Advice, Reocurring Chk Eng Lgt & DDEC Report Issues w Frlnr Casc

Discussion in 'Ask An Owner Operator' started by 3lopezgene, Feb 20, 2024.

  1. 3lopezgene

    3lopezgene Bobtail Member

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    Dec 8, 2023
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    Hi everyone,

    I'm reaching out to the community for some advice and guidance regarding an ongoing issue I've been facing with my 2019 Freightliner Cascadia, equipped with a DD13 engine and DT12 transmission. I bought this semi-truck from Select Truck of Houston with 234,000 miles on it. It seemed well-maintained at the time of purchase. However, I've encountered a recurring problem that I'm hoping to get some insights on.

    While driving from Houston to Odessa, where I plan to work hauling fracked sand, the truck threw a check engine light and a fault code related to the after treatment system (520372). After resting for the night, I found the truck derated to 5 mph the next morning. I took it to a Freightliner dealer in Odessa, and they identified an issue with a nox sensor. The repair was covered under the $13,000 warranty I had purchased for two years. Three days post-repair, the check engine light appeared again. The truck was in the shop for two days before I got it back. However, four days later, the check engine light came back on, and now the truck is back at the dealer.

    During their diagnostics, they pulled DDEC report and found idle percentage at 78% life to date. I'm not entirely sure what my next steps should be and am looking for advice on how to proceed. I am feeling they sold me a lemon at Select truck of Houston. The truck has a 90 days buyer assurance warranty and a basic and max Freightliner warranty for 2 years/250K miles.

    Has anyone here experienced something similar with their truck? How did you resolve it? Any advice on dealing with the dealership? Also, how concerning is the idle time at 78% in the DDEC report? I'm relatively new to this and greatly appreciate any insights or guidance you can offer. Should I be patient until the issue is resolved under warranty or should I be worry about probably had gotten a lemon truck?

    Thank you in advance for your help!
     
    Last edited: Feb 20, 2024
    Reason for edit: Adding the fault codes.
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  3. Espressolane

    Espressolane Road Train Member

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    Does or did this have a PTO installed? Could account for the high idle time. It would have been running a pump/blower or some type of similar system.

    My guess is that it has never had an emissions system service. Cleaning the DPF and SCR units.
    It is required maintenance. Check the maintenance manual for more info. Idle time is a killer on these emissions systems.

    On the NOx sensor, look for an electrical problem. Wire harness are notorious for problems.
     
  4. 3lopezgene

    3lopezgene Bobtail Member

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    Dec 8, 2023
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    Thanks for the quick reply man. I have owned the truck for less than a month, no PTO, It looks like just simple idling. The truck is under 90 days buyer assurance warranty from freightliner and I purchased 2 years/250K basic and max warranty from freightliner as well my concern is about how to handle the case, I have not owned the truck for a month yet and is giving me issues and very unwanted downtime.
     
  5. uncleal13

    uncleal13 Road Train Member

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    You should be able to tell us the codes that come up when the light is on. There is a selection in the dash menu to display active faults.
     
  6. 3lopezgene

    3lopezgene Bobtail Member

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    Dec 8, 2023
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    The code is (520372) thanks for replying.
     
  7. Siinman

    Siinman Road Train Member

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    Kansas City, MO.
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    From owning a used truck I would replace all the sensors for emissions right off the bat. That many hours on idle time should had been seen before you bought the truck. Did you not get a ECM dump done and find out what all has been done to the truck? For sure will need to clean the DPF and SCR.
     
  8. 3lopezgene

    3lopezgene Bobtail Member

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    Dec 8, 2023
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    No I did not. Newbie mistake I guess, whats done is done, I am looking for solutions and guidance on how to proceed from now on. Is this situation common? How this high idling time affects the truck reliability other than the dpf system? I am hoping the dealer will replace whats causing the issue. Do semi trucks have something as a lemon law?
     
  9. 062

    062 Road Train Member

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    Need to know what the last part of the code is. You have a spn 520372 there is a two digit fmi behind it.
    Spn 520372 fmi 16 is scr closed loop.
    I would be pushing them to install a new one box or give them the truck back, if that’s the code you have.
     
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  10. Ridgeline

    Ridgeline Road Train Member

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    Michigan
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    Yeah, there are hundreds of posts about how to buy a truck on this site, just an FYI.

    An ECM dump may have allowed you to catch this before you bought it.

    As 062 mentioned, there are two more numbers after the SPN number, this drills down to the problem.

    DD has at least one service bulletin out on the error so here it is -

    https://static.nhtsa.gov/odi/tsbs/2016/MC-10130349-9999.pdf

    I would also get a FULL ECM dump while they have the computer hooked up to the truck to see what else is going on.
     
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  11. uncleal13

    uncleal13 Road Train Member

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    Humboldt, Sk
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    78% idle time is a lot. I had 50% on mine hauling grain, I sat in sometimes three hour line ups and moved every ten minutes. But I still shut off the truck at night.
    Your truck must have ran all night long.
    So given the miles plus the hours: there is a fair chance that the One-Box is worn out, the SCR catalyst does wear down over time and it is not replaceable, the whole emissions box has to be changed.
    If could still be other issues, unfortunately you need to find a reliable dealer to take a proper look at it. Most are in a rush and as soon as they find the smallest issue they, quit and move on to the next truck without looking into what else up the stream may have led to the issue they find.
     
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