This dag on Cummins isx 15 code1921 dpf full

[Bengy88]

(12-30-2023 )Nhramember Wrote:  

(12-30-2023 )Rawze Wrote:  Check the little tube and circuit for the exhaust pressure sensor on top of the thermostat. Make sure all sensors are also OEM only. Also check the sensors under the truck at the DPF, DOC, etc.

DOC missing is not a normal code to get when the system acts up.

Might also need to remove the DPF filter and see if it is actually clogging up like the alarm shows.

The engine is only going to last so long before it wears out to the point that it cannot keep those cans happy at some point.

Any regular coolant loss?... oil consumption?. etc?.

No coolant got a small leak under the bunk . I have a leak at the compressor but no oil consumption. Can bad def cause it to not regen to temperature?

Nope, def doesn’t have anything to do with a regen, def is sprayed into the scr catalyst not the dpf or doc, you really need to follow what Rawze told ya and then pull the dpf and doc to check for cracks, melting, elements being pushed, clogging etc. the temperature of your regen all depends on air flow in, fuel in, doc health, dpf health, and exhaust flow out.