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P0087Diesel & RV
Hard

P0087 — Fuel rail/system pressure too low

Common-rail fuel pressure is below the ECM target. Hard starts, power loss, and derate mode are typical on heavy diesels.

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Likely causes

  • Weak or worn high-pressure fuel pump (HPFP)
  • Plugged fuel filter or restricted low-pressure supply
  • Pressure regulator or injector leaking on return

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Recommended checks

  1. 1

    Measure rail pressure at idle and under load

  2. 2

    Replace the fuel filter and inspect the lift pump

  3. 3

    Test the HPFP and injectors for return leaks

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Parts to replace