Eaton Ultrashift engine will not start in neutral when hot

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by com5984, Jun 23, 2024.

  1. com5984

    com5984 Bobtail Member

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    Jun 23, 2024
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    Hi,

    I'm having the above issue and before that it will not drive in second gear, showing a F on the gear indicator screen. If you park the coach up and isolate it for an hour or 2 it will start but once hot will do it again. Here is a video of the service light and warning sound https://youtube.com/shorts/-6Cb7MhhXFQ
    This is my first ultrashift and I'm a bit lost,there seems to be limited mechanics in my country who are experts. I'm thinking it must be some sort of sensor but how do I determine which one or do I replace the lot?
     
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  3. Goodysnap

    Goodysnap Road Train Member

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    Heavyd, com5984 and QUALITYTRUCK Thank this.
  4. Ridgeline

    Ridgeline Road Train Member

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    I assume you are not in the US?
     
    Magoo1968 Thanks this.
  5. bryan21384

    bryan21384 Road Train Member

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    Try unhooking the main battery, let it sit for a couple of minutes then restart it. Sometimes it's a sensor, sometimes automatic trucks hang themselves in gear, sometimes it's a bad harness, it could be anything. The last time I drove an Eaton, the F came up on the dash and it would hang itself in gear.
     
    com5984 Thanks this.
  6. com5984

    com5984 Bobtail Member

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    Jun 23, 2024
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    Australia
     
    Magoo1968 Thanks this.
  7. com5984

    com5984 Bobtail Member

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    Jun 23, 2024
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  8. Goodysnap

    Goodysnap Road Train Member

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    Don’t guess.

    Find somebody that can hook up and diagnose.
     
    Heavyd and com5984 Thank this.
  9. com5984

    com5984 Bobtail Member

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    Jun 23, 2024
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    I found someone, oil change and software update, seems to be working heaps better.
     
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