Driving on Grades
Reduce speed and shift to a lower gear before starting down a long or steep downgrade. If the transmission is not shifted down, the brakes might have to be used so much that they would get hot and no longer work well.
The vehicle can tow in D (Drive).
Use a lower gear if the transmission shifts too often.
When towing at high altitude on steep uphill grades, engine coolant boils at a lower temperature than at normal altitudes. If the engine is turned off immediately after towing at high altitude on steep uphill grades, the vehicle could show signs similar to engine overheating.
To avoid this, let the engine run while parked, preferably on level ground, with the transmission in P (Park) for a few minutes before turning the engine off. If the overheat warning comes on, see Engine Overheating.
See also:
Buying New Tires
GM has developed and matched specific tires for the vehicle. The original equipment
tires installed were designed to meet General Motors Tire Performance Criteria Specification
(TPC Spec) system r ...
Dual Mode
This dual screen symbol displays when the screen is in dual mode.
Dual mode displays the route on half of the screen and a maneuver or Interstate
Exit list on the other half. The Interstate Exit ...
Using Voice Commands During a Planned Route
Cancel Route
1. Push . System responds: “OnStar
ready,” then a tone. Say “Cancel route.” System responds: “Would you like to cancel
route directions to your destination?”
2. Say “Yes.” System re ...






