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:
Online Owner Center
GMC Owner Center (U.S.) www.gmcownercenter.com
Information and services customized for your specific vehicle — all in one convenient place.
• Digital owner manual, warranty information, and more ...
Steering in Emergencies
• There are some situations when steering around a problem may be more effective than braking.
• Holding both sides of the steering wheel allows you to turn 180 degrees without removing a hand.
...
Manual Transfer Case
The transfer case shift lever is on the floor to the right of the driver.
Use this lever to shift into and out of Four-Wheel Drive.
A Four-Wheel Drive indicator light comes on when you shift int ...