Just a comment to anyone who might experience this problem: After a Sunday drive, a few hours later I found the ignition switch would not turn, and I could not shift if out of park. Being an "internet guy", I immediately came to to this forum. While I did not find exactly what I was looking for, I did see a reference to pressing the brake pedal for several seconds as a "cure". Well, it worked! I am clueless as to why, but it worked. I did put a charger on the battery, just to get the status, and it was at 100%. Go figure. That said, my wife wonders about medical emergency -- we are in our 70s. I reckon, if we got time, I'll stand on the brake pedal again.