OnStar Services

See also:

Headlamp Washer
For vehicles with headlamp washers, they are located to the side of the headlamps. The headlamps must be on in order to use the headlamp washers. If the headlamps are not on, only the windshiel ...

When to Check and Change Automatic Transmission Fluid
It is usually not necessary to check the transmission fluid level. The only reason for fluid loss is a transmission leak or overheating the transmission. If a small leak is suspected, then use the ...

Tire Pressure
If the vehicle is a hybrid, see the hybrid supplement for more information. Tires need the correct amount of air pressure to operate effectively. Notice: Neither tire underinflation nor overinflatio ...