If you notice the symptoms of a bad transmission solenoid, you will not be able to shift gears correctly. While the various engine sensors determine when the gears are supposed to shift, the job of the transmission solenoid is to carry out the actual shifting mechanism. If the transmission solenoid is working correctly and is energized, the mechanical plunger allows the right amount of fluid to pass through, while the transmission solenoid is not receiving power in its closed position. The transmission solenoids and the sensors determine when it is the correct time to shift gears, depending on the vehicle and the engine speed. Transmission solenoids consist of a spring loaded plunger that communicates with the car’s engine sensors or the transmission control module via electronic signals. At this point, the fluid can pressurize the clutches and bands to change gears quickly. The transmission solenoid is the part in charge of opening and closing the valves in the body to allow for either more, or prevent, the fluid from entering. In an automatic transmission car, the transmission relies on various bands and clutches to change gears smoothly and on time, and the only way that this can be done is by the correct amount of fluid pressure within the shifting system. If you start noticing the symptoms of a bad transmission control solenoid, then this can mean serious problems for your transmission and the performance of your engine. In addition, speed sensors located near the engine are responsible for turning on and activating the transmission solenoids.Īs you can see, the transmission solenoid is a key part of the functioning transmission that keeps your car running smoothly. These transmission solenoids are in charge of opening or closing hydraulic valves to regulate the flow of fluid in the system. First, transmission fluid is directed through the valves by various transmission solenoids, like the shift solenoid, lockup solenoid, or the transmission control solenoid.
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