If the car is straight drive check the transmission fluid for full. Check the u joints on a rear wheel drive. Look for any loose parts on the exhaust system as well to try and find the humming problem.
Electric fuel pump
Possibly worn wheel bearings can create a humming or groaning sound.
Generally, after you drive your Honda Accord and turn it off, the cooling fan will activate. This may be the sound you are hearing. It is just the car's way of cooling off faster.
A bearing going bad.
The humming sound is the fuel pump. this is normal the sound is the air compressor for the ELC (Electroinc level control) it pumps air into the rear struts the level the car out when you turn on the key.
bad wheel bearings
The question you are asking is the same as a question like: Is building a house? or Is driving a car? You can built a house, you can drive a car and you can surely sing or hum a melody! Is singing or humming a melody, the act itself is not! But depending on what you are humming or what you are singing, the part that comes out of your mouth can be a melody...
No, but a bad wheel bearing could.
The motor which blows air through the vents.
Check the drive axle for a broken and leaking boot or bad CV joint.
MAKE CAR MAKES THE SAME NOISE AND REPLACING THE PVC VALVE FIXED THE PROBLEM