Why Is My Car Shaking? Common Causes, Based on When It Happens

 A car that shakes is hard to ignore, and it's one of the things drivers search for most. The tricky part is that "shaking" can come from the tires, the brakes, the suspension or the engine. A better question than "why is my car shaking?" is "when is my car shaking?" The answer points you in the right direction.

It shakes at higher speeds

If the steering wheel or the seat vibrates mainly at higher speeds, the most common cause is the wheels. A tire that's out of balance, a bent rim, a tire with a bulge, or uneven wear can all do it. A tire shop can balance the wheels and check them. Also check the tire pressure, and look at each tire for bulges or cuts.

It shakes when you brake

A shaking steering wheel or a pulsing pedal when braking often points to uneven brake discs, worn pads, or a sticking brake caliper. Don't leave this one. Brakes are a safety system, so have them inspected. If you also notice a burning smell after driving, that can be a sign of a caliper that's sticking.

It shakes at idle or when accelerating

A rough, shaking engine can be a misfire. Common causes are worn spark plugs, a weak ignition coil, a fuel or air problem, or worn engine mounts that no longer hold the engine firmly. If the check engine light comes on, especially if it's flashing, slow down and get it checked quickly, because a misfire can damage other parts.

It shakes over bumps or pulls to one side

Worn suspension or steering parts, such as joints, bushings or shock absorbers, can cause shaking, clunks and a car that doesn't feel steady. A bad wheel alignment can make the car pull to one side and wear the tires unevenly.

What to do next

1. Note exactly when it happens: speed, braking, idling, turning.
2. Check the tire pressure and look at the tires.
3. Check for warning lights on the dashboard.
4. Get a proper diagnosis from a garage. Describe what you noticed.

Stop driving and get help if the shaking comes with overheating, a flashing check engine light, a very strong burning smell, or a steering wheel that feels loose. Shaking is the car telling you something. It's better to listen early.

General information only. Check your owner's manual, and ask a qualified mechanic if you're not sure.