Why Is My Subaru Making That Noise? Common Sounds & Fixes
June 30 2025 - Subaru of Dayton Staff

Strange sounds are one of the first ways your Subaru tells you something’s off — but they’re also one of the easiest to ignore. You hear a rattle, a squeak, or a deep hum and hope it’s nothing. Sometimes it is. But more often, noises signal wear, imbalance, or a failing part that, left unchecked, can become a serious (and expensive) issue.

Whether you drive a Crosstrek, Outback, Legacy, or WRX, Subaru’s engineering is built for quiet strength. So if you hear something unusual, trust your instincts. Here’s a detailed guide to the most common noises Subaru owners hear, what they typically mean, and when to head to the shop.

  1. Squealing When You Start the Engine

What it sounds like: A high-pitched shriek that lasts a few seconds after you start the car.
When it happens: Cold starts, especially in winter.
Likely cause: A worn or loose serpentine belt.

This belt drives your alternator, water pump, and A/C. In cold weather, worn belts shrink or slip more easily, creating the classic morning squeal.

Fix: Belt adjustment or replacement.

  1. Clicking While Turning

What it sounds like: Rapid clicking from the front wheels, most noticeable during sharp turns.
When it happens: While turning at low to medium speeds.
Likely cause: A worn CV joint.

Fix: Replace the affected CV axle before it fails completely.

  1. Clunking Over Bumps

What it sounds like: A heavy thud or clunk from the suspension.
When it happens: Over potholes or uneven surfaces.
Likely causes:

  • Worn sway bar links
  • Failing bushings
  • Damaged struts

Fix: Full suspension inspection and part replacement as needed.

  1. Grinding When Braking

What it sounds like: Harsh metal-on-metal scraping.
When it happens: Any time you apply the brakes.
Likely cause: Worn-out brake pads.

Fix: Immediate brake service. Usually includes pads and rotors.

  1. Humming or Whirring That Gets Louder With Speed

What it sounds like: A low-pitched hum that increases with speed.
When it happens: Constantly, especially on highways.
Likely cause: Worn wheel bearings.

Fix: Replace the affected hub assembly before safety becomes a concern.

  1. Rattling From Under the Car

What it sounds like: Metallic rattle from underneath.
When it happens: While driving or idling.
Likely causes:

  • Loose heat shield
  • Broken exhaust hanger
  • Failing catalytic converter

Fix: Repair or secure affected components.

  1. Whining Under the Hood

What it sounds like: A rising-pitch whine.
When it happens: During acceleration.
Likely causes:

  • Power steering pump
  • Alternator bearings
  • CVT transmission wear

Fix: Diagnostic check to identify and address the component.

  1. Engine Ticking or Tapping

What it sounds like: Rhythmic ticking from the engine bay.
When it happens: Especially when cold or idling.
Likely causes:

  • Typical for Subaru Boxer engines
  • Low oil
  • Valve train wear
  • Sticking fuel injectors

Fix: Check oil first; service if ticking persists or worsens.

  1. Popping Sound From the Rear

What it sounds like: A sharp pop or knock.
When it happens: Over bumps or while turning.
Likely cause: Worn sway bar links or strut mounts.

Fix: Suspension inspection and part replacement.

  1. Whooshing or Hissing From the Dashboard

What it sounds like: Airflow or suction noise.
When it happens: Adjusting HVAC or defrost.
Likely causes:

  • Vacuum leak
  • Failing blower motor
  • HVAC door malfunction

Fix: HVAC system inspection and airflow test.

When to Worry (and When Not To)

Some Subaru sounds are normal. Don’t panic if you hear:

  • Light ticking at startup
  • Fan noise after shutdown
  • Soft fuel pump hum

But don’t ignore:

  • Grinding
  • Persistent loud clicks or clunks
  • Sudden new noises

Noise Diagnosis: Why a Dealership Helps

Subaru dealerships like Subaru of Dayton use:

  • Chassis ears
  • Stethoscopes
  • Subaru OEM diagnostic tools

Trained techs can quickly isolate normal sounds from major issues — especially on Boxer engines and AWD systems.

Keeping Your Subaru Quiet — and Healthy

✅ Stick to your oil change schedule
✅ Rotate tires every 5,000–6,000 miles
✅ Inspect brakes and suspension at each service
✅ Get an annual multi-point inspection

Final Thought: Your Subaru Is Speaking — Are You Listening?

Noises are never random. Pay attention, and your Subaru will reward you with smoother, quieter, and more reliable driving for years to come.