Description of the P0258 fault code.
OBD2 Error Codes

P0258 Low signal level in the control circuit of the fuel metering pump "B" (cam/rotor/injector)

26.05.2022 /

P0258 – OBD-II Trouble Code Technical Description

Trouble code P0258 indicates a low signal on the fuel metering pump "B" (cam/rotor/injector) control circuit.

What does the fault code mean P0258?

Trouble code P0258 indicates that the engine control module (ECM) has detected too low or no voltage in the fuel metering valve circuit. This code indicates problems with the electrical circuit that controls fuel delivery to the engine, which can result in insufficient fuel delivery and engine malfunction.

Fault code P0258.

Possible reasons

Some possible reasons for the P0258 trouble code:

  • Fuel metering valve malfunction: Problems with the valve itself, such as a clogged, broken or broken valve, can result in insufficient fuel flow.
  • Damaged wires or connectors: Damaged or broken wires or faulty connectors can open the electrical circuit and cause P0258.
  • Corrosion or oxidation of contacts: Corrosion or oxidation on the wire pins or connectors can cause poor contact and result in low voltage in the fuel metering valve circuit.
  • Engine control module (ECM) malfunction: Problems with the ECM itself can cause the fuel metering valve to miscontrol and cause trouble code P0258.
  • Power problems: Insufficient power supply voltage, such as due to a weak or dead battery, can also cause this error to appear.
  • Fuel pressure sensor: A faulty fuel pressure sensor may provide incorrect data to the ECM, which may result in insufficient fuel delivery and a P0258 code.
  • Fuel system problems: Problems with the fuel system, such as a clogged fuel filter or a faulty fuel pump, can also cause this error.

What are the symptoms of a fault code? P0258?

Some typical symptoms that may occur when the P0258 trouble code appears:

  • Loss of power: One of the most common symptoms is loss of engine power. This may manifest itself as sluggish acceleration or an overall decrease in engine performance.
  • Unstable idle: Engine idle may be unstable, including roughness or even failure.
  • Twitching or jerking when moving: If the fuel metering valve is faulty, there may be a jerking or jerking sensation when the vehicle is moving.
  • Frequent engine stops: If the fuel supply is insufficient or its dosage is incorrect, frequent engine stops or freezing may occur.
  • Increased fuel consumption: Fuel consumption may increase due to improper operation of the fuel supply system.
  • Frequent jumps in idle speed: Irregular fluctuations in engine idle speed may occur.
  • The appearance of smoke from the exhaust system: Improper mixing of fuel and air may result in black or white smoke from the exhaust system.
  • The car may not start: In some cases, especially if the problem is serious, the car may not start at all.

If you notice any of these symptoms in your vehicle and trouble code P0258 appears, it is recommended that you contact a qualified auto mechanic to diagnose and repair the problem.

How to diagnose a fault code P0258?

To diagnose DTC P0258, the following steps are recommended:

  1. Checking the error code: You must first use a diagnostic scanner to read trouble codes, including P0258. This will help determine what specific error was recorded in the system.
  2. Checking electrical connections: Inspect all wires and connectors associated with the fuel metering valve for damage, corrosion, or breaks. Make sure all connections are secure.
  3. Voltage test: Using a multimeter, measure the voltage in the fuel metering valve circuit. The voltage must be within the limits specified in the technical documentation for the specific make and model of the car.
  4. Checking the fuel metering valve: Check the operation of the fuel metering valve itself for clogging, breaks or damage. You can also check for transmission.
  5. Checking sensors: Check the functionality of sensors related to the fuel supply system, such as the fuel pressure sensor. Make sure they work correctly and provide correct data.
  6. Check ECM: If all of the above checks do not reveal the problem, you may need to check the Engine Control Module (ECM) itself. Contact a professional auto mechanic or service center to perform this check.
  7. Checking the fuel system: Check the presence of fuel, the condition of the fuel filter and the functionality of the fuel pump. Problems with the fuel system can also cause P0258.

After completing these steps, if you are unable to determine the cause of the error or resolve it, it is recommended that you contact a qualified auto mechanic or service center for further diagnosis and repair.

Diagnostic errors

When diagnosing DTC P0258, the following errors may occur:

  • Misinterpretation of symptoms: One common mistake is misinterpreting symptoms as a problem with the fuel metering valve, when in fact the cause may be another component of the system.
  • Skip checking electrical connections: Insufficient attention to checking the condition of electrical connections, which may result in missed detection of breaks, corrosion or other problems with the wires.
  • Faulty diagnostic tools: Use of faulty or uncalibrated diagnostic tools, which may result in incorrect data and incorrect diagnosis.
  • Insufficient component testing: Incorrect or insufficient testing of fuel system related components such as the fuel metering valve or fuel pressure sensor.
  • Skipping ECM Check: Diagnosis failure due to failure to test the Engine Control Module (ECM) itself for faults.
  • Misinterpretation of data: Incorrect understanding of diagnostic data, which may lead to misinterpretation of the cause of the malfunction.
  • Neglect of additional factors: Neglecting additional factors, such as the condition of the fuel system or the vehicle's electrical system, which may also be the cause of the P0258 code.

To avoid these errors, it is important to carefully conduct a comprehensive diagnosis, considering all possible causes of the problem and carefully checking all components associated with the fuel supply system. In case of doubt or difficulty, it is recommended to contact a qualified auto mechanic or service center.

How serious is the fault code? P0258?

Trouble code P0258 indicates a problem in the fuel delivery system, which can have serious consequences for engine performance. Depending on the specific reason for this code, the severity of the problem may vary.

Whether the cause is a faulty fuel metering valve or an electrical connection issue, insufficient fuel delivery can result in poor engine performance, loss of power, rough idling, and other unpleasant symptoms. If the problem is ignored, there may be a risk of damage to the engine or its components.

Therefore, although the P0258 code itself is not critical in nature, it is important to take it seriously and promptly diagnose and repair the fault. It is recommended that you contact a qualified auto mechanic or service center for diagnosis and repair to prevent further engine problems and ensure safe vehicle operation.

What repair will help eliminate the code? P0258?

The repairs required to resolve the P0258 trouble code depend on the specific cause of this error. Some possible steps that may help resolve the issue:

  1. Replacing the fuel metering valve: If the problem is with the fuel metering valve itself, it should be replaced. The new valve must be installed according to the vehicle manufacturer's recommendations.
  2. Repair or replacement of electrical connections: Check all electrical connections associated with the fuel metering valve for damage, corrosion, or breaks. Defective wires or connectors should be replaced or repaired.
  3. Checking and replacing the fuel pressure sensor: If the problem is due to insufficient fuel pressure, you should check the fuel pressure sensor and replace it if necessary.
  4. ECM diagnostics and repair: If all of the above steps do not resolve the problem, the problem may be due to a problem with the Engine Control Module (ECM) itself. In this case, diagnosis and possibly repair or replacement of the ECM is necessary.
  5. Checking and updating ECM software: Sometimes updating the ECM software can help correct fuel control problems.
  6. Checking the fuel system: Check the condition of the fuel system, including the fuel filter and fuel pump. Clogged or malfunctioning components can also cause P0258.

Repairs should be performed by a qualified auto mechanic or service center to ensure the problem is corrected correctly and the fuel system is restored to normal operation.

P0258 Injection Pump Fuel Metering Control B Low 🟢 Trouble Code Symptoms Causes Solutions

P0258 – Brand-specific information

Trouble code P0258 can have different meanings depending on the vehicle manufacturer, several examples for different brands:

These are just a few examples of how different manufacturers may interpret the P0258 code. For your specific vehicle make and model, it is always recommended to refer to the official documentation or service manual for more accurate trouble code information.

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