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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.