Many Chevrolet,^® Buick,^® GMC^® and Cadillac^® vehicles on the road today use OnStar hardware, which leverages cellular networks for connectivity. As U.S. cellular carriers transition to 4G and 5G connectivity, certain vehicles may experience issues that prevent voice services. In 2021, OnStar began working with AT&T on network updates and started executing over-the-air software updates to ensure Members were not impacted by the network transition.

In the U.S., the 3G network sunset will impact certain 2015 model year and newer GM vehicles.

The 3G network was discontinued in February 2022.

OnStar addressed the 3G network sunset by working with AT&T to make necessary network updates. All impacted vehicles received a network update to protect them from the 3G sunset, and OnStar will continue to deploy over-the-air software updates throughout 2022 to ensure an optimal experience for Members.

A small number of 2015 model year vehicles with an inactive or disabled OnStar system will require an OnStar hardware replacement if services are desired after the 3G network sunset. You can contact your local dealership to learn about associated costs for the hardware replacement.

No. You do not have to request any future over-the-air software updates. Depending on your vehicle, you may have already received the software update automatically or a prompt asking you to accept the software update.

Members with an active, connected vehicle will receive an over-the-air software update. The update does not require a paid plan.

While all impacted vehicles received a network update, a small percentage of vehicles may experience an issue connecting to OnStar. These Members will not be able to use voice services when they push the blue OnStar button or the red Emergency button.

If you press your red Emergency button or Automatic Crash Response* is triggered, the Advisor will be able to receive your contact information and vehicle location. The OnStar Advisor will then attempt to call you back using the phone number on file. For any calls that do not have voice services and Automatic Crash Response is triggered, OnStar will automatically request emergency services be sent to your vehicle’s location.

If you are unable to get in touch with OnStar during an emergency, you should contact 911 immediately.

OnStar is actively working with AT&T to explore solutions for this issue. Updates will be communicated at a later date.

Until the voice services issue is resolved, you can use the OnStar Guardian^™ app* to contact OnStar. Within the OnStar Guardian app, you’ll have access to the blue OnStar button, the red Emergency button and Roadside Assistance* from the app’s home screen. The OnStar Guardian app also offers Mobile Crash Response, which uses smartphone sensors to detect a crash and alert an OnStar Emergency-Certified Advisor.*

You can also speak with an OnStar Advisor by calling 1.888.4ONSTAR (1.888.466.7827). 

The OnStar Guardian app is included in Safety & Security, OnStar One* and OnStar One Super Cruise.* Members can download the Guardian app from the App Store^®* or Google Play.™

You can learn more about the OnStar Guardian app here.