5.7 hemi oil pump problem?

A friend has a 2007 hemi ram and it shut off on him and wont restart. He says it sounds like its trying to start. He said the oil pressure gauge was fluctuating a day previous but then it went back to normal. He had a oil pressure problem when he bought the truck last year(used) and the dealership replaced the oil pump.
My question is does it have a low oil pressure safety switch that will keep it from running? He is about 8 hours from home and stranded.