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HenryZ

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  1. I am not sure if my problem is with this issue. I set the SOUNDS to what I like (12 Bass and 6 Treble) . After shutting off my 2021 Sierra SLE and then restart it, all of the SOUNDS return to a neutral position. I did contact the dealer but he stated he did not know how to fix it and there were no bulletins. I then contacted GMC in Detroit and they said they are checking into this. Has anyone else had this problem?
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