Hi
P0715 is for the transmission input speed sensor. This sensor is used for shifting control. It's mounted on the front of the trans, threaded in just under where the cooler lines meet the trans. It has a two wire electrical connector, and a 1" hex for a socket for removal.
This code could be caused by the sensor's wiring, but it's very likely to be the sensor itself and it will need to be replaced. This isn't an uncommon failure.
The input speed sensor runs less than $20 at a parts store and will be in stock at any parts store or dealer. It only takes a few minutes to replace.
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