DTC P0255: Injection Pump Fuel Metering Control “A” Intermittent

Understanding potential issues that can affect a vehicle’s performance is crucial for any car owner. DTC P0255, specifically related to “Injection Pump Fuel Metering Control ‘A’ Intermittent,” is a concern that can impact engine fuel delivery. In this guide, we will delve into the causes, symptoms, inspection methods, resolutions, and the process of clearing DTC P0255. Armed with this information, you can confidently address the intermittent issue and ensure optimal fuel system functionality.

1. Causes of DTC P0255:

DTC P0255 is triggered when the engine control module detects intermittent signal issues from the injection pump fuel metering control “A.” Several factors can contribute to this intermittent issue:

  • Faulty Injection Pump: Intermittent malfunctions in the injection pump can lead to erratic fuel metering and delivery.
  • Electrical Issues: Intermittent wiring problems or poor connections in the fuel control circuit can disrupt signal transmission.
  • Voltage Fluctuations: Variations in voltage supply to the injection pump can result in intermittent signal readings.
  • Sensor Instability: A sensor related to fuel metering might exhibit instability, leading to intermittent readings.

2. Symptoms of DTC P0255:

Recognizing potential symptoms can help you identify the intermittent issue promptly:

  • Irregular Engine Performance: Your vehicle might experience occasional loss of power, acceleration, or overall performance.
  • Intermittent Smoke: You might notice intermittent instances of excessive smoke emitting from the exhaust due to inconsistent fuel metering.
  • Occasional Fuel Efficiency Issues: Fuel efficiency might intermittently decline due to the inconsistent fuel delivery.

3. Inspection of DTC P0255:

Conducting a thorough inspection is vital for accurate diagnosis of the intermittent issue:

  • Visual Examination: Inspect the injection pump, wiring, and connectors for any intermittent damage or corrosion.
  • Injection Pump Testing: Test the injection pump’s operation and performance during both regular and intermittent conditions.
  • Wiring Check: Inspect the fuel control circuit wiring for intermittent damage, corrosion, or loose connections.
  • Voltage Check: Ensure stable voltage supply to the injection pump during intermittent periods.

4. Resolving Causes of DTC P0255:

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

  • Replace Faulty Injection Pump: If the injection pump exhibits intermittent malfunctions, consider replacing it.
  • Repair Wiring and Connections: Fix intermittent wiring issues or connectors in the fuel control circuit.
  • Stabilize Voltage Supply: Address voltage fluctuations to ensure stable signal readings from the injection pump.
  • Replace Faulty Sensor: If a sensor related to fuel metering is unstable, replace it with a compatible part.

5. Clearing DTC P0255:

After addressing the root cause of the intermittent issue, 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.
  • Intermittent Test Drive: Take the vehicle for a test drive under various conditions to confirm that the intermittent issue has been resolved and the light remains off.


Addressing intermittent issues like DTC P0255 requires persistence and attention to detail. By understanding the potential causes and taking proactive steps, car owners contribute to the longevity and efficiency of their vehicles. Embracing responsible car ownership involves 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, even when dealing with intermittent challenges.