The solenoid receives electronic signals from sensors placed at various points on the engine. These signals, generated from vehicle and engine speed, cause the solenoid to open and close hydraulic valves inside the transmission to shift the gears.

The solenoid receives electronic signals from sensors placed at various points on the engine. These signals, generated from vehicle and engine speed, cause the solenoid to open and close hydraulic valves inside the transmission to shift the gears.