2. Tires: Uneven tire wear, such as cupping or scalloping, can also cause a humming noise. This noise is typically heard at certain speeds and may be accompanied by a vibration in the steering wheel.
3. Differential gears: Worn or damaged differential gears can cause a humming or whining noise that is most noticeable at higher speeds. This noise is typically heard from the rear of the vehicle.
4. Transmission: A humming noise from the transmission is usually caused by a worn or damaged input shaft bearing or a low fluid level. This noise is typically heard when the vehicle is in gear and accelerating.
5. Engine: A humming noise from the engine is usually caused by a worn or damaged timing chain or belt, or a loose engine mount. This noise is typically heard at idle or low speeds.
6. Driveshaft: A humming noise from the driveshaft is usually caused by a worn or damaged universal joint or a loose driveshaft mount. This noise is typically heard when the vehicle is accelerating or decelerating.
7. Exhaust system: A humming noise from the exhaust system is usually caused by a loose or damaged exhaust pipe or muffler. This noise is typically heard when the vehicle is accelerating or decelerating.
