Mechanical reasons:
* Loose or broken bearing: This supports the input shaft and failure can result in excessive play and failure.
* Warped or broken pump or turbine blades: This causes vibration and heat, which ultimately leads to failure.
* Damage to the overrunning clutch: This clutch provides a one-way connection and failure can result in slipping and loss of power.
* Damage to the Fluid Clutch: This clutch provides locking and failure can result in slippage and loss of efficiency.
Hydraulic reasons:
*Lack or contaminated transmission fluid: This results in insufficient lubrication and cooling, causing wear and failure.
* Clogged hydraulic passages: This restricts fluid flow, resulting in reduced pressure and efficiency.
* Faulty shift valves: These valves control fluid flow and failure can result in incorrect gear shifting.
Electrical reasons:
* Malfunctioning sensors: These sensors provide information about engine speed and vehicle speed, and their failure can cause the torque converter to not operate properly.
* Faulty Solenoids: These solenoids control the shift valves and failure can cause the torque converter to not operate properly.
Other reasons:
*Excessive towing or loading: This may place excessive stress on the torque converter, causing it to fail.
*Poor Maintenance: Regular transmission fluid maintenance and changes are vital to maintaining torque converter health.