P0301 Code: Cylinder 1 Misfire Detected

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Select your vehicle [Auto Repair](https://www.carparts.com/blog/auto-repair/)   »   [OBD-II Trouble Codes](https://www.carparts.com/blog/auto-repair/obd-ii-trouble-codes/)   »   P0301 Code: Cylinder 1 Misfire Detected ### [*check* Auto Repair Shop](/blog/car-repair-list-search-database/) ### [*shopping\_cart* Engine Parts](/engine-and-drivetrain) # P0301 Code: Cylinder 1 Misfire Detected Reviewed by [Richard McCuistian, ASE Certified Master Automobile Technician](/blog/author/richardmccuistian/) Technical Reviewer at CarParts.com Written by [CarParts.com Research Team](https://www.carparts.com/blog/author/thecpteam/) *-* Updated on May 22nd, 2025 Reading Time: 6 minutes Summary * A P0301 trouble code is stored when the powertrain control module (PCM) notices that several misfires are occurring in cylinder 1. * Ignition system problems, fuel delivery issues, and engine mechanical problems can cause on-board diagnostics (OBD) to store this trouble code. * If your vehicle has logged a P0301, you’ll notice several performance issues, including rough idling, hard starting, jerking, poor acceleration, and decreased fuel economy. **Contents** [hide](#) [1. What Does the P0301 Code Mean?](#What_Does_the_P0301_Code_Mean) [1.1. What are the Possible Causes of the P0301 Code?](#What_are_the_Possible_Causes_of_the_P0301_Code) [1.2. How a Misfire Happens](#How_a_Misfire_Happens) [2. What are the Common Symptoms of the P0301 Code?](#What_are_the_Common_Symptoms_of_the_P0301_Code) [3. How to Diagnose the P0301Code](#How_to_Diagnose_the_P0301Code) [4. How to Fix the P0301 Code](#How_to_Fix_the_P0301_Code) [5. Cylinder Number 1 Location and Firing Order](#Cylinder_Number_1_Location_and_Firing_Order) [6. Other Notes About Code P0301](#Other_Notes_About_Code_P0301) [7. Where to Get New Spark Plugs for Your Car](#Where_to_Get_New_Spark_Plugs_for_Your_Car) A P0301 is one of a series of [OBD-II error codes](https://www.carparts.com/blog/search-obd2-codes-list/) that are triggered when your vehicle’s computer has detected a “misfire.” What exactly does this diagnostic code entail? Read on to learn more about what a P0301 means, what its symptoms are, and how you can diagnose and troubleshoot the problem. ## What Does the P0301 Code Mean? Diagnostic trouble code (DTC) P0301 stands for “Cylinder 1 Misfire Detected.” The code indicates that the powertrain control module (PCM) has counted enough misfire events on cylinder 1 to store the misfire code for that cylinder. To learn more about cylinder 1 and firing order, read our explanation [here](https://www.carparts.com/blog/error-code-p0301-cylinder-1-misfire-detected/#Cylinder_Number_1_Location_and_Firing_Order). ### What are the Possible Causes of the P0301 Code? There is a multitude of possible causes for [misfire](https://www.carparts.com/blog/error-code-p0301-cylinder-1-misfire-detected/#How_a_Misfire_Happens) resulting in a stored P0301 trouble code: * Ignition system problems, such as: + A faulty worn spark plug + A failed coil pack or coil-on-plug coil + A bad spark plug wire on a vehicle that has plug wires * Fuel delivery issues, such as: + A faulty [fuel injector](https://www.carparts.com/fuel-injector) + Wiring issues with the fuel injector circuit (e.g., loose connections, damaged wires) + Problems with the powertrain control module, such as a damaged injector driver * Engine mechanical problems, such as: + A leaking valve + A worn piston ring, a damaged piston or damaged cylinder walls + A worn camshaft lobe or [damaged lifter](https://www.carparts.com/blog/bad-lifter-symptoms-noise-replacement-cost-and-more/) + A leaking [head gasket](https://www.carparts.com/cylinder-head-gasket) It’s worth noting that if there are also misfire codes stored for other cylinders, the list of potential causes will be different. The diagnostic process may be different. But if you’ve only got code P0301 stored, you’ll want to start by focusing on issues that only affect cylinder number 1. [See also  Timing Belt Symptoms, Diagnosis, Sample Replacement Steps](https://www.carparts.com/blog/timing-belt/) ### How a Misfire Happens Every time a given piston ends its compression stroke (traveling upward, both valves closed, squeezing the air-fuel mix), the ignition system sends an extreme high voltage pulse from the coil through the center of the spark plug, where, because of the high voltage, it jumps the gap between the center and side electrodes, triggering an ignition event begins right at the end of that upward piston stroke, and by the time the resulting combustion pressures have reached their peak, the piston is traveling downward. Each piston is responsible for its share of the total crankshaft load, and whenever this doesn’t happen, the piston in that cylinder doesn’t do its share of the work and the crankshaft slows down just a bit – that’s called a “misfire” because no combustion event took place and the now deadbeat piston robbed power from the [engine](https://www.carparts.com/blog/car-engine-parts/) rather than providing it. ELI5 Think of the engine like a drum circle, with each piston being a drummer. Each drummer waits for their turn, then gets a signal, like a spark, to hit their drum at just the right moment. That hit makes a big sound (like the explosion in the engine) that keeps the rhythm going strong. When all the drummers play in time, the beat / engine runs smoothly. But if one drummer misses their cue and stays quiet, the rhythm stumbles. That’s a misfire — one part didn’t play, and the whole song feels off. The engine, like the drum circle, needs everyone working together to stay strong and steady. Not everyone is an auto repair expert. **ELI5 (“Explain Like I’m Five”)** provides layperson-friendly explanations of complex automotive concepts, systems, & parts, so you can fully understand their importance. Great for casual car owners and DIY beginners! Powered by AI. ## What are the Common Symptoms of the P0301 Code? How can you tell if you’re dealing with a P0301? Even before you use an [OBD-II scanner](https://www.carparts.com/scan-tool/) to check for trouble codes, there are a number of signs you can keep an eye out for that can alert you to the possibility of a P0301 or any similar error codes. Here are some of the symptoms associated with a P0301: * Rough idling * Hard starting * Car jerks from time to time, either while running or while idling * Lack of power at acceleration * [Decreased fuel economy](https://www.carparts.com/blog/15-fuel-economy-hacks-that-can-save-you-money-at-the-pump) * [Check Engine Light](https://www.carparts.com/blog/check-engine-light-flashing/) ## How to Diagnose the P0301Code It can be difficult to diagnose and pinpoint the exact cause of most OBD-II codes due to the fact that they often have numerous possible causes. This is the same for code P0301. [See also  How to Replace a Faulty Crankshaft Position Sensor](https://www.carparts.com/blog/how-to-replace-faulty-crankshaft-position-sensor/) To help you troubleshoot the code, check out the videos below: The OBD-II port is where the scanner must plug to get car P codes. You can usually find it under the steering wheel column. Other locations for the port include the dashboard, center control, and glove box. ## How to Fix the P0301 Code Unfortunately, there is no “magic bullet” fix for code P0301. This is due to the fact that there are a variety of possible causes, and there are different ways to fix the issue depending on the exact cause. In most cases, you will have to replace the faulty part(s) that you’ve determined are related to the code, following a proper diagnosis. And remember—all vehicles are different. When troubleshooting and repairing diagnostic trouble codes, make sure to consult the factory repair information for your application. Repair manuals, such as those from Chilton, are useful, but an ALLDATA subscription is even better. ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information. ## Cylinder Number 1 Location and Firing Order **Cylinder number 1 in code P0301 would refer to the first cylinder in the firing order** as well as the forward cylinder on the crankshaft. For example, on a Ford V8, the cylinders are numbered 1 to 4 on the passenger side bank and 5-8 on the driver side bank, beginning at the front of the engine. On a Chevy or Dodge V8, the cylinders are numbered 1-3-5-7 on the driver side bank and 2-4-6-8 on the passenger side bank. Six cylinder V engines can either be numbered 1-2-3 on the front bank and 4-5-6 on the rear bank or vice versa, or they may have odd numbered cylinders on one bank and even numbered cylinders on the other. This varies from one V6 engine to another, so **make sure you know where cylinder number 1 is located before beginning your work**. Six and four cylinder inline engines are numbered 1-2-3-4 or 1-2-3-4-5-6 beginning on the [timing belt](https://www.carparts.com/blog/timing-belt/) end of the engine. Note that the **firing order** of the cylinders usually doesn’t follow the cylinder numbers in sequence, although there are some V6 engines that have a 1-2-3-4-5-6 firing order. Four cylinder engines usually fire 1-3-4-2, but V8 firing orders vary tremendously, sometimes even on the same vehicle make. > Note that the firing order of the cylinders usually doesn’t follow the cylinder numbers in sequence, although there are some V6 engines that have a 1-2-3-4-5-6 firing order. Four cylinder engines usually fire 1-3-4-2, but V8 firing orders vary tremendously, sometimes even on the same vehicle make. > > –[Richard McCuistian, ASE Certified Master Automobile Technician](https://www.carparts.com/blog/author/richardmccuistian/) To learn more about how the engine computer knows which cylinder is misfiring, read our in-depth explanation [here](https://www.carparts.com/blog/p0300-code-random-or-multiple-cylinder-misfire-detected/#An_In-Depth_Look_at_Cylinder_Misfires). [See also  A Short Course on Cooling Systems](https://www.carparts.com/blog/a-short-course-on-cooling-systems/) ## Other Notes About Code P0301 Is it safe to drive with the P0301 code? Not necessarily. A misfire can cause additional damage to your vehicle, so you shouldn’t continue driving with a code P0301 set. You should address the issue immediately. ## Where to Get New Spark Plugs for Your Car Driving with a P0301 code due to faulty spark plugs may lead to issues with the engine’s catalytic converter, so why not get durable replacements as soon as possible? Not only will you save your vehicle, but you’ll also save money, especially if you shop at CarParts.com. Here at [CarParts.com](https://carparts.com/), we offer spark plugs that come with a low-price guarantee to give you more bang for your buck. We also guarantee fast and reliable shipping, thanks to our strategically located warehouses across the country. We’re confident you’ll find the right spark plug for your car, truck, or SUV in minutes when you use our vehicle selector and filters. Find exactly what you need and check out securely without leaving the comfort of your home with just a few clicks. But if you aren’t satisfied with your new spark plugs, we accept returns within 60 days of the purchase with a money-back guarantee! So why wait until your vehicle’s [spark plugs](https://www.carparts.com/spark-plug) are worn-out? Shop for affordable and high-quality replacements today. ## Products Mentioned in this Guide [**Fuel Injector**](https://www.carparts.com/fuel-injector) [**Spark Plug**](https://www.carparts.com/spark-plug) [**Cylinder Head Gasket**](https://www.carparts.com/cylinder-head-gasket) ### Keep Reading: Related Posts * [P0305 Code: Cylinder 5 Misfire Detected](https://www.carparts.com/blog/p0305-code-cylinder-5-misfire-detected/) * [P0306 Code: Cylinder 6 Misfire Detected](https://www.carparts.com/blog/p0306-code-cylinder-6-misfire-detected/) * [P0302 Code: Cylinder 2 Misfire Detected](https://www.carparts.com/blog/p0302-code-cylinder-2-misfire-detected/) * [P0307 Code: Cylinder #7 Misfire Detected](https://www.carparts.com/blog/p0307-code-cylinder-7-misfire-detected/) * [P0303 Code: Cylinder 3 Misfire Detected](https://www.carparts.com/blog/p0303-code-cylinder-3-misfire-detected/) * [P0308 Code: Cylinder 8 Misfire Detected](https://www.carparts.com/blog/p0308-code-cylinder-8-misfire-detected/) **About The Authors** Written By [CarParts.com Research Team](https://www.carparts.com/blog/author/thecpteam/) Automotive and Tech Writers The CarParts.com 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 CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust. Reviewed By [Richard McCuistian](https://www.carparts.com/blog/author/richardmccuistian/) Technical Reviewer at CarParts.com 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. ### Keep Reading: Related Posts * [P0305 Code: Cylinder 5 Misfire Detected](https://www.carparts.com/blog/p0305-code-cylinder-5-misfire-detected/) * [P0306 Code: Cylinder 6 Misfire Detected](https://www.carparts.com/blog/p0306-code-cylinder-6-misfire-detected/) * [P0302 Code: Cylinder 2 Misfire Detected](https://www.carparts.com/blog/p0302-code-cylinder-2-misfire-detected/) * [P0307 Code: Cylinder #7 Misfire Detected](https://www.carparts.com/blog/p0307-code-cylinder-7-misfire-detected/) * [P0303 Code: Cylinder 3 Misfire Detected](https://www.carparts.com/blog/p0303-code-cylinder-3-misfire-detected/) * [P0308 Code: Cylinder 8 Misfire Detected](https://www.carparts.com/blog/p0308-code-cylinder-8-misfire-detected/) File Under : [OBD-II Trouble Codes](https://www.carparts.com/blog/auto-repair/obd-ii-trouble-codes/) Tagged With : [Car Engine All Articles](https://www.carparts.com/blog/tag/car-engine-all-articles/) , [cylinder-head-gasket](https://www.carparts.com/blog/tag/cylinder-head-gasket-2/) , [fuel-injector](https://www.carparts.com/blog/tag/fuel-injector-2/) , [spark-plug](https://www.carparts.com/blog/tag/spark-plug-2/) Subscribe 0 Comments Oldest Newest Most Voted Inline Feedbacks View all comments **Recommended** [Automotive World](https://www.carparts.com/blog/heres-the-latest-breakthrough-ev-tech-you-should-know-about/) September 22, 2025 [Here’s the Latest Breakthrough EV Tech You Should Know About](https://www.carparts.com/blog/heres-the-latest-breakthrough-ev-tech-you-should-know-about/) [Lifestyle](https://www.carparts.com/blog/european-cars-in-america-and-how-they-impact-american-culture/) September 22, 2025 [European Cars In America and How They Impact American Culture](https://www.carparts.com/blog/european-cars-in-america-and-how-they-impact-american-culture/) [Lifestyle](https://www.carparts.com/blog/can-i-bring-my-own-parts-to-a-mechanic-to-save-on-auto-repair/) August 29, 2025 [Can I Bring My Own Parts to a Mechanic to Save on Auto Repair?](https://www.carparts.com/blog/can-i-bring-my-own-parts-to-a-mechanic-to-save-on-auto-repair/) [Car Body](https://www.carparts.com/blog/the-best-hood-latch-brands-secure-and-affordable-replacements-for-your-car-quickref/) July 30, 2025 [The Best Hood Latch Brands: Secure and Affordable Replacements for Your Car](https://www.carparts.com/blog/the-best-hood-latch-brands-secure-and-affordable-replacements-for-your-car-quickref/) [Features](https://www.carparts.com/blog/whats-the-best-way-to-sell-your-car/) July 14, 2025 [What’s the Best Way To Sell Your Car?](https://www.carparts.com/blog/whats-the-best-way-to-sell-your-car/) [Driving](https://www.carparts.com/blog/automatic-lights-101-how-to-turn-your-headlights-off-while-the-car-is-running/) July 4, 2025 [Automatic Lights 101: How to Turn Your Headlights Off While the Car Is Running](https://www.carparts.com/blog/automatic-lights-101-how-to-turn-your-headlights-off-while-the-car-is-running/) ## [For The Car Owner](/blog/for-the-car-owner/) 1. 1 [Bottle Jack vs Floor Jack: What’s the Difference?](https://www.carparts.com/blog/bottle-jack-vs-floor-jack-whats-the-difference/) 2. 2 [Handy Tools and Tips for a DIY Oil Change](https://www.carparts.com/blog/handy-tools-and-tips-for-a-diy-oil-change/) 3. 3 [What’s the Right Lubricant For Your Car’s Hinges and Locks?](https://www.carparts.com/blog/whats-the-right-lubricant-for-your-cars-hinges-and-locks/) 4. 4 [Is It Safe to Use a Pressure Washer on My Car? 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