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P0314 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.


Understanding Diagnostic Trouble Codes (DTC) is essential for maintaining your vehicle’s health. One such code is P0314, which may be found in the OBD system of your vehicle. We shall examine the definition, characteristics, causes, symptoms, diagnosis, common mistakes, and possible remedies for P0314 as part of this complete guide. Let’s get started with determining what P0314 means.


To fully grasp P0314, let’s break down its meaning:

  • “P” stands for Powertrain, indicating that the issue affects the engine and transmission.
  • “0” denotes a generic code that applies to all vehicle makes and models.
  • “3” specifies that it’s a misfire code.
  • “14” indicates a single-cylinder misfire but does not specify the cylinder number.

In essence, P0314 informs you that there’s a single-cylinder misfire in your engine, but it does not provide information about which cylinder is affected.


Now, let’s explore the common causes behind P0314:

  • Ignition System Issues: Problems with the ignition system, such as faulty spark plugs, ignition coils, or ignition wires, can lead to misfires in one or more cylinders.
  • Fuel Delivery Issues: A misfire might be caused by inadequate fuel delivery to one or more cylinders.
  • Vacuum leaks: The air-fuel combination can be messed up by leaks in the intake manifold or vacuum lines, which can result in misfires.
  • Sensor issues: Defective sensors, such as the Mass Airflow Sensor (MAF) or the Crankshaft Position Sensor, might send the engine control module the wrong information, which can lead to misfires.


P0314-related problems can show up in many different ways, including:

  • Check Engine Light: The check engine light on your dashboard turning on is the most typical sign.
  • Rough Idling: If you see your car idling roughly, it often means there was a cylinder misfire.
  • Reduced Power: Engine misfires may significantly lower the power and overall performance of an engine.
  • Increased Emissions: Prolonged misfires can result in higher emissions, which may affect your vehicle’s compliance with emissions standards.


It’s critical to use a methodical diagnostic approach when dealing with a P0314 code:

  • Code Scan: Start by retrieving the code and learning its specifics using an OBD-II scanner.
  • Visual Inspection: Look for wear or damage on the spark plugs and ignition coils that are part of the ignition system.
  • Check the fuel system: Make sure that the fuel delivery system is operating properly by testing the fuel pressure and injectors.
  • Sensor evaluation: Check the accuracy of important sensors, such as the MAF sensor or the crankshaft position sensor.

Common mistakes

  • Some frequent errors to prevent while diagnosing and fixing P0314 include:
  • Misfires can result from neglecting basic maintenance, which includes changing spark plugs at the proper intervals.
  • Replacing components without doing enough testing could result in time and financial waste.
  • Ignoring other relevant codes or problems, since misfires may occasionally be a sign of deeper difficulties.

How serious is this?

Several factors, including the cause and extent of the malfunction, determine the severity of a P0314 code. Although it is not an immediate emergency, ignoring this signal can result in decreased engine performance, increased emissions, and possible damage to the catalytic converter over time. To avoid further problems, it is advisable to diagnose and repair the problem immediately.

What repairs can fix the codeS?

repair manuals

The repairs needed to address P0314 will depend on the specific cause but may include:

  • Replacing faulty spark plugs or ignition components.
  • Addressing fuel delivery issues, such as clogged fuel injectors or a failing fuel pump.
  • Fixing vacuum leaks in the intake system.
  • Replacing malfunctioning sensors that contribute to the misfire.

Related codes

P0314 may be associated with other related codes, such as:

  • P0300: “Random/Multiple Cylinder Misfire Detected,” which indicates misfires occurring in multiple cylinders.
  • P0301, P0302, P0303, etc.: These codes specify misfires in individual cylinders, with the last digit indicating the cylinder number (e.g., P0301 for cylinder 1 misfire).


P0314 is a diagnostic trouble code that points to a single-cylinder misfire in your engine, without specifying the cylinder. We must understand its significance, causes, symptoms, and diagnosis process to be able to properly address this issue. Your vehicle’s performance can be restored and possible damage avoided if it is properly diagnosed and repaired. If you encounter a P0314 code, it’s advisable to consult a qualified mechanic to ensure a proper diagnosis and resolution, keeping your vehicle running smoothly.

P0314 Code – What Does It Mean & How To Fix It