A car that shakes is telling you something, but the message depends on when and where you feel it. Shaking can come from tires and wheels, brakes, axles and suspension, or the engine and drivetrain. Narrowing down when it happens is the fastest way to narrow down the cause. This article is general guidance, not a diagnosis, and a mechanic should inspect anything that persists.
Is It Safe to Drive a Shaking Car?
It depends on how severe it is and what else is happening. As a cautious rule:
- Mild, steady vibration at certain speeds often relates to tires or wheel balance. It is worth getting checked soon, but it is usually not an emergency.
- Violent shaking, a flashing check engine light, loss of power, grinding or a pulling steering wheel are reasons to pull over safely and call for assistance.
When in doubt, avoid highway speeds until the car has been inspected, since a failed wheel, tire or suspension part can affect control.
Work Out When the Shaking Happens
| When it happens | Common areas to check |
|---|---|
| At idle, smoother when moving | Engine misfire, spark plugs, engine mounts, vacuum leak |
| Only at certain speeds (for example around 40 mph or 60-70 mph) | Tire balance, uneven or damaged tires, bent wheel |
| When braking | Brake rotors or calipers |
| When accelerating | Axles, drivetrain, motor mounts, engine misfire |
| While turning | Axle or CV joint wear, wheel bearings |
| Constant, at all speeds | Damaged tire, bent wheel, suspension parts |
Tires and Wheels
Tires and wheels are the most common source of shaking that appears at speed. Possible causes include out-of-balance wheels, uneven tread wear, a bulge or separated belt in a tire, a bent wheel, loose lug nuts or incorrect tire pressure. Shaking in the steering wheel often points to the front wheels, while a seat or floor vibration can point to the rear. A tire shop can balance and inspect them. See wheel balancing vs. alignment and low tire pressure symptoms.
Brakes
If the car or steering wheel shakes mainly when you press the brake pedal, warped or unevenly worn rotors or a sticking caliper are possible causes. Brake issues affect stopping ability, so have them looked at promptly. See how long brakes last for signs of worn parts.
Engine Problems
An engine that shakes at idle or hesitates under load may have a misfire from worn spark plugs, ignition coils, fuel delivery problems or a vacuum leak. Worn engine mounts let normal vibration reach the cabin. A flashing check engine light with shaking suggests an active misfire; reduce driving and get it checked. See our guides on engine vibration and the broader engine troubleshooting guide.
Axles and Drivetrain
A bent axle, worn CV joint or damaged driveshaft can cause shaking that grows with speed or acceleration. Clicking when turning is a common clue for CV joints. Automatic cars may also shudder if the transmission has trouble; see automatic transmission problems.
Can Low Oil Make a Car Shake?
Low oil does not usually cause a shake by itself, but it can lead to engine roughness, knocking or overheating, which may be felt as vibration. Check the oil level when the engine is off and the car is on level ground. If the oil light is on, stop driving and add oil or arrange a tow. See the signs you need an oil change.
What You Can Check Yourself
- Look at tires for bulges, uneven wear and low pressure
- Check that lug nuts are tight
- Check engine oil and coolant levels
- Note whether the check engine light is on, and read any codes
- Note exactly when the shaking occurs, since this helps a mechanic
When to See a Mechanic
Book an inspection if the shaking is new, getting worse or tied to braking, steering or a warning light. Describing the speed range, whether it is felt in the wheel or the seat, and any noises will speed up diagnosis.
Frequently Asked Questions
Why does my car shake over 40 mph?
Wheel imbalance, tire damage or worn suspension or steering parts are common possibilities. Shaking that appears in a specific speed range often relates to wheels and tires.
Why does my car feel like it is vibrating?
Vibration can come from tires, brakes, axles or the engine. Pay attention to when it occurs, as the pattern points toward the source.