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Re: Paccar MX13 P3901
Posted to HD/Fleet Forum on 2/23/2021 3 Replies

Year a so ago I had an ISB 6.7 giving me fits. Don't recall exact details but your issue sounds familiar. It kept setting DEF SCR codes. Went the same route checked all the wiring etc. Finally tried a used pump module that I had from a contamination repair. Pl... Login to read more.

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