intermittent humming noise when driving at low speed.

[QTD]

I just scheduled an appointment to bring in it next week but in the meantime i would love to hear any input from you guys. I have a 2011 M37X making a humming noise when driving its random. I thought it was the radio but it does it with the radio off.

[Ilya]

Sounds like electrical hum (from speakers) or mechanical? *Might* be wheel bearing...how many miles on the car?

Also, can you please update your profile and list your general geographic location? Thanks!

[QTD]

Im thinking more mechanical hum.....i thought it was the speakers at first but then i turned off the radio and its still makes the hum. 45,000 miles

[Ilya]

Yeah, could be your bearings. Does it get louder when you turn the wheel left or right (do it in a parking lot with the window down).

[Frog]

Any difference with the Ac on or off ?

[QTD]

Well finally got a chance to drive it again this weekend. Around 40mph i can hear the humming noise.Im thinking maybe something with the muffler. Doesnt matter ac off or on same with the radio.

[Ilya]

Did you make sure it's not the bearing?

[QTD]

I did what you suggested and its not the bearing. Pretty much makes that hum at around 40mph. To me it sounds like a muffler noise.

[Debonair]

Does it stop when you let off the throttle? If you put the car in neutral while rolling and rev the engine does it change?

[beav626]

Being an X I wonder if its the front Differential...

[QTD]

Does it stop when you let off the throttle? If you put the car in neutral while rolling and rev the engine does it change?

yes it does stop when i let off the throttle. Will try the putting the car in neutral later.

[QTD]

update.....took it in for service at noon today. Service manager calls back and tell me they need more time..they're not sure whats wrong with it ....possible rear differential.