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: Wheel keeps humming, I think it's a wheel bearing

Hi, thanks for writing in. I believe you're on the right track. Wheel bearing failures are common on many GM vehicles particularly their trucks and SUVs. I would recommend having your wheel bearings inspected with a mechanic's stethoscope to determine...

Q: High pitched whining noise on startup

The secondary air injection pump is well known for making noises such as this on all cars that use them. It only runs when the motor is below a preset temperature. So the longer you let the car sit, the...

Q: AC clutch bearing clunking

Looking at the parts resources available to me I found no serviceable parts listed for your AC compressor. This would mean that if the compressor clutch is failing the compressor would need to be replaced. One other thing, however, would...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.