Do you hear a low-pitched hum while driving?

Does it get louder when you accelerate or make a turn?

Does it disappear magically when the vehicle is turned the other way or when it touches a certain speed limit?

No there is no ghost in there, but certainly some technical fault in your car.

We keep getting feedback when our body system becomes ill. The same goes for the mechanical system of a car. Our four-wheeler keeps giving us the signals, but most of us just ignore it. Let’s know when and why a car makes a humming noise.

Common Reasons Car Makes Humming Noise

1. Cupped or Feathered Tires

Suspension and alignment issues lead to tire wear. Resultantly, cupping and feathering generate humming noise because of the rough tread. This calls in the need for tire replacement.

Additionally, the weight distribution, brakes, and a curb hit are some other possible reasons for wearing down your car’s tires. In such cases, tire rotation improves traction, enhances the lifespan of tires, while preventing the possibilities of emergency tire repair.

2. Misaligned Wheels

If you are wondering ‘why does my car make humming noise’ then this could be the possible reason for it. Sometimes the alignment angles don’t align the wheels properly they start to make a humming noise. In such cases, one of the tire’s scuffs sideways and don’t roll forward like usual.

The noise may increases when the vehicle moves and eventually it results in loss of traction. Wheels realignment is the best solution to get rid of this issue and the ‘hum’ noise will go away automatically.

Also, Read: Symptoms of Bad Wheel Alignment

3. Wide Tires/Non-Directional Tread Patterns

The cars with wider tires or non-directional tread patterns generate humming noise. When the tires are wider in size more part of the tire’s rubber comes in contact with the surface (road). This means more traction and more noise. However, if you’ve got the tires changed recently you shouldn’t be worrying if you hear some noise, as its normal.

4. Low-Quality Tires

They generate more noise in comparison to high-profile tires. The sidewalls of low-profile tires don’t have enough rubber. As a result, the chassis transmits the noise. It could also be the possible cause of the car making humming noise from the engine. If you’ve got a car with low-quality tires installed to it then it should probably get them changed to get rid of that humming noise problem.

5. Damaged Tires

Cars with flat spots or damage tire generate humming noise when the accelerator pedal is pressed by the driver. Shifted belts and tread separation are known to be some of the common causes of tire noise. Curb hits, defective construction, and tread separation are some other reasons that generate humming noise in the car.

Car Makes Humming Noise When Accelerating

There are several reasons for the car making a loud noise when accelerating. It could be due to faulty transmission, steering, or because of an engine issue. Some of the possible reasons are mentioned below in detail –

1. Leakage in the Exhaust System

A leaking exhaust system or power steering generates humming noise when the car driver presses the accelerator. There could be a leakage either in both the systems or in one of them. Get the engine system of your vehicle checked by a mechanic to get the issue addressed at the earliest. Quick leak repair is important in such cases.

2. Improper Flow of the Transmission Fluid

The low or bad flow of the transmission fluid is another major (possible) condition where the car makes a humming noise. And this is also likely to be the source of the problem. With the lowering level of transmission fluid, the vehicle starts generating disturbances and noises resulting in bad driving experience. If your car makes a humming noise when accelerating get the transmission fluid replaced with a premium quality version.

3. Bad Transmission System Gears

Once you accelerate or speed up your four-wheeler the transmission system of the car gets affected badly if the gears are worn-out. The gears are one of the important parts of a car’s transmission system. With regular uses they get worn-out. Consequently, they cause vibration and noises while the driver tries to accelerate the four-wheeler.

4. Misaligned Steering Wheel

When the steering wheel is turned that causes humming or whining noise when the accelerator is pressed. It should be in a neutral position. If you facing this problem get the alignment problem fixed with the help of an expert mechanic.

Also, Read: Signs of Bad Wheel Alignment

5. Loosened Steering Belt

When the steering belt loosens down car makes a humming noise when accelerating. This could also have some serious impact on your vehicle in the long-term. In the worst cases, it could create accidental issues. Check your car’s steering wheel and replace the steering belt immediately if you find it loose.

Car Makes Humming Noise When Driving

If your car makes a humming noise when driving it could be due to the following possibilities –

1. Worn-out Wheel Bearing

Usually, a moving car generates a loud humming sound when its wheel bearing is worn-out. The sound is similar to that of road noise generated due to bad car tires or the one that comes from worn-out wheel bearings when the level of transmission fluid is low.

A car’s wheel bearing fails either due to small damage or pitting on the bearing race or rollers surface of. The metal of the bearings get worn-out slightly due to continuous wear and tear. The microscopic metal pieces and contamination get into the grease of bearings.

Resultantly, the polished surface starts deforming and pitting. As the surface of the bearing is damaged it causes loud humming or growling noise.

2. Drivetrain Issues

Rough tire surface and driveshaft issues generate abnormal noises. If you hear growling or humming sound while driving your car in a straight line and it worsens when the wheel is slightly turned to the right/left there are higher chances that the sound is related to some of these issues.

Car Makes Humming Noise When Parking

A Car Makes Humming noise when parking in the following scenarios

1. Leakages in The Air Exhaust System

When the leaking air escapes through the leaking exhaust system of a car you’ll hear a loud “humming” noise. Even a small leak in the vehicle’s air intake/exhaust system can accentuate noises. You may face trouble when driving or parking your vehicle due to the leakage. So seek the help of a certified professional at the earliest.

2. Faulty Coil Packs

The worn-out ignition coil not only affects the performance of the car’s engine but also generates noise when the vehicle is being parked. The possible causes for bad coils packs are misfires, loss in acceleration and power, gas mileage reduction, and others. If left untreated these conditions could affect the vehicle’s performance and lead to engine stalling.

If you catch the above-listed symptoms early your car’s drivability won’t be affected. However, if you ignore the humming noise it may get louder and worsen the condition of your vehicle and result in an expensive repair. Look for a certified professional if the noise has become a part of your daily driving experience.