We understand the inconvenience that comes with mirror concerns like yours, @TexasKeith. For assistance with an official diagnosis and finding compatible parts for any of your Sierra's recommended repairs, we encourage you to visit your local GMC dealer. We are happy to provide an extra layer of support between you can your dealership as well. If you have any additional questions or concerns, please visit: https://s.gmc.com/support-request and fill out the support request form. We will keep our eyes peeled for your outreach.
My 2021 Silverado 1500 RST with the 5.3L (L84) engine came with DFM, but thank God for the "Range" AFM/DFM disabler module, which plugs right into the OBD-II maintenance port.
The best $300.00 I ever spent.
You aren't missing much.
I have it in my 2025 Equinox EV which has the AutoSense and it drives you nuts. Any time you walk by the back of the truck, if you are in the path long enough to hit the 4th beep it opens. It opens way too easily and unwantedly.
If you "gotta" have it, GM will be of zero help to add it, so don't even bother going that route.
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