A transmission solenoid or cylinoid is an electro-hydraulic valve that controls fluid flow into and throughout an automatic transmission. Solenoids can be normally open or normally closed. They operate via a voltage or current supplied by the transmission computer or controller. Transmission solenoids are usually installed in a transmission valve body, transmission control unit, or transmission control module.
Types
- Variable force solenoid
 - On-off solenoid
 - Pulse-width modulated solenoid
 - Low leak variable bleed solenoid
 
Manufacturers
- American Axle
 - ZF
 - TREMEC
 - BorgWarner
 - Eaton
 - Bosch
 - Hilite Industries
 - Saturn Engineering and Electronics
 - TLX Technologies
 
References
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