Possible reasons:
* Oil problems:
*Low oil level
* Contaminated or old oil
*Damage or wear of internal components:
* Wear of clutches or steel discs
* Malfunction of solenoids
*Pump fault
* Bearing wear
* Electronics problems:
*Transmission control module (TCM) malfunction
* Faulty sensors
* Other problems:
* Torque converter malfunction
* Clogged transmission filter
* Vacuum leak
Diagnostics:
1. Check the oil level and condition: Make sure the oil level is correct and that the oil is not contaminated.
2. Diagnose Trouble Codes: Connect a trouble code scanner to check for codes that may indicate transmission problems.
3. Physical Inspection: Check the transmission for oil leaks or external damage.
4. Test drive: Drive the car, paying attention to the symptoms of floating speed.
5. Pressure check: Measure the transmission pressure to ensure it is within the acceptable range.
Repair:
Repairs will depend on the exact cause of the problem. Possible repair options include:
* Oil and filter change
* Repair or replacement of internal components
* Replacement of solenoids or pump
* TCM reprogramming or replacement
* Repair or replacement of torque converter
* Clean or replace the transmission filter
* Eliminate vacuum leaks
Adviсe:
* Maintain the transmission promptly, following the manufacturer’s recommendations.
* Avoid sudden acceleration and stopping, which can strain the transmission.
*If you experience any transmission problems, contact a qualified mechanic immediately.
* Check the level and condition of the transmission fluid regularly.