All:

I'm hearing a hum from the front end of my `13 G37xS (AWD) that is most notable at highway speeds. Anybody with an idea as to what may be wrong? Here are some observations:

1. The noise fluctuates with wheel rotation speed (higher speed = louder and higher pitch and vice versa)
2. Occurs even if the car is in neutral (e.g., does not appear to be caused by either engine or transmission)
3. No obvious performance issues, although it does seem to have come on gradually over time (worsened)
4. No tire wear, shudder or other feedback
5. Odometer reads almost exactly 60k miles (I purchased it CPO in 2015 with 12K on the clock)

Thanks in advance for any insights.

Mike

 

Tires can cause hums. Both tread pattern and age influence how little or much noise tires will generate.

Could also be a wheel bearing.

 

cra ppy tires can cause tire humming noise. rotate your tires and see if the noise changes frt to back. humming noise may also be the result of wheel bearing too.

 

If you’ve reach a certain speed and the humming is consistent or if you make a turn, say to the left and the noise gets louder but disappears when turn to the right, it’s most likely to be a front hub assembly bearing. Have you tried the left and right turn test?

Also, you can jack up the front end of the car and then support it with jack stands under the engine cradle. Have someone turn one tire at a time while you place your hand firmly on top of the corresponding strut tower. If there’s a bad hub bearing, you should feel a “grinding” being transferred up through the suspension to the strut tower.

 

What did you find as a solution?