Possible reasons:
* Incorrect oil: Make sure the correct type of transmission fluid is used as recommended by the manufacturer.
* Incorrect oil level: Check the automatic transmission oil level and make sure it is within the recommended range.
* Contaminated Oil: If old oil is not completely removed before new oil is added, contaminants may have entered the system.
*Clogged Filter: A clogged filter can restrict oil flow and cause shifting problems.
* Electronics Failure: Automatic transmission electrical components, such as solenoids, can be faulty and cause shifting problems.
* Worn or damaged parts: Worn clutches, bearings or other internal components can cause shifting noise.
* Torque converter problems: The torque converter transfers power from the engine to the transmission and can cause kicking if it is faulty.
Solution:
1. Check oil level and condition: Make sure the oil level is within the recommended range and that it is clean and not burnt.
2. Replace the transmission filter: If the filter is dirty or clogged, it needs to be replaced.
3. Diagnose electronics problems: Connect the OBD scanner to the car and check for automatic transmission related fault codes.
4. Inspection and repair of internal components: If other causes have been ruled out, it may be necessary to remove and disassemble the automatic transmission to check for worn or damaged components.
5. Torque Converter Repair or Replacement: If the torque converter is faulty, it must be repaired or replaced.
Important: It is strongly recommended that you contact a qualified mechanic to diagnose and repair automatic transmission problems. Trying to fix the problem yourself without proper knowledge may result in further damage to the transmission.