I was just driving my 2008 / 3.8L around town here - in a 40 MPH zone. All of a sudden, the transmission seemed like it didn't want to shift into overdrive (at 40 mph, I was high revving at like 45000 RPMs

Then the check engine light came on (whats the trick to read the codes ?)

I pulled over and shut it off

no unusual smells, no leaks, no broken belt that I could see

Started up again. I turned afround to bring it home - first few shifts from a dead stop went OK, but when I got close to 40, it seemed to search for a gear and revved high again

I have just over 47K miles on the vehicle and its been serviced regularly ...

Since there is no dipstick to check - what's my options ?

What are your thoughts ? Transmission gone ???