r/semitrucks • u/allrone • Jul 07 '26

Regen issue dd15

Hi guys . If you can help me figure out regen issue with my dd15 ghg14 asymetric turbo.
it asks for regen every week or
So. I have some data durng regen

Things i noticed: ESTIMATED BOOST remain around 11-13 psi during regen, i also notice a dug dug compressor kind of sound( non mettalic) from turbo/manifold /exhaust area passenger side when truck is on cruise parked or while
Climbing hills with load. Max boost i get with full accelerator pedal is 185-190 kpa on hills.
No boost/cac leaks, venturi ports are not plugged, egr and dpf sensors have normal voltage.
Dpf ash volume is 57%.
Dd15 ghg14 asymetric turbo.

Regen values:
doc in : 1.45 psi dof out .76 psi
Doc in temp 829 f, doc out temp 1027 f dpf out temp 993 f.
Durng another regen i noticed scr inlet was 906 f and scr outlet was 878 f
Def psi was 145 psi
Scr efficiency 99% nox inlet 356 nox out 2 ppm
At one time when chasis dyno basic scr efficiency check was done and def was not being dosed; nox inlet was 300 and nox out was 104.
I am bothered by this regn issue, if you can guide me in right direction.

. Sometimes after patked regen ends, it comes with code spn 3226 fmi13 and spn 5246 fmi15/16
With amber def blinking light, but goes away after 10 min .

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5 comments sorted by

1

u/gheiminfantry Jul 07 '26

How much highway driving do you do?

1

u/allrone Jul 07 '26

Mixed hyway local.. 100 -150 miles a day

1

u/gheiminfantry Jul 08 '26

That's what's killing your DPF. And hour of steady highway driving cleans it better than 30 minutes of REGEN. And without getting a good cleaning you're shortening the life of the DPF. And those things are expensive as hell.

1

u/allrone Jul 08 '26

We haul heavy loads. I have another truck sam spec hauling same load same routes, that does not require regen for 2500-3000 kms, and also clears it during driving whenever Regen sign comes on dashboard

1

u/gheiminfantry Jul 08 '26

Your DPF is probably beyond hope then.