What Is a Transmission Solenoid?

March 26, 2024

What Is a Transmission Solenoid?

transmission solenoid

When it comes to transmissions, there are a lot of complicated moving parts. Each part has its own unique purpose in assuring your transmission continues to function correctly. A transmission solenoid is a critical component in the transmission system. The transmission solenoid is an electro-hydraulic valve that is usually made of steel.


Transmission Solenoid

When it comes to transmissions, it’s important to understand there are several different parts for the transmission to work properly. It only takes one part not working correctly to keep the transmission from transferring power to the engine, to the drivetrain and then the wheel. The malfunctioning part is often the transmission solenoid.


Role of Transmission Solenoids

The flow of the transmission fluid is controlled by the transmission shift solenoid. This electromechanical valve controls the transmission fluid flowing throughout the transmission. In most modern transmissions, the solenoid comes in a pack which is in the valve body of the

transmission, the control module, or the control unit. For your transmission to function effectively, it is essential for the transmission fluid to flow properly.


How do Solenoids Work?

Inside your car’s engine are speed sensors that are constantly monitoring how your car is running and corrections when needed. These sensors are analyzing what needs to be adjusted including knowing when the gears need to change to attain the correct speed and power. Transmission solenoids have a spring-loaded plunger wrapped in wire that receives signals to adjust hydraulic fluid flow within your transmission. Smooth transition between gears as you accelerate is accomplished from pressurization by the solenoids using the necessary bands and clutches.


Symptoms of Malfunction Solenoids

Erratic or delayed gear shifting, car revs when braking, you can’t downshift, transmission is stuck in neutral and check engine light in on. These are just a few symptoms that could point to failing solenoids.


If you suspect you have a failing solenoid, replacing one is complicated. Leave the task to an expert. Eagle Transmission in Mesquite can help regardless of the make and model of the vehicle. Give us a call today at 972-285-4040.

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