I have a 96 eldorado that comes up with a po717 code, it is very intermittent,I know it has to do with the trans turbin speed sensor, also know it's expensive to repair,
It acts a lot like a loose connector wire in that it does'nt happen all the time, and sometimes it resets all by itself.
Transmission works fine, even when the check engine light is on, I can reset the code and it might last a day or 10 minutes And in real cold temps like now it might stay off for a week. But it will come back, any ideas will sure be appricated. Thanks cropduster