Inj spill valve code

[joed2323]

cm2250 2013 no delete
anyone have any info as to why I'm getting this code at random times? Comes on and goes off, doesnt seem like it's affecting anything except sooting up the dpf. Under 200miles dpf filter soot load goes easily over 2oz from 0.

I could be climbing a hill empty, every once In awhile it will puff out a cloud of black smoke or during jaking at random times then back on the throttle, generally this code does not show up when blowing smoke, just driving normal say 60-70mph on highway

Im gonna pull the valve cover off and Inspect, but the spill valve is interval of the inj, so is their a way to pull out the Inj and bench test it or, regardless should I swap the inj just to be safe? It's showing spill valve #2