2009 isx dpf/regen issues

Hi all, I’ve got a truck that has me stumped and looking for some help!
I am NOT a mechanic, I can turn a wrench and do simple stuff but the more complex stuff I have a mobile mechanic do, he knows more than I.

I have a 2009 isx with dpf. The truck is a spare, probably less than 5k miles the last year. Recently we have started using the truck more but are having issues with it. We have owned the truck about 3 years. It has just under 900k on it. Engine history is unknown but was told the dpf filter was replaced at 700k. Truck has just over 30k hours.

Recently the dpf light comes on. Had mechanic look at it. He runs a regen and when done no check engine lights on but dpf light is on. Computer says soot level severe. It seems like temps aren’t getting hot enough for the doser to start adding fuel. Truck runs fine otherwise so not sure what to do.

Any suggestions? Or where to start? We don’t want to throw parts at it and pray that it’ll fix it, as that gets real expensive real fast.

Thanks!

 

The 7th injector has already been replaced, tons of carbon buildup. The dpf/ doc have been pulled. Doc has a little soot on the Inlet side, but doesn’t look too bad. Is there a way to test the doc? Next time mechanic is out can have him pull code history. Seems like something is causing it to not get hot enough. It ran its forced regen for over an hour and temps didn’t get hot enough. I know these motors are very finicky. Just trying to see if we can keep it running for a bit linter before its replacement is in.

 

When we first got the truck we kept getting some codes but either it went away or it wasn’t throwing codes/ lights
There was a doc face plug code but they went away.

I’m wondering if the computer is thrown on it if these codes will come up again. Could be possible that they just replaced the DPF. And not the DOC. I just looked, those docs are pricy!

 

I myself do not have insite, I belive my mechanic used jrpro or something like that. After doing some research It sounds like you can’t reset stuff correctly with the non oem software. That could possible be the issue? Not sure if it has the latest Ecm update, I do belive that it was updated in the past 1-2 years. Like I said this truck is a spare so it just sits.