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Turbo boost from 30 to 20 psi when mil light on

Discussion in 'Oilfield Trucking Forum' started by Fred75943, Aug 24, 2020.

  1. Aug 24, 2020 #1
    Fred75943

    Fred75943 Bobtail Member

    21
    1
    Oct 11, 2017
    0
    When I go up steep hills, sometimes mil light engine light and def light come on. After 40 miles, the engine light and def light go off, but mil light stays on. During this time the max boost is only 20 psi. About a day later, the mil light goes off and the boost is up to 30 psi again. Any suggestions?
     
    Fred75943, Aug 24, 2020
    Fred75943, Aug 24, 2020
    #1
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  3. Aug 24, 2020 #2
    Roberts450

    Roberts450 Road Train Member

    2,237
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    Feb 6, 2016
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    What make of engine and have you been able to get any codes from the dash??
     
    Roberts450, Aug 24, 2020
    Roberts450, Aug 24, 2020
    #2
  4. Aug 25, 2020 #3
    magoo68

    magoo68 Road Train Member

    3,393
    5,385
    Jun 11, 2011
    st malo mb canada
    0
    I’ve encountered the same thing it was a nox sensor that was borderline . It also threw the codes doing a manual burn. My guess is your truck is doing a passive burn and nox isn’t within parameters but after topping hill it falls back into parameters and has a derate until the next time it does a successful burn.. This is what my issue was on a DD15 truck .
     
    magoo68, Aug 25, 2020
    magoo68, Aug 25, 2020
    #3
    baha Thanks this.
  5. Aug 25, 2020 #4
    Cattleman84

    Cattleman84 Road Train Member

    9,894
    70,469
    Nov 1, 2017
    The Sticks, Idaho
    0
    I recently had a truck that wouldnt build boost above 20... It ended up getting a new cam and exhaust rockers. But once it started acting up it didnt come and go like yours does. Had to run it like that for 1000 or so miles to get it home to the shop.
     
    Cattleman84, Aug 25, 2020
    Cattleman84, Aug 25, 2020
    #4
  6. Aug 25, 2020 #6
    Fred75943

    Fred75943 Bobtail Member

    21
    1
    Oct 11, 2017
    0
    It’s a dd15 and it gives me the low nox conversion codes. I’ve replaced both nox sensors and the harness, put in awning kit, replaced filter, pump and doser. Still same problem. This has been happening for a year. I just go up the hills very slow and live with it. Actually, the boost comes back in a few hours, but takes a day for the mil light to go off.
     
    Last edited: Aug 25, 2020
    Fred75943, Aug 25, 2020
    Fred75943, Aug 25, 2020
    #6
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