Could be many things but a front wheel bearing/hub assembly going bad comes to mind. Scalloped worn tires can give you a humming noise also.
The 2012 Chevrolet Tahoe has a V8 engine.
The 2012 Chevrolet Tahoe has 16 valves.
The 2012 Chevrolet Tahoe has overhead valves (OHV).
The 2012 Chevrolet Tahoe-Hybrid has a V8 engine.
The 2012 Chevrolet Tahoe is 16 ft. 10 in. (202 in.) long.
The 2012 Chevrolet Tahoe-Hybrid has 16 valves.
The 2012 Chevrolet Tahoe has a drag coefficient of 0.36 Cd.
The 2012 Chevrolet Tahoe's turning circle is 39.0 ft..
The maximum payload of the 2012 Chevrolet Tahoe is 1652 lbs..
The 2012 Chevrolet Tahoe has a 21.9 degrees angle of departure.
The height of the 2012 Chevrolet Tahoe is 6 ft. 4.9 in. (76.9 in.).
The curb weight of the 2012 Chevrolet Tahoe is 5448 lbs..