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15 prostar Cummins isx high idle

Discussion in 'Trucks [ Eighteen Wheelers ]' started by uncle tank, Feb 23, 2020.

  1. Feb 23, 2020 #1
    uncle tank

    uncle tank Bobtail Member

    27
    2
    Apr 17, 2016
    0
    Left house today and went 90 miles to pickup. Put truck in neutral but it wouldn’t hobbled down below 800 RPM no lights. Except for hot exhaust light and smells like it’s doing a regen. Anyone ever deal with this. 15 Cummins isx
     
    uncle tank, Feb 23, 2020
    uncle tank, Feb 23, 2020
    #1
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  3. Jun 5, 2021 #3
    One Bad Apple

    One Bad Apple Bobtail Member

    16
    4
    Sep 13, 2016
    0
    I believe it’s just a passive regen unless it is stays in that mode most of the day. I’m having this issue now bigtime!! How did you fix it?
     
    One Bad Apple, Jun 5, 2021
    One Bad Apple, Jun 5, 2021
    #3
  4. Dec 6, 2022 #4
    Timary Enterprizes

    Timary Enterprizes Bobtail Member

    1
    0
    Dec 6, 2022
    0
    Did you figure out what it was mine just did same thing won't idle down below 800
     
    Timary Enterprizes, Dec 6, 2022
    Timary Enterprizes, Dec 6, 2022
    #4
  5. Dec 6, 2022 #4
    flood

    flood Road Train Member

    4,029
    3,768
    Dec 25, 2010
    0
    this is normal.... the truck was doing a rolling regen when you stopped. It wants to finish the regen but after it sits for about 10-15 min the idle will drop back to normal and a few min later the high temp light will go out....
     
    flood, Dec 6, 2022
    flood, Dec 6, 2022
    #4
    Heavyd Thanks this.
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