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Power Strokes
6.4 Tech
P252F
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[QUOTE="dieseljosh07, post: 225756, member: 122"] Its not rail pressure. Like Dustin said its got to do with cylinder contribution and also short term fuel trim. If the short term fuel trim of a cylinder is outside of the threshold then it causes derate mode and reduced power. It uses fuel trim as a parameter for oil level overfull because if the oil level were to high it would be fueling from the CCV therefore the fuel trims would be out of spec. I'm still not sure at what rate of fuel adjustment this code is set. [/QUOTE]
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