I have a 2021 Chevy Malibu, and recently, it started beeping every time I was idle and in the park.
Additionally, my tire pressure indicator shows low air, but I have checked it twice today, and it’s at the recommended psi. There is no air leak in the tire.
The beeping sound is used to inform you of tyre pressure. I would take it to the dealership and check if a tpms relearn resolved the issue. It could be a malfunctioning tyre pressure sensor, or it was not properly learnt.