Possible reasons for the jerk when turning on the automatic transmission:
Mechanical problems:
* Wear of clutches or steel discs
*Damage to oil pump
* Torque converter problems
* Contamination or lack of transmission fluid
Electrical problems:
* Failure of transmission sensors or solenoids
* Malfunction of the electronic control unit (ECU)
Software problems:
* Outdated or damaged ECU software
Other reasons:
* Faulty engine or gearbox mounting
* Worn or damaged motor support bearings
*Brake system malfunction
Diagnostics:
* Check the level and condition of the transmission fluid.
* Scan the transmission control system for trouble codes.
* Check the physical condition of the transmission and its components.
* Test drive with a diagnostic tool connected to monitor transmission performance.
Remedy:
Depending on the cause of the jerk, the following actions may be required:
*Replacement or repair of faulty components
* ECU software update
* Adjustment or repair of fasteners
* Bleeding the brake system
Warning:
* Do not ignore jerking when turning on the automatic transmission, as this may indicate a serious malfunction.
*If you experience jerking, take it to a qualified mechanic for diagnosis and repair.
* Regular maintenance and use of the recommended transmission fluid will help extend the life of the transmission.