2017 Peter 579 MX13 max derate def quality again...help?

Discussion in 'Peterbilt Forum' started by Arctic_fox, May 5, 2021.

  1. Arctic_fox

    Arctic_fox Medium Load Member

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    So here i sit yet again with a max derate on my new pete after yet another dealer claimed they fixed it, (8 and counting at this point) So far i have had the whole system pulled and cleaned by pete, replaced the quality sensor, doser, both nox sensors the SCR sensors, Soot can, Def filter, DPF filter, wireing harness, ECM, pump, cooler, ALL of the lines, injector, fuses, fuse box had the tank dropped and cleaned and then replaced with a new tank and had the whole ECM function tested. As well as all previous work double checked....twice.

    My warranty aggerate for the year is basically spent and i have poured almost $20K into this between tows, parts, and downtime even after warranty covering more then half of this mess.....i am at a total loss at this point. I dont even know what else there is left to check and even this latest pete dealer is flumixed and agast at my repair list. Does anyone have ANY advice on what can posibly be left to check at this point?
     
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  3. spsauerland

    spsauerland Road Train Member

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    Has DEF tank heat valve been replaced?
     
    pushbroom and QUALITYTRUCK Thank this.
  4. Goodysnap

    Goodysnap Road Train Member

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    These hard to trace intermittent problems almost always end up being hidden wiring rubs or shorts/opens.

    What faults you have that keep returning?
     
  5. Arctic_fox

    Arctic_fox Medium Load Member

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    Sorry for late reply it ended up derated again towed and got "fixed" then derated again just now. And its been a huge list. All related to SCR and def quality however.

    Lastest one is P3818. Also to add to replaced parts above. Def tank wireing harness. def tank heater valve, Coolant lines and computer dump and reprogram.
     
  6. Arctic_fox

    Arctic_fox Medium Load Member

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    Also at this point anyone know a good shop that can swap a 3406E or C15 for this paccrap MX13? If i can get this crap engine functional long enough to make some money i am going to run it until i have the money to remove it and take it to a range with 2000 pounds of tanerite and a .50 cal.... I would delete it but frankly considering how poor my luck is i would have a major breakdown the day after i do it and need a dealer to repair it.
     
  7. Arctic_fox

    Arctic_fox Medium Load Member

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    Sep 16, 2016
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    Another update. Peterbilt appleton "fixed" the issue after it went in again. Found my decomp pipe was incorrectly installed and cleaned the massive crystal buildup out then reinstalled it. Also did a full test on the aftertreatment harness and engine harness. No issues found. They then did 2 50 mile road tests amd a regen found everything in spec. Got 200 miles and boom max derate towed in yet again.
     
  8. Arctic_fox

    Arctic_fox Medium Load Member

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    Sep 16, 2016
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    @Goodysnap Went through all my bills and have a full list of codes thrown to date below including 1 off codes or ones that went away after parts replacments.

    P1482
    P1483
    p1485
    P1514
    P1516
    P1517
    P1518
    P151A
    P3818
    P3819
    P3822
    P3824
    P3830
    P3829
    P3945
    U1011

    There were a few more but i lost my paper i had them written down on.
     
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