How do I set up my OnStar account?
If you’re an OnStar Member, you can set up an account in your vehicle Owner Centre or tie your OnStar service plan to your existing account. Visit the Owner Centre and follow the instructions there.
How do I find my OnStar account number?
You can push your blue OnStar button, call 1.888.4ONSTAR (1.888.466.7827), visit your account on the Owner Centre or refer to your OnStar monthly diagnostics report for your OnStar account number.