what does a solenoid do for an automatic transmission.Also if it goes out what are the reactions with your transmission. How does your vehicle run or run like.
The automatic transmission uses one or more planetary gear systems. By holding different portions from moving, the output gear ratio is varied. So there are a number of hydraulic clutches and brake bands that can cause different portions of the planetary gear system to lock up. And the solenoids are electronically controlled valves that let or prevent the hydraulic pressure from a pump, to get to these clutches and brake bands. In general, when the solenoids go bad completely, some gears become inoperative. When they leak or weaken, they allow fluid pressures to be less than optimum, so the clutches or brake bands slip, and burn up.
A transmission solenoid is an electro-hydraulic valve that controls fluid flow into and throughout an automatic transmission. Solenoids can be normally open or normally closed. They operate via a voltage or current supplied via the transmission computer or controller. Transmission solenoids are usually installed in a transmission valve body, Transmission Control Unit, or transmission control module.
