Possible causes of jerking when shifting gears in a Kia Sportage automatic transmission:
Transmission fluid level and condition:
* Insufficient fluid levels can cause slipping and jerking when shifting gears.
* Contaminated fluid can also interfere with the operation of the automatic transmission.
Solenoid malfunction:
* Solenoids control the flow of fluid into the automatic transmission. A faulty solenoid can result in improper pressure delivery and jerky gear changes.
Problems with torque converter:
* The torque converter transmits engine power to the automatic transmission. If it is faulty, slipping and jerking may occur.
Malfunction of the automatic transmission control unit (TCU):
* TCU is an electronic unit that controls the operation of the automatic transmission. A faulty TCU can cause the transmission to shift incorrectly.
Worn or dirty friction discs and steel plates:
* These components transmit torque between the automatic transmission gears. Their wear or contamination can cause slipping and jerking.
Problems with gear ratios:
* Incorrect gear ratios may result in jerky gear changes.
Diagnostic steps:
1. Check the level and condition of the transmission fluid.
2. Scan the car for automatic transmission fault codes.
3. Check the solenoids, torque converter and automatic transmission control unit.
4. Check the friction discs and steel plates for wear or contamination.
5. Check the automatic transmission gear ratios.
Note: Automatic transmission diagnostics and repairs must be performed by a qualified mechanic with the necessary equipment.