DTC P0257: Injection Pump Fuel Metering Control “B” Range/Performance

Understanding potential issues that can affect a vehicle’s performance is crucial for any car owner. DTC P0257, specifically related to “Injection Pump Fuel Metering Control ‘B’ Range/Performance,” is a concern that can impact engine fuel delivery. In this comprehensive guide, we will delve into the causes, symptoms, inspection methods, resolutions, and the process of clearing DTC P0257. With this information, you can confidently address the issue and ensure optimal fuel system functionality.

1. Causes of DTC P0257:

DTC P0257 is triggered when the engine control module detects that the injection pump fuel metering control “B” is operating outside the expected range or not performing as intended. Several factors can contribute to this issue:

  • Faulty Injection Pump: A malfunctioning injection pump for control “B” can lead to improper fuel metering and delivery.
  • Electrical Issues: Wiring problems or poor connections in the fuel control circuit “B” can disrupt operation.
  • Fuel System Problems: Issues within the fuel system specific to control “B,” such as clogs or leaks, can impact metering.
  • Sensor Malfunction: A sensor related to fuel metering for control “B” might not be providing accurate readings.

2. Symptoms of DTC P0257:

Recognizing potential symptoms can help you identify the issue promptly:

  • Reduced Engine Performance: Your vehicle might experience decreased power, acceleration, or overall performance.
  • Excessive Smoke: You might notice excessive smoke emitting from the exhaust due to improper fuel metering for control “B.”
  • Poor Fuel Efficiency: Fuel efficiency may decline as a result of incorrect fuel delivery specific to control “B.”

3. Inspection of DTC P0257:

Conducting a thorough inspection is vital for accurate diagnosis:

  • Visual Examination: Inspect the injection pump, wiring, and connectors specific to fuel control “B” for any damage or corrosion.
  • Injection Pump Testing: Test the injection pump’s operation and performance using appropriate tools for control “B.”
  • Wiring Check: Inspect the fuel control circuit “B” wiring for damage, corrosion, or loose connections.
  • Fuel System Inspection: Examine the fuel system for potential issues specific to control “B,” such as clogs or leaks.

4. Resolving Causes of DTC P0257:

Based on your inspection, take these steps to address the issue:

  • Replace Faulty Injection Pump: If the injection pump for control “B” is faulty, replace it with a compatible replacement.
  • Repair Wiring and Connections: Fix damaged wiring or connectors in the fuel control circuit “B.”
  • Resolve Fuel System Issues: Address any problems within the fuel system specific to control “B” to ensure proper fuel delivery.
  • Replace Faulty Sensor: If a sensor related to fuel metering for control “B” is faulty, replace it with a compatible part.

5. Clearing DTC P0257:

After resolving the root cause, clear the code and reset the check engine light:

  • OBD-II Scanner: Use an OBD-II scanner to clear the code and turn off the check engine light.
  • Test Drive: Take the vehicle for a test drive to confirm that the issue has been resolved and the light remains off.


Understanding issues like DTC P0257 and proactively addressing them showcases your dedication to maintaining your vehicle’s performance. By staying informed about potential problems, car owners contribute to the longevity and efficiency of their vehicles. Embrace responsible car ownership by both enjoying the driving experience and ensuring the health of the vehicle’s fuel system. This guide is here to support every step of your journey as a car owner.