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Speed sensor keeps failing randomly

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Volvo_780, Dec 16, 2022.

  1. Dec 16, 2022 #1
    Volvo_780

    Volvo_780 Bobtail Member

    26
    2
    Feb 22, 2021
    0
    I have 2011 mack cxu613 deleted having this issue my spend stops working cruise stops working and engine break stops working randomly if I turn the truck off everything goes back to normal within 10 miles it fails again sometimes I can drive 50 miles I replaced speed sensor and still having the same issue need your help
     
    Volvo_780, Dec 16, 2022
    Volvo_780, Dec 16, 2022
    #1
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  3. Dec 16, 2022 #2
    '88K100

    '88K100 Road Train Member

    1,425
    3,290
    Aug 23, 2020
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    I dont know,,i have company truck, speedometer quit working so no governor working and odometer not keeping score. I assume bad connection on mine since originally speedo would quit on wet roads and come back on dry road.
     
    '88K100, Dec 16, 2022
    '88K100, Dec 16, 2022
    #2
    loudtom Thanks this.
  4. Dec 18, 2022 #3
    VWbeagle

    VWbeagle Bobtail Member

    17
    11
    Dec 21, 2016
    0
    We had a truck that had similar issues come through our shop. Turned out to being a tiny magnet from a speed sensor was stuck on the tone ring at the trans output. Every time the magnet would come around to the sensor it shut off cruise, throwing random codes.
     
    VWbeagle, Dec 18, 2022
    VWbeagle, Dec 18, 2022
    #3
    Coke driver Thanks this.
  5. Dec 19, 2022 #4
    Volvo_780

    Volvo_780 Bobtail Member

    26
    2
    Feb 22, 2021
    0
    Yeah replaced the speed sensor still having the same issue sometimes it just does it with the truck idling
     
    Volvo_780, Dec 19, 2022
    Volvo_780, Dec 19, 2022
    #4
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