Possible reasons:
1. Low transmission fluid level
* Check the fluid level and add if necessary.
2. Dirty transmission fluid
* It is recommended to change the transmission fluid according to your maintenance schedule.
3. Faulty transmission control valve
* The valve’s job is to regulate the flow of fluid in the gearbox. Its malfunction can lead to abrupt switching.
4. Worn friction discs
* Friction discs engage and separate when changing gears. Their wear can lead to slippage and impact.
5. Faulty torque converter
* The torque converter transfers power from the engine to the transmission. Its malfunction may cause shock when switching.
6. Worn bushings
* Bushings support transmission shafts. Their wear can lead to play and shock when switching.
7. Faulty speed sensor
* The speed sensor tells the computer about the speed of rotation of the transmission shaft. Its malfunction can cause incorrect shifting and shock.
8. Problems with electrical wiring
* A fault in the wiring may interfere with the operation of the transmission control system.
Troubleshooting steps:
* Check the level and condition of the transmission fluid.
* Change the transmission fluid if it is contaminated.
* Have your transmission inspected by an auto repair shop to identify a faulty valve, friction discs, or torque converter.
* Replace worn bushings or speed sensor.
* Check and correct electrical wiring faults.
Note: Ignoring shift shocks may result in further damage to the transmission. It is recommended that you contact a car repair shop as soon as possible to have the problem resolved.