Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System. If a diagnostics check is needed between e-mails, push 
, and an Advisor can run a check.
See also:
Roadside Assistance Program
U.S.: 1-888-881-3302
TTY Users (U.S.): 1-888-889-2438
Canada: 1-800-268-6800
Mexico: 01-800-466-0801
As the owner of a new GMC, you are automatically enrolled in the Roadside Assistance program.
...
Features
For most shoppers, the key feature will be the standard third-row seat. It
has adequate room for children, but adults will not find it accommodating for
more than a short trip. An optional second- ...
Trailer Wiring Harness
The vehicle is equipped with one of the following wiring harnesses for towing a trailer or hauling a slide-in camper. ...