Just tossing ideas at the wall...
It takes two values to compute a percentage. Did you check/change the NOX input sensor as well as the output sensor?
You might try opening the one box to see if the DEF mixing tubes have burned through.
There is a test in the DDDL software that makes the DEF pump run for a fixed time in order to measure if it's working right. You have to disconnect the line and hold it in a graduated cylinder to measure how much fluid gets pumped.
Have you refilled the DEF tank after this all started happening? DEF is water soluble and you can get diluted DEF fluid sometimes. Try boxed DEF for a while and see if that helps. You can test the DEF quality in your tank with a DEF Refractometer.
Is the DEF feed line heater working?
14 cascadia. 4 codes. Nox, poor def, derate
Discussion in 'Freightliner Forum' started by irishluck09, Mar 24, 2021.
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Ill touch more on your response here later but for a quick reply, i did not change the input. Just output. And yes i have filled the DEF tank many times since this issue. I still run 2000-3000 miles a week. Just have to do a forced/manual regen on the highway every couple days when the codes pop up. I get derated to 55mph and after the regen its back to normal for a couple days -
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QUALITYTRUCK Thanks this.
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i have brand new 1 box for this truck sitting in my garage. selling cheap $6000 cash
AlexD13 Thanks this. -
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