OnStar Services
See also:
Filling the Tank
If the vehicle has a diesel engine, see the Duramax diesel supplement for more information.
WARNING
Fuel vapor burns violently and a fuel fire can cause bad injuries.
To help avoid injuries to you ...
Brake System Messages
BRAKE FLUID LOW
This message is displayed when the brake fluid level is low; see Brake Fluid
on page 10‑24.
RELEASE PARKING BRAKE
This message is displayed as a reminder that the parking br ...
Average Economy
Press the trip/fuel button until AVG ECONOMY displays. This display shows the approximate average liters per 100 kilometers (L/100 km) or miles per gallon (mpg). This number is calculated based on the ...





