Started getting that code and figured it was a doser going bad. I wanted to try the cheapest option first though and that was the DEF filter that is on the def pump itself. Don't forget to change it as scheduled or you might be in the same spot or worse because it can burn up the pump itself and leave you derated. I do several things every year in January, new engine air filter, imaps sensor, air dryer, etc and now I'm adding this def filter because it's only about $20 on Amazon and ridiculously easy to change.
SPN 4364 FMI 31 Low conversion efficiency 2017 t680 with an isx15 cm2350
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by RunningAces, Jan 16, 2024.
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