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  1. #1
    Fireside Member
    Join Date
    Sep 2017
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    Holland Michigan
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    2020 Duramax with 29RS brake problems

    Iíve got a 2020 Duramax with the electronic trailer module and an intermittent loss of brakes on my 29 RS. The lights all work and the troubleshooting feature says you can narrow it down to the tow vehicle or fifth wheel, but I havenít been successful identifying which one. On a Michigan to Florida drive it happened three times and came back after 50 miles or so. I previously had a 2013 Duramax and no problems with the brackets then.
    Has anybodyís had problems with the 20 or 21 Duramax brake system.

  2. #2
    Site Sponsor
    Join Date
    Feb 2018
    Location
    SW Colorado
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    Talk to your GM dealer. I think they have a service bulletin on this. Also be sure you have the correct type of breaks selected in you truck programing.
    Hope this helps
    2018 Reflection 150 Series 220RK 5th wheel. Reese R20 Titan hitch, Steadyfast system, 2004 F350 6.0 Diesel King Ranch dually, Trailer reverse lights, rear spare tire holder, storage tube, sumo springs, Victron MultiPlus and Solar

  3. #3
    Site Sponsor
    Join Date
    Sep 2020
    Location
    Central Ca
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    Have not had any issues on our 2020 truck and 2021 reflection. There was this thread (https://www.mygrandrv.com/forum/show...lverado-3500HD) awhile back but seems it was on trailer when axles have disc brakes.
    2020 GMC 3500 Denali SRW SB Duramax 4x4
    2021 Reflection 31MB Goosebox 16k

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