2012 337 def gauge

Discussion in 'Peterbilt Forum' started by Campmech, Apr 18, 2019.

  1. Campmech

    Campmech Bobtail Member

    Joined:
    Apr 18, 2019
    Messages:
    2
    Thanks Received:
    0
    0
    Hey group, I have a 2012 337 with a def gauge that reads empty all the time. Sending unit is new, gauge is ok. Wondering if tank being over full might cause this?
     
    Campmech, Apr 18, 2019
    #1
  2. Intothesunset

    Intothesunset Road Train Member

    Joined:
    Apr 15, 2019
    Messages:
    2,289
    Thanks Received:
    4,880
    Location:
    truck
    0
    Faulty connection, or short perhaps?
     
    Intothesunset, Apr 18, 2019
    #2
  3. Campmech

    Campmech Bobtail Member

    Joined:
    Apr 18, 2019
    Messages:
    2
    Thanks Received:
    0
    0
    The connections at gauge and sending unit are ok. I probably need to check the harness. Anyone have a wiring diagram?
     
    Campmech, Apr 18, 2019
    #3
  4. pushbroom

    pushbroom Road Train Member

    Joined:
    Sep 1, 2012
    Messages:
    1,779
    Thanks Received:
    7,317
    0
    Is the unit deleted by any chance?
    If it shows empty with no check engine light on, I would suspect its deleted or improper programming in the CECU.
    Proper software is needed to accurately diagnose/fix this
     
    pushbroom, Apr 18, 2019
    #4
    spsauerland Thanks this.