Possible reasons:
Mechanical problems:
* Wear of friction discs
* Piston slippage
* Torque converter malfunction
* Failure of solenoid valves
Control problems:
* Malfunction of the automatic transmission control unit
* Damage to wiring or sensors
*Low or contaminated transmission fluid
Other reasons:
* Wear of engine or transmission mounts
* Incorrect engine settings
* Clogged air filter
Diagnostics:
1. Check the level and condition of the transmission fluid.
2. Connect the fault code scanner. This may reveal problems with electronic components.
3. Take it for a test drive with a mechanic. It can evaluate the performance of the transmission and identify any anomalies.
4. Disassemble and inspect the automatic transmission. This may be necessary to identify internal mechanical problems.
Repair:
Repairs will depend on the specific cause of the problem. Common repair options include:
* Replacement of worn parts
*Adjust control parameters
* Replacement of transmission fluid and filter
* Repair or replacement of automatic transmission control unit
* Installing new engine or transmission mounts
Prevention:
To prevent further problems with automatic transmission, it is important:
* Perform regular maintenance, including changing transmission fluid and filter.
* Avoid sudden acceleration and braking.
* Replace engine and transmission mounts as necessary.
*Use only high quality transmission fluid recommended by the manufacturer.
*Consult your mechanic at the first sign of shifting problems.