Causes of jerking when shifting automatic transmission gears:
Mechanical faults:
* Worn or damaged friction discs
* Clogged oil filter
*Lack of transmission fluid
*Low transmission fluid pressure
*Damaged gears or shafts
* Worn or damaged solenoids
Hydraulic faults:
* Faulty valve body
* Clogged hydraulic channels
* Faulty transmission fluid pressure sensor
* Faulty transmission fluid temperature sensor
Electronic faults:
* Faulty gear selector position sensor
* Faulty input/output shaft speed sensor
*Damaged wiring or connectors
* Faulty automatic transmission control unit
Software problems:
* Outdated or faulty automatic transmission software
* Incorrectly installed software update
Other possible reasons:
* Worn or damaged engine or transmission mounts
* Contaminated or old transmission fluid
* Incorrect transmission fluid level
* Automatic transmission overheating
* Aggressive driving
Troubleshooting:
* Determine the exact cause of the jerking behavior by diagnosing it with a trouble code scanner or checking the transmission fluid.
* Fix mechanical problems such as replacing friction plates or repairing gears.
* Clean or replace hydraulic components such as filter or valve body.
* Check and repair or replace electronic components such as solenoids or sensors.
* Update automatic transmission software if necessary.
* Check and adjust the transmission fluid level.
* Repair or replace worn engine or transmission mounts.
* Drain and replace transmission fluid.
* Avoid aggressive driving.
Note: In some cases, shifting jerkiness can be caused by a combination of factors. It is important to conduct a thorough diagnosis to determine the exact cause and make appropriate repairs.