Their is a recall notice going out for 2011-2014 F250-F550 6.7's. You can look up your vin on the Ford site now and see it. Recall #14E03. I think it has to do with emission's.
Has to do with exhaust gas high temp sensors that can fail and report an excessively high exhaust temp. The computer issues a "stop safely now" message on the display. But can actually stop the engine before the operator has time to pull off to a suitable stopping place.