• Rear wheel bearings: Excessive wear on the rear wheel bearings can cause a humming noise. The humming sound may increase as the vehicle accelerates and decrease as the vehicle decelerates.
• Axle, Prop Shaft or Driveshaft Failure: If the axle, prop shaft or driveshaft is damaged or worn out, it can cause a humming noise. This noise is usually louder at higher speeds and may go away when the gas is let off.
• Incorrect Tyre Size: If the tyres on the rear of the car are not the correct size, this can lead to a humming noise as the tyres make contact with the road.
• Loose wheel bolts: Loose wheel bolts can cause a humming noise as the wheel wobbles. The humming sound may change as the vehicle turns or accelerates.
• Exhaust system: A leak in the exhaust system can cause a humming noise that may be particularly noticeable at low speeds. The humming sound may change as the vehicle accelerates and decelerates.
• Transmission: A problem with the transmission, such as a worn-out bearing, can cause a humming noise. The humming sound may be more noticeable at certain speeds or under certain driving conditions.
• Differential problem: A humming sound from the rear of the car could also be a sign of a differential problem, such as damaged or worn gears or bearings.
It's important to have a qualified mechanic inspect the vehicle to determine the source of the humming noise and perform any necessary repairs. Driving with a humming noise can result in more extensive and expensive repairs in the future.
