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OBD-II fault code definitions, symptoms, causes, and step-by-step diagnostics.
Standardized generic DTCFuel & air metering / injector control

P0258 — Injection Pump Fuel Metering Control B Low

P0258 is the standardized powertrain DTC for “Injection Pump Fuel Metering Control B Low.” The code identifies the monitored condition; it does not by itself prove which part failed.

Standardized generic definition
Injection Pump Fuel Metering Control B Low
DTC category
Fuel & air metering / injector control
Diagnostic priority
High if rail pressure is far from commanded, the engine stalls, or fuel leakage is suspected.
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What P0258 means

P0258 is the standardized powertrain DTC for “Injection Pump Fuel Metering Control B Low.” The code identifies the monitored condition; it does not by itself prove which part failed.

Start with the stored data and the simplest external checks before replacing the component named in the code.

Possible symptoms

  • Hard start or no-start
  • Hesitation or loss of power
  • Stalling
  • Possible lean/rich codes
  • Check Engine Light

Causes to test

These are diagnostic possibilities, not a statistical parts-replacement ranking. Vehicle-specific service information takes priority.

  • Weak pump or restricted filter/supply
  • Pressure regulator/control valve fault
  • Rail-pressure sensor or wiring fault
  • High-pressure pump problem on direct-injection/diesel systems
  • Fuel leak or injector leakage
  • Power/ground/relay issue

Step-by-step diagnostic workflow

  1. Treat gasoline direct-injection and diesel high-pressure systems as hazardous; follow depressurization procedures.
  2. Compare commanded and actual pressure during crank, idle, and load.
  3. Verify low-side supply before condemning a high-pressure pump.
  4. Check sensor reference, signal, and ground for plausibility.
  5. Perform pressure-retention/leak tests only with approved procedures and equipment.
  6. Clear codes only after repair, then complete an appropriate drive cycle and verify the code and symptoms do not return.
Preserve evidence: EPA OBD guidance emphasizes that stored DTCs and freeze-frame data are important to proper diagnosis. Save them before clearing codes.

Scan data worth checking

  • Commanded and actual rail pressure
  • Low-side fuel pressure if available
  • Fuel pump command/duty
  • Battery voltage during crank
  • Fuel trims

Severity and drivability

High if rail pressure is far from commanded, the engine stalls, or fuel leakage is suspected.

Stop driving and investigate immediately if there is a flashing MIL, oil-pressure warning, overheating, fuel leakage, severe misfire, major loss of power, abnormal mechanical noise, or a transmission that is slipping badly.

Common diagnostic mistakes

  • Opening a high-pressure fuel system without proper depressurization
  • Replacing the high-pressure pump before checking low-side supply
  • Assuming a pressure-sensor code proves the sensor is bad

Related generic codes

P0257 — Injection Pump Fuel Metering Control B Range/PerformanceP0259 — Injection Pump Fuel Metering Control B HighP0256 — Injection Pump Fuel Metering Control B MalfunctionP0260 — Injection Pump Fuel Metering Control B IntermittentP0255 — Injection Pump Fuel Metering Control A IntermittentP0254 — Injection Pump Fuel Metering Control A High

Source and accuracy notes

Generic DTC structure and standardized definitions are governed by SAE J2012/J2012DA. Actual enable criteria, thresholds, circuit pinouts, test values, software conditions, and repair procedures vary by vehicle. Use current OEM service information for the exact year/engine/calibration and check applicable manufacturer technical service bulletins. See the site methodology and primary-reference policy.