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Discussion Starter #1
Two weeks ago I noticed a buzzing sound coming from the rear of my car and I have been trying to diagnose it. It only changes with speed. Starts at around 25 mph and gets a little louder and lightly higher pitch at higher speeds, but not a lout roar. Other than changing speed, there is no change in the sound when accelerating, braking, turning, or shifting into neutral. I put it up on a lift and noticed the rear wheels (both) have a little more resistance when I turn them. I give it a shove and it rotates about half what the fronts do. They also give a bit more noise too. This occurs with the brake pads and caliper removed as well. I also turned on the vehicle and put it in drive and noticed that while with no gas three of the wheel would move at about 30 rpms, the rear drivers side when would barely move. I used a stethoscope to listen and I could hear nothing from the rear differential when manually moving the wheels nor with the engine on and gas pushed in. I could hear noise when I put the stethoscope against the metal shield behind the rotors. I am not sure it is the same noise causing the buzz i hear.

Any thoughts on what this could be and any further tests I could do. The car has 78,000 miles on it and is a 2013.
 

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You seem to have really tried to pinpoint the problem. To confirm that the left rear side is a potentially-faulty corner, I would go for a test drive and do some hard cornering both left and right turns. I'm guessing a wheel bearing or halfshaft may be bad but that is a little bit of a mystery.
 

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Discussion Starter #3
Turns dont seem to change the noise. When I was using the stethoscope I heard about the same amount of noise coming from both wheels. I had a cv axle go bad in the front right after the warranty ran out. That was more of a clicking a low speeds while turning. The CV boot was still intact, even had a dealer tell me there was no way the axle was bad. When I replaced it the clicking went away. The only thing I can think to do at this point is try to disconnect the wheel hub assembly and see if it still is still giving resistance and/or noise. My concern is there doesn't seem to be a smoking gun, and what might happen is I spend a bunch of money on a part and replace it and that doesn't fix the issue.
 
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