Description of the P0252 fault code.
OBD2 Error Codes

P0252 Fuel metering pump “A” signal level (rotor/cam/injector) is out of range

P0252 – OBD-II Trouble Code Technical Description

Trouble code P0252 indicates a problem with the fuel metering pump “A” signal level (rotor/cam/injector).

What does the fault code mean P0252?

Trouble code P0252 indicates a problem with fuel metering pump “A”. This DTC indicates that the engine control module (ECM) is not receiving the required signal from the fuel metering valve.

Fault code P0252.

Possible reasons

Trouble code P0252 can be caused by various reasons:

  • Defect or damage to fuel dispenser “A” (rotor/cam/injector).
  • Incorrect connection or corrosion in the wires connecting the fuel meter to the engine control module (ECM).
  • Fuel metering valve malfunction.
  • Power or grounding problems associated with the fuel metering system.
  • Errors in the operation of the engine control module (ECM) itself, such as a malfunction or glitch in the software.

These are just a few possible causes, and to make an accurate determination it is necessary to diagnose the vehicle using specialized equipment.

What are the symptoms of a fault code? P0252?

Symptoms that may occur when trouble code P0252 is present may include the following:

  • Loss of Engine Power: It is possible that the vehicle will experience a loss of power when accelerating or when applying gas.
  • Engine Roughness: The engine may run erratically or erratically, including shaking, juddering, or rough idling.
  • Low or irregular fuel delivery: This can manifest itself in the form of skipping or hesitation when accelerating, or when the engine is idling.
  • Difficulty starting the engine: If there is a problem in the fuel supply, it may be difficult to start the engine, especially during a cold start.
  • Dashboard Errors: Depending on the vehicle and engine management system, a “Check Engine” warning light or other lights may appear to indicate problems with the engine or fuel system.

If you experience these symptoms, it is recommended that you contact a qualified auto mechanic to diagnose and repair the problem.

How to diagnose a fault code P0252?

To diagnose DTC P0252, the following steps are recommended:

  1. Checking the error code: First, you should use the OBD-II diagnostic scanner to read the error code from the vehicle's ECU (Electronic Control Unit).
  2. Checking electrical connections: Check all electrical connections connecting fuel dispenser “A” to the ECU. Make sure connections are secure, there are no signs of corrosion or oxidation, and there are no breaks or damage to the wiring.
  3. Checking fuel dispenser “A”: Check the condition and functionality of the fuel dispenser “A”. This may include checking winding resistance, fuel distribution mechanism function, etc.
  4. Checking the fuel metering valve: Check the fuel metering valve for proper operation. Make sure it opens and closes properly.
  5. Fuel supply system diagnostics: Check the fuel system for any problems such as clogged filters, fuel pump problems, etc.
  6. Checking the ECU software: In case all other components look normal, the problem may be related to the ECU software. In this case, the ECU may need to be updated or reprogrammed.
  7. Checking other sensors and components: Some fuel delivery problems can be caused by faulty other sensors or engine components, so it is recommended to check these as well.

If after performing the above steps the problem does not resolve or cannot be determined, it is recommended that you contact an experienced auto mechanic or auto repair shop for further diagnosis and repair.

Diagnostic errors

When diagnosing DTC P0252, the following errors may occur:

  • Skip checking electrical connections: Failure to check electrical connections correctly or insufficiently check their condition may lead to incorrect conclusions about the cause of the problem.
  • Insufficient check of fuel dispenser “A”: Failure to correctly diagnose the fuel meter or determine its condition may result in unnecessary costs to replace the faulty component.
  • Skipping fuel metering valve check: Malfunctions in the fuel metering valve may be missed during diagnosis, leading to an incorrect determination of the cause.
  • Ignoring other potential causes: Some other problems, such as malfunctions of other fuel system components or problems with the ECU software, may be missed during diagnosis, which will also lead to an incorrect determination of the cause.
  • Inability to interpret scanner data: Incorrect reading and interpretation of the data received from the diagnostic scanner may lead to an incorrect analysis of the problem.
  • Neglect of diagnostic sequence: Failure to follow the diagnostic sequence or skip certain steps may result in missing important details and incorrectly identifying the cause of the problem.

To successfully diagnose the P0252 trouble code, you must carefully follow diagnostic procedures and techniques, as well as have sufficient experience and knowledge in the field of automotive repair and electronics. If you have any doubts or difficulties, it is recommended that you contact a professional.

How serious is the fault code? P0252?

Trouble code P0252 indicates a problem with the fuel meter or the signal circuit associated with it. Depending on the specific cause and nature of the problem, the severity of this code may vary.

In some cases, if the problem is temporary or involves a minor component such as wiring, the vehicle may be able to continue driving without serious consequences, although symptoms such as loss of power or engine roughness may occur.

However, if the problem involves major components such as the fuel metering valve or fuel metering valve, it can cause serious engine performance problems. Insufficient fuel supply can lead to loss of power, uneven engine operation, difficult starting, and even a complete stop of the vehicle.

In any case, the P0252 trouble code requires careful attention and diagnosis to determine the specific cause and resolve the problem. If left unattended, this problem can lead to further engine damage and other serious vehicle problems.

What repair will help eliminate the code? P0252?


Repairs to resolve DTC P0252 may include the following, depending on the specific cause:

  1. Checking and replacing fuel dispenser “A”: If fuel meter “A” (rotor/cam/injector) is faulty or not functioning properly, it should be checked and replaced if necessary.
  2. Checking and replacing the fuel metering valve: If the problem is with a fuel metering valve that is not opening or closing properly, it should be checked and replaced if necessary.
  3. Checking and restoring electrical connections: Check all electrical connections connecting fuel dispenser “A” to the engine control module (ECM). If necessary, repair or replace connections.
  4. Checking and servicing the fuel supply system: Check the fuel system for problems such as clogged filters, faulty fuel pump, etc. Clean or replace components if necessary.
  5. Updating or reprogramming the ECM: In case the problem is related to the ECM software, the ECM may need to be updated or reprogrammed.
  6. Additional renovations: Other repairs may need to be performed, such as replacing or repairing other fuel system or engine components.

Repairs must be carried out taking into account the specific cause identified as a result of diagnosis. To accurately determine the cause of the malfunction and carry out repair work, it is recommended to contact a qualified auto mechanic or car service center.

P0252 Injection Pump Fuel Metering Control A Range 🟢 Trouble Code Symptoms Causes Solutions

One comment

  • anonym

    Hallo , ich habe eine C 220 W204 und habe folge Probleme Fehler Code P0252 und P0087 P0089 alles gewechselt und Fehler kommt wider jemanden mit gleichen Probleme?

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