Skip the auto shop - Our mechanics make house calls

Q: Humming noise

asked by on

No warning lights have come on and car runs fine. It recently started making a 'revving' or humming noise when I start the ignition. Noise goes away by 20-30 mph and is intermittent.

Today radio stopped working and car asked me to enter security code.

Not sure if these 2 problems are related and may indicate a more serious problem.

My car has 181000 miles.
My car has an automatic transmission.

A: It is possible that you could be having an ...

It is possible that you could be having an issue with your alternator bearing. The alternator is responsible for charging the battery and is ran by the serpentine belt.

The pulley that is connected to the alternator has a bearing that can dry out and make a humming sound. The best way to resolve this issue would be to replace the alternator.

I would recommend having a certified technician, like one from YourMechanic, diagnose the noise firsthand to determine if it is truly the cause of this issue. They'll be able to replace your alternator as necessary if it's proven to be faulty and address the issue with your radio as well.

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

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: Loud engine noise

If you are hearing a rattling noise on start up and for a couple of minutes that then goes away, then the variable valve timing actuators are at fault. The manufacturer is working on a replacement now, and will issue...

Q: Trunk door won't stay open

The trunk, also known as the rear hatch on your Honda Odyssey, is a pretty heavy piece that requires two parts known as struts to hold open. What you are experiencing is likely one or both of the rear hatch...

Q: Steering problems with car.

Honda has extended the warranty on the power steering pump on these vehicles to 7 year or 100,000 miles. The power steering pumps do not provide enough pressure to the steering system during low speeds. Your vehicle is over the...

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 Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.