4 Causes Of A Whining Noise When Accelerating

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Strange noises ruin road trips fast. Some of the most common, yet aggravating irregular vehicle sounds, are those that present a whining or whirring noise when accelerating.

In truth, there are many potential causes of a whining noise when accelerating, which typically calls for extreme attention to detail during the diagnostic process. Read on to learn more.

Table of Contents

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• Common Causes of Whining Noise When Accelerating
  • #1 – Transmission Issues
    • Severity
  • #2 – Bearing Wear of Belt Driven Components
    • Severity
  • #3 – Dry, Cracked, or Slipping Serpentine Belt
    • Severity
  • #4 – Worn Wheel Bearings
    • Severity

Common Causes of Whining Noise When Accelerating

There is a rather large number of potential causes for your vehicle’s whining noise, many of which are frequently heard by an untold number of motorists on an annual basis. The following are several of the most common causes of vehicle whine during acceleration.

• Internal transmission issues
• Worn alternator bearings
• Damaged water pump bearings
• Low power steering fluid
• Faulty A/C compressor
• Tensioner/idler pulley issues
• Dry, cracked, or slipping serpentine belt
• Worn wheel bearings

The following is a more in-depth explanation, regarding the individual causes of vehicle whine listed above. For the sake of simplicity, these causes have been subdivided into four separate categories.

#1 – Transmission Issues

A vehicle’s transmission serves an extremely vital function and is key to distributing engine power to a car, truck, or SUV’s drive axles. Unfortunately, transmissions are prone to internal failure with age.

In certain cases, a failure of this nature can present an audible whining noise. Noises of this type can often prove difficult to locate, especially when resonating from a vehicle’s transmission tunnel.

A whining sound from your vehicle’s transmission is generally indicative of a fluid-related issue. It is quite common to hear a noise of this nature, when a transmission’s fluid level is reduced beyond capacity, or when a transmission fluid pump begins to fail.

Additionally, a failing torque converter can also present a whining noise. Internal bearing wear often presents a roaring noise, which can be mistaken as a whine, at high speeds.

Severity

In most cases, the onset of a whining noise from a vehicle’s transmission is considered to be quite serious in nature. In the case of a faulty torque converter, the replacement will necessitate transmission removal.

The cost associated with such repairs is often steep, typically commanding a labor price in excess of $1000. If a failing internal bearing is to blame for your transmission’s whining noise, the associated cost for repair will be exponentially higher.

#2 – Bearing Wear of Belt Driven Components

A vehicle’s engine features numerous belt-driven accessories. Each of these accessories utilizes a drive pulley, along with one or more sets of bearings.

A serpentine belt transfers the rotational force of the crankshaft pulley, to the pulleys associated with various additional belt-driven accessories. These accessories include an engine’s water pump, power steering pump, A/C compressor, and alternator. Additionally, systems of such a design also feature tensioners and idler pulleys.

Supercharged vehicles may also experience whining noises from a failing supercharger, which is another belt-driven component

When the bearings associated with any of above-mentioned components begin to fail, a whining noise is often heard. Perhaps the most pertinent example of this situation comes in the form of an alternator, with bad internal bearings. As these bearings fail, a loud whining or screeching noise can be heard over the sound of typical engine operation.

Power steering pumps also tend to present a fair amount of noise with enough wear. Alternatively, one can expect to hear such sounds when a power steering pump is low on fluid.

Severity

Faulty accessory drive components also require prompt diagnosis and replacement. A failure to remedy such concerns can lead to locked up bearings and a shredded belt, ultimately leaving you stranded on the road.

Because most modern vehicles rely upon a single serpentine belt to drive all associated accessories, a single locked up component can render the rest of a vehicle’s belt-driven accessories inoperable.

#3 – Dry, Cracked, or Slipping Serpentine Belt

As mentioned above, a vehicle’s serpentine belt drives a number of components that are essential to vehicle operation. However, a belt is only able to drive these accessories, if it is in optimal shape.

With time, a serpentine belt can begin to dry out and crack. As a result, a belt is unable to grip the pulleys of the various accessories that it drives, in as efficient of a manner as desired. This inevitably leads to belt slippage, which only increases in severity with the passage of time.

As a serpentine belt slips along the outer diameter of various pulleys, the resulting friction can produce a significant amount of noise. These sounds are perhaps best described as a whining or squealing noise, which tends to increase in intensity during acceleration. This additional friction can also further damage an already worn serpentine belt, ultimately leading to failure.

Severity

In many cases, the whining or squealing of a serpentine belt is more of an annoyance, than anything, and carries little risk of creating additional issues if not addressed immediately.

However, a severely worn or damaged serpentine belt can snap, or be thrown from the pulleys on which it rides. When this occurs, the function of all belt-driven accessories will be compromised, ultimately leaving you stranded.

See Also: How to Reduce Window Noise While Driving

#4 – Worn Wheel Bearings

Wheel bearings bear the responsibility of ensuring that our vehicles’ wheels spin freely when traveling down the road. These bearings are often contained within a unitized hub, which requires replacement, should the bearings found within begin to wear.

Alternatively, many older vehicles featured independent wheel bearings, which could be removed and packed with grease whenever necessary. Unfortunately, no matter the type, wheel bearings do tend to wear out with time.

In the vast majority of cases, a badly worn wheel bearing will make a roaring noise, as a driver travels down the road. This noise typically changes in pitch as a vehicle accelerates. At a high rate of speed, this sound is often reminiscent of a whirring or whining noise.

One can often pinpoint a faulty wheel bearing when cornering. If the sound in question changes pitch or ceases entirely in the middle of a turn, a vehicle’s wheel bearings become suspect.

Severity

Excessively worn, or damaged wheel bearings should be replaced as soon as possible. A failure to do so will only lead to increased wear, further exacerbating the issue at hand.

Upon reaching a point of total failure, the rollers found within a wheel bearing’s cage can unseat and dislodge, creating a dangerous amount of free-play within a vehicle’s hub.

In the most extreme of cases, an exceedingly worn wheel bearing can cause a hub to rest free upon its spindle. This presents a dangerous situation, which can ultimately cause a wreck or severely damaged wheel-end components.

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Josh BoydJosh has worked as a full-time mechanic for over 12 years, with 6 ASE (Automotive Service Excellence) certifications under his belt. He began his career as an automotive technician at local Toyota dealership and has since transitioned to specializing in diesel trucks and equipment. Latest posts by Josh Boyd (see all)

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