astroev said:Today I was going down steep hill near our house in B mode, outside air temp about 73. At the bottom of the hill it flipped into turtle mode, charge went to 0 bars, and the Check EV System warning light came on. Pulled into nearby lot. I power cycled multiple times with no joy, but after about 30 minutes I tried again, just as the tow truck came, and all was good. 52,000 miles. I guess I'll not take it in and see if it recurs.
Reporting back on this. Tony at Palo Alto said it was the "Tesla gateway ECU" failed. They got a replacement from Tesla same day(!!) and replaced it. No charge as under the 60,000 mile warranty.