Well I have been having trouble with my the CRD shifting and was thinking it was the transmission. I posted a separate thread about it, but I pulled the code and it comes up with P0715, the scanner says ''Input/turbine speed sensor a circuit malfunction. Any ideas on what this is?

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-05 Dark Khaki Limited CRD. GDE ECO tune. In-tank lift pump, Transgo doo doo kit, B&M trans cooler, replaced trans solenoid pack and filters, Newer Michelin tires, Timing belt with all related parts replaced at 110,000miles.