Code Definition

P1094 — Large Fuel Leak Detected

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Holden

About P1094

P1094 is a manufacturer-specific powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1094 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

On these Holden common rail diesel engines the Engine Control Module (ECM) monitors the high pressure fuel rail pressure with the rail pressure sensor and controls the high pressure pump and relief valve to hold the target. DTC P1094 sets when the ECM detects a sudden, large drop in rail pressure beyond a predefined threshold despite a valid pump or regulator command, indicating a significant leak in the high pressure fuel system. Unlike a gradual low pressure code, this points to a major leak path such as a ruptured line, a relief valve stuck open, or an injector dumping fuel. Symptoms can in...

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