How do I set up my OnStar account?
If you’re an OnStar Member, you can set up an account in your vehicle Owner Center or tie your OnStar service plan to your existing account. Visit the Owner Center and follow the instructions there.
How do I find my OnStar account number?
You can push your blue OnStar button, call 1.888.4ONSTAR, or refer to your Member card or OnStar monthly diagnostics report for your OnStar account number.