Anyone have any experience with this code on a Fusion? It's telling me the car isn't heating up fast enough and pointing to a thermostat problem. It has since reset and not returned but when or hopefully IF it returns I'd like to be "in the know" so to speak.

at some point the t-stat stuck open. I have replaced a couple for this.

The coolant sensor is telling the ECU, it's too cool for a period time while the engine is warming up!
It could be a bad sensor or a stuck thermostat.

Check coolant level when cold, and make sure the fan is'nt on, thus cooling the coolant system during warm up period.

If the Air cond is on during warm up period, the air condenser fan could be keeping the coolant colder in the system for a longer period of time.

Thanks for the info. The CE light has been off almost two months so still hoping this was a one off glitch.

Light finally stayed on long enough to let the dealer see it. They changed the T-stat. Fell under the emissions warranty so didn't pay a dime.