Possible causes – Faulty fuel pump– Blocked fuel filter– Faulty fuel pressure solenoid– Faulty Fuel injector Tech description There is a factory service bulletin for the P0093 Code 2001-2004 GMC Sierra2003-2004 GMC Topkick C4500/C5500 SeriesGMC Factor Service Bulletin OBDII Code P0093 or P1093 2001-2004 GMC Sierra2003-2004 GMC Topkick C4500/C5500 SeriesGMC Factor Service Bulletin OBDII Code…