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  • The P0305 code stands for “Cylinder 5 Misfire Detected,” which means the powertrain control module (PCM) has counted enough misfire events on cylinder 5 to store the misfire code.
  • Possible causes for the P0305 code include issues with the ignition system, fuel system, or engine mechanical problems.
  • Symptoms of the P0305 code include an illuminated check engine light, unsteady or underpowered acceleration, and rough idling.

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?

electronic engine control unit triggering P0305
P0305 code means that the powertrain control module (PCM) has counted enough misfire events on cylinder 5 to store the misfire code for that cylinder.

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.

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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 as a symptom of P0305 code
A flashing check engine light is a common symptom of the P0305 code.

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.

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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

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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 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

About The Authors
Written By Automotive and Tech Writers

The Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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