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379 / c-15 cruise control shuts off

Discussion in 'Peterbilt Forum' started by dtavares, May 12, 2011.

Page 1 of 2
  1. May 12, 2011 #1
    dtavares

    dtavares Bobtail Member

    1
    0
    May 12, 2011
    Mississauga, Ontario
    0
    We have a 2000 Pete 379 with a c-15 cat 6nz series and while running down the road or sitting still with the cruise set, it will shutt off on it's own. We have tried a wiggle test & even timed it. There doesn't seem to be any consistency to this fault. No engine codes and cruise will turn off when prompted via switch, clutch or brake pedal. I'm all ears, any ideas?
     
    dtavares, May 12, 2011
    dtavares, May 12, 2011
    #1
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  3. May 13, 2011 #2
    Krooser

    Krooser Road Train Member

    2,493
    1,066
    Jul 25, 2010
    Wisconsin
    0
    Just a snafu... mine does the same on occasion. My dealer said it may take 1 hour to fix or 10 hours... I put up with it and lately it's been trouble free.
     
    Krooser, May 13, 2011
    Krooser, May 13, 2011
    #2
  4. May 13, 2011 #3
    cubiehri

    cubiehri Bobtail Member

    22
    10
    Dec 18, 2009
    western iowa
    0
    check all your grounds, peterbilt is a ground based system so any time you have a problem like this there is a good chance it is a ground or a broken wire
     
    cubiehri, May 13, 2011
    cubiehri, May 13, 2011
    #3
  5. May 13, 2011 #4
    Bent Wrench

    Bent Wrench Medium Load Member

    588
    205
    Aug 11, 2009
    Cornholio, OR
    0
    Check clutch switch and brake light switch for adequate freeplay?

    Not sure how they interface it with the PCM....
     
    Bent Wrench, May 13, 2011
    Bent Wrench, May 13, 2011
    #4
    jr-transport Thanks this.
  7. May 15, 2011 #5
    Krooser

    Krooser Road Train Member

    2,493
    1,066
    Jul 25, 2010
    Wisconsin
    0
    I usually just shut mine off for some time and when I turn it on it works fine again.
     
    Krooser, May 15, 2011
    Krooser, May 15, 2011
    #5
  8. Jul 12, 2011 #6
    rock8102

    rock8102 Bobtail Member

    4
    1
    Jul 4, 2011
    NJ
    0
    make sure your floormmat or nothing else gets stuck under brake pedal, this will disengage the cruise control just like if you hit the brake pedal or clutch
     
    rock8102, Jul 12, 2011
    rock8102, Jul 12, 2011
    #6
  9. Jul 12, 2011 #7
    Trckdrvr

    Trckdrvr Heavy Load Member

    742
    621
    Dec 25, 2010
    Georgia
    0
    Agreed, pedal adjustment on the switch..Try putting foot under pedal going down road.
    My cruise would shut off if i hit a bump..couldnt figure out why until i tried that.
    finally figured it out and had pedal/switch adjusted..fixed it.
    Good luck.
     
    Trckdrvr, Jul 12, 2011
    Trckdrvr, Jul 12, 2011
    #7
  10. Jul 13, 2011 #8
    paul 1052

    paul 1052 Heavy Load Member

    899
    346
    Oct 9, 2010
    Sand Springs, Ok.
    0
    Last time mine did that it was a bad trailer ground momentarily turning the brake lights on.
     
    paul 1052, Jul 13, 2011
    paul 1052, Jul 13, 2011
    #8
  11. Jul 13, 2011 #9
    yellowblood

    yellowblood Bobtail Member

    6
    1
    Jul 13, 2011
    Plain City, Ohio
    0
    Clutch switch most likely place.It is a micro switch which is very sensitive. It is switched on/off any time you are in cruise or idling the engines ECM thinks you pressed the clutch in and will kick out of cruise or idle. Located undercab where clutch pedal goes through floor.
     
    yellowblood, Jul 13, 2011
    yellowblood, Jul 13, 2011
    #9
  12. Dec 23, 2011 #10
    leo319

    leo319 Light Load Member

    66
    7
    Jul 13, 2011
    monterey bay, ca
    0
    where is the brake switch? cant find! 95 pete 379
     
    leo319, Dec 23, 2011
    leo319, Dec 23, 2011
    #10
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