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P0093Diesel & RV
Moderate

P0093 — Fuel system leak detected — large leak

The ECM sees a major fuel-pressure drop that points to a large leak in the high- or low-pressure system. This can be dangerous—fix it promptly.

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Likely causes

  • Cracked or disconnected fuel hose or fitting
  • Faulty injector with a major external leak
  • Failed fuel pump or pressure regulator

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Recommended checks

  1. 1

    Visually inspect the entire pressurized fuel circuit

  2. 2

    Replace damaged hoses or fittings immediately

  3. 3

    Test injectors and the pump for internal/external leaks

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Parts to replace