DTC P0252: Injection Pump Fuel Metering Control “A” Range/Performance

Understanding potential issues that can affect a vehicle’s performance is crucial for any car owner. DTC P0252, specifically related to “Injection Pump Fuel Metering Control ‘A’ Range/Performance,” 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 P0252. Armed with this information, you can confidently address the issue and ensure optimal fuel system functionality.

1. Causes of DTC P0252:

DTC P0252 is triggered when the engine control module detects that the injection pump fuel metering control “A” is operating outside the expected range. Several factors can contribute to this issue:

  • Faulty Injection Pump: A malfunctioning injection pump can lead to improper fuel metering and delivery.
  • Electrical Issues: Wiring problems or poor connections in the fuel control circuit can disrupt operation.
  • Fuel System Problems: Issues within the fuel system, such as clogs or leaks, can impact metering control.
  • Sensor Malfunction: A faulty sensor related to fuel metering can result in inaccurate readings.

2. Symptoms of DTC P0252:

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.
  • Poor Fuel Efficiency: Fuel efficiency may decline as a result of incorrect fuel delivery.

3. Inspection of DTC P0252:

Conducting a thorough inspection is vital for accurate diagnosis:

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

4. Resolving Causes of DTC P0252:

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

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

5. Clearing DTC P0252:

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 P0252 and proactively addressing them demonstrates a commitment to maintaining your vehicle’s performance. By staying informed about potential problems, car owners contribute to the longevity and efficiency of their vehicles. Remember that 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.