Possible causes of jerking when switching automatic transmission in a Ford Kuga:
1. Problems with friction discs:
* Worn or dirty friction discs inside the gearbox
*Loss of adhesion between discs
2. Hydraulic unit malfunction:
* Contaminated or damaged transmission oil
* Solenoid valves are faulty or dirty
* Clogged hydraulic channels
3. Electronic control problems:
* Faulty input shaft speed sensor
* Faulty output shaft speed sensor
* Problems with wiring or automatic transmission control unit
4. Torque converter malfunction:
* Worn or damaged torque converter
*Slipping due to low oil pressure
5. Damage to mechanical components:
* Worn or damaged gears
* Deformed or damaged shaft
6. Low transmission fluid level:
*Transmission fluid leak
* Insufficient fluid to ensure smooth gear shifting
7. Worn or damaged engine or transmission mount:
* May cause vibrations and jerking when shifting
Diagnosis and troubleshooting:
* Check the transmission fluid level and condition.
* Scan trouble codes using a diagnostic scanner.
* Check the condition of the friction discs and other mechanical components of the transmission.
* Check the hydraulic unit for dirt or damage.
* Check the electronic transmission control for wiring or software problems.
* Repair or replace any faulty parts.
* Reset the automatic transmission adaptation values after repair.