Car Making Humming Noise When Parked – Why And How To Fix?

Have you ever heard a humming noise in car when parked? If so, you’re not alone.

This noise can be caused by several issues, from problems with your manual transmission to matters with your power steering system.

In this post, we’ll explore some of the most common causes of car making humming noise when parked and provide some tips on fixing them.

Why Is Car Making Humming Noise When Parked?

car making humming noise when parked
Car Makes Humming Noise When Parked

In an automobile, a car makes humming noise when parked may be audible for several reasons, such as electricity, fuel, AC system, brakes, inner CV joint, a broken alternator, water pump bearing, transmission oil level, and wheel balancing.

Knowing the specific source of the humming sound is crucial since it might point to a significant issue that requires professional repair.

Electric system

If your car is making a humming noise, it may be due to a weak or failing battery or a malfunctioning electrical component.

When the alternator works harder than usual to charge a weak battery, it can produce a humming sound.

Similarly, a short circuit or faulty wiring in the electrical system can cause various components to emit a humming noise.

Fuel system

A car making a humming noise when stopped could signal a serious problem with the fuel system. The fuel pump may be malfunctioning, causing the noise.

Alternatively, debris in the fuel lines can also lead to a humming sound.

If you’re experiencing other symptoms like difficulty starting your car or poor performance, the fuel pump will likely need to be replaced.

Air conditioning system

Your car’s air conditioning system can also be a culprit for a humming noise in a parked car.

When the compressor or other components of the AC system fail, they can produce a whining noise when you turn on the AC.

If your car appears to have other symptoms, like warm air blowing from the vents or a strange odor, your AC system likely needs repair.


If your parked car produces a grinding or droning noise, it may be due to worn brake pads. As the pads’ metal rubs against the rotors, it can create a humming sound.

Other symptoms of worn brake pads include difficulty stopping or a pulsing sensation in the brake pedal. Replacing the brake pads should resolve the issue.

Inner CV joint

If you hear your car making loud humming noise, it may be due to a failing inner CV joint.

The inner CV joint is part of the driveshaft and helps transfer power from the transmission to the wheels.

Signals of a bad CV joint include vibrations or strange noises while driving. Thus, replacement of the CV joint is usually necessary to fix the issue.

Broken alternator

A busted alternator can also cause your car making a humming sound. The alternator is in charge of charging the battery and generating power for the electrical system.

If broken, it can create a rattling sound even when the car is parked. Other symptoms include dimming headlights or a dead battery. Replacement of the alternator is necessary to fix the issue.

Water pump bearing

If your car produces continuous humming noise when parked, it may be due to a failing water pump bearing. The water pump circulates coolant through the engine to prevent overheating.

Indications of a failing water pump bearing include overheating or coolant leaks. Replacement of the water pump is necessary to fix the issue.

Transmission oil level

Low transmission oil level or issues with the transmission can also cause the car makes noise when parked.

Transmission issues symptoms include slipping gears, difficulty shifting, or a burning smell. Repair or replacement of the transmission may be necessary to fix the problem.

Wheel balancing

If your parked car produces a humming noise, it may be due to improper wheel balancing.

This bad sign is typically more noticeable at highway speeds, but you may still hear the noise when the car is parked. Getting your wheels balanced or rotated can help resolve the issue.

How To Fix The Car Making Humming Noise When Parked Problem? 

car makes noise when parked
Repair To Car Making Humming Noise When Parked Problem

If your car generates an annoying sound while stopped, it can indicate an underlying issue. Here are some potential solutions to fix the car making buzzing noise when off problem:

Electric system

A weak battery or a faulty alternator can lead to continuous humming noise. You may need to replace or repair the affected component to troubleshoot this.

A mechanic must diagnose and fix the issue if there is a short circuit or malfunctioning wiring.

Fuel system

A humming noise caused by a clogged fuel filter can be solved by replacing it or having a mechanic do it.

If the fuel pump is the issue, check the fuel system and consult the mechanic for appropriate repair.

Air conditioning system

Common car noise from the air conditioning system can indicate a problem with the compressor or a loose belt. Bring your car to the repair shop for diagnosis to solve the problem.


Worn brake pads can cause a humming or clicking noise. To fix this, you will have to change the brake pads. If the rotors are damaged, they may also need to be replaced.

Replace Wheel Bearings

If bad wheel bearings cause common car sounds, a mechanic should replace them.

Driving with worn-out wheel bearings can cause serious damage to your car, so it’s essential to address this issue promptly.

Regular maintenance

Regular maintenance prevents humming noises and ensures your car runs smoothly.

Routine checks, such as oil changes and tune-ups, can help prevent issues before they become larger problems.

Other factors

If none of the above solutions work, other underlying issues may exist. A professional can diagnose the problem and advise you on the best action.

Taking your car to a trusted mechanic and promptly addressing any issues can prevent further damage and ensure your vehicle runs smoothly.

Frequently Asked Questions

car making humming noise when stopped
Question Of This Problems

Is A Humming Noise When Parked Normal?

No, a humming noise when parked is not normal and can indicate an underlying issue with your vehicle.

While some cars may produce a low-level humming sound due to their design or the environment they are parked in, a loud or persistent humming noise is not normal and should be investigated by a mechanic.

Ignoring this type of noise can lead to further damage to your car and potentially put you and other drivers at risk if the issue affects the car’s ability to function properly.

The best solution is to get your car inspected by a professional who can identify the issue and suggest a fix if you hear a humming noise while driving or parking.

Can Transmission Make Humming Noise?

Yes, a transmission can make a humming noise.

A humming noise from the transmission can indicate a problem with the transmission’s internal components, such as worn-out bearings or gears.

The noise may become more noticeable as the car accelerates or decelerates.

If you suspect that your transmission is making a humming noise, it’s essential to have it examined by a technician as soon as possible.

Ignoring the problem can lead to further damage to the transmission and potentially result in a costly repair bill.

It’s always better to promptly address any issues with your vehicle to keep it running smoothly and prevent further damage.

Can A Humming Noise When Parked Damage My Car?

In most cases, a humming noise when parked is not likely to cause immediate damage to your car.

However, it can indicate an underlying problem that, if left unaddressed, could lead to deterioration over time.

Additionally, if the humming noise is caused by a problem with the transmission or another critical component, continued driving could cause further damage and lead to a breakdown or more severe problems.


If you hear a car making humming noise when parked, don’t ignore it. This could indicate a serious problem, such as transmission or electric system issues.

Getting your car inspected by a professional mechanic and addressing the underlying issue ensures your automobile runs smoothly and safely.

Those experiencing this issue take action and get their car back in shape.

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