Mechanical faults:
* Wear of clutches, steel discs or band brakes
*Hydraulic pump or solenoids problems
* Planetary gear malfunction
* Transmission fluid leaks
* Damaged or clogged oil filter
Electrical faults:
* Malfunction of the electronic control unit (ECU) of the automatic transmission
* Faulty speed or position sensors
*Wiring problems
Software errors:
* Errors in the automatic transmission ECU software
Operating factors:
* Extreme driving or towing heavy loads
* Insufficient transmission fluid level
* Using the wrong transmission fluid
* Failure to perform timely maintenance
*Excessive idling or traffic jams
Other reasons:
* Damage to the automatic transmission housing
* Automatic transmission overheating
* Clogging of transmission fluid with wear products