P0257 Fault Code

P0257 OBD-II Trouble Code Short Description

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

What does trouble code P0257 mean?

The P0257 error code indicates that the fuel injection pump is not delivering fuel properly due to an issue with the cam, rotor, or injector. This can cause a range of performance problems, including decreased acceleration, reduced power, and poor fuel efficiency.

To fix this issue, it is important to first identify the specific cause of the problem. This may require a diagnostic test using specialized equipment. Once the cause has been identified, it may be necessary to repair or replace the damaged component.

If left unchecked, the P0257 error code can damage other engine components and lead to more expensive repairs down the line. Therefore, it is important to address this issue as soon as possible.


What are the symptoms of the P0257 code?

Here are some common symptoms associated with a P0257 fault code:

  • Engine misfires or runs poorly
  • Rough idling
  • Decreased fuel efficiency
  • Decreased engine power
  • Difficulty starting the engine
  • Check Engine Light (CEL) illuminated

It is recommended to have a professional mechanic diagnose and repair this issue as it could potentially cause further damage to the fuel system or engine if left untreated.


What causes the P0257 code?

The P0257 fault code is typically caused by a failure in the fuel injection pump. This can be due to a variety of reasons, such as a malfunctioning camshaft sensor, a faulty fuel injector, or a problem with the fuel pump itself. Other possible causes may include issues with the fuel pressure sensor or a blocked fuel filter. In any case, the fault code means that there is a range or performance issue with the fuel metering control, and it will need to be diagnosed and repaired by a qualified mechanic.

Possible Solutions

How to fix P0257?

There are several potential causes and solutions for a P0257 fault code related to fuel metering control. Here are some possible steps to take:

  1. Check the injectors: The fault code may be related to a problem with one or more fuel injectors. Check the injectors for damage or wear, and replace as necessary. If there are no obvious issues with the injectors, a diagnostic tool may be needed to check for more specific problems.

  2. Check the fuel pump: If the fuel pump is not working properly, this can also cause P0257. Make sure the fuel pump is providing sufficient fuel flow to the engine.

  3. Check the fuel pressure: A fuel pressure test can reveal if the fuel system is not delivering enough pressure to the engine. If the pressure is too low, the fuel filter or fuel pressure regulator may need to be replaced.

  4. Check the fuel lines: Any leaks or blockages in the fuel lines can cause issues with fuel delivery, leading to P0257. Inspect the fuel lines for signs of damage or wear, and replace as necessary.

  5. Check the fuel rail: The fuel rail may be blocked or damaged, preventing proper fuel delivery to the injectors. Check the fuel rail and replace if necessary.

  6. Check the camshaft sensor: The camshaft sensor can also be a source of problems with fuel metering control. Check the sensor and connections for damage, and replace if necessary.

Overall, fixing a P0257 fault code will require identifying and addressing the specific cause of the problem in your car's fuel system. Consult your car's manual or a qualified mechanic for further guidance.