Possible causes of kicking in a Toyota automatic transmission:
Mechanical problems:
* Wear of clutches and steel discs
* Torque converter malfunction
* Malfunction of planetary gearbox
* Transmission fluid leaks
Electrical problems:
* Malfunction of solenoids
* Malfunction of sensors (speed, pressure, temperature)
* Malfunction of the electronic control unit (ECU)
Software problems:
* Outdated or damaged ECU firmware
Transmission fluid problems:
*Low fluid level
* Contaminated liquid
* Wrong fluid type
Other reasons:
* Malfunction of the torque converter lock-up clutch
* Wear of gearbox bearings
* Transmission mounting problems
*Wiring harness fault
Additional factors contributing to automatic transmission kicking:
* Aggressive riding
* Towing heavy loads
* Incorrect gear shifting
* Using the wrong type of transmission fluid