Q: Revving and humming noise while driving - 2006 Scion xA

asked by on

Several days ago while driving my car, a revving sound developed. I thought perhaps it was the engine revving, but I noticed that the RPM gauge was normal. Today, the revving/humming noise begins after I’ve been driving about 20 minutes and the sound lasts about 6-8 seconds. It will repeat this by continuing on/off for about 5-6 times and then the sound stops. The car drives well and no problems to report with the starting, accelerating, braking, etc. There are no lights on the dashboard. I took it to a mechanic and he couldn’t find the problem. In your experience, what is causing this revving and humming sound?

It sounds like your cooling fan kicking on and off. It’s even louder and more pronounced when the AC is on. The strain on the engine also will cause the RPMs to jump up a little bit during these cycles. If you would like to have this checked, a qualified professional from YourMechanic can come to your car’s location to diagnose the noise and recommend a correction.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Revving and humming noise while driving - 2006 Scion xA

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Rattling and bumping noises underneath car & getting worse

Hello. Unfortunately, if this is not a mechanical repair to the powertrain it would not be considered under the Lemon Law. Most of the time this noise comes from the exhaust. In a lot of cases, unbolting the exhaust and...

Q: I have a 2008 scion xb, the heater started to blow cool air, the vsc light came on, and the car ran hot. It can drive. What could

Hi there. Check the coolant and see if it's low. If the coolant is low, then top off the coolant and check around to locate a coolant leak. If there is no leaks, then the coolant may have blown out...

Q: Q: Car won't start

The charging system is not recharging the battery. This is why warning lights are on the dash and the vehicle loses power. It will jump start and run until the battery runs out of juice. The most common problem...

Related articles

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...
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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...