HINO-P0251 serious Hino ›

Injection Pump Fuel Metering Control "A" (Cam/Rotor/Injector)

The HINO-P0251 (Hino) diesel fault code means: Injection Pump Fuel Metering Control "A" (Cam/Rotor/Injector). 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-P0251?

  • Check Engine Light on
  • Hard starting or no start
  • Loss of power

What Causes HINO-P0251? (Most Likely First)

  • Fuel metering actuator or control valve fault High
  • Damaged wiring or connector at the pump High
  • Engine computer driver fault Low

Can I Still Drive with HINO-P0251?

Short distances only. HINO-P0251 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

What does P0251 mean on a Hino?

P0251 means Injection Pump Fuel Metering Control "A" (Cam/Rotor/Injector). The engine computer has detected a fault in fuel metering control "A" on the injection pump.

Is P0251 a Hino-specific code?

No. P0251 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-P0251?

  1. Find which actuator is metering control "A" on your engine in the service information.

  2. Inspect the actuator connector and wiring.

  3. Check actuator resistance and command it with 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 P0251 as a generic OBD-II code)

P0251 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 P0251 Duramax serious Injection Pump Fuel Metering Control "A" (Cam/Rotor/Injector) Isuzu serious Injection Pump Fuel Metering Control 'A' Malfunction Power Stroke serious Injection Pump Fuel Metering Control "A" (Cam/Rotor/Injector)

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