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Old 04-23-2022, 02:19 PM   #1
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Join Date: Jan 2022
Location: Walnut Creek
Posts: 11
Anyone towing with '21 or '22 GMC & trailer with disc brakes?

I had seen this on other forums but thought maybe this did not occur in the newer GMs - but I am not sure. The Integrated Brake Controller does not always work with the Hydraulic Disc brakes and you have to get a special adapter. My dealer brought this up today - we pick up trailer in 2 weeks and the part we would need is out of stock pretty much everywhere. There was a bulletin that had come out - I do not know if there is one for the '21/'22 models. This is for the 2020:

The second page in RED text says the part that can be used, but my question is if anyone knows will I really need this? 2022 Pinnacle 32RLTS with the Disc Brake option. 2022 GMC Sierra 3500.

This is the fix:
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Old 04-23-2022, 02:40 PM   #2
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Join Date: Apr 2021
Location: New Hampshire
Posts: 791
I'm not surprised. I needed to get an adapter for my last trailer because I upgraded all of it's lights to LEDs and my 2021 GMC truck couldn't determine if the lights were working. I suspect the lower resistance confused the warning system. Maybe your disc system resistance is too different from what 'normal' trailers have. Here is what the adapter I got looks like:
2022 Eagle 321RSTS w/Overlander II Solar Package
2024 GMC Sierra Denali 3500HD L8T Gas SWD
PullRite #4452 OE Adapter & #2700 SuperGlide Hitch
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