Q: My car shakes really bad when going over 40 mph

asked by on

My Mazda 3 shakes bad when I'm driving on the fwy. Once going over 40mph, it shakes. Example: if I'm talking out loud while driving over 40, you can hear the shake in my voice. We've checked the tires, had them balanced. And it's still shaking. There's no engine light or anything that shows signs of something's wrong, except before the car was a LITTLE bit quieter than it is now. When we press the accelerator, you hear a slight loudness of the engine vs before, it was a little quieter. Any idea what this could be??

My car has 90000 miles.
My car has an automatic transmission.

Hi there. From the description you have given, your vehicle shakes over 40 mph. The first thought would be the tires like you’ve mentioned. Typically vibration (shakes) are due to something that is out-of-balance. Given the tires and wheels have been balanced, it could be a wheel bearing vibration, as a worn, loose, or bad wheel bearing could cause shaking. It could also explain the noise getting louder as you accelerate.

This could also be an out-of-balance axle shaft, as worn cv joints (attached to each end of the axle shaft) typically creating a clack-clack-clack noise while turning. To get a precise diagnosis, you can get in touch with YourMechanic to inspect the noise in person and follow through with any repairs that are appropriate.

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. My car shakes really bad when going over 40 mph

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: Transmission died while I was driving

Ford had a technical service bulletin on these back in May of 2008 involving replacing sun gears and other components on models built before March 15, 2008. If yours falls into this category, hopefully the replacement you received incorporated the...

Q: Q: Grinding noise when steering left or right.

This is a common symptom of failing wheel bearings. A wheel bearing will usually fail due to pitting or small damage on the surface of the rollers or the bearing race. Both the surface of the rollers and the race...

Q: Car parts that get damaged while driving through water

When you drive through water, the electronic parts should really never get wet because it can damage them. But, with that said, the electronic power-steering systems are sealed pretty well from water. They have got seals all over. Unless, it's...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...