Possible causes of jerking when changing gears in an automatic transmission:
Mechanical problems:
* Wear of clutch friction discs
* Torque converter malfunction
* Clogged or leaking hydraulic fluid
* Faulty gear shift solenoids
* Damage to gears or shafts
Electrical problems:
* Open or short circuit in wiring
* Faulty speed or throttle position sensor
*Transmission control module (TCM) malfunction
Software problems:
* Incorrect TCM calibration
* Problems with TCM software
Other reasons:
*Low or dirty transmission fluid
* Worn or damaged engine or transmission mounts
* Faulty spark plugs or fuel injectors
Diagnostics:
To accurately diagnose the cause of twitching, you must perform the following steps:
* Read trouble codes from TCM using OBD-II scanner
* Check the level and condition of the transmission fluid
* Inspect wiring and connectors
* Check the functionality of the speed and throttle position sensors
* Test the torque converter
Repair:
Depending on the specific cause of the jerking, repairs may include:
* Replacement of worn components such as friction discs or solenoids
* Cleaning or replacing the hydraulic filter
* Replacement of damaged electrical components
* TCM recalibration or replacement
* Elimination of transmission fluid leaks
* Replacement of faulty spark plugs or fuel injectors
Prevention:
To prevent jerking when changing gears in an automatic transmission, it is recommended to perform the following actions:
*Change transmission fluid and filter regularly
* Check the condition of the engine and transmission mounts
* Monitor the serviceability of electrical components
* Avoid sudden starts and stops
* Do not overload the car
*Consult a qualified mechanic if you experience any problems with the automatic transmission.