P0093
OBD-II Diagnostic Code
Severity: CriticalWhat it means
P0093 means the fuel system has detected a significant fuel leak.
This is most common on diesel vehicles with high-pressure fuel systems.
Do not ignore this code — a fuel leak is a fire and safety hazard.
Affected Models
- All OBD-II vehicles (1996+)
- Common on diesel engines
Common Causes
- Fuel line cracked or loose connection
- Fuel injector seal leaking
- High-pressure fuel pump seal failure
- Fuel rail pressure sensor fault
- Fuel return line damaged
How to Fix It
-
Inspect for visible fuel leaks under the hood and under the vehicle.
Look for wet spots, fuel smell, or drips near the fuel lines, injectors, and fuel rail.
-
Check all fuel line connections for tightness.
Vibration can loosen connections over time.
Tighten any loose fittings. -
Have the fuel system pressure tested by a mechanic.
A pressure test reveals exactly where fuel is escaping.
Frequently Asked Questions
Can I drive with P0093?
No.
A fuel leak is a serious fire risk.
Have the vehicle towed if the leak is visible.
Is P0093 common on specific vehicles?
P0093 is most common on diesel vehicles (Duramax, Cummins, Power Stroke) due to their very high fuel pressures.