Dodge Cummins Diesel Forum - View Single Post - P0087 when half full tank only
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post #3 of (permalink) Old 06-21-2019, 10:23 AM
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The only experience I've had with this code (low rail pressure) was on my buddy's Duramax. Not sure how it relates to half tank of fuel though. Personally I would start by checking the pressure relief valve on rail and return rates on injectors. Is truck smoking more than you feel it should? On the Duramax it ended up being a bad cp3 pump but not sure I'd go there on yours given the mileage. I'd start with things like the lift pump, fprv, and injectors probably.
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