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Thread: Hard Downshift - 2018 RAM Cummins

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    Basic Member TFDBC415's Avatar

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    Hard Downshift - 2018 RAM Cummins

    Good evening.

    New guy here.

    2018 RAM 2500.

    I always use the exhaust brake but when the truck got about 7500 miles it started a really hard downshift at 30mph when slowing down.

    Anyone else have this?

    Only does it when the EB is on.


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    MOD watersupply189's Avatar

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    Hard Downshift - 2018 RAM Cummins

    Welcome friend.

    Is your truck tuned?

    If not then I would take it back under warranty.

    It might need a computer update or something.

    Hopefully that’s all it needs.


    2016 Ram Laramie 3500, G56, 6.7, MM3 by Double R Diesel, Rough Country Leveling, 35x12.50 Nitto G2, HID headlights, Morimoto LED fogs plus a whole lot more!

    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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    Daily Grinding! RamIt's Avatar

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    Hard Downshift - 2018 RAM Cummins

    Quote Originally Posted by watersupply189 View Post
    Welcome friend.

    Is your truck tuned?

    If not then I would take it back under warranty.

    It might need a computer update or something.

    Hopefully that’s all it needs.


    2016 Ram Laramie 3500, G56, 6.7, MM3 by Double R Diesel, Rough Country Leveling, 35x12.50 Nitto G2, HID headlights, Morimoto LED fogs plus a whole lot more!
    This is actually a completely normal function of the truck.

    While utilizing the EB the truck will downshift harder than without the EB for a variety of factors.

    There is nothing wrong with your truck. Tuned or not isn't an issue.

    I have a 2019 with 2K on the ticker, does the exact same thing and my tuned 2015 did the exact same thing.

    You're good.


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    Ifishmo's Avatar

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    Hard Downshift - 2018 RAM Cummins

    I have a 2018 RAM and when the engine brake is on it skips second gear when downshifting.

    The first happened around 12k miles.

    Dealer flashed it and updated the program. Was fine for about a year and 25k miles.

    Took it back and another computer update.

    3 months and 26k miles did it again.

    Back to the dealer and they can’t figure it out. Reflagged again with the same update and okay for now.

    They reported to Chrysler, but don’t know how they will fix it.


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    Rmacauley's Avatar

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    Hard Downshift - 2018 RAM Cummins

    Quote Originally Posted by TFDBC415 View Post
    Good evening. New guy here. 2018 ram 2500. I always use the exhaust brake but when the truck got about 7500 miles it started a really hard downshift at 30mph when slowing down. Anyone else have this? Only does it when the EB is on.
    Actually I had the same thing happen on my 2016 and it turned out it was the solenoid valve body had a bunch of crap in it.

    They ended up replacing it under warranty.

    It kinda bumps into gear as it downshifts as you come to a stop right?


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