Running down the road at about 70 mph, level ground, car good and warmed up. Suddenly I hear the engine rev up, look down to see the tach at about 3200 RPM....hmmm seems t have come out of overdrive. Pull the shifter back from D to 3 and yep, sure enough, it's running in what some would refer to as "direct drive" (3rd). Shifting back into D does no good, lifting off of the gas pedal, the revs drop to about 1200, and the car seems to be in a very free coast. Step down on it again, revs climb back to 3200 and transmission will not shift to OD. I drive the next few miles, trying different combinations of throttle, load, shifter postition, all leading to no change.
Pull the car into a shop, wife hops out to get something, I raise the hood, check the transmission fluid level, with the car in park, idling. It seems to be a bit overfull, no discoloration.
Shut it off and wait for the wife, about 15 minutes.
Start it up and take off for the house, completely normal operation, can't seem to get it to even blink like it's going to repeat it's little "episode".
Car has 35,600 miles, not been abused. If I take it to the dealer while still under warranty, and they can't get it to do it, it's sure to puke at about 36,002 miles, right after the warranty expires, right?
If I've identified a fault before the expiration, but they can't reproduce it until after the expiration, am I covered?
Anybody got any suggestions on what to look at next? I get the impression that this transmission is completely electronic control.