Possible reasons:
*Low automatic transmission fluid level: Check the level and add the correct transmission fluid if necessary.
* Contaminated transmission fluid: Over time, wear debris can accumulate in the fluid. Replace it and the automatic transmission filter.
* Faulty Solenoid: The solenoids control fluid pressure and gear shifting. Their malfunction can cause shocks and slipping.
* Worn friction discs: When the friction discs wear out, the grip between them becomes weaker, which leads to slipping and jolting.
* Faulty torque converter: The torque converter transmits torque from the engine to the automatic transmission. Its malfunction can cause vibration and slipping.
* Bearing wear: Worn bearings can create noise and vibration and make shifting difficult.
* Wiring faults: Faulty wires or connectors can interfere with the operation of solenoids and other automatic transmission components.
* Software problems: In modern cars, the automatic transmission is controlled by software and electronic components. Software faults can cause jolts and other problems.
What to do:
1. Check the level and condition of the transmission fluid.
2. Replace transmission fluid and filter.
3. Take the vehicle to a qualified mechanic for inspection.
4. If necessary, repair or replace faulty components.
5. Update the automatic transmission software, if available.