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T680 how does the analog tachometer work?

Discussion in 'Kenworth Forum' started by CuJT Pres., Sep 18, 2018.

  1. Sep 18, 2018 #1
    CuJT Pres.

    CuJT Pres. Bobtail Member

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    0
    Feb 15, 2018
    0
    Had truck in the shop had the DPF cleaned at 498k miles now at 500k plus so no more warranty, got the truck back and now the tach reads 450 with key off and 2000 at 65 mph actually 1250rpm.
    Called back to the shop and they said "nothing we did, would cause that"
    So is there a mechanical cable or is there electrical sesens going through ECM, that is causing this?
    Digital tachometer in driver info center is acuraccu but not the analog gauge.

    Any ideas?
     
    CuJT Pres., Sep 18, 2018
    CuJT Pres., Sep 18, 2018
    #1
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  3. Sep 18, 2018 #2
    boneebone

    boneebone Road Train Member

    2,234
    2,268
    Mar 13, 2009
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    There are sensors going to the tach, no cables.

    Check with your KW dealer, there's been alot of recalls on certain models regarding wiring harnesses.
     
    boneebone, Sep 18, 2018
    boneebone, Sep 18, 2018
    #2
  4. Nov 16, 2018 #4
    Hangryhazmat

    Hangryhazmat Bobtail Member

    4
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    Oct 24, 2018
    0
    [​IMG] I would like to know the same thing!! spent 60K on a truck and have to worry about little crap like this! freaking annoying. loaded up at a farm and turned the truck back on and BAM! instant annoyance
     
    Hangryhazmat, Nov 16, 2018
    Hangryhazmat, Nov 16, 2018
    #4
  5. Nov 18, 2018 #4
    pushbroom

    pushbroom Road Train Member

    1,769
    7,205
    Sep 1, 2012
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    Needs the Cecu/ IP reflashed. Then can get forgetful at times.
     
    pushbroom, Nov 18, 2018
    pushbroom, Nov 18, 2018
    #4
  6. Feb 17, 2022 #6
    lbarnson

    lbarnson Bobtail Member

    1
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    Feb 17, 2022
    0
    The 680 kenworth is a very expensive truck from wiring harness to after treatment seneners to much computer problems 2020 totals $30000 2021 25000 most was after treatment best advice figure at least 2000 per month in a reserve acc
     
    lbarnson, Feb 17, 2022
    lbarnson, Feb 17, 2022
    #6
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