MID 128 PPID 330 fmi7 ? Volvo D13 2008

Can you guys advise ,PLZ? I got this code, my REGEN start running very often and pukes white smoke during regen only? 1,624,000 miles
Where is Pablo thread with all Volvo faults? ?

 

Thx TrKr ,
"discharge recirculation valve" ,
I didn't know what's this valve for, didn't replaced it yet; just called Volvo here in Windsor Ontario, part#20914174 , 220 $, cad; they have it in stock; looks like easy DIY job;

 

Actually the part # I mentioned above and the problem throwing the code was cause by this solenoid valve, located on the left side of the engine under the oil separator/ECM; This valve has an air fitting and a steel airline going across the motor , and opens/close with air pressure the valve I mentioned in 1st photo. I hope this helps;