soot, it is the ash that causes most of the plugging. The regen basically bakes the soot down to heat and ash. Ash will not burn down any further and needs to be cleaned out. You can never get 100% of the ash out. Sometimes even with cleaning, the DPF is still too plugged to reuse. Any location that provides DPF baking and cleaning should be able to flow test it after cleaning to measure if it is ok to reuse or not. If the truck is still smoking when you do a forced regen, this is still an indication the DOC is not efficient and something is wrong with it or the doser. In that picture, there is no regen happening. When there is a regen happening, your DPF inlet and outlet will be around 1000 degrees. Keep an eye on that. Forcing regens will buy a bit more time if the temps are normal.