1. Power Steering Pump: If the power steering pump is low on fluid or has a faulty bearing, it can cause a humming noise. Check the power steering fluid level and condition and listen for any unusual noises coming from the pump.
2. Transmission: A faulty transmission mount, worn-out transmission fluid, or a damaged torque converter can also cause a humming noise. Check the transmission fluid level and condition and look for any leaks or damage to the transmission mount or torque converter.
3. Wheel Bearings: Worn-out wheel bearings can also cause a humming noise. Check for any play or roughness in the wheel bearings by lifting the vehicle and spinning the wheels.
4. CV Joints: A worn-out CV joint can also cause a humming noise. Check the CV boots for any tears or damage and look for any play in the CV joints.
5. Differential: A damaged or worn-out differential can also cause a humming noise. Check the differential fluid level and condition and listen for any unusual noises coming from the differential.
If you are unable to identify the source of the noise yourself, it is best to have the vehicle inspected by a qualified mechanic.
