Scraping And Grinding Noise When Driving: Causes & Solutions

Driving should be a peaceful and enjoyable experience. Unfortunately, grinding noise when driving can quickly turn this serenity into an anxious situation. So when this happens, it’s important to understand what could cause the noise so that you know how to properly diagnose it and take action if necessary. 

This article will discuss potential causes of a grinding noise when driving, provide a guide on how to identify and diagnose the problem, and also give a few maintenance advice for avoiding similar issues in the future. 

So if your car has been making any suspicious sounds while in motion lately, then read through this guide before taking further steps!

What Is a Grinding Noise?

A grinding noise is an audible sound that comes from your vehicle when something isn’t working correctly. It may sound like metal scraping against metal or a loud buzzing or humming sound coming from the engine bay. The noise will usually get louder as you accelerate, but it could also occur at any speed.

Most car owners experience this at some point. The sound is often different and more severe than the squeaking sound, which often is a wear indicator alerting the driver when it’s time to change the brake pads.

Unfortunately, many things can be the culprit of the grinding noise. So understanding the causes and how to identify them is important in order to diagnose the issue quickly and accurately.

What Causes Grinding Noise When Driving?

The most common cause of a grinding noise when driving is something rubbing against the brake rotors. This can be small stones, dirt, or debris finding its way in between the caliper and the rotor. But also because of excessively worn brake pads if it occurs when braking.

While there are many possible causes for grinding noises in cars, from worn pads to loose belts or pulleys or even transmission issues. Here are the most common reasons you might hear a scraping or grinding noise when driving:

1. Worn Out Brakes

One of the most common causes of grinding noises when driving is problems with the braking system. This can either be the brake pads themselves, dirt or debris stuck between the caliper and the rotor, a sticking brake caliper, or if the brake shims somehow start grinding against the rotor. 

For example, when the pad life becomes too thin from wear and tear, it may begin to make a loud scraping sound as the metal parts of the pad start rubbing against the rotor while braking

But no matter the cause, any brake issues should be addressed immediately as continued use can lead to more expensive repairs down the road, such as replacing warped rotors or damaged calipers.

Read more: Ceramic vs Semi-Metallic Brake Pads: What’s the Difference?

2. Rusty Brake Rotors

The brake rotors, which are a part of disc brakes, are flat metal discs whose job is to slow the vehicle down when the calipers press the pads together. But if you don’t drive your car enough, over time, the brake rotors may begin to rust.

If the rust on the rotors is minimal, you may not notice any issues when driving the car – but you may hear a grinding noise. This grinding noise is caused by the rust on the rotors rubbing against the brake pads, causing a rough, abrasive sound.

If it’s only a small amount of rust, the grinding noise will likely go away on its own after you drive the car a few times. However, if the rust is more severe, you may need to have the rotors resurfaced or replaced to fix the problem.

Here is a great article on how to tell if the rotor is bad. Make sure to read it if you find yourself in this situation.

3. Worn Wheel Bearings

Another potential cause for grinding noises could be worn wheel bearings which are responsible for allowing your wheels to rotate freely without excessive friction or vibration while driving at high speeds. If these bearings become loose over time, they will start making an unpleasant grinding sound that should not be ignored, as it could eventually lead to catastrophic failure if left unchecked for too long.

As the wheel bearings often are integrated into the wheel hubs assembly, it likely means the whole wheel hub assembly needs replacing.

4. Failing Alternator

An alternator is a device in a vehicle that generates electricity to power the vehicle’s electrical systems and to charge the battery. It does this by using a belt that is connected to the engine to spin a rotor inside a stationary set of conductors, which generates electricity through electromagnetic induction.

If the alternator is faulty, it can cause a grinding noise when driving for a few different reasons. One possibility is that the belt that drives the alternator is slipping or misaligned, which can cause it to make a grinding noise as it tries to turn the alternator. 

Another possibility is that the bearings in the alternator are failing, which can cause a grinding or humming noise as the alternator tries to rotate. In either case, it is important to have the problem addressed as soon as possible, as a faulty alternator can cause a vehicle to lose power or even break down completely.

5. Worn or Damaged CV Joint

A CV joint (short for constant velocity joint) is a mechanical component that allows rotational power to be transmitted at a constant speed even as the angle between the driving and driven shafts changes.

The bearings in a CV joint can become worn out over time, or they may be damaged if the joint is subjected to excessive force. In addition, the CV joint has a protective boot that helps to keep dirt and debris out, as well as keep the joint lubricated. If the boot is damaged, this can dry or damage the join, causing it to make a grinding noise as it rotates.

6. Transmission Problems 

Lastly, another possible source of grinding sounds could come from a faulty transmission system which consists of several components including gears, clutches and other moving parts that work together in order for your car’s engine power to reach its wheels efficiently and safely.

If any one part becomes damaged due either age or lack of maintenance, then this could result in an annoying grinding noise coming from underneath your vehicle’s hood area indicating something needs attention right away before more costly repairs are needed later on.

It’s important to know the warning signs of transmission problems so that you take action quickly by having these issues inspected by qualified mechanics.

Neglecting to do so increases the chances of further damage, and you may end up paying much more money on costly repairs than necessary.

How to Diagnose Grinding Noise When Driving?

It’s important to diagnose the cause of this sound in order to prevent further damage and ensure the safe operation of your vehicle.

To identify the source of grinding noise, the key is to first pay attention to where and when it occurs. Is it when driving at a constant speed, accelerating, or does it significantly increase when turning the vehicle? Knowing this will help narrow down which component may be causing the noise. 

Additionally, listen for any changes in pitch or volume, as this can also provide clues about what part of your car is affected.

If the noise only occurs when driving and doesn’t seem to change much when driving at a constant speed, the first step is to inspect the brakes for any signs of wear or tear. Make sure nothing is stuck between the caliper and the rotor and that the overall condition of the brakes is good.

However, if the grinding noise when driving gets worse as you apply the brakes, as well as vibrations in the steering wheel, you want to check your brake pads and brake rotors extra carefully.

If there are no visible issues with the brakes, then it may be necessary to check if the wheel bearing is damaged or worn out. To do this, you will need to jack up each wheel individually and spin them by hand while listening for any unusual sounds that could indicate problems with the bearings.

But, if there is a grinding noise when accelerating, it points to the alternator. Lift the hood and locate the alternator. Listen for any unusual noises, and while you’re at it, pay attention to the water pump and power steering pump – as they also sometimes make noises when they’re about to give out.

If inspecting these components does not reveal any issues, then it may be necessary to take your car to an auto repair shop to have a professional inspect the transmission for potential problems, such as worn gears or other mechanical failures that could cause grinding noises when driving. 

This should include checking fluid levels, loose belts or pulleys, and ensuring all connections are secure before taking your car out on the road again.

PRO TIP: To identify the source of a grinding noise, pay attention to where and when it occurs. Many times this can help you narrow down the potential cause.

How to Fix Grinding Noise When Driving

At this stage, you probably figured out what is causing the unpleasant noise. However, the level of difficulty in fixing the issue can significantly vary depending on the cause itself.

If brake problems cause the issue, you’ll need to replace the worn brake components, such as the pads or rotors, in order to fix it. This is often something a mechanically inclined DIY mechanic can do at home, even for a beginner. Make sure to follow the proper changing process and carefully test drive after any repairs.

Here’s a complete guide on changing brakes by ChrisFix:

However, if it’s the alternator, water pump, or power steering pump causing the buzzing noises, it’s not often any harder than replacing the brakes. But note that the level of difficulty can vary greatly depending on the make and model of your vehicle.

However, fixing worn wheel bearings, failing CV joints, or transmission problems are often a complex type of repair that requires specialized tools and equipment.

So if you are not confident in your ability to perform any of these repairs safely and correctly, including changing brakes, it is best to take your vehicle to a professional auto repair shop. 

They will have the knowledge, experience, and tools to properly diagnose and fix the issue, ensuring that your vehicle is safe and reliable to drive.

Improperly repairing these issues can lead to further damage to your vehicle and potentially put you in dangerous situations.

Cost Considerations for Fixing The Problem

When considering repairs related to a grinding noise issue in your vehicle, cost is always an important factor to consider before making any decisions about how you want to proceed with repairs. 

Depending on what type of repair needs to be done, costs can range anywhere from just replacing basic parts like brake pads or an alternator to more expensive options like replacing entire axle assemblies. 

Replacing brake pads usually comes down to about $150 per axle. Where fixing axle assemblies or transmission issues can cost a lot more than $1000 in the worst case. 

It’s always best practice to get multiple quotes from different mechanics, so you have an idea of what kind of price range you’re looking at before committing to anything.

Tips for Keeping Your Car in Good Working Order

To ensure that your car remains in good working order, it’s always recommended to follow the manufacturer’s maintenance guidelines. It’s also important to take care of minor issues before they become major ones. 

This means paying attention to any strange noises or smells coming from the engine or exhaust system, having fluid levels checked regularly, and keeping an eye out for any warning lights on the dashboard.

It’s also a good idea to check tire pressure often and rotate tires every few months so that they wear evenly over time. So do not neglect routine maintenance such as oil changes; this will help extend the life of your vehicle significantly.

By following these preventative maintenance tips, you can help to ensure that your car is in good working order and minimize the chances of experiencing grinding or scraping noises when driving. 

Frequently Asked Questions

Is It Safe to Drive With a Grinding Noise?

It is generally not safe to drive a car with a grinding noise. Grinding noises can be a sign of a serious problem with your vehicle, such as worn brakes or a failing transmission. Continuing to drive with a grinding noise can cause additional damage to your vehicle and may pose a safety risk to you and other road users

Why Does My Car Sound Like Scraping Metal When I Drive?

A scraping metal sound when driving could be caused by many things. However, the most common cause is that something is rubbing against the brake rotors. This can be small stones, dirt, or debris finding its way in between the caliper. But also because of loose brake components after a faulty brake installation.

What Is Grinding Noise In Front Wheel?

If you hear a whirring, knocking, scraping or grinding noise from the front wheel when driving your car, it could mean you have a bad wheel bearing or a failing CV joint. The noise may be more noticeable when turning or when accelerating. In some cases, the CV joint may also cause a clicking noise when turning.


It is important to diagnose the problem correctly in order to determine the best course of action for repair. If you are unsure what the cause may be, it’s recommended that you take your car to a professional mechanic for further inspection and advice. With proper preventative maintenance and regular check-ups, you can avoid having to deal with any grinding noise when driving in the future.

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Rickard Cefalk

Rickard is the owner of and a dedicated and avid do-it-yourselfer who has always enjoyed working on his own vehicles since childhood. He now devotes his time to sharing his expert knowledge of car maintenance and other car-related information through his website.

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