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Of both the 2008 6.4l that I have the second one finally threw the dreaded code with only 4000 miles left on the warranty! First one went within 4 months of owning. Really pisses me off that Ford didn't turn this into a recall seeing as they know it was the pre 08/07 production dates. So they just figure they will wait until it happens? What if my warranty had expired? Now I have another vehicle down with no production and will probably take them a week to fix.
that code stands for high pressure fuel pump gasket failed from a chafed and shorted out wire harness under the pump cover. also same for dtc p0004.
I replace one about 6 months ago. it came back. disassembeld and checked it found correctly installed with all updated parts and did the same thing.