Common reasons:
*Low or contaminated transmission fluid: Low or contaminated transmission fluid results in reduced pressure and lubricity, which can cause slipping and rough shifting.
* Faulty solenoids: The solenoids are responsible for shifting gears. Their malfunction can lead to incorrect shifting and jerking.
* Torque Converter Malfunction: The torque converter acts as a clutch in an automatic transmission. Its malfunction can cause jerking and slipping.
* Friction lining wear: Over time, the friction linings that provide traction can wear out, resulting in jerking and slipping.
* Malfunction of speed sensors: Speed sensors transmit engine and vehicle speed information to the transmission control unit. Their malfunction can lead to incorrect switching.
Specific reasons for different cars:
* Toyota: Locked torque converter, faulty third gear shift solenoid or worn torque converter linings.
*Honda: Contaminated or low transmission fluid, faulty torque converter, or faulty shift solenoid.
* Ford: Shift solenoid malfunction, dirty or low transmission fluid level, or worn friction linings.
* Chevrolet: Valve body failure, friction lining wear, or shift solenoid failure.
Other possible reasons:
* Faulty wiring: Faulty wiring that transmits signals to the transmission can cause shifting problems.
* Software errors: In some cases, errors in the transmission control module software can cause jerking.
*External influences: Heavy loads, such as towing or off-road driving, may increase jerking.