Mechanical reasons:
* Wear of clutch clutches
* Breakage or wear of planetary gears
* Clogged hydraulic unit
*Valve body malfunction
* Drive shaft wear
*Transmission fluid leak
Electrical reasons:
* Faulty shift lever position sensor
* Damage to the electronic control unit (ECU) of the automatic transmission
* Open or short circuit in electrical wiring
Reasons related to operation:
* Overheating of the automatic transmission due to slipping or overloads
* Irregular changes of transmission fluid and filters
* Using the wrong type of transmission fluid
* Rough ride with harsh gear changes or fast acceleration
Other reasons:
* Factory defect
*Corrosion due to water or chemicals
*Collision or accident