# Transmission solenoid

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A **transmission solenoid** or **cylinoid** is an [electro-hydraulic valve](https://en.wikipedia.org/w/index.php?title=Electrohydraulic_valve&action=edit&redlink=1) that controls fluid flow into and throughout an [automatic transmission](/source/Automatic_transmission). [Solenoids](/source/Solenoid) can be normally open or normally closed. They operate via a voltage or current supplied by the transmission computer or controller. [Transmission](/source/Transmission_(mechanical_device)) solenoids are usually installed in a transmission valve body, [transmission control unit](/source/Transmission_control_unit), or transmission control module.[*[clarification needed](https://en.wikipedia.org/wiki/Wikipedia:Please_clarify)*]

## Types

- [Variable force solenoid](/source/Variable_force_solenoid)

- On-off solenoid

- [Pulse-width modulated](/source/Pulse-width_modulation) solenoid

- Low leak variable bleed solenoid

## Manufacturers

- [American Axle](/source/American_Axle)

- [ZF](/source/ZF_Friedrichshafen)

- [TREMEC](/source/TREMEC_Corporation)

- [BorgWarner](/source/BorgWarner)

- [Eaton](/source/Eaton_Corporation)

- [Bosch](/source/Bosch_(company))

- [Hilite Industries](https://en.wikipedia.org/w/index.php?title=Hilite_Industries&action=edit&redlink=1)

- [Saturn Engineering and Electronics](https://en.wikipedia.org/w/index.php?title=Saturn_Engineering_and_Electronics&action=edit&redlink=1)

- [TLX Technologies](https://en.wikipedia.org/w/index.php?title=TLX_Technologies&action=edit&redlink=1)

## References

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Adapted from the Wikipedia article [Transmission solenoid](https://en.wikipedia.org/wiki/Transmission_solenoid) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Transmission_solenoid?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.