What is the VSS on a transmission?

The vehicle speed sensor (VSS) is also commonly referred to as a transmission speed sensor or output shaft speed sensor. It is a small device—typically mounted somewhere on the transmission—that determines how fast your vehicle is going by measuring the rotation of a toothed wheel on a shaft inside the transmission. via

Can a transmission speed sensor cause limp mode?

Yes, a defective wheel speed sensor can cause limp mode in a car. A bad wheel speed sensor can result in a loss of traction control and stability. via

What are all the sensors on the transmission? (video)

https://www.youtube.com/watch?v=0BVdiUvHgOw

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