What do transmission solenoids do

A bad transmission solenoid can negatively affect many components of your automatic transmission. Transmission solenoids are electro-hydraulic valves that control the flow of the transmission fluid through the transmission in the car, and they open and close due to the electrical signals that they gain from the vehicle or the transmission control unit, which gains data from various speed sensors located within the engine.

Since a clutch controls the gear shifting in the manual transmission of a car, the transmission solenoid is in control of the transmission within the automatic car, performing the same task. Furthermore, the transmission system in your automatic car has different kinds of solenoids — shift solenoids, lockup solenoids, and the transmission control solenoids.

There are many causes and reasons as to why your transmission solenoids could have failed and caused various symptoms of a bad transmission solenoid.

When the transmission control unit sends signs and information to the transmission solenoids to shift either up or down, these values have to open or close to allow and restrict the flow of the transmission fluid. The fluid in the transmission is in charge of pressurizing the transmission system and allowing your car to change gears smoothly.

If you notice the symptoms of a bad transmission solenoid, you might lose the ability to use multiple gears in your vehicle, and one gear might become particularly stuck, or the gear might not be able to move at all.

Make sure you know the difference between a slipping transmission and a transmission solenoid problem. You will be able to tell the difference when you try to shift -when you have a slipping transmission, the shifting can actually occur, but produce very little power.

However, with a bad transmission solenoid, the solenoid can prevent the shifting from even happening in the first place. Most modern cars have some type of transmission control module that is in charge of monitoring the transmission through various sensors, like the shift-position sensor and the transmission speed sensor.

Furthermore, the transmission control module and the solenoid wiring are protected by various fuels, so if there is a failure or damage to one of the fuses or the wires, this can cause the symptoms of a bad transmission solenoid. The transmission control module isn't your vehicle is in charge of noticing any failure within the systems that it monitors. Any failure that it detects, ranging in severity from a broken or damaged solenoid to a blown fuse, will trigger and spur the limp mode to prevent any further engine damage or any further damage to the transmission.

Even when the limp mode is activated, the car can still somewhat work, allowing the driver to travel in a limited capacity. Generally, the limp mode will affect the bad transmission solenoid. It allows your car to go into second gear and remain there. This can lead to a slow feeling when you first start driving, preventing full acceleration, and making the engine RPMs be much higher than usual in order to go the same speed.

Make sure you do not drive with your car in limp mode for too long, as this can cause various symptoms of a bad transmission control solenoid. The easiest way to tell is by paying attention to your dashboard warning lights, typically a Check Engine light or Transmission warning light. You may also notice that your vehicle has shifting delays or that it refuses to shift into higher gears altogether. In some situations, a transmission fluid replacement or transmission flush can free up a shift solenoid that has become stuck, helping you avoid higher repair costs.

Transmission torque converter replacement could also be an option, depending on what exact parts are malfunctioning. If the problem is in the wiring, simply replacing the shift solenoid will not fix the problem. Proper diagnosis is especially important if the check engine light is on. Fast, free quotes, affordable prices, and many financing options available.

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