Mechanical reasons:
* Wear of friction linings
* Damage to gear teeth
* Seized or broken bearings
* Torque converter failure
* Damage to the automatic transmission housing or cover
Hydraulic reasons:
* Reduced pressure in the torque converter system
* Malfunction of solenoids and valves
* Clogged or leaking hydraulic fluid
* Failure of the torque converter pump
Electrical reasons:
* Damage to speed and position sensors
* Malfunction of automatic transmission control module
* Breaks or short circuits in electrical wiring
Other reasons:
* Insufficient transmission fluid level
* Using low-quality liquid
* Automatic transmission overheating
* Aggressive vehicle operation
Long-term factors contributing to automatic transmission failure:
* Regular towing of heavy loads
* Driving at high speeds for long periods of time
* Late maintenance and replacement of transmission fluid
* Ignoring alarms about problems