My temperature was "--" tonight as well. I had just put in my Edge EZ and I looked up on the way home and saw that. Some of the things that fix that sort of thing on the brand F trucks are turning the key off and restarting or disconnecting the batteries and reconnecting. I hit the first traffic light and shut her off and restarted and it was back to normal. I honestly figured that while on the stepstool putting in the EZ, that I may have jarred the connection at the sensor, but since I read this, I figure that even the best trucks can't be perfect!