Signs of a buzzing automatic transmission:
In neutral (P, N):
* Constant humming or buzzing noise regardless of engine speed.
When shifting gears (D, R):
* The humming noise gets louder when shifting into any gear.
*Slipping or jerking when changing gears may be accompanied by a humming noise.
When driving:
* The hum gets louder as the speed increases.
* The hum changes tone or intensity when changing gears or turning.
* Humming may be accompanied by vibration.
Additional signs:
* Increased automatic transmission fluid level or leakage.
* Burning or metallic smell coming from the transmission.
* Difficulty shifting gears.
* Increased fuel consumption.
Possible causes of humming:
* Bearing wear
*Lack of transmission fluid
* Oil filter clogged
* Wear on gears or other internal components
* Problems with the oil pump
* Damage to the torque converter