Possible reasons for poor switchability of the automatic transmission selector:
Mechanical problems:
* Worn or damaged shift cable
* Failure of the selector lever mechanism
* Problems with internal automatic transmission components, such as valve body or clutches
Electrical problems:
* Faulty electrical connectors or wiring
* Malfunction of the electronic control unit (ECU) of the automatic transmission
Hydraulic problems:
* Lack or leak of transmission fluid
* Problems with valve body or shift solenoids
Other factors:
* Automatic transmission overheating
* Using the wrong transmission fluid
* Contamination of the transmission fluid system
* Ignition switch malfunction
Diagnostics and troubleshooting:
1. Check the level and condition of the transmission fluid.
2. Inspect the shift cable and selector linkage for damage or wear.
3. Connect the scanner to the automatic transmission ECU to read the fault codes.
4. Check electrical connections and wiring for damage or loose connections.
5. Check the valve body and shift solenoids for malfunctions.
Depending on the diagnostic results, it is necessary to carry out appropriate repairs, for example:
* Replacement of gear shift cable
* Repair of selector lever mechanism
* Replacement of the automatic transmission electronic control unit
* Elimination of transmission fluid leaks
* Flushing the transmission fluid system
If you do not have the appropriate knowledge and experience, it is recommended that you contact a qualified mechanic to diagnose and repair the problem.