Possible causes of automatic transmission vibration when starting to move:
Mechanical problems:
* Worn or deformed transmission mounts
* Wear of friction discs or steel plates
*Hydraulic transformer failure
*Transmission fluid leak
*Low transmission fluid level
* Contaminated or degraded transmission fluid
Electrical problems:
* Faulty output speed sensor
* Faulty shift solenoid
* Problems with the wiring or electronic control unit (ECU) of the automatic transmission
Other problems:
* Unbalanced or damaged driveshafts
* Broken CV joints
* Faulty differential
Steps to identify and resolve the problem:
1. Check the level and condition of the transmission fluid: Make sure that the fluid level is within the acceptable range and that the fluid does not have a burning smell or is not cloudy.
2. Check the transmission mounts: Inspect the mounts for signs of wear, tears, or deformation.
3. Run a trouble code diagnostic: Using an OBD-II scanner, read trouble codes that may indicate problems with the automatic transmission or sensors.
4. Check Friction Discs and Steel Plates: If the transmission is severely worn or overheated, internal repair work may be required.
5. Check for proper gear shifting: Make sure the transmission shifts smoothly through all gears.
6. Check Speed Sensors: Check the input and output speed sensors for damage or contamination.
7. Check Shift Solenoids: Test the solenoids with a scanner or oscilloscope for proper operation.
8. Check the wiring and transmission ECU: Inspect the wiring and ECU for signs of damage or corrosion.
If vibration continues after following these steps, it is recommended that you contact a qualified transmission repair technician for further diagnosis and repair.