What is the reason for not being able to shift gears?

[Josephine]

The reasons for not being able to shift gears: internal failure of the gear lever assembly; failure of the P-gear lock solenoid valve inside the gear lever, or failure of the brake switch. Here is some additional information: 1. Gear shifting: Gear shifting refers to the transmission, which is used to change the torque and speed of the engine crankshaft to meet the different requirements of traction force and speed for driving wheels under various driving conditions such as starting, accelerating, driving, and overcoming road obstacles. 2. Function: Gear shifting allows the car to drive at a very low and stable speed, which is difficult to achieve solely by the minimum stable speed of the internal combustion engine. The reverse gear of the transmission enables the car to move backward, and its neutral gear allows the engine to be separated from the transmission system for a long time when starting the engine, parking, or coasting.