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What is this taped to my OBD port? 2021 Paccar

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Deezl Smoke, Jun 15, 2025.

Page 2 of 2
  1. Jun 16, 2025 #11
    Antinomian

    Antinomian Road Train Member

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    There shouldn't be any current in that circuit when the key is off.
     
    Antinomian, Jun 16, 2025
    Antinomian, Jun 16, 2025
    #11
    Deezl Smoke Thanks this.
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  3. Jun 16, 2025 #12
    Deezl Smoke

    Deezl Smoke Medium Load Member

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    Feb 12, 2011
    Hillsboro Oregon
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    I'm going to untape it today and get a better look. But that tag in the picture is on one of the wires. A terminal resistor of some sort.
    I'm wondering if the previous owner had some sort of defeat device plugged in while driving and that's what caused the discolored pins. ???
    I know the emissions are intact and operating as it was under warranty when I bought it and had to take it to Cummins NW for warranty work.
     
    Deezl Smoke, Jun 16, 2025
    Deezl Smoke, Jun 16, 2025
    #12
  4. Jun 16, 2025 #13
    Lazer

    Lazer Road Train Member

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    The last place I worked before retirement, had a fleet of trucks that used ‘Big Road’. Every truck had a transponder thingy, that stayed plugged into the OBD port 24/7. Don’t recall ever seeing one with overheated prongs.
     
    Lazer, Jun 16, 2025
    Lazer, Jun 16, 2025
    #13
  5. Jun 16, 2025 #14
    Goodysnap

    Goodysnap Road Train Member

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    You need to install the ELD to the truck at the RP1226 connector per the Paccar aftermarket device manual. Not per the ELD instructions. If I had a dollar for every time I removed an mis- installed ELD causing communication errors and intermittent component function I could retire.

    Do not plug ELD or logger devices directly into the 9 Pin!!!!

    Especially on anything 2020 and newer.

    And that blue connector appears to be a terminating resistor for the diagnostic CAN and that is a factory Paccar wiring label.
     
    Goodysnap, Jun 16, 2025
    Goodysnap, Jun 16, 2025
    #14
    High Stepper, Sirscrapntruckalot, Deezl Smoke and 1 other person Thank this.
  7. Jun 16, 2025 #15
    Deezl Smoke

    Deezl Smoke Medium Load Member

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    Feb 12, 2011
    Hillsboro Oregon
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    That's exactly what it is.
    I need to get some good pictures and post of the wiring just an inch behind the port. I can't believe that Paccar made those connections, but we'll see. They are shrink tubed in black.
     
    Deezl Smoke, Jun 16, 2025
    Deezl Smoke, Jun 16, 2025
    #15
  8. Jun 17, 2025 #16
    Goodysnap

    Goodysnap Road Train Member

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    Bodybuilder manuals are available to public for Peterbilt and Kenworth website respectively. Search RP1226 in your bodybuilder manual for connector views and locations for making 3rd party device connections.

    Part number PP207233 is available for plug and play connections from 9pin device to RP1226. No splicing......
     
    Goodysnap, Jun 17, 2025
    Goodysnap, Jun 17, 2025
    #16
    Deezl Smoke Thanks this.
  9. Jun 17, 2025 #17
    Deezl Smoke

    Deezl Smoke Medium Load Member

    494
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    Feb 12, 2011
    Hillsboro Oregon
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    Awesome. Thank you for sharing that.
     
    Deezl Smoke, Jun 17, 2025
    Deezl Smoke, Jun 17, 2025
    #17
    Goodysnap Thanks this.
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