We’re always here for you.

We’re always here for you.

Call us. Write us. Chat us up. Here’s how.

OnStar Phone Number

Contact OnStar by Mail

OnStar Member Services
P.O. Box 1027
Warren, MI 48090-1027

TTY for hearing/speech impaired 


Dept #77246 
OnStar Service Plan Center 
P.O. Box 77000 
Detroit, MI 48277-0246 

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Start a live chat.

Need an answer quick? Our Advisors are anywhere you are — including online. Your OnStar Customer Service team is ready to help you with anything you need, whether it’s OnStar services, account questions, safety concerns or anything in between. 

Ask the OnStar Community.

Go ahead. Find your people. Get tips, tricks and troubleshooting advice from other Members and Advisors on all things OnStar.

Get support. 

Check out our support pages for frequently asked questions on a variety of topics.  

We’ve all got stories. What’s yours?

Has OnStar saved the day for you? Have you found a service or feature that surprised you? An Advisor who went above and beyond? We love stories. And we’d love to hear about your experience.