C15 derate

Discussion in 'Trucks [ Eighteen Wheelers ]' started by davis584, Aug 7, 2018.

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  1. Aug 7, 2018 #1
    davis584

    davis584 Bobtail Member

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    Aug 7, 2018
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    As the title says I have a C15 acert (05 379) with a single turbo conversion. I bought the truck with the work already done. I got about 15,000 miles out of it before it started to derate on climbs when hooked to a trailer.(won't seem to do it bobtail) you will be pulling a hill all is good and boost suddenly drops from roughly 40psi to around 25. The check engine light comes on but seems to flicker off at times. I did manage to have it read and was told low back pressure was the code and I likely needed a tune? Is this correct? Did they convert without a tune? Could it be anything else? Thanks! Jason
     
    davis584, Aug 7, 2018
    davis584, Aug 7, 2018
    #1
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  3. Aug 7, 2018 #2
    davis584

    davis584 Bobtail Member

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    Aug 7, 2018
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    I forgot to mention it will say derated until you shut it down and restart it. Then it will run fine until you need a steady amount of higher boost.
     
    davis584, Aug 7, 2018
    davis584, Aug 7, 2018
    #2
  4. Aug 7, 2018 #3
    sego4

    sego4 Bobtail Member

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    Aug 5, 2018
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    I purchased a 2006 From a known dealer in Amarillo a year ago, same engine. Same problem. Replaced every sensor on it, in and out of dealerships, no one could find problem. Decided to install 6 pack injectors, was looking at air to air boots, saw a black spot on one, rubbed it and it was cracked about an inch and a half!!! the metal ring was in the crack and you couldn't tell until you pushed it! Inspect all 4 air to air rubber boots. Also check Turbo Boost Sensor, The plug becomes brittle w/ Heat and age.
     
    Last edited by a moderator: Aug 7, 2018
    sego4, Aug 7, 2018
    sego4, Aug 7, 2018
    #3
    Oxbow and Oldironfan Thank this.
  5. Aug 7, 2018 #4
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Sure sounds like a VVA fault. Have you pulled the flash code?
     
    spsauerland, Aug 7, 2018
    spsauerland, Aug 7, 2018
    #4
    Oxbow, SAR and wore out Thank this.
  7. Aug 7, 2018 #5
    davis584

    davis584 Bobtail Member

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    Aug 7, 2018
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    It clears as soon as you shut it off so no flash codes
     
    davis584, Aug 7, 2018
    davis584, Aug 7, 2018
    #5
  8. Aug 7, 2018 #6
    Oldironfan

    Oldironfan Road Train Member

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    You really need to check for boost leaks. Codes should be stored in ecm.
     
    Oldironfan, Aug 7, 2018
    Oldironfan, Aug 7, 2018
    #6
  9. Aug 7, 2018 #7
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Next time, don't shut it off and pull flash code when CEL is on. Just guessing til then.
     
    spsauerland, Aug 7, 2018
    spsauerland, Aug 7, 2018
    #7
    wore out, Oxbow, drdesl and 1 other person Thank this.
  10. Sep 13, 2018 #8
    spindrift

    spindrift Road Train Member

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    Update?
     
    spindrift, Sep 13, 2018
    spindrift, Sep 13, 2018
    #8
    Oxbow Thanks this.
  11. Sep 23, 2018 #10
    Ruiz1

    Ruiz1 Bobtail Member

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    Sep 23, 2018
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    I get a code 95 when running. If I shut it down it clears and has no history of fault. Have replaced the Ivr sensor and selenoid on passenger side of engine. Still blinks code when pulling a trailer not bobtailing?
     
    Ruiz1, Sep 23, 2018
    Ruiz1, Sep 23, 2018
    #10
  12. Sep 23, 2018 #10
    Ruiz1

    Ruiz1 Bobtail Member

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    Sep 23, 2018
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    Did you get it figured out?? Mine is doing the same. 05 MXS
     
    Ruiz1, Sep 23, 2018
    Ruiz1, Sep 23, 2018
    #10
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