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Thread: SERVICE 4WD At Startup - MM3 Fails At Startup

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    SERVICE 4WD At Startup - MM3 Fails At Startup

    2 issues.

    Issue #1----When I start up my 2017 ram 2500 6.7L tradesman G56. I get the "service 4WD" message and then it goes away.

    Sometimes over bumps I get the "4wd shift in progress" message when I'm not manually shifting it.

    Edit: any reason for the service 4wd message? truck recently hit 30k miles?

    Is a sensor going out? Could it be the actuator?

    Issue #2--- whenever i start my truck sometimes the MM3 Tuner will blink green and then red and i have to pull the plug from under the dash and then plug it back in for it to work.

    Any reasons why it does it 95% of startups?

    Last edited by Dtrust68; 09-28-2020 at 12:33 PM. Reason: added more info

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    Re: SERVICE 4WD At Startup - MM3 Fails At Startup

    Quote Originally Posted by Dtrust68 View Post
    2 issues.

    Issue #1----When I start up my 2017 ram 2500 6.7L tradesman G56. I get the "service 4WD" message and then it goes away.

    Sometimes over bumps I get the "4wd shift in progress" message when I'm not manually shifting it.

    Edit: any reason for the service 4wd message? truck recently hit 30k miles?

    Is a sensor going out? Could it be the actuator?

    Issue #2--- whenever i start my truck sometimes the MM3 Tuner will blink green and then red and i have to pull the plug from under the dash and then plug it back in for it to work.

    Any reasons why it does it 95% of startups?
    Try load testing your batteries individually.

    My MM3 does that more frequently in cooler weather or after it sits more than a day.

    Just haven’t had a chance to replace both yet but weak batteries will cause that.


    2016 Ram 3500 CC 4x4, G56, Dr. DRD medically cured!

    2016 RAM 3500 4x4 Laramie Crew Cab
    Cummins,G56, Rough Country level, Morimoto LED fog lights, LED headlights, Lund Attitude Steps sprayed with Line-X, DRL's Activated, 35x12.50R18 Falken Wildpeak ATW3, Fuel Vapor Wheels Matte Black w/Dark Tint, A.R.E. Truck cap and swing boxes

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