Has only 30,000 miles."service engine soon" light came on.

What is your question?

Dealer service said code #PO 745 indicated solenoid valve cycle not consistent. Nissan does not provide part but does entire valve body at $930 cost. Service mngr said a transmission shop could get part at much lower cost. Is this serious problem? Should I go to tranny shop? Will this affect Tenn. emission annual inspection for licence renewal