![]() ![]() If you do receive an OBD code, you can bring your transmission to a certified mechanic to have it diagnosed and fixed. If the check engine light doesn’t appear but you are experiencing shifting problems, the problem with the solenoid is most likely a mechanical issue which replacement of the part should solve. Common Transmission Solenoid ProblemsĪn electrical malfunction will cause the solenoid to act erratically and when the check engine light comes on, a quick scan of the car’s computer should tell you what’s wrong. So while the various engine sensors determine when the gears should shift, it is the job of the transmission solenoid to act out the actual shifting. If the transmission solenoid is energized, the plunger opens and allows fluid to pass while a solenoid that is not receiving power is closed in its normal position. Sensors determine when it’s time to shift gears depending on vehicle and engine speed. Solenoids consist of a spring loaded plunger wrapped with a coil of wire, and communicates with the car’s engine sensors or the transmission control module (TCM) via electronic signals to either open or close. The transmission solenoid is responsible for opening or closing valves in the valve body to allow transmission fluid to enter, at which point the fluid can do its thing and pressurize the clutches and bands. The automatic transmission relies on bands and clutches to change gears, and the only way they can be applied is by fluid pressure. So today we’ll explain its function, common problems that can occur, and everything you need to know about replacement here. Speed sensors around the engine are responsible for activating the solenoids.Īs you can guess, the transmission solenoid is a required component of a functioning transmission, and any solenoid that starts malfunctioning only spells trouble. Transmission fluid is directed throughout the valve body by various transmission solenoids– such as the transmission shift solenoid, lockup solenoid, or transmission control solenoid (there’s also a torque converter clutch solenoid)–that either open or close hydraulic valves to regulate fluid flow. While manual transmissions make use of the clutch to change gears, automatic transmissions rely on a complicated hydraulic system for shifting, and the transmission solenoid is especially important for this process. ![]()
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