I recently had an RF modulator installed in my 01 Max to control my JVC Cg changer. I noticed that the Check engine light came on as I was driving home from the shop. The code that came up is P0740 Torque Converter Clutch Circuit Malfuction. The car shifts normally. I wonder if this circuit is controlled by a fuse that may blown or installer forgot to re-install a connector.

Need your help please? Thanks and Happy Easter.