See also:

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 ...

Up-Shift Light
Vehicles with a manual transmission have an up–shift light on the instrument panel. This light shows when to shift to the next higher gear for the best fuel economy. When this light comes o ...

Cruise Control Light
This light comes on whenever the cruise control is active. The light goes out when the cruise control is turned off. See Cruise Control for more information. ...