Possible causes
– Faulty fuel pump
– Blocked fuel filter
– Faulty fuel pressure solenoid
– Faulty Fuel injector
– 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 Sierra
2003-2004 GMC Topkick C4500/C5500 Series
GMC Factor Service Bulletin OBDII Code P0093 or P1093
2001-2004 GMC Sierra
2003-2004 GMC Topkick C4500/C5500 Series
GMC Factor Service Bulletin OBDII Code P0087, P0093, P1093
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0093 GMC OBD Code Description