Q: Murano 2004 step motor P1778 rpm transmutation failures

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I have P1778 code, 2004 Murano 140k Miles. Rpm fluctuates and doesn’t “shift” gear. I understand it’s probably step motor, however I can’t find this step motor for my year. How come is this so?

My car has 140000 miles.
My car has an automatic transmission.

The reason you cannot get the step motor is due to it is an internal transmission component and this transmission is a CVT transmission and not rebuildable and must be replaced since no repair parts are available.

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