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 ...

Flash-to-Pass
This feature lets you use the high-beam headlamps to signal the driver in front of you that you want to pass. It works even if your headlamps are off. Pull the turn signal lever toward you briefl ...

Reduced Engine Power Light
This light comes on when a noticeable reduction in the vehicle’s performance occurs. The vehicle can be driven at a reduced speed when the reduced engine power light is on, but accelerati ...