DEF PROBLEM

Discussion in 'Freightliner Forum' started by 294dave, Jul 18, 2020.

  1. SWM_TECH

    SWM_TECH Light Load Member

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    Apr 15, 2018
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    uncleal13 already gave the explanation of codes but here's the diagnostic steps for the faults. Low NOx efficiency is what needs diagnosed first. Needs to be done with the diagnostic software but reading through the steps might help understand the process.
     

    Attached Files:

    Last edited: Jul 22, 2020
    Reason for edit: Miss spelling
    294dave, QUALITYTRUCK and uncleal13 Thank this.
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  3. maujpuria1860

    maujpuria1860 Bobtail Member

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    Jul 31, 2020
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    Hi there. i drive 2013 cascadia dd15. recently i had check engine light on which turns into solid light after sometime. goes and comes back after few days. took truck to detroit diesel dealership and this was the diagnose" TRUCK AS CODE 4364/18 SCR NOX CONVERSION LOW. TROUBLESHOOT LEADS TO DEF BLADDER NOT HOLDING AIR, SCHREADER VAVLE IS LEAKING, REPLACED BLADDER,AIR UP BLADDER AND CONTINUE TO TROUBLESHOOT. DOSER FLOW IS 125 ML BOTH NOX SENSORS PASS TEST SCR TEMP IS OUT OF SPEC TROUBLESHOOTING LEADS TO REPLACEMENT OF 1 BOX. MY QUESTION IS THAT REALLY I NEED A ONE BOX OR IS THERE SOMETHING ELSE DEALERSHIP MISSED. TRUCK IS RUNNING OK FOR NOW. DEALER ALSO MENTIONED THAT REGEN IS NOT REACHING OPTIMUM TEMPERATURE AND EFFICIENCY IS ONLY 25% RIGHT NOW
     
  4. 757Trucker

    757Trucker Bobtail Member

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    Feb 2, 2014
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    I changed #### near every part of my DEF system and once i change the ACM harness the light never came back on
     
  5. Bobsmith345

    Bobsmith345 Bobtail Member

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    Dec 17, 2020
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    Do you remember what shot you took it to? Pm me if you want.
     
  6. Birdman 008

    Birdman 008 Bobtail Member

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    Apr 10, 2021
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    Use pittsburgh power max mileage gets rid of the codes on after treatment
     
  7. Birdman 008

    Birdman 008 Bobtail Member

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    Apr 10, 2021
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  8. Birdman 008

    Birdman 008 Bobtail Member

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    Apr 10, 2021
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    Sorry didn't know it was posting lol. But that max mileage works I promise. Less regens now just look it up. I run it and will always run it . It makes exhaust burn hotter through the dpf system and slowly cleans it
     
  9. Birdman 008

    Birdman 008 Bobtail Member

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    Apr 10, 2021
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    That code is gone since I started using it
     
  10. fuel concierge

    fuel concierge Bobtail Member

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    Dec 18, 2020
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    Please help. Lol. Just got this truck
    2014 Cascadia automatic truck runs fine has all this issues on computer
    Can u please help me evaluate repair
     

    Attached Files:

  11. fuel concierge

    fuel concierge Bobtail Member

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    Dec 18, 2020
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    By the way when I bought truck it had no codes my yard guys ran it out of def twice and ran truck in yard at 5mph and it would turn off. I refilled started and moved with no problems. Mechanic came installed computer and all that mess came up
     
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