Dunnnc, I also found them very helpful, I never called about this problem. I thought it might be battery related, but then I read that when the battery is weak, it will flash a crossed out battery pic on the monitor when that sensor comes up. Also, it wasn't just one, at times it was two or three....
2011 SV 264
2009 Expedition Eddie Bauer 5.4L
Nights camped in 2011 - 31
Nights camped so far in 2012 - 59