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I have a 2012 Freightiner Cascadia with an ISX15 CM2250 Engine. Recently I have gotten my dpf filter and doc filter cleaned. I took it off myself without a computer thinking I would save money but eventually broke down less than 15 miles from my home location. My mechanic told me I was supposed to use a computer so I ended up having to replace my egr and going to freightliner for an ecm update. After the update I was getting codes 1922 1981. So I took it back to my mechanic and he did something to get rid of the 1922 code but now I still have the 1981 code. The code says that dpf is clogged or it could be a harness issue. My truck will start a regen but kicks it out within less than 10 minutes. Do I really need to get dpf cleaned again after only going less that 20 miles? Also, I've replaced the differential pressure sensor on the dpf, the scr junction box and a temperature sensor on the scr. Thank you in advance for any help that you can give me.
Any number of things could have happened. Make sure first of all that you do not have any gasket leaks. Any leaks in the exhaust system will cause issues. Make sure the pipes going to the DPF differential pressure sensor are not clogged and if the sensor is old, you should have replace it when the cans were cleaned.
Also, without cummins insite, you are driving blind there. I would suggest you remedy that if you want to keep the regen system operating. Otherwise you will always be at the mercy of the over-priced stealershits.
Whenever you remove those cans and have them cleaned, you need to tell the ecm you did so via cummins insite. The ECM counts up the amount of soot it "thinks" it has made over time and does not count down. Only performing a "DPF Replacement" and "Maintenence Reset" will reset this counter, and you should only do that when you get the DPF cleaned. it sounds like you may have missed that step perhaps.
Your regen hsitory can be seen in Insite. At 14:38 in this video I show a regen history...
Don't rule out your NOx sensors for causing issues. They start going bad after about 200k miles typically and start to read incorrectly. They do not always throw fault codes but do make the engine have excess egr gas and excess black smoke, sometimes clogging the dpf repeatedly sometimes. They will also give high nox errors sometimes too.
Maybe this is some places to get started.
Before calling it good, YES you should do a forced regen to make sure everything is operating ok.
I've replaced the nox sensor near the aftertreatment injector about 40,000 miles ago. What happens if the plastic piece of the imap sensor is broken off into the intake manifold? Also, I smell def fluid like it's not burning properly.
