How to cancel your OnStar subscription
You can cancel your account any time online by following the steps below, pushing your blue button or calling an advisor directly at 1.888.4ONSTAR (1.888.466.7827).
Step 1. Log in to Owner Center and select OnStar.
Step 2. Open My Plans and then select the name of the plan you wish to cancel.
Step 3. Review your selection and click “cancel my plan.”