Possible reasons:
* Dirty or old transmission fluid: Insufficient or contaminated transmission fluid can cause insufficient pressure and clutch slipping.
* Incorrectly adjusted shift cable: If the shift cable is not adjusted properly, it can cause slow shifting, jerking or slipping of the gears.
*Faulty Solenoid: The solenoid that controls transmission fluid flow may fail, causing rough shifting and jerking.
* Faulty torque converter: The torque converter that connects the engine to the transmission can fail and cause the gears to jerk and slip.
* Worn Clutches: The clutches in the transmission can wear out over time, causing slipping and jerking when shifting.
* Faulty Transmission Control Unit (TCU): The TCU is responsible for controlling the transmission and a malfunction can lead to various problems including jerking.
Recommended actions:
* Check and replace transmission fluid if necessary: Check the level and condition of the transmission fluid and replace it if it is dark, dirty or has a burning smell. Use the type of fluid recommended by the manufacturer.
*Adjust Shift Cable: Adjust the shift cable to manufacturer specifications to ensure proper shifting.
* Test Solenoids: Test the solenoids to determine if they are operating properly. Replace faulty solenoids as necessary.
* Check torque converter: Check the torque converter for signs of leaks or damage. If necessary, replace the faulty torque converter.
* Check and replace clutches if necessary: If clutches are worn, they must be replaced to ensure smooth gear shifting.
* Scan for Trouble Codes: Connect an OBDII scanner to the vehicle to check for transmission-related trouble codes. This can help diagnose a faulty TCU or other electrical problems.
If these steps do not resolve the problem, it is recommended that you contact a qualified mechanic for further diagnosis and repair.