Horn
Pressa 
on the steering wheel pad
to sound the horn.
See also:
Roadside Assistance Program
U.S.: 1-888-881-3302
TTY Users (U.S.): 1-888-889-2438
Canada: 1-800-268-6800
Mexico: 01-800-466-0801
As the owner of a new GMC, you are automatically enrolled in the Roadside Assistance program.
...
Engine Hours
To display the ENGINE HOURS, place the ignition in LOCK/OFF or ACC/ACCESSORY, then press and hold the trip odometer reset stem for four seconds while viewing the ODOMETER. This display shows the total ...
Capacities and Specifications
The following approximate capacities are given in metric and English
conversions. See Recommended Fluids and Lubricants on page 11‑12 for more information.
Engine Specifications
...