Possible reasons for the automatic transmission jerking when shifting in a Hyundai car:
Mechanical problems:
* Worn friction discs or steel plates
* Contaminated or worn transmission oil
*Low transmission fluid level
* Transmission oil filter is clogged
* Worn transmission solenoids
* Torque converter problems
* Gear position sensor malfunction
Electrical problems:
* Damaged wiring or connectors in the transmission control module
* Faulty Transmission Control Unit (TCU)
* TCU software glitch
Other problems:
* Worn engine or transmission mounts
*Dirty air filter
* Problems with the mass air flow sensor
* Clogged catalytic converter
* Incorrect fuel pressure
Troubleshooting:
To accurately diagnose and eliminate automatic transmission jerking, it is recommended to contact a qualified mechanic. Typically the troubleshooting process includes:
* Checking the level and condition of the transmission fluid
* Replacement of transmission fluid and filter
* Scan trouble codes for signs of problems with the TCU or other systems
* Inspect and/or replace mechanical components such as friction discs, solenoids or torque converter
* TCU software update
* Repair or replace electrical components such as wiring or TCU
*Checking other components that may affect transmission performance, such as engine mounts, mass air flow sensor, or catalytic converter