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Help! FCAN Databus Failure

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Driver Glen, Mar 2, 2019.

Page 1 of 3
  1. Mar 2, 2019 #1
    Driver Glen

    Driver Glen Bobtail Member

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    Mar 2, 2019
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    I have a 2018 peterbilt 579 with a paccar motor. When I turn the ignition on, all my exterior lights come on including my hazards. The display on the dash reads "FCAN Databus Failure (Exterior Lighting) Pull over Safely and Seek Service"

    My high beams, signals, headlight interrupt and clearance interrupt won't work at all. I have 1000 miles to drive before Monday and no peterbilt dealers are open, what can I do?
     

    Attached Files:

    Last edited: Mar 2, 2019
    Driver Glen, Mar 2, 2019
    Driver Glen, Mar 2, 2019
    #1
    DavidK57918 Thanks this.
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  3. Mar 2, 2019 #2
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    romulus,mi
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    check all fuses in underhood fuse box. pay close attention to the ones labeled "node"
     
    QUALITYTRUCK, Mar 2, 2019
    QUALITYTRUCK, Mar 2, 2019
    #2
    DavidK57918, mhyn and Driver Glen Thank this.
  4. Mar 2, 2019 #3
    Driver Glen

    Driver Glen Bobtail Member

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    All the fuses seem to be good
     
    Driver Glen, Mar 2, 2019
    Driver Glen, Mar 2, 2019
    #3
  5. Mar 2, 2019 #4
    pushbroom

    pushbroom Road Train Member

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    Fuses are labeled G1-G6 on a conventional
     
    pushbroom, Mar 2, 2019
    pushbroom, Mar 2, 2019
    #4
    SAR and Driver Glen Thank this.
  7. Mar 2, 2019 #5
    Driver Glen

    Driver Glen Bobtail Member

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    I only have a G1 and it's a bus type, I'm not sure how to check those
     
    Driver Glen, Mar 2, 2019
    Driver Glen, Mar 2, 2019
    #5
  8. Mar 2, 2019 #6
    KB3MMX

    KB3MMX Road Train Member

    3,075
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    Orrstown, PA
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    Wow that sucks!
    WTH happened to Peterbilt quality anymore?

    I'd be making some calls to the receiver and customer ASAP.
     
    KB3MMX, Mar 2, 2019
    KB3MMX, Mar 2, 2019
    #6
  9. Mar 2, 2019 #7
    Driver Glen

    Driver Glen Bobtail Member

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    I know, I'm ready to just go buy a pre emissions truck and get rid of all the bs
     
    Driver Glen, Mar 2, 2019
    Driver Glen, Mar 2, 2019
    #7
    KB3MMX Thanks this.
  10. Mar 3, 2019 #8
    fxwg1980

    fxwg1980 Bobtail Member

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    Mar 2, 2019
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    it's probably a bad wire or a data link connection problem. basically it is your chassis node not sending the signal to your cecu or vice versa. I have found bad wires right by the node or behind the front cab mount. you need a wiring diagram, ohm meter and a lot of time.
     
    fxwg1980, Mar 3, 2019
    fxwg1980, Mar 3, 2019
    #8
    DavidK57918 and KB3MMX Thank this.
  11. Mar 3, 2019 #9
    Goodysnap

    Goodysnap Road Train Member

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    Check the wiring at the support bracket under the LF cab mount just behind the driver steer tire. Commonplace for wiring to rub through and cause issues. I have also found some rubbing on the back of the chassis node below your feet under the cab.

    As already suggested, check all the"G" fuses in the underhood fuse box and dont forget to close the door when your through looking.
     
    Goodysnap, Mar 3, 2019
    Goodysnap, Mar 3, 2019
    #9
    DavidK57918 and KB3MMX Thank this.
  12. Mar 3, 2019 #10
    Ridgeline

    Ridgeline Road Train Member

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    Michigan
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    is the truck still under warranty?
     
    Ridgeline, Mar 3, 2019
    Ridgeline, Mar 3, 2019
    #10
    KB3MMX Thanks this.
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