Posted October 11, 2021 by Mark. Low rail pressure is one of the most common cause of a limp mode in the 2001 - 2010 6.6 Duramax. DTC codes P0087, P0093 or P1093 may set due to low rail pressure. Low rail pressure could be caused by a restricted fuel filter, air in the fuel, a bad pressure relief valve, excessive return fuel from the. n crown dresden mark
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