OBD code P0093

The ECU interprets a major loss of pressure or flow in the fuel circuit.

Estimated severity

High

Common symptoms

Diesel or fuel smell
Stains or dripping under the vehicle
Engine stalls or will not start
Limp mode
Sudden power loss

Likely causes

External leak in pipes, filter or connections
Excessive internal injector leak-off
Damaged high-pressure pump
Faulty rail pressure sensor
Pressure regulator unable to maintain flow

Recommended checks

1. Do not keep cranking the engine if there is visible fuel leakage or a strong smell.
2. Inspect fuel lines, filter, unions and injectors for dampness or dripping.
3. Read rail pressure during cranking and check whether it drops quickly.
4. Perform an injector leak-off test.
5. Repair any leak before clearing codes or forcing road tests.

What does code P0093 mean?

Code P0093 is usually associated with a major pressure drop in the fuel system. On common-rail diesel engines, it may point to an external leak, excessive injector leak-off, a pump unable to hold pressure or an implausible rail pressure sensor reading. It is especially serious if there is fuel smell or visible staining under the vehicle.

Try assisted diagnostics