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In modern automatic transmission, pressurized hydraulic fluid is used to change gears. Whenever a gear is changed, a transmission solenoid sends transmission fluid to the valve body so that the correct gear will be engaged. The downshift solenoid regulates the transition from a higher gear to a lower gear. It is an electronically-controlled mechanical component that allows fluid movement to engage the correct lower gear. If the downshift solenoid is not working, you can experience erratic shifts or a lack of transmission downshifting altogether.
There is no set interval for replacement of a shift solenoid, though the transmission fluid should be replaced per your manufacturer’s recommended interval. Because of the complexity involved in diagnosing a shifting problem, have one of our expert mechanics diagnose it.
Erratic shifting can be difficult to anticipate and control when you are driving, and can put you in a potentially difficult driving situation. It should be diagnosed immediately.