Possible reasons:
Mechanical problems:
* Worn or damaged friction discs
* Faulty gear shift solenoids
* Clogged hydraulic system
* Torque converter problems
* Damage to planetary gears
* Loose or damaged transmission mount
Electronics problems:
* Faulty speed sensors
* Damage to wiring harness
* Malfunctions in the transmission control unit software
Fluid problems:
*Low fluid level
* Fluid contamination or wear
* Using the wrong type of fluid
Other reasons:
* Incorrect shift cable adjustment
* Worn engine or transmission mount
* Vacuum level too high or low
* Malfunction of the throttle position sensor
Possible solutions:
* Diagnose and repair or replace damaged mechanical components
* Checking and repairing electronic systems
* Replacement of automatic transmission fluid and filter
*Adjusting the gear shift cable
* Checking and repairing engine and gearbox mounts
* Checking and repairing the vacuum system
* Checking and repairing the throttle position sensor
To accurately determine the cause and correct the problem, it is recommended that you contact a qualified mechanic for diagnosis and repair.