Possible reasons:
Mechanical:
* Wear of clutches and steel discs
* Damage to valve body
*Transmission fluid leak
* Clogged oil filter
* Torque converter slippage
* Faulty solenoid
Electrical:
* Faulty gear selector position sensor
*Speed sensor malfunction
* Malfunction of torque converter lock-up solenoid
* Broken or short circuited electrical wiring
Computer:
*Transmission control module (TCM) malfunction
*TCM software glitch
Diagnostics:
*Checking the transmission fluid level: Make sure the fluid level is correct and that it is not contaminated.
* Read Trouble Codes: Connect a diagnostic scanner to the OBD-II port to check for stored trouble codes that indicate transmission problems.
* Physical Inspection: Inspect the transmission for leaks, damage or deformation.
*Test Drive: Take a test drive at different speeds and driving conditions to determine when and under what conditions jerking occurs.
Possible solutions:
* Replacement of worn parts: If necessary, replace clutches, steel discs, etc.
* Repair or replace the valve body: Repair or replace the valve body if it is damaged.
*Transmission Fluid Leak Repair: Replace the seals or hoses that are leaking.
* Oil Filter Replacement: Replace the oil filter to remove contaminants from the transmission fluid.
* Reset Transmission Adaptations: Use a diagnostic scanner to reset transmission adaptations to recalibrate transmission performance.
* TCM Software Update: Update the TCM software if necessary.
* Replacement of faulty electronic components: Replace faulty sensors, solenoids or other electronic components.
It is important to have a qualified mechanic diagnose and repair a jerking automatic transmission, as this can lead to further damage and costly repairs.