P0305 Code: Cylinder 5 Misfire Detected

The OBD-II code P0305 means that the powertrain control module (PCM) has detected a misfire in one of the engine’s cylinders. It usually stems from a problem with the ignition system, fuel system, or internal engine components.

Read this guide to learn more about the P0305 error code—what it means, its symptoms and causes, as well as tips for diagnosis and repair.

What Does the Code P0305 Mean?

Diagnostic trouble code (DTC) P0305 stands for “Cylinder 5 Misfire Detected.” This means that the powertrain control module (PCM) has counted enough misfire events on cylinder 5 to store the misfire code for that cylinder.

If you need help locating the misfiring cylinder, read our guide about cylinder location and firing order. You may also read our technical discussion about how the engine computer identifies which cylinder is misfiring.

Otherwise, continue reading to learn the most common causes of the P0305 code.

What are the Possible Causes of the P0305 Code?

A thorough diagnosis can pinpoint the exact cause of code P0305. Common causes of the code include:

• Ignition system problems (e.g.a worn spark plug or failed coil pack)
• Fuel system problems (e.g., failed fuel injector or damaged injector driver)
• Engine mechanical problems (e.g., a leaking valve or damaged lifter)

Note: If there are other codes stored in addition to P0305, the causes and symptoms may differ from those listed here.

What are the Common Symptoms of the P0305 Code?

Below are the most common symptoms that accompany the error code P0305 or a cylinder 5 misfire:

• Check engine light on or flashing
• Hesitating, stumbling, and jerking as you accelerate
• Lack of power during acceleration
• Rough idling
• Dying at stop signs (in extreme cases)
• Poor fuel economy

How to Diagnose the P0305 Code

Because there are so many potential causes for code P0305, diagnosis can be difficult. The root cause of the problem could be anything from a worn spark plug to a costly internal engine concern.

Hence, it’s a good idea to check for technical service bulletins (if you have access) that could help with the troubleshooting process.

Below are a couple of video references you can use to help you perform a diagnosis:

How to Fix the P0305 Code

Due to the diversity of vehicle models and the different conditions that can trigger code P0305, there isn’t really a universal solution for this issue—which can make it difficult to address the problem, especially if you’re not an expert.

If you’re confident enough to resolve the P0305 code on your own, make sure to consult the factory repair information to ensure the suitability of your repair approach. Use repair manuals or, better yet, invest in an ALLDATA single-vehicle subscription to expand your technical know-how.

When in doubt, don’t hesitate to reach out to your trusted mechanic. They’ll be able to help you pinpoint the exact cause of the issue and determine the best course of action.

Where to Get Ignition Components for Your Ride

Your ignition system is crucial to the operation of your vehicle. So if your scan tool logged code P0305 due to the ignition issues, it’s best to resolve it immediately. Luckily, it’s easy to find ignition system parts, like spark plugs and coil packs, here at CarParts.com.

You don’t need to leave your home to shop for the parts you need. You can do it on your phone or computer when you shop online at CarParts.com. Visit our website, filter the results to compatible parts using the vehicle selector tool, and make the selection more specific to your needs with the filters. It only takes a few minutes to find and order what you need.

All our products are available at unbeatable prices, so you can get high-quality ignition components without breaking the bank. These ignition components have all undergone strict quality control tests. Plus, our team of industry veterans handpick each part to ensure functionality and durability.

If you have queries about a specific product, our toll-free hotlines are open 24/7. Don’t ignore trouble codes and risk costly repairs. Check out the replacement parts you need, and get back on the road in no time!

Products Mentioned in this Guide

Spark Plug Fuel Injector Valve Lifter