OBD Guide
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P0256

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

P0256 is an OBD-II diagnostic trouble code meaning: Injection Pump Fuel Metering Control B (Cam/Rotor/Injector). Common causes: malfunction of the fuel injection pump metering solenoid valve, wear of the cam disc or injection pump rotor. Estimated repair cost: $56–889.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–889 (est.)

Symptoms

  • Reduced power and thrust of a diesel engine
  • Black smoke from the exhaust pipe
  • Increased diesel fuel consumption
  • Unstable operation at idle
  • Check Engine Light Illuminates

Causes

  • Malfunction of the fuel injection pump metering solenoid valve
  • Wear of the cam disc or injection pump rotor
  • Low pressure in the booster pump circuit
  • Fuel contamination or filter clogged
  • Violation of the electric injection pump control circuit

How to Fix

  1. Read error codes and check for adjacent codes
  2. Check the fuel pressure at the injection pump inlet
  3. Check the electrical circuit of the metering valve
  4. Replace the fuel filter
  5. Carry out fuel injection pump diagnostics on a specialized stand
  6. In case of mechanical wear - repair or replacement of fuel injection pump

Related codes

P0250P0251P0252P0253P0254P0255P0257

Error P0256 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0256 code mean?

P0256 is an OBD-II diagnostic trouble code that indicates: Injection Pump Fuel Metering Control B (Cam/Rotor/Injector)

What causes a P0256 error code?

The most common causes of P0256 include: Malfunction of the fuel injection pump metering solenoid valve; Wear of the cam disc or injection pump rotor; Low pressure in the booster pump circuit; Fuel contamination or filter clogged.

How do I fix a P0256 diagnostic trouble code?

To fix P0256: Read error codes and check for adjacent codes. Check the fuel pressure at the injection pump inlet. Check the electrical circuit of the metering valve. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0256?

Yes, but get it checked soon

How much does it cost to fix P0256?

The estimated repair cost for P0256 is $56–889. Actual cost depends on your vehicle, location, and labor rates.

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