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code EDC ( electronic diesel control) 03779 01 refers to fuel pressure too low in the common rail=== causes --blocked fuel filters, blocked vent control-- failing high pressure pump---
It is a specific MAN code and should be investigated by an accredited diesel shop with man experience
The fault cods EDC 03779,03778 have overlapping causes consist leakage of injectors,valve ,pipe but in some time malfunction in the high pressure pump , any one agree with me or there is any addition causes.
03779.....EDC ............ Rail pressure: Leakage in quantity compensation
03778.....EDC ...................Rail pressure: Leakage in overrun conditions
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EDC is for electronic diesel control , which i expect you knew , so i would get the OBD codes read to pinpoint the sensor/switch causing the issue , can't be more exact as you faile to mention vehicle make etc
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