P0257: Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector)
Do not keep driving
Expect reduced power. If both metering controls have stored codes, that pairing points at fuel supply or fuel quality rather than the pump internals.
What this code means
The second metering control is electrically sound but not achieving the commanded delivery. Where both A and B report performance faults together, the shared supply — filter, lift pump, or contaminated fuel — is a far better suspect than two independent metering circuits wearing at once.
Likely causes
Start here
- Restricted fuel filter · easy
- Worn injection pump metering assembly · specialist
- Fuel contamination · specialist
- Weak low pressure lift pump · moderate
Less common
- Air leak in low-pressure fuel line · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P0257.