Why your car makes a clunking noise over bumps
A clunking noise when driving over bumps usually means something in the suspension or steering system is loose, worn, or damaged. These components absorb road impacts, so when they fail, you’ll hear knocking, clunking, or rattling sounds from the front or rear of the vehicle.
If you’re unsure where to start, you can browse more troubleshooting guides on the blog or review common questions on the FAQ page.
1. Worn sway bar links
Sway bar links connect the sway bar to the suspension. When the bushings or ball joints wear out, they create a sharp clunk when the suspension moves.
Symptoms: clunking over small bumps, loose feeling in corners, rattling at low speeds.
2. Bad struts or strut mounts
Struts support the vehicle and absorb impacts. When the internal components wear out or the strut mount fails, you may hear a heavy clunk when hitting bumps.
Symptoms: excessive bouncing, uneven tire wear, knocking from the top of the wheel well.
3. Worn control arm bushings
Control arm bushings cushion the suspension. When they crack or deteriorate, the control arm can shift and create a dull clunking sound.
Symptoms: clunking over bumps, wandering steering, vibration under acceleration.
4. Loose or damaged ball joints
Ball joints allow the suspension to pivot. When they wear out, they can produce clunking noises and cause dangerous handling issues.
Symptoms: clunking when turning or hitting bumps, uneven tire wear, loose steering.
5. Loose steering components
Loose tie rods, steering rack mounts, or other steering parts can create knocking noises when the suspension moves.
Symptoms: play in the steering wheel, vibration, or inconsistent steering response.
6. Broken or loose exhaust hangers
Sometimes the noise isn’t suspension-related at all. A loose exhaust pipe or broken hanger can cause the exhaust to hit the underbody when going over bumps.
Symptoms: metallic clunking, noise from the center or rear of the car.
When to stop driving
Stop driving if the clunking becomes loud, the steering feels unstable, or the car pulls to one side. These symptoms can indicate a failing ball joint or major suspension issue that could lead to loss of control.
If you need help or want to reach out, you can use the details on our Contact page.