My '15 DC V6 6-spd does the same thing...in auto 4WD only, it has alot more harmonic vibration in the gas pedal/wheel.
No sign of it in 2WD. This is on dry payment, warm temps, no traction issues, only light/part throttle. It seems to do it from a lower speed, approx.
10-15 mph, then slowly fades as speed increases. Not sure if it does it in regular 4WD, will check.