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P0252 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


P0252 is a diagnostic trouble code that specifically relates to the Injection Pump Fuel Metering Control “A” Range/Performance. This code is stored in the Engine Control Module (ECM) when it detects a problem with the performance or range of control for the fuel metering control “A” in the injection pump. The performance of the engine as well as its fuel supply may be significantly affected by this issue.


In simpler terms, the P0252 code indicates a problem with fuel metering control on an injection pump that affects engine performance and fuel delivery. It indicates that the fuel injection system may not function within an expected range of performance, nor is it optimal.


Effective diagnosis and repair of the P0252 code depend on an understanding of its possible causes. Typical reasons include

  • Faulty Injection Pump: The injection pump may be broken or malfunctioning, which may affect fuel metering control “A.”
  • Wiring Issues: Performance issues might result from damaged or corroded wiring and connections in the fuel metering control circuit.
  • Fuel Quality: The effectiveness of the fuel metering control system might be impacted by poor-quality or contaminated gasoline.
  • Faulty ECM: An erroneous P0252 code might occasionally be caused by an ECM that isn’t working properly.


Recognizing the symptoms associated with the P0252 code can help pinpoint the issue. Common symptoms include:

  • Reduced engine power
  • Poor acceleration
  • Decreased fuel efficiency
  • Illuminated check engine light
  • Smoke from the exhaust


The P0252 code must be correctly diagnosed using a methodical methodology. The steps are as follows:

  • Code Scanning: Retrieve the P0252 code and any supplementary codes* using an OBD-II scanner.
  • Visual Inspection: Check for damage or corrosion on the injection pump and its wiring.
  • Checking the Injection Pump: Check the injection pump to make sure it is operating correctly and that the fuel metering control is within the desired range.
  • Wiring Inspection: Verify the circuit’s wiring and connections for continuity and fix any broken parts.
  • Fuel Quality Check: Ensure that the fuel being used is of high quality and free from contaminants.
  • ECM Check: If other causes are ruled out, consider testing or replacing the ECM.

Common mistakes

When working with the P0252 error code, avoid making these typical mistakes:

  • Neglecting Other Codes: Don’t focus solely on P0252; check for additional codes that may provide valuable diagnostic information.
  • Replacing Parts Unnecessarily: Proper diagnosis is key to avoiding unnecessary part replacements. Always follow a systematic approach.

How serious is this?

The extent to which an issue affects a P0252 code depends on its severity. If left untreated, this could result in severe engine performance problems and potentially expensive repairs if it does not promptly shut down your vehicle. If a code is not followed, fuel consumption will increase and engine components may be damaged.

What repairs can fix the codeS?

repair manuals

Once the problem has been identified, the necessary repairs can be made:

  • Change the Injection Pump: If the injection pump is determined to be defective, a new or rebuilt unit should be installed in its stead.
  • Repair or Replace wire: In the gasoline metering control circuit, repair or replace any frayed, corroded, or damaged wire and connections.
  • Cleaning the Fuel System: Clean the fuel system and use high-quality gasoline if the fuel quality is dubious.

Related codes

 Additional related codes can be attached to P0252 and are as follows:

  • P0250: Injection Pump Fuel Metering Control “A” (Cam/Rotor/Injector)
  • P0251: Injection Pump Fuel Metering Control “A” Range/Performance (Cam/Rotor/Injector)
  • P0253: Injection Pump Fuel Metering Control “A” Low (Cam/Rotor/Injector)


The Code P0252 DTC can be correctly identified and corrected in an efficient manner, although it is potentially problematic. In the long run, failing to comply with this code may cause an increase in engine stress, fuel consumption, and maintenance costs. Seek immediate professional assistance to make sure your vehicle’s optimum performance and fuel supply are restored if you notice the P0252 code or suspect any related problem.

P0252 Code – What Does It Mean & How To Fix It