Causes of jerks in the operation of the Kia Ceed automatic transmission:
Speed sensor problems:
* A faulty speed sensor may send incorrect signals to the transmission’s electronic control unit (ECU), causing the transmission to shift incorrectly.
Contaminated or worn transmission solenoids:
* Solenoids control the flow of fluid in the transmission. Dirty or worn solenoids can affect fluid pressure and cause jerking.
Problems with torque converter:
* The torque converter ensures a smooth connection between the engine and transmission. A faulty torque converter can cause vibration and jerking.
Low transmission fluid level:
*Low transmission fluid levels can cause insufficient system pressure, resulting in difficulty shifting gears.
Contaminated or old transmission fluid:
* Dirty or old transmission fluid can reduce lubrication and cause shifting problems.
Other possible reasons:
* Faulty ECU
* Electrical wiring problems
* Wear or damage to mechanical components of the transmission
If jerks occur in the operation of the Kia Ceed automatic transmission, it is recommended:
* Check transmission fluid level
* Check the serviceability of speed sensors
* Perform computer diagnostics of the transmission system
* Contact a car service center to have the gearbox inspected by a mechanic