Possible reasons that the automatic transmission starts to kick when heated:
Transmission fluid (ATF) problems:
*Low ATF level
* ATF contaminated or burnt
*Wrong ATF type
Problems with torque converter:
* Torque converter slippage
* Clogged torque converter filter
* Worn or damaged intermediate shaft bushing
Problems with control valves:
* Clogged or faulty transmission control valves
*Low oil pressure
*Faulty Transmission Control Module (TCM)
Problems with mechanical parts:
* Worn or damaged gear teeth
* Friction disc slippage
* Loose or damaged fasteners
Other possible reasons:
* Faulty speed sensor
*Faulty throttle position sensor
* Electrical wiring problems
How to solve the problem:
1. Check the level and condition of the transmission fluid. Replace ATF and filter if necessary.
2. Diagnose the torque converter. It may need replacement or repair.
3. Check control valves. Clean or replace them as necessary.
4. Check the mechanical components of the transmission. Replace worn or damaged parts.
5. Scan the system for trouble codes. This may help determine the specific cause of the problem.
Important: Do not ignore the transmission kicking when it heats up, as this can cause serious damage and costly repairs. Have it diagnosed and repaired by a qualified mechanic as soon as possible.