Mechanical problems
* Broken splines on gears
* Worn bearings
* Damaged friction discs
* Damaged planetary gears
* Damaged fluid coupling
Electrical faults
* Faulty control unit
* Faulty shift solenoids
* Faulty speed sensors
* Faulty temperature sensors
* Broken or damaged wiring
Hydraulic faults
* Transmission fluid clogged or leaking
* Worn or damaged oil pump
* Faulty torque converter
* Sticking or leaking hydraulic valves
Other faults
*Transmission slipping
* Difficulty shifting gears
* Vibration or noise while driving
* Burning or smoke smell from transmission
* Transmission overheating
*No reverse gear
* The car does not move despite being in gear