Cars have their own way of communicating. Through squeaking, screeching, roaring, knocking, and squealing, they signal that something has gone wrong. Learning to recognize and interpret the noises your vehicle makes is absolutely essential.
Not sure how to decode what your vehicle is trying to tell you?
Below is a practical guide to common car noises and their underlying causes.
Squealing from beneath the hood is often a telltale sign of a loose or worn serpentine belt. These sounds frequently come paired with performance problems like power steering failure or unexpected battery drain.
The serpentine belt is central to your car's operation. This long rubber belt transfers power to engine accessories such as the alternator, water pump, power steering pump, and air conditioning compressor.
Without it, your car simply will not function.
So if screeching sounds emerge from under the hood, get your vehicle inspected promptly. A mechanic will evaluate the serpentine belt and determine whether replacement is necessary. Automotive professionals recommend replacing the serpentine belt every 96,000 km to 160,000 km.
A knocking sound from under the hood during acceleration can be a sign of asynchronous fuel combustion.
Under ideal engine conditions, fuel within the cylinder ignites uniformly. When combustion becomes uneven, it may point to damaged engine components. Common culprits include worn bearings, faulty knock sensors, and defective spark plugs. Improper lubrication, carbon buildup, and low oil pressure can also trigger engine knocking.
Regardless of what is causing the knocking, have the issue professionally diagnosed without delay.
Although newer vehicles feature advanced electric power steering, the majority of cars on the road still rely on conventional hydraulic power steering systems.
Like all hydraulic systems, hydraulic power steering depends on fluid to function properly. When power steering fluid runs low, air infiltrates the system and generates a variety of unpleasant sounds — whining and squeaking being the most common whenever you turn the wheel.
To address this, check the power steering fluid level first. If it reads low, top up the reservoir. Should the noises persist after refilling, bring the vehicle to your technician.
A steady humming sound during acceleration may be a sign of worn or underinflated tires. When you detect that low droning from the tires, investigate the root cause. Have a technician check tire pressure and then inspect tread depth and overall tire wear.
On top of that, commit to routine tire maintenance to limit uneven wear and early deterioration. This includes practices such as tire rotations, wheel alignment, and swapping tires according to the season.
Roaring sounds typically point to a damaged exhaust system.
Under normal operation, exhaust gases travel through a muffler that absorbs much of the roaring noise. When the exhaust system is compromised, however, gases escape before reaching the muffler, producing loud roaring sounds from beneath the driver's seat.
Beyond the noise and vibrations, a faulty exhaust system can allow carbon monoxide to seep into the cabin. If you experience any of these symptoms of exhaust damage, contact your mechanic immediately.
A persistent rumbling noise while the engine idles may stem from an incorrect air-fuel mixture. Your engine requires both elements in precise proportions, and when either is off, the vehicle can produce rumbling sounds that are often accompanied by vibrations at low speeds.
What leads to an imbalanced air-fuel mixture?
Several factors can be responsible. Clogged fuel injectors, for instance, restrict the correct amount of fuel from entering the system. Similarly, a dirty air filter limits the oxygen available to mix with the fuel. Using Valvoline's service fluids to clean these components can be a solid first step.
Faulty spark plugs can also produce rumbling. When they fail to ignite properly, they create inconsistent combustion, which leads to rumbling. In this situation, have your spark plugs replaced and ask your mechanic for further maintenance guidance.
Your vehicle is constantly giving you feedback. The question is whether you are paying attention.
Car noises are frequently signs of serious underlying performance problems. Dismissing them will not resolve the issue.
Instead, schedule regular inspections and invest in proper maintenance for your vehicle. A great place to begin is by selecting high-quality lubricants and service products.
At Valvoline, we take pride in offering our full line of high-performance lubricants. For over 150 years, we have been developing and refining our automotive and industrial lubricants to meet the evolving needs of our customers. From engine oils and coolant formulas to workshop products, Valvoline has everything required to keep your vehicle running at its best.