2018 Peterbilt 579, J 1939 code periodically comes up on data link?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Chuck579, Jan 25, 2023.

  1. Chuck579

    Chuck579 Light Load Member

    Jun 29, 2021
    2018 Peterbilt 579 issue.
    I’m getting several fault codes, but J1939 has periodically popped up. Dealer said could be wiring harness. I’m wondering what the cost of these are as Dealer said they’re a pretty penny. I have it at the local Peterbilt dealer now.
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  3. Inderjit

    Inderjit Medium Load Member

    Sep 17, 2017
    There is a good chance that the harness is wearing against something and one of the data link wires is intermittently shorting to ground. I would start by inspecting the harness and making sure its tied up securely. Replacing the harness would be very labour intensive. The labour cost would exceed the cost of the harness.
    Could you post what the faults were?
  4. Tigerfishinc

    Tigerfishinc Light Load Member

    May 28, 2021
    J1939 is the communication protocol- are you using insite? How you’re getting those codes?
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