Fuel System Leak Detected Large Leak
Table of contents
P0093 GMC Possible Causes
- Faulty fuel pump
- Blocked fuel filter
- Faulty fuel pressure solenoid
- Faulty Fuel injector
How do I fix code P0093 GMC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- There is a Factor Service Bulletin for the following GMC models:
- 2001-2004 GMC Sierra
- 2003-2004 GMC Topkick C4500/C5500 Series
- GMC Factory Service Bulletin OBDII Code P0093
Cost of diagnosing the P0093 GMC code
The cost of diagnosing the P0093 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0093 GMC Description
The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) Sensor to determine fuel pressure to the fuel injectors. This is then compared to the calculated target fuel pressure as determined by the Engine Control Module. The Engine Control Module adjusts the Fuel Rail Pressure by modulating the duty cycle of the control driver of the fuel pressure regulator. Injector pulse duration is determined by the measured rail pressure and the target injection fuel into each cylinder. The Engine Control Module monitors the fuel system. The Engine Control Module sets the OBDII code when it detects a large fuel system leak.