Q:

What is an automatic transmission solenoid?

A:

Quick Answer

A transmission solenoid is an electrically operated valve present in automatic-transmission vehicles. The valve controls the flow of fluid in and throughout the automatic transmission.

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Full Answer

The components of a transmission require the constant circulation of transmission fluid to reduce the friction between the moving parts and to cool the entire system. In an automatic transmission, this circulation of fluid is controlled by solenoids. When it's time to shift between gears, the solenoids receive an electrical signal and redirect the flow of the fluid to the desired gears. In modern vehicles that have an on-board computer to control and monitor the vehicle in its operating state, the solenoids are controlled by the computer.

The purpose of a transmission is to deliver power from the engine to the drive shaft. Every engine has a range of revolutions per minute within which it runs best. The transmission ensures that the engine keeps operating within that suitable rpm range, regardless of the speed of the vehicle. It operates through a number of gear combinations and changes gear ratios to suit the condition of the engine. Automatic transmission is a kind of vehicular transmission system that has the capability to automatically adjust gear ratios within the system, thus freeing the driver from manually changing gears.

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Related Questions

  • Q:

    How do you diagnose automatic transmission problems?

    A:

    To diagnose an automatic transmission problem, check the level of the transmission fluid to make sure the vehicle is not losing fluid, check the transmission system for leaks, and check the transmission filter to make sure it isn't clogged. If there are no problems in any of these areas, it is likely that the transmission needs rebuilding.

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  • Q:

    What makes an automatic transmission whine?

    A:

    There are several reasons why an automatic transmission makes a whining sound. The transmission pump makes this sound as pressure increases with rotational speed. This occurs while stationary and increases as the vehicle accelerates. A clogged transmission filter creates a similar sound to a whining pump. If the vehicle is low on transmission fluid, it can also cause a whining sound, accompanied by gear shifting problems and other habitual issues.

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  • Q:

    What are the symptoms of automatic transmission problems?

    A:

    Common symptoms of automatic transmission problems include gear slippage, transmission fluid leakage or transmission fluid that is dark and smells burnt. In addition, rough or clunky gear changes can also be a sign of transmission trouble.

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  • Q:

    How do you rebuild an automatic car transmission?

    A:

    Rebuilding an automatic transmission involves removing the transmission from the vehicle and servicing each part of the transmission as necessary. Some parts of an automatic transmission often only need cleaning during a rebuild, but others may require more intricate maintenance or replacement.

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