Mitsubishi Fault Code

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P0093

Engine stalls under load; Sudden loss of power; "Large Fuel Leak" warning.

System

Not specified

Symptom

Engine stalls under load; Sudden loss of power; "Large Fuel Leak" warning.

Diagnosis & fix steps

Fuel System Leak Detected - Large Leak. LOGIC: The ECU sees a massive drop in rail pressure that doesn't align with commanded fuel delivery. ACTION: 1. Check the Fuel Rail Pressure Relief Valve (PRV) for "weeping." 2. Perform an injector leak-back test. 3. Inspect high-pressure lines for cracks. FIX: Replace leaking Injector or the Pressure Relief Valve on the fuel rail.

Red Seal field insights

If there are no external leaks, the PRV is usually the culprit. Pull the return hose off the PRV at the end of the rail; if fuel is coming out at idle, the valve is weak and dumping pressure.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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