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Thread: MM3 Won’t Turn On With Remote Start

  1. Top Of Page | #1
    Teflon's Avatar

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    MM3 Won’t Turn On With Remote Start

    So I have a small problem with the MM3 not turning on when I remote start the truck.

    The screen is black and when I touch it to turn it on it just does the loading cycle Like it’s thinking and then shuts off again.

    If I shut the truck off and try to start it up again it still does nothing.

    I have checked all connections to it and everything is good.

    But when I unplug it from the obd for a few minutes then plug it back in it works like a champ as it should.

    Anyone got any idea of why it is doing this?

    Thanks


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  3. Top Of Page | #2
    Aboshan's Avatar

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    Re: MM3 Won’t Turn On With Remote Start

    Do you have the OTF cable or bypass cable unplugged or loose?.

    Not sure if its required on a 2016.

    It is on my 2018. It's the small cable that plugs in near the air horn into the back of the MM3 control unit.

    2018 Ram 3500 (Aisin) Laramie 4X4 CCSB White/Silver.
    2018 Mustang GT Lightning Blue 6 spd manual.
    2021 Charger GT AWD Triple Nickel/Black



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  5. Top Of Page | #3
    Teflon's Avatar

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    Re: MM3 Won’t Turn On With Remote Start

    Yep check it and it’s all plugged in and no loose connection there also.

    2016. Laramie 2500, 68RFE, CC 4x4. DRD Medical plan. factory rear air. 2” lift/level. 35x12.5, Revmax vb with deep pan. ARP 425 head studs.

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  7. Top Of Page | #4
    BrentM's Avatar

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    Re: MM3 Won’t Turn On With Remote Start

    Quote Originally Posted by Teflon View Post
    Yep check it and it’s all plugged in and no loose connection there also.
    Is the LED light flashing red and green or is it off.

    I almost always start mine with the remote and mine is black with the LED flashing red and green pretty often.

    I have heard that the MM3 will do this if the battery voltage is low.

    Are you still running the original batteries?

    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


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

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    Re: MM3 Won’t Turn On With Remote Start

    Quote Originally Posted by BrentM View Post
    Is the LED light flashing red and green or is it off.

    I almost always start mine with the remote and mine is black with the LED flashing red and green pretty often.

    I have heard that the MM3 will do this if the battery voltage is low.

    Are you still running the original batteries?
    Well that would make sense.

    It has been sitting for a few days.

    Batteries are newer (3months old).

    The box under the dash it plugs into the led light was flashing green n red.

    So probably the problem.

    2016. Laramie 2500, 68RFE, CC 4x4. DRD Medical plan. factory rear air. 2” lift/level. 35x12.5, Revmax vb with deep pan. ARP 425 head studs.

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  11. Top Of Page | #6
    #1 VENDOR cumminsdieselfreak's Avatar

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    Re: MM3 Won’t Turn On With Remote Start

    Quote Originally Posted by Teflon View Post
    So I have a small problem with the MM3 not turning on when I remote start the truck.

    The screen is black and when I touch it to turn it on it just does the loading cycle Like it’s thinking and then shuts off again.

    If I shut the truck off and try to start it up again it still does nothing.

    I have checked all connections to it and everything is good.

    But when I unplug it from the obd for a few minutes then plug it back in it works like a champ as it should.

    Anyone got any idea of why it is doing this?

    Thanks
    Does it not work even after you get the fob in the truck and go to drive it?

    2018 Ram 2500 4x4 G56
    Romans 10:13

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  13. Top Of Page | #7
    Teflon's Avatar

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    Re: MM3 Won’t Turn On With Remote Start

    Quote Originally Posted by cumminsdieselfreak View Post
    Does it not work even after you get the fob in the truck and go to drive it?
    Nope even if I **** truck off and restart it still don’t come on.

    Just unplug and plug it back in. Work like a charm.

    Just some glitch I guess.

    Only happened 2 times in 4yrs.

    2016. Laramie 2500, 68RFE, CC 4x4. DRD Medical plan. factory rear air. 2” lift/level. 35x12.5, Revmax vb with deep pan. ARP 425 head studs.

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  15. Top Of Page | #8
    BrentM's Avatar

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    Re: MM3 Won’t Turn On With Remote Start

    My batteries just went out after 4 years, replaced them 3 weeks ago and since then the MM3 comes on every time. Looks like the MM3 will warn you of pending battery failure.

    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


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  17. Top Of Page | #9
    Murph's Avatar

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    Re: MM3 Won’t Turn On With Remote Start

    Quote Originally Posted by BrentM View Post
    My batteries just went out after 4 years, replaced them 3 weeks ago and since then the MM3 comes on every time. Looks like the MM3 will warn you of pending battery failure.
    Did not know this, great thread and thx!


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