[BNaylor]

You can try replacing the vehicle speed sensor (VSS) but it may not fix your problem. The input speed sensor (ISS) is not the same as the vehicle speed sensor (VSS) that runs the speedometer. ISS is located inside the tranxsaxle housing facing the drive sprocket on the input shaft. For P0717 to set the PCM is detecting no signal. If the VSS sensor was the cause the VSS DTC codes would set first before ISS. In order to generate P0717 there can be no VSS error codes detected as a condition.

The reference voltage for the ISS comes from the PCM. Without pulling the tranny some troubleshooting can be performed before deciding it's an internal problem and big bucks.

You can disconnect the PCM 80 pin connector, make sure its clean and tight. Next disconnect the 20 way connector on the driver's side, top of the tranny. Disconnect and reseat it. If that doesn't help, on the 20 way connector with a mulitimeter in ohms position, the ISS sensor can be checked for a range of resistance.

At 20 way electrical connector pin S to V (tranny side):

68 degrees F = 893 - 1127 ohms
190 degrees F = 1132 - 1428 ohms

If not in this range the ISS is bad. Good luck!