Peterbilt 389 Speedometer issue

Discussion in 'Peterbilt Forum' started by Cg102447, Jun 15, 2021.

  1. Cg102447

    Cg102447 Bobtail Member

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    Having an issue with a speedometer on a 2015 389. speedometer has power and sweeps on initial key on but does not read speed. Both speed sensors are working correctly and wiring ohms out correctly to ECM.

    Any ideas?
     
    Cg102447, Jun 15, 2021
    #1
  2. Zmmdawg

    Zmmdawg Bobtail Member

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    Mine did the same. Then my Tachometer started showing false RPMs. Ended up being my cluster in the dash. Not cheap either
     
    Zmmdawg, Jun 15, 2021
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