Road noise. I have a 2020 and within 2 weeks of ownership, heard the same noise. Reported it to GM on their site of complaints and to National Transportation Safety Board as a defect. Also did same for car was hesitating-reduce power while driving-(auto stop turned off). Dealership checked everything, found nothing-of course they didn’t! mine is a lease and in 9 months-begone. Don’t get me wrong, it’s a very nice performance car with bells and whistles. PS GM nor Safety Board returned message.
