Started up my F150 Powerboost XLT remote this morning. I had somewhat low gas (60 miles to empty) and was parked on a fairly steep incline, bed at base of incline. Engine started electric, then kicked over to gas. I went out to car, pushed start button with brake depressed, engine kicked into electric, I backed out, but then shifted to Drive, and engine would not accelerate. Limped along for a few houses in electric at low speed. Stopped and light on dash said " Stop Safely Now." Turned off truck, and restarted, this time red icon said again "Stop Safely Now" and would not shift out of Park. Hmmm. Left vehicle for about 30 minutes in off. Came back, did not remote start, and pushed start button with brake depressed, and voila, it started. I filled up with gas and it seems to be operating normal again. Anyone else have this problem? Only 2100 miles on the truck. Any ideas?

 

I'm thinking the steep incline and your low gas made the truck think it was either out of gas or would be very soon.

The Stop Safely Now message was probably exactly that, telling you to stop somewhere safe before you ran out of gas.