P0093: Fuel System Leak Detected - Large Leak
3 vehicles · 2 makes · $300-$12,000 repair
Most Reported On
P0093 is an OBD-II diagnostic trouble code meaning “Fuel System Leak Detected - Large Leak.” This code indicates the engine computer detected a large leak in the fuel system, typically a significant drop in fuel rail pressure that it cannot maintain. It is common on high-pressure direct-injection and diesel systems, where the computer watches commanded versus actual fuel pressure. A large pressure loss suggests fuel is escaping or the system cannot build pressure. This can cause hard starting, loss of power, stalling, and is a potential fire hazard if fuel is leaking externally. This code is most commonly reported on 2011-2016 Chevrolet Silverado 2500HD, 2011-2016 Chevrolet Silverado, and 2019-2023 Genesis G70 (2.0T, 3.3T, Sport, Sport Advanced, Sport Prestige, Launch Edition), with repair costs ranging from $300 to $12,000.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0093, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (3)
FAQ
What does P0093 mean?
P0093 stands for "Fuel System Leak Detected - Large Leak." This code indicates the engine computer detected a large leak in the fuel system, typically a significant drop in fuel rail pressure that it cannot maintain. It is common on high-pressure direct-injection and diesel systems, where the computer watches commanded versus actual fuel pressure. A large pressure loss suggests fuel is escaping or the system cannot build pressure. This can cause hard starting, loss of power, stalling, and is a potential fire hazard if fuel is leaking externally.
What are the most common causes of P0093?
The most common causes of P0093 are: Leaking or cracked high-pressure fuel line or fitting, Faulty fuel injector (leaking or stuck open), Failed high-pressure fuel pump, Damaged or leaking fuel pressure regulator, Loose or degraded fuel system seals/O-rings, Faulty fuel rail pressure sensor, Restricted fuel supply preventing pressure buildup. The specific cause varies by vehicle.
How much does it cost to fix P0093?
Repair costs for P0093 range from $300 to $12,000, depending on the vehicle and root cause.
Which vehicles are affected by P0093?
Au7o has documented P0093 across 3 vehicle models from 2 manufacturers: Chevrolet, Genesis.
Sources (7)
- ForumDiesel Place Forum Thread: CP4 Fuel Pump Failure on LML Duramax
- articleGM Duramax Diesel CP4 Fuel Pump Lawsuit Certified In Seven States — GM Authority
- Forum2011-2016 LML Duramax Diesel CP4 Fuel Pump Issues and Lawsuit — Duramax Forum
- articleGM/Ford CP4 Fuel Pump Defect Class-Action Litigation — Hagens Berman
- RecallRepairPal — Recall 24V528000: Fuel Pump Fails Causing Loss Of Drive Power
- NHTSANHTSA Part 573 Safety Recall Report 24V-528 (Genesis 023G)
- ForumGenesis Owners — "So now there's a recall on the G70 fuel pump?"
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.