Mechanical faults:
*Low transmission fluid level
* Slipping or wear of friction discs
* Faulty torque converter
* Damage to gears or bearings
* Engine torque too high
Electrical faults:
* Faulty Transmission Control Module (TCM)
* Broken wires or loose contacts
* Damage to transmission speed sensors
Software faults:
* Outdated TCM software
* Glitches in electronic control
Other reasons:
* Incorrect maintenance (for example, late replacement of transmission fluid)
*Excessive loads (such as towing heavy loads)
* Wear due to age or mileage of the vehicle
*External damage such as impacts or collisions