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Thread: Fault Codes U2023 and P0087

  1. #1
    Join Date
    Apr 2016
    Location
    Mona Vale
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    652

    Fault Codes U2023 and P0087

    Hi Gents

    Tonight while driving home I received the above fault codes, lost significant amount of power and the lights "Gearbox error" and "Restricted Performance" illuminated on the dash.

    Ive read the codes as follows:

    U2023 - Gearbox - control module network signal calibration data
    P0087 - Engine Management - Fuel rail/system pressure - too low

    Was hoping for suggestions of things to do/check tomorrow..

    1) Replace fuel filter
    2) Check battery voltage
    3) is there a fuel pump filter? if so, where is it?
    4) anything else I can check myself?
    2011 Fuji White D4 w/ facelift front and tail lights, 2016 front bumper and grill.
    Black Pack interior trim - CB - Waeco Fridge - 3 Way Lift Rods - Rock Sliders - Pirelli ATR Plus 265/60/18. Nanocom Evo
    Northern Beaches Syd.

  2. #2
    Join Date
    Oct 2014
    Location
    Brisbane
    Posts
    3,531
    Fuel filter, LPFP and HPFP are all possible suspects, in order of cost. The LPFP is in the tank.
    Have a read of this:
    DISCO3.CO.UK - View topic - Robbie's Guide To The Low Pressure Fuel System

    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels, Traxide DBS, Rhino Platform, APT sliders & protection plates, Prospeed Winch Mount with Carbon Winch, Mitch Hitch & Drifta Drawers
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  3. #3
    Join Date
    Jan 2017
    Location
    Perth, Western Australia
    Posts
    90

    HPFP?

    Quote Originally Posted by Lukeis View Post
    Hi Gents

    Tonight while driving home I received the above fault codes, lost significant amount of power and the lights "Gearbox error" and "Restricted Performance" illuminated on the dash.

    Ive read the codes as follows:

    U2023 - Gearbox - control module network signal calibration data
    P0087 - Engine Management - Fuel rail/system pressure - too low

    Was hoping for suggestions of things to do/check tomorrow..

    1) Replace fuel filter
    2) Check battery voltage
    3) is there a fuel pump filter? if so, where is it?
    4) anything else I can check myself?
    What was the outcome I have the same errors?

  4. #4
    Join Date
    Mar 2018
    Location
    Perth
    Posts
    661
    Quote Originally Posted by orville View Post
    What was the outcome I have the same errors?
    Want to borrow my fuel pressure gauge? I cable-tied it to the windscreen wiper and drove until it faulted. That ruled out the LPFP & Filter, leaving only the HPFP as the potential culprit.

  5. #5
    Join Date
    Jan 2017
    Location
    Perth, Western Australia
    Posts
    90
    I have a gauge, I bought one to test lpfp. I guess the outcome is obvious, trying to eliminate everything before jumping into a new hpfp.

  6. #6
    Join Date
    Mar 2018
    Location
    Perth
    Posts
    661
    Quote Originally Posted by orville View Post
    I have a gauge, I bought one to test lpfp. I guess the outcome is obvious, trying to eliminate everything before jumping into a new hpfp.
    As mine was all but undriveable last week, I "tickled" the PCV on the HPFP last Saturday which put the fault into remission for about 500k's, but it came back last night. I have a few other things to try, but I know ultimately it's going to need a new pump. I'm just prolonging the inevitable while trying to get a more detailed understanding of the exact failure mechanism.

  7. #7
    Join Date
    Jan 2017
    Location
    Perth, Western Australia
    Posts
    90
    Thanks for the feedback, I will pass it on to my son. I have trawled the internet for ideas and found nothing. Even looked at Ford and Peugeot motors. Read discussions about the merits of two stroke oil (snake oil?) . I think he is going to take out the lpfp and clean the filter as a possibility.

  8. #8
    Join Date
    Mar 2018
    Location
    Perth
    Posts
    661
    Quote Originally Posted by orville View Post
    Thanks for the feedback, I will pass it on to my son. I have trawled the internet for ideas and found nothing. Even looked at Ford and Peugeot motors. Read discussions about the merits of two stroke oil (snake oil?) . I think he is going to take out the lpfp and clean the filter as a possibility.
    Which is why I suggested using the gauge. You can actually watch the low-side pressure as the fault occurs. If it doesn't move (like mine) then there would be no point dropping the tank to get the LPFP out and you'd rule out the filter and associated pipework at the same time. Of course if the low-side pressure tanks as the fault occurs then you have more reason to tear into the fuel supply system.

  9. #9
    Join Date
    Jan 2017
    Location
    Perth, Western Australia
    Posts
    90
    I will try your idea.

  10. #10
    Ean Austral Guest
    Quote Originally Posted by BradC View Post
    As mine was all but undriveable last week, I "tickled" the PCV on the HPFP last Saturday which put the fault into remission for about 500k's, but it came back last night. I have a few other things to try, but I know ultimately it's going to need a new pump. I'm just prolonging the inevitable while trying to get a more detailed understanding of the exact failure mechanism.
    Found this part interesting , how did you tickle the PCV on the pump. ??

    Cheers Ean

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