Possible reasons for the automatic transmission buzzing in a Toyota Corolla:
1. Low transmission fluid level
* Check the fluid level and add it to the required level.
2. Worn gearbox oil
* Transmission oil wears out over time and loses its lubricity.
* It is recommended to change the gearbox oil in accordance with the manufacturer’s recommendations.
3. Worn bearings
* The bearings in the transmission can wear out over time, resulting in a humming noise.
*This repair requires disassembling the transmission.
4. Faulty torque converter
* The torque converter transmits torque from the engine to the gearbox.
*A faulty torque converter may cause a humming noise.
* Usually the torque converter needs to be replaced.
5. Gear problems
*Worn or damaged gears can also cause a humming noise.
*Repair usually involves replacing gears.
6. Defective solenoids
* Solenoids control the flow of transmission fluid.
*A faulty solenoid can cause shifting problems and a humming noise.
* Usually the solenoid needs to be replaced.
7. Drive problems
*Humming can also be caused by a worn or faulty drive.
* The drive transmits torque from the gearbox to the wheels.
* Drive replacement may be necessary.
Important:
* A noise in the transmission may be a sign of a serious problem.
*If you hear a humming noise, take it to a qualified mechanic for diagnosis and repair.
* Ignoring hum may result in further damage and costly repairs.