MasterTuning Fault code dictionary (DTC)

P0251 — Injection Pump Fuel Metering Control A Malfunction

Severity: Serious Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningThe engine control unit has detected a problem with the fuel metering control circuit on the injection pump. This means the computer is not getting the correct response or voltage from the pump's fuel pressure or volume regulator, which directly affects how fuel is delivered to the engine.
FamilyPowertrain (P)

Typical symptoms

Engine might crank but fail to start
Rough idling or engine stalling
Noticeable loss of engine power under acceleration
Check Engine light is turned on

Common causes

Faulty fuel injection pump regulator or actuator
Poor electrical connection or damaged wiring at the injection pump harness
Internal failure within the high-pressure fuel pump
Issues with the engine control unit

What to do

Have a technician check the electrical wiring and connector at the injection pump first, as loose or corroded pins are common. This issue affects how the engine gets fuel, so you should have it checked soon before it leaves you stranded.

Frequently asked questions

What does code P0251 mean?

Injection Pump Fuel Metering Control A Malfunction. The engine control unit has detected a problem with the fuel metering control circuit on the injection pump. This means the computer is not getting the correct response or voltage from the pump's fuel pressure or volume regulator, which directly affects how fuel is delivered to the engine.

Can I keep driving with code P0251 active?

With caution: limp mode possible, have it checked soon

Common causes — P0251

Faulty fuel injection pump regulator or actuator Poor electrical connection or damaged wiring at the injection pump harness Internal failure within the high-pressure fuel pump Issues with the engine control unit

How do you fix code P0251?

Have a technician check the electrical wiring and connector at the injection pump first, as loose or corroded pins are common. This issue affects how the engine gets fuel, so you should have it checked soon before it leaves you stranded.

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