Mechanical problems
* Wear of gears and bearings
*Damage to gearbox housing
* Torque converter malfunction
* Problems with the gear shift mechanism
Hydraulic faults
*Low oil pressure
*Oil contamination
* Oil pump malfunction
* Damage to hydraulic valves
Electrical faults
* Malfunction of input and output shaft speed sensors
* Faulty gear shift solenoids
* Malfunction of the electronic control unit (ECU)
Symptoms of malfunctions
* Slipping or jamming of the gearbox
* Noise, vibration or hum when driving
* Difficulty shifting gears
*Oil leaks
*Check Engine light flashing or on
Possible reasons
* Late maintenance and oil change
* Transmission overheating
* Aggressive driving style
* Vehicle overload
* Defective components
Diagnostic methods
* Checking the oil level and condition
* Diagnose errors using a scanner
* Visual inspection of the gearbox and torque converter
*Checking oil pressure
Repair options
* Repair of faulty components
* Replacement of individual parts (e.g. gears, bearings)
* Gearbox overhaul
* Replacing the gearbox with a new or rebuilt one
Prevention recommendations
* Regular oil and filter changes
* Compliance with vehicle maintenance recommendations
* Avoiding aggressive driving style
* Do not overload the car
* Use original or high quality spare parts