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Thread: MM3 Tuner - Blank Screen With Flashing LED

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    Moparstew6.7's Avatar

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    MM3 Tuner - Blank Screen With Flashing LED

    When I left work, my MM3 was on the loading screen for way longer than normal.

    Once it finally loaded, it stuck loading the gauge readings I have selected on my dashboard.

    So I unplugged it, and yes, knowing these connections are sensitive, I carefully unplugged it and plugged it back in; after that, I only get a blank screen and led flashing: red, red, green, red, red is my issue now in the cable or am i missing something?

    Also, cycling the ignition didn’t change anything.

    I really appreciate any help you can provide.


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    I WILL STAND! AK Bob's Avatar

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    MM3 Tuner - Blank Screen With Flashing LED

    Unplug from the OBD port and plug back in.


    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.

    Sent from my iPad using Tapatalk

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  5. Top Of Page | #3
    Moparstew6.7's Avatar

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    MM3 Tuner - Blank Screen With Flashing LED

    Quote Originally Posted by AK Bob View Post
    Unplug from the OBD port and plug back in.


    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.

    Sent from my iPad using Tapatalk


    Of course, the one other simple thing I didn’t think of.

    It’s good now.

    Thanks


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    I WILL STAND! AK Bob's Avatar

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    MM3 Tuner - Blank Screen With Flashing LED

    Quote Originally Posted by Moparstew6.7 View Post


    Of course, the one other simple thing I didn’t think of.

    It’s good now.

    Thanks
    No problem, pulling the OBD plug will allow the system to reboot as it removes power from the monitor and the box under the dash.


    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.

    Sent from my iPad using Tapatalk

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  9. Top Of Page | #5
    BrentM's Avatar

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    MM3 Tuner - Blank Screen With Flashing LED

    Mine started doing this, and someone on this great forum told me they had a similar experience, and the batteries were the culprit.

    Sure enough, about 2 months later, my batteries went.

    If you are running the factory batteries, you may want to plan for replacements.

    It could also be an SD Card issue or USB cable, few things to check.

    Brent
    2017 Ram 2500 Limited / 6.7 / 68RFE / BDS 8" Lift / 38 x 13.5 Trail Grapplers / 20 x 10 Hostile Wheels
    2020 Ram 2500 Tradesman / 6.7 / 68RFE
    1993 W250 LE / 5.9 12V / G360 - 5 Speed


  10. Top Of Page | #6
    6.7 Coal Train's Avatar

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    MM3 Tuner - Blank Screen With Flashing LED

    I have to unplug my OBDII for a reset every 3-6 months, it seems.

    I wouldn't call the MM3 "high-tech," but it does its job.

    2017 2500 Laramie: DRD Juiced, 5" TBE, Invisible EGR mod, BD Iron Horn 364sxe/1.0AR, 20x10 Hostile Sprockets, 33x12.50 General Grabber A/T, HID Conversion, Reverse Level 2" Drop CSS Rear Coils

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