Possible reasons:
*Low automatic transmission fluid level: Check the level and add fluid to the correct level.
* Contaminated or old automatic transmission fluid: Too old or contaminated fluid loses its lubricating and cooling properties, which leads to increased friction and kicking.
* Faulty solenoids: Solenoids control gear shifting and their malfunction can lead to improper operation of the automatic transmission.
* Sensor Problems: Automatic transmission sensors provide information to the transmission control module, and a faulty sensor can result in incorrect gear shifts.
* Malfunction of the hydraulic control unit: The hydraulic control unit regulates the fluid pressure in the automatic transmission, and its malfunction can cause kicking.
* Worn Friction Discs and Steel Plates: Worn friction discs and steel plates can cause slipping and kicking when shifting.
*Wiring problems: Faulty wiring can cause the automatic transmission to malfunction.
* Faulty Transmission Control Module (TCM): The TCM is the brains of the automatic transmission and a malfunction can cause a variety of problems, including kicking.
Diagnostics and repair:
1. Check the fluid level in the automatic transmission: Measure the fluid level on a warm transmission by turning the selector in all positions and returning to the ‘parking’ position.
2. Replace the automatic transmission fluid: If the fluid is old or dirty, replace it along with the filter.
3. Check wiring: Make sure all wiring harnesses are securely connected and undamaged.
4. Scan for trouble codes: Use the OBDII scanner to scan for trouble codes related to the automatic transmission.
5. Check the solenoids: Remove the solenoids and check for dirt or damage.
6. Check the sensors: Make sure that all automatic transmission sensors are securely attached and operating correctly.
7. Rebuild the hydraulic control unit: In some cases, the hydraulic control unit can be rebuilt by an experienced technician.
8. Replace worn parts: If the friction discs or steel plates are worn, they need to be replaced.
9. Replace TCM: If diagnostics indicate a faulty TCM, it must be replaced by a qualified mechanic.