I was wonering if anyone else has noticed the light audible click when pressing the brake pedal? The sound even resinates a little in the dash area. It's a very light click and sorry if I have now brought it to your attention. It does it sitting and driving. Almost sounds like a selinoid...
The difference is GMC is shipping them to be retro fitted later. I have a 2022 AT4 and am taking it in this week to have the heated/cooled seat and steering wheel chip or module installed.
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