Diagnosing car noises: clicks, clunks, squeals, and grinding decoded
A noise-to-diagnosis guide that helps you describe the problem accurately to your mechanic — and know whether it's safe to keep driving.
A rhythmic clicking when turning at low speed, especially in a FWD car, is almost always a worn CV joint. The outer boot has cracked, the grease has flung out, and the joint is dry. Budget $300-600 per axle. It's safe to drive short distances but will eventually fail completely.
A clunking over bumps from the front end points to worn sway bar end links ($100-200), ball joints ($200-400), or strut mounts ($400-700). Have a helper bounce the front of the car while you look underneath — the failing part will visibly move. Worn ball joints are a safety concern because a complete failure means the wheel tucks under the car.
A squeal on cold start that goes away after a minute is typically a worn serpentine belt ($80-150 replacement). If the squeal happens only when turning the steering wheel to full lock, the power steering pump is starving for fluid. A persistent high-pitched whine from the engine bay that rises with RPM suggests a failing alternator bearing or water pump.
Grinding from the wheels: if it happens only while braking, the brake pads are metal-on-metal (see our brake article). If it happens while driving in a straight line and gets louder with speed, a wheel bearing is failing ($300-600 per corner). Wheel bearing noise often sounds like a distant airplane and changes tone when you sway the car left or right.
Information is for educational purposes only. Always consult a qualified mechanic for diagnosis and repair. AutoAt's knowledge base is AI-assisted and regularly updated but may not reflect the most current manufacturer specifications. Always verify critical specifications with official service manuals. Repair procedures described here may require professional tools, training, and certifications. Attempting repairs beyond your skill level can be dangerous.