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 
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Advisor can run a check.
See also:
Brake Assist
This vehicle has a brake assist feature designed to assist the driver in
stopping or decreasing vehicle speed in emergency driving conditions. This
feature uses the stability system hydraulic brake ...
Control of a Vehicle
Braking, steering, and accelerating are important factors in helping to control
a vehicle while driving. ...
Setting Cruise Control
If the cruise button is on when not in use, it could get bumped and go into cruise
when not desired. Keep the cruise control switch off when cruise is not being used.
The cruise control light on th ...