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Re: Paccar MX13 P3770
Posted to HD/Fleet Forum on 5/11/2020

If you havnt looked into the jumper harness on the DPF, open it up. I have found corrossion in the splices of that harness before. Two wires into one splice., poor seal and green death. Dont replace alot of controllers, alot of wiring issues. Login to read more.