Cummins isx 15 CM2250 silent derate

[Unilevers]

(03-09-2020 )krowbar91 Wrote:  Thanks for the comments. DOC and DPF have been completely gutted. SCR has not been touched. Truck has operated for 25,000 miles with no problems until exhaust leak was fixed on DPF and PM was performed. I have also ran truck at operating temp, idled for 1 minute then driven truck on the road. Code still stays inactive and truck derated even after reset from insite. My question is being that system has been gutted does the turbo not recognize any back pressure which trips this code???? Took truck back to shop that did the original programming for delete and was advised that software and calibrations were good.

honestly there are so many things wrong with what you said i dont know where to start. you cannot have a SCR it will not work for very long. You most likely have bad programming that caused a physical issue, or bad programming that is the issue or just bad programming with a physical issue with a delete done poorly and improper. 25000 miles? thats nothing, it dam well better run longer than that - and its having a issue right now. Your tuning shop is clueless aswell. I think you need to reevaluate your situation.

diesels run best with zero backpressure - it doesnt need any of it. it would be best if you had a pipe directly out the side of your hood, but the air police would get cranky about that. The exhaust leak was probably letting it breath enough to not code up.

Good luck, your gonna need it