What is a solenoid
3 Answers
Solenoid is a relay of sorts that uses a small electrical current to control or switch on or off a much larger electric current.
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Depending on which type of solenoid you are referring to, do some reading at the link...https://en.wikipedia.org/wiki/Solenoid
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I had the exact same problem with my 03 explorer, OD light on. Since I have a friend who has had a tranny shop for 45 years, he fixed mine. It took him about ten minutes to do the repair. He stated it was a solenoid attached to the tranny. What and where, I do not know.