Recommended Fuel
Use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving.
If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.
See also:
Object Detection System Messages
PARK ASST BLOCKED SEE OWNERS MANUAL
This message displays if there is something interfering with the park assist system. See Ultrasonic Parking Assist on page 9‑66 for more information.
PARK A ...
Brake System Warning Light
The vehicle brake system consists of two hydraulic circuits. If one circuit is
not working, the remaining circuit can still work to stop the vehicle. For normal
braking performance, both circuits ...
Fuel
For diesel engine vehicles, see “Fuel for Diesel Engines” in the Duramax Diesel Supplement.
For Vehicles with gasoline engines, please read this. ...