Fault code: PO715 what piece is needed to correct the problem

Hi, I have a zafira 2004 automatic diesel, with Y20dth engine. The spanner light goes on after 15 seconds, and there's no regular power in drive gear. Gear 1 and 2 work fine. Scan gives P0715 Input/turbine speed sensor circuit malfunction.

How can I fix this? Is this a sensor that needs to be replaced? Do you have a code for this piece and/or a picture of it, and where it goes?

Thank you very much,
David