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2018 579 low voltage disconnect

Discussion in 'Peterbilt Forum' started by Edjahman, May 19, 2020.

Page 1 of 2
  1. May 19, 2020 #1
    Edjahman

    Edjahman Medium Load Member

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    Could someone please tell me where the low voltage disconnect is on my 2018 Peterbilt 579?

    Could someone also please tell me how to disconnect it? I know the implications of doing that and I have the resources to get started again if I ran the batteries down too low.

    Thank you so much for your help, everyone.
     
    Edjahman, May 19, 2020
    Edjahman, May 19, 2020
    #1
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  3. May 19, 2020 #2
    062

    062 Road Train Member

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    062, May 19, 2020
    062, May 19, 2020
    #2
  4. May 19, 2020 #3
    pushbroom

    pushbroom Road Train Member

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    Last 6 of s/n

    It can have a cecu controlled disconnect in which case you can turn it off with ESA.
    It could also have a hardwired one that you can manually bypass
     
    pushbroom, May 19, 2020
    pushbroom, May 19, 2020
    #3
    spsauerland, 062 and QUALITYTRUCK Thank this.
  5. May 19, 2020 #4
    Edjahman

    Edjahman Medium Load Member

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    469663
     
    Edjahman, May 19, 2020
    Edjahman, May 19, 2020
    #4
  7. May 19, 2020 #5
    pushbroom

    pushbroom Road Train Member

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    It has a cecu controlled LVD. Need to swing by the dealer or someone with ESA and they can tun it off.

    iexplore_g6fZpdgK5g.jpg
     
    pushbroom, May 19, 2020
    pushbroom, May 19, 2020
    #5
    spsauerland, 062 and QUALITYTRUCK Thank this.
  8. May 19, 2020 #6
    Edjahman

    Edjahman Medium Load Member

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    OK thank you!
     
    Edjahman, May 19, 2020
    Edjahman, May 19, 2020
    #6
  9. May 20, 2020 #7
    Edjahman

    Edjahman Medium Load Member

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    So it has to be programmed out apparently.

    Do you know where the CECU would be located on a 2018 579 by any chance?

    I guess there's no other way to disable it from what you are saying?

    Thank you!
     
    Edjahman, May 20, 2020
    Edjahman, May 20, 2020
    #7
  10. May 20, 2020 #8
    pushbroom

    pushbroom Road Train Member

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    No there is no other way. It is a parameter inside the CECU. Cecu is located in the hotel at the lower kick panel between the two seats.
     
    pushbroom, May 20, 2020
    pushbroom, May 20, 2020
    #8
    spsauerland, Edjahman and 062 Thank this.
  11. May 20, 2020 #9
    Edjahman

    Edjahman Medium Load Member

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    OK thank you
     
    Edjahman, May 20, 2020
    Edjahman, May 20, 2020
    #9
  12. Feb 4, 2021 #10
    Roberts450

    Roberts450 Road Train Member

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    @pushbroom can you check to see if my LVD is CECU controlled or not. Vin 636140. Im having starting issues where it seems the power is getting cut to the starter or something as it dosent take but a minute maybe two at the most on jumper cables to get the truck to fire up. No slow cranking just hits hard then cuts to the click click click.
     
    Roberts450, Feb 4, 2021
    Roberts450, Feb 4, 2021
    #10
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