What are Transmission Solenoids?

Eagle Transmission Repair Shop • March 10, 2021

What are Solenoids in a tranmission?

Solenoids play an important role in automatic transmissions. Manual transmissions control the gears manually, so most manual transmissions do not have solenoids. Solenoids enable gear changes through electro-hydraulic valves. Depending on the build of the car, the solenoids will control one or more gears. When a solenoid opens or closes, it can control the flow of transmission fluid and the pressure within the transmission, which allows gear changes.

Signs of Solenoid Failure

Failing solenoids can be a simple fix. Although you can still drive your vehicle, it is important to get your vehicle checked by a professional if you have any of the following symptoms.


Check Engine Light is On

Any time there is a check engine light, the vehicle needs to be checked for a diagnostic. So, if you have a check engine light on, you should get your vehicle check by a professional mechanic soon.


Delayed Shifting

When your vehicle is taking longer to shift gears, it could be a failing solenoid. A problem that is causes a failing solenoid could be due to dirty transmission fluid. Dirty transmission fluid can cause solenoids to get stuck and remain opened or closed. This problem could result in it being difficult to change gears.


Car Stuck in Neutral

A vehicle stuck in neutral could also signify that your solenoid is having trouble opening or closing, commonly from dirty transmission fluid like mention above. Cars stuck in neutral have solenoids that can receive signals of a command, but it unable to carry out the command.


Revving When Braking

A car rev when braking can mean that the solenoids are unable to receive signal of a gear change. This can be due to contaminated transmission fluid building up.


A great preventative for transmission problems, such as failing solenoid, is to regularly change transmission fluid to prevent dirty fluid from building up in your transmission. If you have any solenoid problems or any transmission problems, be sure to bring your vehicle to a professional transmission mechanic like Eagle Transmission Repairin Mesquite Texas serving all the DallasMetroplex area.



...
signs of a bad torque converter in dallas tx
By Eagle Transmission Repair Shop September 3, 2025
Signs and Symptoms of a Bad Torque Converter What are the signs of a bad torque converter? Slipping out of gear is a common sign ...
checking transmission fluid - transmission repair
August 14, 2025
The transmission is a complex machinery, but fortunately, it can show signs when there is a problem. If you have a transmission problem, it can affect the function of your entire vehicle.
Questions Answers sign - FAQs about Transmission Repair
August 7, 2025
Have a question about a transmission repair or transmission problem? Read some of our Frequently Asked Questions about transmission repairs or visit our FAQs page. You can also call us at Eagle Transmission Mesquite for any other questions you may have.
Torque converter in transmission shop
July 18, 2025
Torque converters have a complex design, but it can experience failure if symptoms go unchecked. The torque converter is a vital part for the function of automatic transmissions. It is what controls the shifting during accelerating and decelerating.
stop-and-go traffic is ruining your transmission
July 11, 2025
he daily stop-and-go traffic can cause more than just stress on you, but on your transmission as well. Your transmission can have major effects from stop-and-go traffic, especially when left unchecked.
Heavy duty truck - overheating transmission
July 3, 2025
Overheating is possible with any vehicle, but especially with heavy duty trucks that have to tow substantial loads. A minor overheat can lead to expensive repair, while worst case scenario can cause transmission failure.
Red Car - Transmission Repair
July 2, 2025
Transmission fluid lubricates and cools the transmission components. Without transmission fluid, the transmission will not function and ...
BMW - Transmission repair - Mesquite Texas
By John Henry February 26, 2025
Regardless of what type of BWM that you own, regular transmission maintenance is crucial for the efficiently and longevity of your BMW. Find out how to make your transmission last longer.
Check Engine Light On - Transmission Repair
December 1, 2024
If your vehicle is experiencing an error code that begins with “P”, then it indicates that you have a problem with the Powertrain, which could mean a transmission problem. This article with discuss how to know what your error code means.
Ford Truck - Transmission repair
November 20, 2024
If your Ford is showing you warning signs of a transmission problem, then it is important to not ignore them. So, it is vital that you know what the warning signs are for your Ford.