Forum Discussion
Telematics Module Failure
I just purchased a 2025 Sierra EV Denali and have same Onstar problem. Button has solid green light indicating cell connection but nothing works. Can connect my phone to onboard hotspot but no internet, no navigation, no super cruise etc... Very disappointing and should have been caught by dealer before selling the truck. Basic stuff.
First, we want to congratulate you on your new Sierra EV, @mmcfadin. We understand your frustration with your OnStar concerns and share the same desire for you to enjoy all the features available in your new truck. If you have not yet, we highly encourage you to visit your local GMC dealer for a formal diagnosis of your concerns. That said, we would be more than happy to provide an extra layer of support between you and your dealer as we pursue their resolutions. When you have a moment, we would like to learn more so we may explore next best steps. To connect with us further, you may select the envelope icon at the top right of your screen. Then, send a private message to OnStar_Support with your full name, VIN, current mileage, and the name of your preferred GMC dealer. 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: https://www.gm.com/privacy-statement.