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iveco 75 e 17 error code 231?

hi i have an edc light on error code 231 it says the rail overpressure vaolve control signal is too low,
weve removed all the injectors replaced them and tightened em up but it hasnt sloved the problem n e one have any suggestions please
jo, April 2013
check your fuel regulating valve and fuel pressure pump

allan, April 2013
wiring or pressure relief valve

norb, April 2013
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