2020 Duramax with 29RS brake problems

[Garyvv]

I’ve 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 haven’t 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 anybody’s had problems with the 20 or 21 Duramax brake system.

[powerscol]

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

[Wynn1427]

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.