Possible reasons for automatic transmission slipping when changing gears:
1. Low transmission fluid level: Insufficient fluid level can lead to low pressure and slipping.
2. Worn ATF oil: ATF oil loses its properties over time, becoming less viscous and unable to provide sufficient pressure.
3. Clogged Oil Filter: A clogged oil filter can restrict fluid flow, which also results in low pressure.
4. Faulty Speed Sensor: A faulty speed sensor can provide incorrect information about the vehicle’s rotational speed, resulting in incorrect shift points.
5. Faulty Solenoid: Solenoids regulate the flow of fluid into the automatic transmission, and a faulty solenoid can cause the transmission to slip.
6. Slippery clutch: Clutches in automatic transmissions can wear out over time, leading to slipping and slipping gears.
7. Faulty torque converter: The torque converter transfers power from the engine to the automatic transmission, and a malfunction can lead to slipping.
8. Faulty control unit: The electronic control unit (ECU) controls the automatic transmission, and its malfunction can lead to incorrect shifting and slipping.
9. Stretched Drive Chain/Belt: Some automatic transmissions use chains or belts to transmit power, and stretching them can cause slipping.
10. Mechanical Problems: Internal mechanical problems, such as worn gears or bearings, can cause gears to slip.
Note: If you experience slippage when shifting, have it diagnosed and repaired by a qualified mechanic. Ignoring the problem can lead to further damage and more expensive repairs.