A little road noise is normal. A car that starts to shudder every time you speed up on the highway is not. If your car is shaking when accelerating at high speeds, the cause is usually in one of three areas: the tires and wheels, the drivetrain (axles, driveshaft, and mounts), or the engine itself. The trick is paying attention to exactly when the shaking happens. That one detail can save you a lot of guesswork and money.
First, figure out when it shakes
On your next drive, on a safe and quiet road, notice these things. Does it shake only while you press the gas, or also when you lift off and coast? Is it felt in the steering wheel, the seat, or the whole car? Does it start at a certain speed and go away above it? Write the answers down. A mechanic will ask the same questions.
| When it shakes | Most likely cause |
|---|---|
| Only while accelerating, stops when you coast | Worn inner CV joint, bad motor mount, or driveshaft problem |
| At a certain speed whether accelerating or coasting | Unbalanced or damaged tires and wheels |
| Mainly in the steering wheel | Front tire balance or front suspension |
| Mainly in the seat or floor | Rear tires, driveshaft, or U-joints |
| Rough, jerky feeling with a flashing check engine light | Engine misfire |
| Gets worse the longer you drive, with a burning smell | Sticking brake caliper |
7 common causes of a car shaking when accelerating
1. Unbalanced or damaged tires
This is the first thing to check because it is the most common and the cheapest to fix. When a tire loses one of its small balance weights, it wobbles as it spins faster. A bulge in the sidewall, a separated tread, or uneven wear can do the same. Walk around the car and run your hand carefully over each tire. If you feel lumps or see bulges, replace that tire before driving fast again.
2. Bent wheel or loose lug nuts
Hitting a pothole hard can bend a wheel rim just enough to cause vibration at speed. Loose lug nuts are rarer but much more dangerous. If you recently had a tire changed or rotated and the shaking started right after, pull over and check that every lug nut is tight.
3. Worn CV axle or CV joint
Front-wheel-drive cars send power to the wheels through CV axles. When the inner joint wears out, the car often shakes when you accelerate and calms down when you let off the gas. A torn rubber boot leaking grease near the inside of the wheel is a strong clue. A clicking noise during tight turns usually points to the outer joint.
4. Broken motor or transmission mount
Mounts hold the engine and transmission in place and soak up vibration. When the rubber cracks or the mount breaks, the engine rocks under load. You may feel a clunk when you shift into drive or step hard on the gas, plus a heavy vibration while accelerating.
5. Driveshaft or U-joint problems
On rear-wheel-drive and all-wheel-drive vehicles, a long driveshaft carries power to the back. A bent shaft, worn universal joints, or a failing center support bearing can cause vibration you feel through the floor, and it often grows with speed.
6. Engine misfire
When one cylinder is not firing properly, the engine runs unevenly and the car can stumble or shake as you add power. Worn spark plugs and bad ignition coils are usual suspects. A flashing check engine light means a severe misfire. Slow down and avoid hard acceleration, because it can damage the catalytic converter. Our guide on why your check engine light is on explains what to do next.
7. Sticking brake caliper
If a caliper does not fully release, it keeps dragging on the rotor. The car may pull to one side and shake more as the brake heats up. You might also notice a hot smell after driving. See our guide on burning smell from a car after driving fast for more on this.
Simple checks you can do yourself
- Check the tire pressure on all four tires and set it to the number on the sticker inside the driver’s door.
- Look for bulges, cuts, or uneven wear on every tire.
- Make sure all lug nuts are tight, especially after recent tire work.
- Look behind the front wheels for torn CV boots or thrown grease.
- Open the hood, have a helper shift between drive and reverse with the brake held, and watch whether the engine jumps a lot.
- Scan for trouble codes if the check engine light is on.
Is it safe to keep driving?
A mild vibration from tire balance is annoying but usually not urgent. Strong shaking, a flashing check engine light, loose lug nuts, a damaged tire, or a loud clunk are different. Those can lead to losing control or causing expensive damage. Slow down, avoid the highway, and get the car inspected soon.
How much does it cost to fix?
Tire balancing is one of the cheapest repairs at any shop. Spark plugs and a single ignition coil are moderate. A CV axle or motor mount costs more, and driveshaft repairs are usually at the higher end. Prices vary by car and location, so ask for a written estimate after diagnosis.
Frequently asked questions
Why does my car shake when accelerating but not when cruising?
Shaking that appears only under load usually comes from the drivetrain. Worn inner CV joints, broken motor mounts, and driveshaft problems are the most common reasons.
Can wheel alignment cause shaking?
Bad alignment mostly causes pulling and uneven tire wear. That uneven wear can then cause vibration, so alignment and tire balance are often checked together.
Why is my steering wheel shaking at highway speed?
Vibration felt mostly in the steering wheel usually points to the front tires or front suspension. We cover this in detail in our guide on car steering wheel shaking at 60 mph.
Can low transmission fluid cause shaking?
Yes. Low or old fluid can cause shudder, slipping, or rough shifts, especially in automatic transmissions. Check the fluid level if your car has a dipstick, or ask a shop to check it.
Final thoughts
When your car shakes while accelerating at high speeds, start with the tires, because they cause this more than anything else. If the tires are fine and the shaking only happens under power, look at the CV axles, mounts, and driveshaft. Do not ignore strong or growing vibration. Catching it early is safer and usually cheaper. This guide is general information and does not replace a hands-on inspection.
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