Quick Answer: Why Strange Noises?
Strange car noises are your vehicle's way of alerting you to problems. Squealing often indicates worn brake pads or belts (55% of cases), grinding suggests brake or bearing issues (15%), while knocking points to engine problems (10%). The type, timing, and location of the noise are key to accurate diagnosis.
Common Causes & Solutions
Brake Pad Wear
35%Metal-on-metal grinding when braking. Squealing that stops when braking.
Serpentine Belt Issues
20%High-pitched squealing on startup or acceleration. Gets louder when wet.
Wheel Bearing Failure
15%Humming or growling that changes with speed. Gets louder when turning.
Exhaust System Damage
10%Loud rumbling, rattling, or hissing. May smell exhaust fumes.
CV Joint Problems
10%Clicking or popping when turning. More noticeable at low speeds.
Engine Knock
10%Rhythmic knocking from engine. May indicate serious internal damage.
Noise Type Identification Guide
🔊 Squealing/Screeching
- ▸On startup: Loose or worn serpentine belt
- ▸When braking: Brake pad wear indicators
- ▸When turning: Power steering belt or low fluid
⚙️ Grinding
- ▸When braking: Worn brake pads (metal-on-metal)
- ▸When shifting: Transmission or clutch issues
- ▸Constant: Wheel bearing failure
🔨 Knocking/Tapping
- ▸From engine: Rod knock, piston slap, or valve issues
- ▸When turning: CV joint or suspension components
- ▸Over bumps: Worn struts or loose exhaust
🌀 Humming/Whirring
- ▸Speed-dependent: Wheel bearings or tires
- ▸From engine bay: Alternator or water pump
- ▸When in gear: Transmission or differential
DIY Diagnosis Steps
Identify the Type of Noise
Is it squealing, grinding, knocking, clicking, or humming? Each sound points to different components. Record the noise on your phone if possible.
Note When It Occurs
Does it happen when braking, turning, accelerating, or at idle? Timing helps narrow down the source significantly.
Locate the Source
Is it from the front, rear, left, right, or under the hood? Have someone else drive while you listen, or safely check while parked.
Check for Other Symptoms
Any vibrations, pulling, warning lights, or performance issues? Multiple symptoms help confirm the diagnosis.
Use AI Diagnosis
Input all observations into our tool for instant analysis. Get specific causes and repair estimates based on your exact symptoms.
Frequently Asked Questions
What do different car noises mean?
Different noises indicate specific problems: Squealing often means worn brake pads or belts, grinding suggests brake issues or transmission problems, knocking indicates engine issues, and squeaking could be suspension or belt problems.
Should I stop driving if my car is making strange noises?
It depends on the noise. Grinding brakes, loud knocking from the engine, or any noise accompanied by warning lights requires immediate attention. Mild squeaks or rattles can usually wait for scheduled service.
How much do noise-related repairs typically cost?
Costs vary: Belt replacement £50-150, brake pads £150-300, wheel bearings £200-500, exhaust repairs £100-400, or engine repairs £500-3000+. Always get a diagnosis first to identify the exact issue.
Can I diagnose car noises myself?
Yes, you can identify many issues by noting when the noise occurs (braking, turning, accelerating), where it comes from, and what it sounds like. Our AI tool helps match these symptoms to likely causes.