Mechanical problems
* Wear of friction discs and bands
* Clogged hydraulic channels
* Oil pump wear
*Damage to planetary gear
* Wear of bearings and gears
Electrical faults
* Faulty gear selector position sensor
* Damage to wiring
* Malfunction of the automatic transmission control unit
* Malfunction of solenoids
Hydraulic faults
*Low transmission fluid level
* Clogged or leaking automatic transmission fluid
* Worn or damaged oil seals
*Hydraulic accumulator malfunction
Software problems
* Errors in automatic transmission software
* Incorrect calibration
Other faults
* Torque converter clutch slipping
* Automatic transmission overheating
* Vibration and noise
* Failure to engage gear or transition to emergency mode
* Incorrect gear shifting