Why is your car making banging noises when driving over bumps?

If your car is making a loud banging or knocking noise when you go over bumps, it is usually due to a problem in your car’s suspension system. However, other things such as engine and transmission mounts are known to cause banging noises.

Your car’s suspension system consists of several different components which work together to absorb bumps, inconsistencies and impacts. This allows for a smoother driving experience, especially on bumpy terrains.

Learn more about how the suspension works

There are several different steering and suspension components which can fail, leading to loud noises, shaking and reduced control after driving over a bump in the road. Below are some of the most common causes:


Leaking shock absorbers:

The shock absorbers work with your suspension system to absorb bumps in the road. Inside a shock absorber, pistons flow through oil to generate heat, which reduces vertical motion in each wheel. Damage to the shock absorber(s) can cause this oil to leak. As oil leaks, the shock absorber will produce rattling or banging noises as you go over bumps in the road.

Shock absorber replacement in Hamilton

Worn ball joints:

Ball joints are important suspension components which connect the control arm to the steering knuckles. Their purpose is to allow for smooth operation of the suspensions system. Over time, the nylon sockets in ball joints can wear. This can lead to noisy operation.

Ball joint replacement in Hamilton

Loose or damaged exhaust components:

A loose or damaged exhaust system can also produce banging noises. Check for any loose or broken hangers, brackets, or exhaust pipe connections. If any of these components are damaged or not securely fastened, the exhaust system can move and hit other parts of the vehicle, resulting in banging noises.

Exhaust repairs in Hamilton

Worn steering rack bushings:

Your car’s steering rack connects to the steering wheel. The ends of the steering rack then connect to the front wheels. Sometimes, the bushings that mount the steering rack in place will become loose. This can lead to loud noises and vibrations when going over bumps.

Steering rack bushing replacement in Hamilton

Loose engine or transmission mounts:

Inside your car are several mounts that hold the engine and transmission in place. These mounts carry a heavy weight and this can lead to them failing over time. When they fail, the engine or transmission will become more prone to moving when the car goes over bumps. The result of this is loud banging or crashing noises which are accompanied by powerful vibrations.

Engine mount replacement in Hamilton

Loose brake components:

Banging noises can also be related to brake issues. Loose brake calipers or brake pads that are not properly seated can cause banging sounds when driving over bumps. Additionally, worn brake components can result in brake rattles or noises that may be mistaken for banging sounds.


Is it safe to drive if your car is making loud banging noises?

We recommend avoiding driving if your car is shaking, banging or producing other loud noises where you’re unaware of the source. If you need to drive, avoid bumps where possible, as these will cause increased wear on the affected components.

Banging noises can indicate significant problems with your vehicle, some of which can pose safety risks or lead to further damage if ignored. Each impact (even smaller ones) causes wear to surrounding components, leading to more serious issues when unattended. It can also lead to you failing your Warrant of Fitness.


Diagnosing vehicle banging noises in Hamilton:

Is your car producing loud banging noises when you go over bumps? If so, we can diagnose and repair the problem for you. Whether it is a failed engine mount, shock absorber ball joint or another component, our team of skilled mechanics can quickly repair the problem.

If your car is making loud noises and you need it fixed, contact Grimmer Motors today1


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