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error code 559 in ISX, fuel pressure dropping

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by krsnead01, Jan 18, 2019.

  1. Jan 18, 2019 #1
    krsnead01

    krsnead01 Bobtail Member

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    Jan 18, 2019
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    We're having problems with a remanned low milege ISX 15 motor. Anyone run into this and know where the fuel pressure drop is coming from?
    Also, Cummings isn't recognizing the serial number on the QSOL, anyone had that problem?

    Thanks
     
    krsnead01, Jan 18, 2019
    krsnead01, Jan 18, 2019
    #1
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  3. Jan 18, 2019 #2
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    559 is a very generic fuel system fault code for fuel rail pressure failing to meet commanded and troubleshooting will be required. Could be anything from a plugged fuel filter to a failed fuel injector or relief valve stuck or leaking. Use your original ESN from the chassis as the troubleshooting steps will be identical.

    Good luck
     
    Goodysnap, Jan 18, 2019
    Goodysnap, Jan 18, 2019
    #2
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