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Need help 97 379 Pete speedo problem

Discussion in 'Peterbilt Forum' started by Zseverns, Mar 2, 2014.

  1. Mar 2, 2014 #1
    Zseverns

    Zseverns Bobtail Member

    1
    0
    Mar 1, 2014
    0
    I have 1997 Pete 379 with a Detroit that the speedo isn't working. Already replaced the sensor on the transmission and the speedo head but it still will not work. What else is there that would cause it not to work.
     
    Zseverns, Mar 2, 2014
    Zseverns, Mar 2, 2014
    #1
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  3. Mar 2, 2014 #2
    Passin Thru

    Passin Thru Road Train Member

    1,918
    565
    Mar 8, 2007
    VA
    0
    Broken wire. Bad ground.
     
    Passin Thru, Mar 2, 2014
    Passin Thru, Mar 2, 2014
    #2
  4. Mar 3, 2014 #3
    snowdrifter

    snowdrifter Bobtail Member

    4
    0
    Mar 2, 2014
    0
    Check your DATA Harness firewall to cab Warning disconnect batteries before disconnecting the plug you do not want to power surge the ECM...
     
    snowdrifter, Mar 3, 2014
    snowdrifter, Mar 3, 2014
    #3
  5. Mar 3, 2014 #4
    TwinStickPeterbilt

    TwinStickPeterbilt Heavy Load Member

    707
    910
    Mar 16, 2013
    0
    Time to get a new speedometer. I went through 7 on a 2000 Peterbilt 379EXHD. I'd look down and she'd just quit working.
     
    TwinStickPeterbilt, Mar 3, 2014
    TwinStickPeterbilt, Mar 3, 2014
    #4
  7. May 4, 2014 #5
    generallee

    generallee Medium Load Member

    512
    441
    Jan 4, 2014
    0
    Mine quit the other day on an 03 379EXHD. 5 minutes later it started working again. Been fine so far. Anything in particular I should at when it quits and starts working again. The wiring issue mentioned here seems to make sense. Anywhere in particular I should check for this?
     
    generallee, May 4, 2014
    generallee, May 4, 2014
    #5
  8. May 13, 2014 #6
    Excorcist1

    Excorcist1 Light Load Member

    222
    39
    Jan 11, 2012
    Chestertown, MD
    0
    I had exactly the same thing happening with the 07 386. It usually starts reading after I get over 30mph. But it's acting worse.
     
    Excorcist1, May 13, 2014
    Excorcist1, May 13, 2014
    #6
  9. Jun 10, 2014 #7
    OldPete379

    OldPete379 Bobtail Member

    17
    6
    Feb 18, 2014
    0
    The plug on the back of the speedo unplug it and take a small flathead screwdriver and spread male connections open slightly. Ive done that a time or two on my 98 and worked fine again.
     
    OldPete379, Jun 10, 2014
    OldPete379, Jun 10, 2014
    #7
  10. Mar 13, 2019 #8
    Auto hauling

    Auto hauling Bobtail Member

    9
    1
    Aug 28, 2018
    Chicago
    0
    How can I trace Speedo sensor wires between the sensor and ecm on 2004 Pete 379 cat c15
    Thank you
     
    Auto hauling, Mar 13, 2019
    Auto hauling, Mar 13, 2019
    #8
  11. Aug 25, 2022 #10
    angelina

    angelina Bobtail Member

    1
    0
    Aug 25, 2022
    0
    Hello! Please need a help
    I have Peterbilt 379 1998 , i just checked it's show me that the speed sensor falls ,
    I'm trying to buy a new sensor , but i don't know exactly what kind i need to buy , how many speed sensor have in Peterbilt 379 1998? and where is located all 4 speed sensor.
    Please any advise
     
    angelina, Aug 25, 2022
    angelina, Aug 25, 2022
    #10
  12. Aug 25, 2022 #10
    Big Road Skateboard

    Big Road Skateboard Road Train Member

    5,695
    29,704
    May 2, 2021
    0
    Tailshaft of trans. It'll either be single lead or 2 lead.
     
    Big Road Skateboard, Aug 25, 2022
    Big Road Skateboard, Aug 25, 2022
    #10
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