{"id":45919,"date":"2021-11-11T00:42:24","date_gmt":"2021-11-11T08:42:24","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=45919"},"modified":"2026-02-10T18:07:18","modified_gmt":"2026-02-11T02:07:18","slug":"p0203-code-injector-circuit-open-cylinder-3","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0203-code-injector-circuit-open-cylinder-3\/","title":{"rendered":"P0203 Code: Injector Circuit \/ Open &#8211; Cylinder 3"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column45919_17a3a8-44 > .kt-inside-inner-col,.kadence-column45919_17a3a8-44 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column45919_17a3a8-44 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column45919_17a3a8-44 > .kt-inside-inner-col{flex-direction:column;}.kadence-column45919_17a3a8-44 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column45919_17a3a8-44 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column45919_17a3a8-44{position:relative;}@media all and (max-width: 1024px){.kadence-column45919_17a3a8-44 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column45919_17a3a8-44 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column45919_17a3a8-44 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-632d04  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-c691c4\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading45919_b5bdde-71, .wp-block-kadence-advancedheading.kt-adv-heading45919_b5bdde-71[data-kb-block=\"kb-adv-heading45919_b5bdde-71\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading45919_b5bdde-71 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading45919_b5bdde-71[data-kb-block=\"kb-adv-heading45919_b5bdde-71\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading45919_b5bdde-71 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading45919_b5bdde-71[data-kb-block=\"kb-adv-heading45919_b5bdde-71\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading45919_b5bdde-71 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading45919_b5bdde-71\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DTC P0203 stands for &ldquo;Injector Circuit\/Open &ndash; Cylinder 3.&rdquo; It&rsquo;s logged when the PCM detects an issue with the fuel injector or its wiring.<\/li>\n\n\n\n<li>A logged P0203 can cause your vehicle to exhibit symptoms, such as an illuminated check engine light, decreased engine performance, and increased fuel consumption.<\/li>\n\n\n\n<li>Problems that could trigger this code include Fuel injector 3 damage or failure, wiring issues, and PCM failure.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Say you&rsquo;re using your OBD-II scan tool to check your vehicle and the P0203 code appears. What does it signify? This guide will help you learn more about what the P0203 code means, as well as its possible causes and common symptoms, so that you can troubleshoot it as soon as possible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0203 Code Mean?<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Diagnostic trouble code\">Diagnostic trouble code<\/a> (DTC) P0203 stands for &ldquo;Injector Circuit\/Open &ndash; Cylinder 3.&rdquo; The powertrain control module (PCM) may set this code if it has detected a potential error in the injector or the injector wiring. It may also register this code if it can&rsquo;t control the fuel injector.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"860\" height=\"811\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-fuel-injector-wiring-diagram.png\" alt=\"car fuel injector wiring diagram\" class=\"wp-image-75967\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-fuel-injector-wiring-diagram.png 860w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-fuel-injector-wiring-diagram-300x283.png 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-fuel-injector-wiring-diagram-768x724.png 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-fuel-injector-wiring-diagram-150x141.png 150w\" sizes=\"(max-width: 860px) 100vw, 860px\"><figcaption class=\"wp-element-caption\">Fuel injector wiring diagram | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>For example, when the injector on an MPI unit is grounded, the injector pintle raises off its seat, and fuel flows during that very brief instant (1-5 milliseconds). When the ground to the injector coil is released, the pintle spring snaps it back against its seat, fuel flow stops, and the collapsing magnetic field induces a spike of about 50 volts that travels back toward the ECM\/PCM on that ground trigger circuit, which is designed to handle those voltage spikes.<\/p>\n\n\n\n<p>The PCM is equipped with special transistors called &ldquo;drivers&rdquo; that switch the engine&rsquo;s <a href=\"https:\/\/www.carparts.com\/fuel-injector\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel injectors\">fuel injectors<\/a> on and off. When an injector is switched on or off, the PCM expects the voltage and resistance to stay within a certain range.<\/p>\n\n\n\n<p>Or, if it doesn&rsquo;t sense 12 volts on the trigger side of the injector (coming through the injector coil from the opposite side), it can use that information to store the P0203 code. It varies from OEM to OEM. Likewise, if the PCM detects that the voltage and the resistance do not fall within the expected values, the P0203 code is set.<\/p>\n\n\n\n<p>You can find more useful information in our technical discussion about fuel injection systems.<\/p>\n\n\n\n<p><strong><em>Note<\/em><\/strong><em>: The definition of code P0203 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0203 Code?<\/h2>\n\n\n\n<p>Like all OBD-II codes, the P0203 error code has several possible causes. These include:<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fuel injector 3 damage or failure<\/li>\n\n\n\n<li>Wiring issues (e.g., fuel injector 3 control circuit is open, shorted to ground, or shorted to voltage)<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM failure\">PCM failure<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0203 Code?<\/h2>\n\n\n\n<p>Below are some of the most common symptoms of the P0203 code:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Check engine light\">Check engine light<\/a> or malfunction indicator lamp (MIL) illuminated<\/li>\n\n\n\n<li>Decreased <a href=\"https:\/\/www.carparts.com\/blog\/car-engine-parts\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine\">engine<\/a> performance such as misfires, rough running engine, and <a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-accelerate-properly-when-i-push-the-gas-causes\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"poor acceleration\">poor acceleration<\/a><\/li>\n\n\n\n<li>Increased fuel consumption<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0203 Code<\/h2>\n\n\n\n<p>Diagnosing error codes like the P0203 is challenging because you need to narrow down the root cause from a list of possible causes. As such, you may need help from a seasoned mechanic or technician to find out what triggered this code in your vehicle.<\/p>\n\n\n\n<p>If you want to know more about this code, there are a few resources that explain this code&rsquo;s diagnostic process in more detail.<\/p>\n\n\n\n<p>Below is a video that illustrates how the P0203 error code might be diagnosed:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Fuel Injector Testing Hack P0201 P0202  P0203 P0204 P0302\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Wmo0TPBH99I?start=41&amp;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0203 Code<\/h2>\n\n\n\n<p>Many diagnostic trouble codes share the same symptoms, possible causes, and areas of concern. This is why they don&rsquo;t have a single cure-all solution. Before you can even fix the P0203 code, you need to determine the exact root cause and the prescribed repair procedure for your specific vehicle.<\/p>\n\n\n\n<p>Luckily, there are <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manuals and repair databases\">repair manuals and repair databases<\/a> to help you figure out what needs to be done. One of the most reliable sources is a vehicle-specific repair manual, which is written for your vehicle&rsquo;s exact make and model. A repair manual also contains detailed repair information, as well as illustrations and diagrams to help you better understand the issue.<\/p>\n\n\n\n<p>If you don&rsquo;t have a lot of experience diagnosing or fixing trouble codes, it&rsquo;s best to leave the work to a professional mechanic, so that you can avoid problems and more expensive repairs down the line.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Notes About P0203<\/h2>\n\n\n\n<p>The P0203 code is considered severe. Driving while your vehicle has triggered this code without having it repaired is highly discouraged. If you encounter this code, we recommend taking your vehicle to a nearby repair shop for diagnosis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get Top-Notch Fuel Injectors to Clear Code P0203<\/h2>\n\n\n\n<p>Don&rsquo;t let your vehicle hang out in the garage for days because of the issues caused by the P0203 code. If a malfunctioning <a href=\"https:\/\/www.carparts.com\/fuel-injector\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel injector\">fuel injector<\/a> is the culprit, don&rsquo;t put off replacing it. For a wide selection of high-quality fuel injectors to choose from, look no further than <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>To start shopping, visit our website and fill out our vehicle selector to narrow down your search to compatible fuel injectors. Then, use the search filters to view the ones that match your preferred brand, price range, and more.<\/p>\n\n\n\n<p>If you need your replacement part as soon as possible, we have you covered. We have distribution centers strategically located across the country to ensure fast and efficient shipping. We also have a 24\/7 customer service team ready to assist you anytime if you have questions about your order or our products.<\/p>\n\n\n\n<p>All our parts passed stringent quality control tests, so you can be sure that they function just like your factory unit. They also come at unbeatable prices to help you get the best value for your money.<\/p>\n\n\n\n<p>Take a look at our selection of fuel injectors now and order what you need today!<\/p>\n\n\n\n<div class=\"shop-project\">\n\n    <h2>Shop this Project<\/h2>\n\n    <ul class=\"shop-project-list\">\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/repf314302\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repf314302_1\" alt=\"Replacement &ndash; Fuel Injector, with Red Connector\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repf314302_1\" alt=\"Replacement &ndash; Fuel Injector, with Red Connector\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/repf314302\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Replacement &ndash; Fuel Injector, with Red Connector\">Replacement &ndash; Fuel Injector, with Red Connector<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$22.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/repf314302\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/rd31430003\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/rd31430003_1\" alt=\"Replacement &ndash; Fuel Injector, Blade Type, 2-Prong Male Terminal, Includes O-Ring\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/rd31430003_1\" alt=\"Replacement &ndash; Fuel Injector, Blade Type, 2-Prong Male Terminal, Includes O-Ring\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/rd31430003\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Replacement &ndash; Fuel Injector, Blade Type, 2-Prong Male Terminal, Includes O-Ring\">Replacement &ndash; Fuel Injector, Blade Type, 2-Prong Male Terminal, Includes O-Ring<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$16.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/rd31430003\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/repf314301\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repf314301_1\" alt=\"Replacement &ndash; Fuel Injector &ndash; New, Sold individually\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repf314301_1\" alt=\"Replacement &ndash; Fuel Injector &ndash; New, Sold individually\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/repf314301\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Replacement &ndash; Fuel Injector &ndash; New, Sold individually\">Replacement &ndash; Fuel Injector &ndash; New, Sold individually<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$27.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/fuel-injector\/replacement\/repf314301\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n            <\/ul>\n<\/div>\n\n\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Say you&rsquo;re using your OBD-II scan tool to check your vehicle and the P0203 code appears. What does it signify?&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0203-code-injector-circuit-open-cylinder-3\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":45933,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[1314],"tags":[3354,1185],"ppma_author":[2607,2985],"class_list":{"0":"post-45919","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-car-engine-all-articles","9":"tag-fuel-injector-2","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0203 Code: Injector Circuit \/ Open - Cylinder 3 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"First time encountering the P0203 trouble code? 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