Skip the auto shop - Our mechanics make house calls

Q: on/off humming sound over 65mph

asked by on

I noticed a "humming" noise in a kind of off-on-off-on manner, when I drive over 65 mph it's like 1 second humming, 1 second off, 1 second, 1 off .... and so on. it has Firestones tires. I did alignment, bearing checking (no problems) balance and tire rotation, still didn't help. If the car on park and step on gas to high rpm no humming, its only happens when oh highways over 65mph, humming on/off will be in faster pattern, till I can't to notice it on 80mph I guess because the high road noise on that speed.
My car has an automatic transmission.

A: A "humming noise" while driving a...

A "humming noise" while driving at speed can be caused by tires or wheel bearings. If you drive with the window open and you hear the noise outside the car, like the sound bouncing back at you from a wall, highway divider, etc, then it's most likely your tires.

Also, if you run your open palm across the tread surface of the tires and you feel a choppy pattern, like if you made a fist and ran your opposite hand across your knuckles, that's another sign that the noise may very well be from the tires.

When driving with the windows closed, if you hear the noise change volume or pitch when say, changing lanes, then it it most likely one or more wheel bearing.

If you'd like to get this fixed, consider YourMechanic, as a certified technician can help you diagnose the source of the noise and make the necessary repair. Good luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Humming noise in rear while driving

A humming noise is typically caused by loose exhaust components or possibly road debris that was run over and caught in the undercarriage of the vehicle. A test drive of the vehicle will be needed to determine where the sound...

Q: Pinion bearing making noise

The pinion bearing is a common issue with Ford rear ends. Most of the time, this failure is due to a differential leak that was not addressed and the bearing run dry. I recommend having a trained technician, such as...

Q: Clicking from wheels when turning

With the information provided about your Subaru, it would be likely that the axles would need to be replaced. While a bad wheel bearing can make a noise while turning, the noise would usually sound like a groaning noise that...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.