Why Is My Car Shaking?

Written in plain English and reviewed by the eli5cars editorial team · Last reviewed June 2026

Most likely: Worn or broken motor mounts; most likely
Safe to drive?: Check before driving
Typical fix cost: $25 DIY – $350 shop

Full breakdown below ↓

Plain-English explanation

Think of your car like a washing machine on spin cycle — if one side is heavier than the other, the whole machine shakes. Cars shake for the same basic reason: something that's supposed to be round, balanced, or cushioned isn't anymore. A tire with a bubble, an engine that's misfiring (like a runner with one leg tied), a motor mount that's turned to mush, or a wheel bearing that's lost its smooth rolling surface can all cause the whole car to shake. The timing — when exactly the shake happens — tells you where to look first.

Most likely causes — ranked

Worn or broken motor mounts

🔴 most likely

Driveway Pinpoint Test

With the engine running and in park, rev it gently to about 2,000 RPM and watch the engine from the front (pop the hood). The engine should barely move. If it rocks significantly side-to-side or you feel a heavy thud when you shift from Park to Drive, a motor mount has failed. At idle, a bad mount often causes a vibration you can feel through the gear lever.

Fix-vs-Skip Money Panel

DIY Cost

~$60

parts only

Shop Cost

~$350

parts + labor

If you skip it

A completely collapsed motor mount lets the engine rock freely. Eventually, the engine can move far enough to damage coolant hoses, the exhaust, or wiring harnesses — turning a $350 fix into a $700+ repair.

Estimates only — real prices vary by region, vehicle, and shop. Updated 2026.

Worn or fouled spark plugs causing a misfire

🟠 likely

Driveway Pinpoint Test

Go to AutoZone or O'Reilly and get a free OBD2 scan (takes 5 minutes). A misfire code (P0300–P0308) points directly to this cause. Also check: does the car shake worse under load (hills, acceleration) but smooth out at steady highway cruise? That's a classic misfire pattern.

Fix-vs-Skip Money Panel

DIY Cost

~$25

parts only

Shop Cost

~$150

parts + labor

If you skip it

A misfiring cylinder dumps raw fuel into the exhaust, which can destroy the catalytic converter — a $1,500–$2,500 repair. Fix the spark plugs first, always.

Estimates only — real prices vary by region, vehicle, and shop. Updated 2026.

Failing wheel bearing

🟡 possible

Driveway Pinpoint Test

On an empty road, gently swerve left and right at 45 mph (do this safely). If the vibration changes when you lean weight onto one side, it's likely a wheel bearing. Wheel-bearing shake also tends to be a humming or droning that gets louder with speed, rather than a rhythmic pulse.

Fix-vs-Skip Money Panel

DIY Cost

~$80

parts only

Shop Cost

~$350

parts + labor

If you skip it

A seized wheel bearing can lock a wheel at highway speed — a serious crash risk. Don't delay once you've identified a bearing as the cause.

Estimates only — real prices vary by region, vehicle, and shop. Updated 2026.

Check engine light on? Get a free code scan

If your check engine light is on, most auto-parts stores (AutoZone, O'Reilly, Advance) will read the code for FREE — no purchase required, just walk in. Bring the code back here and look it up at eli5cars.com/obd2 for the plain-English explanation.

Note: a scan only helps when there's an active fault code. For purely mechanical symptoms (noises, vibrations, leaks), a scan may show nothing — the suspects listed above are your starting point.

So what do I do now?

Three honest paths for fixing motor mount (engine mount) — pick the one that fits your time, tools, and risk tolerance.

Door 1 — DIY it

Moderate DIY

We don't have a curated parts/tools list for this repair yet. Based on its moderate difficulty rating, this is doable for someone with some DIY experience — expect to need more than basic hand tools.

Door 2 — Buy the part

Already have someone lined up to install it (or handy friend), and just need the part?

Search Motor Mount (Engine Mount) on Amazon

Heads up: some links below are affiliate links (including Amazon Associates) — if you buy through them we may earn a small commission at no extra cost to you. Details: /disclosure.

Door 3 — Go to a shop

Fair price band

$263–$438

parts + labor, typical US pricing

Ask the shop

Are the parts OEM or aftermarket?
Is the diagnostic fee waived if I approve the repair?
Can I get an itemized estimate before you start?
What warranty do you offer on the labor?

Got a quote already? Check if it's fair →

Watch the repair

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Frequently asked questions

My car shakes only at idle, not when driving. What does that mean?

Idle-only shaking almost always points to a misfire (bad spark plug or ignition coil) or a broken motor mount. Get a free OBD2 scan first — if there's a P03xx code, start with spark plugs. No code? Inspect the motor mounts.

My car shakes only between 60–70 mph but smooths out above and below. Why?

Speed-specific vibration is almost always wheel balance or a tire defect. A wheel that's slightly out of balance will resonate at a certain speed. Visit a tire shop for a free balance check — it's often free if you bought the tires there.

Can a bad alignment cause shaking?

Alignment usually causes pulling to one side, not shaking. Shaking at speed is almost always tires/wheels; shaking at idle is engine-related. See an alignment shop only after ruling out tire balance and engine issues.

Is it safe to drive a shaking car?

It depends on the cause. A slight tire imbalance is okay for a few days; a broken motor mount or failing wheel bearing is not. If the shake is severe, comes with a noise, or appeared suddenly, get it checked immediately.

What's the cheapest fix for a shaking car?

Tire balance (often free or $10–$20 per tire) is the cheapest thing to rule out. Spark plugs are next at $20–$80 DIY. Motor mounts and wheel bearings are in the $60–$350 DIY range depending on the car.