06 w900 speedometer jumping all over

Discussion in 'Kenworth Forum' started by abtrucker, Feb 11, 2014.

  1. Rocket30

    Rocket30 Bobtail Member

    3
    0
    May 16, 2014
    Perth Western Australia
    0
    I've just had this problem rectified, my speedo would jump around @100kph, Kenworth found a ground fault in the wiring loom on the motor. (C15)
     
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  3. kwcam

    kwcam Light Load Member

    179
    137
    Dec 29, 2012
    at the shop
    0
    We will run new shielded wiring from the trans speed sensor to the ecm, this has fixed this issue in the past. if the old wiring shorts to ground or some times picks up interference from laying next to oil and air lines it makes the speedo jump as when parked and doing a range shift will do
     
  4. abtrucker

    abtrucker Light Load Member

    131
    30
    Oct 23, 2011
    Alberta
    0
    My issue is fixed. I removed the harness, And inspected the wires for chaffing or pinches and found none. I checked the resistance on both wires while jiggling the harness to see if there were any shorts/breaks and found none.
    The last two feet of the harness closest to the speed sensor were not a twisted pair like the rest of the harness, so I twisted them. Reinstalled the harness and have not had any issues in the last 700 miles.
     
  5. Rubberens

    Rubberens Bobtail Member

    40
    2
    Dec 6, 2017
    0
    Im having same problem changed sensor checked wires thight yoke nit, my needle froze over 80 and when the trucks running in neutral the miles keep rolling and im not even driving 3406 e cat 95 kw t600
     
  6. Heer209

    Heer209 Bobtail Member

    2
    2
    Jul 29, 2021
    0
    My speedometer was jumping, after reading your answer I checked for play in driveshaft, It was clunking up and down with noticable play. After getting it tightened the vibration went away and speedometer and cruise control work perfectly. Thanks to your post
     
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  7. Heer209

    Heer209 Bobtail Member

    2
    2
    Jul 29, 2021
    0
    You were right my yoke nut was loose, too much play in driveshaft. After getting it tightened the vibration went away and speedometer and cruise worked perfectly. Thanks for your help.
     
    Vampire Thanks this.
  8. Caterpillar Cowboy

    Caterpillar Cowboy Heavy Load Member

    837
    602
    Nov 11, 2010
    Wyoming
    0
    The more and more I work on trucks, the more I use red locktite!
     
    Vampire, jamespmack and w9l Thank this.
  9. Mach

    Mach Light Load Member

    155
    78
    Nov 19, 2017
    Knoxville Tennessee
    0
    Hey man did the yoke nut fix your issue? My truck is doing the same thing. Speedo kept jumping around and getting stuck at 90mph. Once I realized I couldnt change my duty status, I shut the truck off with the needle at 90 mph. But then when I turned the key to restart the truck, the needle went further and is now stuck on the trip reset button. Haven't tired driving yet and don't know if I need to be dropping the drive shaft to try tightening this nut
     
    Vampire Thanks this.
  10. Tickle1012

    Tickle1012 Bobtail Member

    2
    0
    Apr 19, 2022
    0
    Did u figure this out mine is doing the exact same thing with new speed sensors and speedometer?
     
  11. Tickle1012

    Tickle1012 Bobtail Member

    2
    0
    Apr 19, 2022
    0
    Did you ever figure this out mine is doing the exact same thing and I’ve replaced sensors and speedometer
     
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