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Peterbilt cruise problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by KittyKicker, Mar 4, 2020.

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  1. Mar 4, 2020 #1
    KittyKicker

    KittyKicker Light Load Member

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    Dec 27, 2015
    0
    I have a 2015 389 glider. The "set" position on the cruise control keeps cutting out. Resume works, jake brake works, brake lights are not on, brake switches are all new. I can hit resume and it will automatically go back to the last speed it was set at. It will go to high idle with the brake set but I cannot dial it down. It will turn off if I tap the clutch pedal going down the road. The cruise switch is new, so is the clutch switch. The heck is going on?
     
    KittyKicker, Mar 4, 2020
    KittyKicker, Mar 4, 2020
    #1
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  3. Mar 4, 2020 #2
    pushbroom

    pushbroom Road Train Member

    1,769
    7,204
    Sep 1, 2012
    0
    Gotta hook up to the ecm and monitor the cruise switch input to see whats hapeneing.
    Worked good before and just happened or has never worked right? Datalinked cruise or hardwired? Engine?
     
    pushbroom, Mar 4, 2020
    pushbroom, Mar 4, 2020
    #2
    Oxbow, Goodysnap, spsauerland and 1 other person Thank this.
  4. Mar 5, 2020 #3
    KittyKicker

    KittyKicker Light Load Member

    196
    100
    Dec 27, 2015
    0
    It has worked before. It kinda acted up this way before and I switched out the dash switch. It has been acting fine for a while but now it's being intermittent again. It has a Detroit. I'm not sure how the data link is wired, it's a Fitzgerald truck so however they do it...
     
    KittyKicker, Mar 5, 2020
    KittyKicker, Mar 5, 2020
    #3
  6. Mar 26, 2020 #5
    Orangepete75

    Orangepete75 Bobtail Member

    5
    0
    Jun 7, 2019
    0
    I have the same problem. Same truck too, 2015 Fitzgerald Pete 389. Some days it works fine, others not so much. Seems to be wet or damp days give me the most issues. We’ve replaced the clutch switch, dash switch,....thinking something may be wrong in the wiring harness. It’s really getting frustrating.
     
    Orangepete75, Mar 26, 2020
    Orangepete75, Mar 26, 2020
    #5
  8. Mar 26, 2020 #5
    boneebone

    boneebone Road Train Member

    2,232
    2,266
    Mar 13, 2009
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    Check the brake switch.
     
    boneebone, Mar 26, 2020
    boneebone, Mar 26, 2020
    #5
  9. Nov 1, 2021 #7
    Daledockery

    Daledockery Bobtail Member

    4
    0
    May 2, 2019
    0
    Any conclusions on this issue? I have a similar problem but worse. No cruise, jakes come on…..but literally seem to work only enough to slightly hear them. I can only feel the effects if I bobtail. 2nd stage seems weaker than 1st stage, and 3rd stage is still only a slight fraction of how 1st stage used to be. This happened after a motor swap. Same motor out of an identical truck with same setup. 2015 389 Fitzgerald Glider. 60 series Detroit. Motor blew, swapped em. Now no idle up, cruise, or usable Jakes. Any input is appreciated
     
    Daledockery, Nov 1, 2021
    Daledockery, Nov 1, 2021
    #7
  10. Nov 6, 2021 #7
    Trcknwolf

    Trcknwolf Light Load Member

    57
    27
    Nov 24, 2010
    Bellevue, NE
    0
    Not to worry, but all you guys that are having this common issue, its NOT just because you have a Fitzgerald truck. I've got a 1999 Pete 379 with a factory installed Detroit. The issue I've experienced, intermittently of course & for years, has been my truck won't idle up when I'm parked. I've replaced both dash switches, brake & clutch switches, main cab wiring harness, the dash jumper wiring, an ECM when the original one died, etc..etc, blah, blah, blah. All ECM parameters are "set" correctly. Nothing I've ever done has solved this "condition". I have just accepted this just a Peterbilt/Detroit thing.
     
    Trcknwolf, Nov 6, 2021
    Trcknwolf, Nov 6, 2021
    #7
  11. Nov 10, 2021 #8
    Tobytob

    Tobytob Light Load Member

    126
    140
    Aug 17, 2013
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    I have the same issue with a 2018 Pete with cummins x15. Problem just started a few weeks ago. Haven’t had time to replace the clutch switch. I’m going to try that then move to the dash switches. Hopefully one of them solves the problem. I really need my high idle in the winter.
     
    Tobytob, Nov 10, 2021
    Tobytob, Nov 10, 2021
    #8
    Oxbow Thanks this.
  12. Mar 7, 2022 #9
    Tooey005

    Tooey005 Bobtail Member

    2
    1
    Jan 28, 2018
    0
    Have a 2014 389 pete. Click cruise to high idle. Will go for a bit daytime running lights come one and off as well parking brake indicator light on dash. What could it be?
     
    Last edited: Mar 7, 2022
    Tooey005, Mar 7, 2022
    Tooey005, Mar 7, 2022
    #9
  13. Feb 15, 2023 #10
    SamsrjrAurorahernandez

    SamsrjrAurorahernandez Bobtail Member

    1
    0
    Feb 14, 2023
    0
    did you find issues
     
    SamsrjrAurorahernandez, Feb 15, 2023
    SamsrjrAurorahernandez, Feb 15, 2023
    #10
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