2017 XC90 T8, 53,000 miles. 

Just got back from a 3,000 mile road trip so I took the car into dealer for oil change and brake fluid flush which were due, and dealer said rear brake pads+rotors needed to be replaced as well as tire rotation so I did those as well. 


On the way home from the dealership, I noticed there is a vibration in the steering wheel at highway speed like +/- 75mph ish, so I slowed down to right lane and noticed the same thing going 50 / 60 mph ish; the steering wheel was vibrating / shaking — not deathly just a little bit but not like it normally is. 

THEN later turning in my street at lower speed and from a standstill, there is a very noticeable hum. Both turning left and right but right is more pronounced. almost like rhythmic. 

Neither myself nor my father noticed this during the road trip (before service) but we both do now. 

I attached part of a video where you can hear it, but turn phone volume all the way up. And ignore the louder leather sound, that’s the steering wheel in my hand. again it’s like a muted hum. 

Does anyone know what this could be? Is it the dealership did something wrong / improperly? Do the tires just need to be balanced (they were only rotated and not balanced)? 

Thank you!  

vibration and humming issue.