Possible causes of strong shocks when switching into an automatic transmission:
Hydraulic problems:
*Low transmission fluid level
* Contaminated or degraded transmission fluid
* Worn or damaged torque converter, pumps or valves
* Dirty or clogged hydraulic unit
Mechanical problems:
* Worn or damaged clutches
* Damaged gears or gears
* Worn or damaged servos
* Defects in the brake band
Electrical problems:
* Malfunction of solenoids
* Wiring problems (breaks, short circuits)
* Faulty engine speed/rpm sensor
Control problems:
*Transmission control module (TCM) malfunction
*Transmission software problems
* Incorrect switching settings
Other reasons:
*Engine malfunction such as misfire
* Cardan shaft failure
* Transmission fluid is too viscous in cold weather
Recommendations to resolve the problem:
1. Check the level and condition of the transmission fluid: Add or replace fluid if necessary.
2. Scan for trouble codes: This will help identify specific problems with the automatic transmission.
3. Physically inspect the automatic transmission: Check for leaks, extraneous noise and mechanical damage.
4. Perform a hydraulic test: Check transmission fluid pressure and flow.
5. Check solenoids: Measure resistance and voltage to determine if they are working properly.
6. Check Sensors: Make sure the engine speed/rpm sensors are working correctly.
7. Update Transmission Software: The TCM software may need to be updated to resolve drivability issues.
8. Overhaul or replace the automatic transmission: If the mechanical or hydraulic damage is severe, the automatic transmission may need to be repaired or replaced.
Note: Diagnosing and eliminating strong shocks when switching in an automatic transmission is a complex task that requires special knowledge and equipment. It is recommended that you contact a qualified mechanic for accurate diagnosis and repair.