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:
Driving on Snow or Ice
Drive carefully when there is snow or ice between the tires and the road,
creating less traction or grip. Wet ice can occur at about 0°C (32°F) when
freezing rain begins to fall, resulting in even l ...
Reading Lamps
For vehicles with front reading lamps in the overhead console, press the button
located next to the lamp to turn it on or off.
The vehicle may also have reading lamps in other locations. The lamps ...
California Fuel
Requirements
If the vehicle is certified to meet
California Emissions Standards, it is
designed to operate on fuels that
meet California specifications.
See the underhood emission control
label. If this f ...