HINO-P0093 serious Hino ›

Fuel System Leak Detected - Large Leak

The HINO-P0093 (Hino) diesel fault code means: Fuel System Leak Detected - Large Leak. This is a serious severity code.

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Keep driving?
Short distances only
DIY difficulty
intermediate
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What Are the Symptoms of HINO-P0093?

  • Check Engine Light on
  • Fuel smell or visible fuel leak
  • Hard starting or loss of power

What Causes HINO-P0093? (Most Likely First)

  • Leaking high-pressure line or fitting High
  • Leaking injector or return Moderate
  • Rail pressure sensor reading incorrectly Low

Can I Still Drive with HINO-P0093?

Short distances only. HINO-P0093 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

What does P0093 mean on a Hino?

P0093 means Fuel System Leak Detected - Large Leak. The engine computer has detected a fuel pressure drop that indicates a large leak in the fuel system.

Is P0093 a Hino-specific code?

No. P0093 is a generic OBD-II code defined by SAE J2012, so it means the same thing on any vehicle that sets it. The exact conditions Hino uses to set it on its diesels are in Hino service information.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose HINO-P0093?

  1. Stop and look for leaking fuel before running the engine; diesel on a hot exhaust is a fire risk.

  2. Inspect high-pressure lines and fittings.

  3. Compare desired and actual rail pressure on a scan tool.

Sources 3

This page is built from documented references. Verify against your own service info before repair work.

  • Hino service bulletin SB-14-029 (filed with NHTSA)troubleshooting for DTC P2201 and P2214 on 2011-2015 Hino 238, 258, 268 and 338, showing these trucks report SAE diagnostic trouble codes
  • SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
  • SAE J2012Diagnostic Trouble Code Definitions (defines P0093 as a generic OBD-II code)

P0093 on Other Platforms

The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:

Gas / Automotive (OBD-II) Generic OBD-II definition for P0093 Isuzu serious Fuel System Leak Detected - Large Leak Kubota serious Fuel System Leak Detected - Large Yanmar serious Fuel System Leak Detected - Large

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More Hino codes → Diesel home All diesel codes Heavy-duty Guides

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