mobile-menu-icon
GM Authority

Reply To: Where is the Onstar box located IN the 2021 Sierra?

June 8, 2023 at 8:50 pm #764882
Parts Man1
Participant

I believe its under the dash on the drivers side..

Subscribe to GM Authority

For around-the-clock GM news coverage

We'll send you one email per day with the latest GM news. It's totally free.