What's the reason for the transmission not shifting up?

[IvanLee]

The possible causes for the failure to shift up: improper adjustment of the throttle cable or throttle position sensor; malfunction of the governor; severe leakage in the governor oil circuit; faulty speed sensor. Below is the relevant introduction: 1. Automatic transmission: As the name suggests, an automatic transmission does not require the driver to manually shift gears. The vehicle will automatically select the appropriate gear based on the driving speed and traffic conditions. Generally, automatic transmission vehicles have six gear positions, arranged from top to bottom as: P, R, N, D, S, L. 2. Transmission: A device that changes the speed ratio and direction of motion. Used in automobiles, tractors, ships, machine tools, and various machines to alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. Gear-driven transmissions generally consist of a housing and several pairs of gears.