Replacement Fuel Pressure Regulator. Fits 2004.5-2005 Chevy / GMC 2500HD / 3500HD LLY. Bosch Part # 0928400653. Replacing a faulty fuel pressure regulator may solve the common surging and loping idle that many high mileage Duramax’s have. Trucks exhibiting codes P0090, P0089 and P1093 may be suffering from a failed/failing pressure regulator. Need more parts for your Duramax or pulling truck? Take a look at our website Here!