OnStar not working

This experience with OnStar in your Sierra sounds frustrating, @Luigee559. Allow us to learn more about your situation and explore any opportunities for assistance alongside your preferred GMC dealership while they work towards a resolution for your concerns. An outcome is not something we can guarantee at just this moment, but we can connect with the dealer you prefer, request their insight, and best assist through a service visit. To start, please send us a private message with your full name and contact information, VIN, current mileage, and dealership name/location to OnStar_Support. Any other context you can share on what you've been told by dealers is also appreciated, as this can help in our investigation. To send this message, just click the envelope icon at the top right of your screen. We will watch our inbox. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement.