Onstar.com
The website provides access to account information, manages the OnStar subscription, and allows viewing of videos of each service.
Get subscription plan pricing and sign up for OnStar Vehicle Diagnostics. Click on the “My Account” tab on the home page.
See also:
Tow/Haul Mode
4-Speed Automatic Transmission
6-Speed Automatic Transmission
Vehicles with an automatic transmission have a Tow/Haul Mode. The Tow/Haul Mode adjusts the transmission shift pattern to reduce shi ...
Sunroof
The ignition must be in ON/RUN or ACC/ACCESSORY to operate the sunroof and power sunshade.
See Retained Accessory Power (RAP) on page 9‑20.
The vehicle may have a sunroof over the front seats ...
Rear Seats (Extended Cab Full Bench)
Folding the Rear Seat
Notice: Folding a rear seat with the safety belts still fastened may cause damage to the seat or the safety belts. Always unbuckle the safety belts and return them to their norm ...