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Not sure what happened there, you could look over electrical connectors at trans.
Code- P0740 Torque Converter Clutch, No RPM Drop @ Lockup.
On level ground after driving a while so trans is hot, take a dipstick reading. Is it on the full line, if not add a bit of ATF+4.
So went for a ride to see if I could tell anything was going wrong and all was good. I got back turned it off and then turned it on again, it shuddered and acted like it was gonna die...like when you run out of gas. Then when I went to start it again it wont start. Still po740 code only.
What brand model of scanner are you using ? Possibly a shop scanner & read the pending codes & even the trans codes would be a good Idea.
Anyone with a snap on ultra scanner can also read the CVI (clutch volume index) readings...