I don't want Onstar, but when I purchased my Tahoe, it came with one year for free. That year is now about up, and I have received periodic warnings on my Tahoe speakers about renewing, which I am not going to do. However, the warnings are HYPER LOUD. It’s louder than sitting in the front row at a Megadeth concert. When it occurred, I was actually concerned that it would damage the speakers, or perhaps even crack the glass in the Tahoe. I have found no way to reduce this volume. While the OnStar warning was occurring, adjusting the radio volume level did nothing.