See also:

Reducing Speed While Using Cruise Control
If the cruise control system is already activated, Press and hold the SET– button on the steering wheel until the desired lower speed is reached, then release it. To slow down in small amount ...

Adding or Changing Preset Destinations
This feature allows additions or changes one of five preset destinations. When a destination has been added as a preset destination, it is available to select from the Destination Entry screen. Se ...

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 v ...