Related to Wheels/Tires:
* Worn-out wheel bearings: This is a common cause. The sound often increases with speed and might change pitch depending on how hard you turn.
* Unbalanced tires: This usually causes a vibration more than a pure buzz, but it can have a buzzing component, particularly at higher speeds.
* Worn tires: Severely worn tires can sometimes produce a buzzing or humming sound, especially on rough roads.
* Something caught in the tire: A stone or other debris lodged in the tread can create a buzzing or scraping noise.
Related to Brakes:
* Worn brake pads: While often a squealing sound, severely worn pads can sometimes make a buzzing noise.
* Brake rotor damage: Grooved or warped rotors can cause a buzzing or grinding sound, often more pronounced when braking.
Related to Drivetrain:
* Transmission problems: A buzzing sound could indicate issues within the transmission, particularly if it's linked to a specific gear or speed.
* Driveshaft issues: A damaged or worn driveshaft can also cause a buzzing or humming sound, often noticeable at higher speeds.
* Differential problems: Problems within the differential can create a whining or buzzing noise, potentially changing with speed or turning.
Other Possibilities:
* Loose parts: Something loose under the car, like a heat shield or exhaust component, can vibrate and create a buzzing sound.
* Belt problems: Although belts usually squeal, a worn or loose belt might produce a buzzing sound.
To help diagnose the problem:
* Note the speed: Does the sound change with speed? Higher speeds often point to wheel bearings, tires, or drivetrain issues.
* Note the conditions: Does the sound change when turning, braking, or accelerating?
* Listen carefully: Is it a constant buzz, or does it vary in intensity or pitch?
* Check visually: If you're comfortable doing so, inspect your tires, wheels, and brakes for any obvious signs of damage or wear.
If you're unsure of the cause, it's best to take your car to a mechanic for diagnosis and repair. Ignoring a buzzing sound can lead to more serious and expensive problems down the line.
