P0274 DTC code: Everything You Need to Know


In the world of automobiles, DTC codes play a crucial role in diagnosing and troubleshooting issues with the vehicle’s performance. One such code is P0274, which specifically pertains to a faulty fuel injector in a specific cylinder. In this article, we will delve deep into understanding the P0274 DTC code, its causes, symptoms, and possible fix options. So, let’s get started!

Understanding the P0274 DTC Code

The P0274 DTC code indicates an issue with the fuel injector in cylinder number 5 of the engine. It is a standardized diagnostic trouble code that is generated and stored in the vehicle’s onboard computer system, also known as the powertrain control module (PCM). When this code is triggered, it means that the fuel injector in cylinder 5 is not operating as it should, potentially leading to various performance problems.

Common Causes of P0274 DTC Code

There can be several causes that trigger the P0274 DTC code. It is important to identify the root cause to effectively resolve the issue. Here are some common causes associated with this code:

  1. Faulty Fuel Injector: The most common reason behind the P0274 code is a malfunctioning fuel injector in cylinder number 5. It could be due to a clogged nozzle, electrical issues, or mechanical failure.

  2. Wiring Issues: Wiring problems, such as damaged or loose connections, can lead to improper communication between the fuel injector and the PCM. This can trigger the P0274 code.

  3. Engine Mechanical Problems: Issues with the engine’s mechanical components, such as a faulty cylinder, low compression, or a damaged piston, can affect the performance of the fuel injector, leading to the P0274 code.

Symptoms of P0274 DTC Code

When the P0274 code is triggered, you may experience several symptoms, which can vary depending on the severity of the issue. Here are some common symptoms associated with this DTC code:

  • Rough Idle: The affected cylinder may result in an unstable or rough idle, which can be felt through vibrations when the vehicle is stationary.

  • Engine Misfire: A misfire may occur in the engine, leading to reduced power and acceleration. You may also notice a lack of smoothness during acceleration or while maintaining a constant speed.

  • Illuminated Check Engine Light: The PCM detects the issue and triggers the check engine light on the vehicle dashboard to alert the driver about the problem.

  • Decreased Fuel Efficiency: A faulty fuel injector can cause an imbalance in the fuel-to-air ratio, resulting in decreased fuel efficiency and increased fuel consumption.

Diagnosing and Fixing P0274 DTC Code

Diagnosing the P0274 code requires a systematic approach and suitable diagnostic tools. Here are the steps typically followed to diagnose and fix this issue:

  1. Scan for Codes: Use an OBD-II scanner to retrieve the P0274 code from the PCM. This will provide a starting point for your diagnosis.

  2. Inspect Fuel Injector: Check the fuel injector in cylinder number 5 for any visible signs of damage, such as leaks, clogs, or loose connections. Clean or replace the injector if necessary.

  3. Test Wiring and Connections: Examine the wiring and connections associated with the fuel injector. Look for any damaged wires, loose connections, or corroded terminals. Repair or replace the wiring as needed.

  4. Perform Cylinder Compression Test: Conduct a compression test on cylinder number 5 to ensure there are no underlying mechanical issues, such as low compression or a damaged piston. Address any engine mechanical problems accordingly.

  5. Clear Codes and Test: After resolving the identified issues, clear the DTC codes from the PCM using the OBD-II scanner. Take the vehicle for a test drive to confirm if the problem has been successfully resolved.

Frequently Asked Questions (FAQs)

Q1. Can a faulty spark plug cause the P0274 DTC code?

A1. While a faulty spark plug can potentially lead to engine misfires, it is not directly associated with the P0274 code. However, it is advisable to inspect and replace spark plugs as part of regular vehicle maintenance.

Q2. Should I continue driving if the P0274 code is triggered?

A2. It is recommended to address the issue as soon as possible to prevent any further damage to the vehicle. Continuing to drive with a faulty fuel injector may result in increased fuel consumption, decreased performance, and potential engine damage.

Q3. Can I fix the P0274 code myself, or do I need a professional mechanic?

A3. While some basic inspection and cleaning tasks can be performed by DIY enthusiasts, diagnosing and fixing the P0274 code usually requires advanced diagnostic tools and knowledge. It is recommended to seek assistance from a qualified automotive technician for a proper diagnosis and repair.


The P0274 DTC code points towards a problem with the fuel injector in cylinder number 5 of your vehicle’s engine. Understanding the causes, symptoms, and fixes associated with this code is crucial for maintaining optimal vehicle performance. By following proper diagnostic procedures and addressing the identified issues promptly, you can resolve the P0274 code and enjoy a smooth and efficient driving experience. Remember to consult a professional if you are unsure about any step in the diagnosis and repair process.

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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