Error code

OBD2 P0258

OBD2P0258
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Injection Pump Fuel Metering Control 'B' Low (Cam/Rotor/Injector).

Severity

moderateCan drive, but symptoms may affect performance and safety.

Summary

P0258 indicates a low signal voltage issue in the fuel metering control circuit of the injection pump 'B' on diesel engines, specifically related to the cam/rotor/injector.

Symptoms

  • Hard or no starting conditions
  • Excessive smoke from the tailpipe
  • Rough idling or running
  • Poor acceleration and loss of power
  • Vehicle hesitation upon acceleration
  • Reduced fuel economy

Common Causes

  • Restricted flow to high pressure pump (clogged/dirty fuel filters/strainers)
  • Fuel contamination by bacteria, dissolved waxes, or water in the fuel
  • Burnt, damaged, shorted, or corroded wiring and connectors
  • Defective fuel pressure sensor
  • Defective fuel control actuator
  • Defective high pressure pumps
  • Defective electric lift pumps (if fitted)
  • Failed or failing fuel control actuator driver circuit in the PCM

Diagnosis

  1. Check for clogged/dirty fuel filters/strainers.
  2. Inspect for bacterial growth or wax contamination in the fuel system.
  3. Perform a thorough visual inspection of all wiring and connectors.
  4. Test resistance, ground, and continuity on associated wiring.
  5. Verify proper operation of fuel shut-off solenoid (if fitted).
  6. Check electric lift pump control circuit if applicable.
  7. Test fuel pressure at the rail using dedicated diesel fuel pressure gauge.

Fixes

  • Replace faulty components such as wiring, connectors, fuel filters/strainers, or sensors based on diagnosis.

FAQ

What should I do if the code appears after using bio-diesel?

Inspect for waxy substances in fuel lines and filter. Clean the tank and fuel lines chemically to remove dissolved waxes.

How can I prevent bacterial growth in my diesel fuel system?

Regularly check and clean the fuel system, especially if using bio-diesel or storing fuel for extended periods.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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