What is that sound?

Pick the noise, when it happens, and your speed. Get a ranked list of likely causes with urgency and cost estimates in seconds.

1

Sound Type

Which noise matches what you hear?

2

When It Happens

When do you notice it most?

3

Speed Range

How fast are you going?

Likely Causes

How It Works

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Listen

Pick the sound that comes closest to what you hear. If you are not sure, choose the one that matches the rhythm or pitch best.

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Time It

Note when the noise shows up. A clunk during braking points to a different problem than one during turning.

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Check Speed

Speed helps narrow the list. A hum at highway speed is often tires or wheel bearings. A rattle at low speed is usually something loose.

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Get Results

See a ranked list of likely causes with urgency, cost range, and exact phrases to use with your mechanic.

Real-World Scenarios

Here are three common situations and what RattleFinder suggests for each.

Scenario A

Squealing when braking at low speed

Sound: Squeal · When: Braking · Speed: 0-20 mph

Urgent Worn brake pads $150-$400 (both axles)
Monitor Glazed rotors $250-$500
Later Dust on rotors $0-$50 (cleaning)

Brake squeal at low speed almost always means the pad wear indicator is touching the rotor. Get this checked within a week.

Scenario B

Clunk when turning at medium speed

Sound: Clunk · When: Turning · Speed: 20-45 mph

Urgent Failing CV joint $200-$600 per side
Monitor Worn sway bar link $100-$300
Monitor Loose steering rack mount $150-$400

A single clunk on each turn is classic CV joint wear. If you hear a grinding sound added to the clunk, do not wait.

Scenario C

Hum at highway speed, all the time

Sound: Hum · When: All the time · Speed: 45+ mph

Monitor Wheel bearing wear $250-$600 per wheel
Later Tire cupping or uneven wear $400-$900 (new tires)
Later Differential whine $300-$1,200

A steady hum that changes pitch when you gently swerve left or right points to a wheel bearing. Try the swerve test on a safe, empty road.

Tips, Mistakes & Troubleshooting

Common Mistakes

  • Ignoring new sounds. A small rattle today can become a safety issue next month. Write down when you first noticed it.
  • Guessing the wrong sound. If you are not sure between a clunk and a rattle, try both. The results overlap and you will still get useful leads.
  • Skipping the speed question. Speed matters a lot. A hum at 60 mph is rarely the same problem as a hum at 5 mph.
  • Self-diagnosing and panicking. This tool gives you a starting point, not a final answer. Use it to have a better conversation with your mechanic.

Before You Visit the Shop

  • Print or screenshot your results. Hand it to the service writer so they know what you are hearing.
  • Record the noise on your phone. Even a 10-second clip helps the technician.
  • Note the mileage and whether the noise changes in wet weather or cold starts.
  • Ask the shop to show you the worn part before replacing it. Good shops will do this willingly.

Reading Severity Levels

  • Urgent Means safety could be affected. Schedule a visit within a few days.
  • Monitor Means it needs attention but is not an emergency. Plan a visit within a few weeks.
  • Later Means it can wait for your next regular service unless it gets worse.

What This Tool Cannot Do

  • It cannot hear your car. You are the ears. The tool matches your description to common patterns.
  • It does not know your car's history. A noise after a recent repair might be related to that work.
  • It does not cover every vehicle. Exotic cars, heavy trucks, and some EVs have unique sounds not in this database.
  • Cost ranges are national averages. Your local shop may charge more or less depending on your area.

Frequently Asked Questions

What if my noise does not match any listed sound?

Pick the closest match. The results will still point you toward the right system (brakes, suspension, engine, etc.) even if the exact sound is not listed.

Can this diagnose electric vehicles?

Some results apply to EVs (tire noise, suspension, brake issues), but EV-specific sounds like inverter whine are not covered yet. Use it for general guidance only.

Why are the cost ranges so wide?

Parts and labor vary a lot by vehicle and shop. The range covers budget to dealer pricing for common models. Always get a written estimate before approving work.

My mechanic said something different. Who is right?

Your mechanic has the car in front of them. Use RattleFinder to prepare questions and understand possibilities, not to override a hands-on diagnosis.

How often is this updated?

The diagnostic database is reviewed quarterly. Last updated: January 2026. Repair cost data is refreshed twice per year.