They talk about the chirp in this forum. I also drive in L9 on local streets and the chirp goes away and back to normal drive on highways. It's the DFM doing it thing https://www.gm-trucks.com/forums/topic/250973-2021-sierra-denali-62l-engine-or-exhaust-chirp-noise/
Remote System For questions or programming help, -R&c[0]=AT2y2eUfh8SCdZZ34cHGCHTW_fY2InMnxJp7KiSO4FyTa8JtUvmE42vmRXwsaQSyXUHbGKVBSworq7lI7ZbhB8a9ov46gm3o-49zFQbH7jpHX53EJrv4k9VkFtGZtXF5D-8hkAQom44UZQgqCzvaA8FlroVa7cz9']www.homelink.com/gm or call1-800-355-3515. I also had an issue setting up...
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