What are the common causes of P0257?

A faulty fuel metering control valve B. A fuel pressure regulator that will not hold pressure. Clogged fuel injectors. A restricted fuel filter. A failing fuel pump.

Compare commanded and actual metering control B on a scan tool. Check fuel pressure and the pressure regulator. Inspect the fuel filter and lines for restriction. Test the injectors for a clogged pattern. Replace the fuel metering control valve B if the command is not followed. Clear the code and retest.

P0257

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

System: Injector circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P0257 means Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector).

Where it lives

For P0257, start at the injector the description names.

Check these first

A faulty fuel metering control valve B
A fuel pressure regulator that will not hold pressure
Clogged fuel injectors
A restricted fuel filter
A failing fuel pump

What to do next

Compare commanded and actual metering control B on a scan tool
Check fuel pressure and the pressure regulator
Inspect the fuel filter and lines for restriction
Test the injectors for a clogged pattern
Replace the fuel metering control valve B if the command is not followed
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.