{"id":79668,"date":"2025-06-06T13:25:35","date_gmt":"2025-06-06T18:25:35","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=79668"},"modified":"2025-06-06T13:25:35","modified_gmt":"2025-06-06T18:25:35","slug":"p2304-obd2-ignition-coil-b-primary-control-circuit-high","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p2304-obd2-ignition-coil-b-primary-control-circuit-high","title":{"rendered":"P2304 OBD2: Ignition Coil &#8220;B&#8221; Primary Control Circuit High"},"content":{"rendered":"<p>The OBD2 code P2304 indicates an issue with the ignition coil &#8220;B&#8221; primary control circuit being high. This code suggests a problem in the ignition system that could affect your vehicle\u2019s performance.<\/p>\n<h2>What Does the P2304 Code Mean?<\/h2>\n<p>The P2304 code is triggered when the Engine Control Module (PCM) detects that the ignition coil &#8220;B&#8221; primary control circuit is operating at a voltage that is higher than expected. This can result in improper ignition coil function, leading to engine performance issues.<\/p>\n<h2>What Causes the P2304 Code?<\/h2>\n<ul>\n<li>Ignition coil failure<\/li>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Wiring issues, such as damaged or corroded wires<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P2304 Code?<\/h2>\n<ul>\n<li>Decreased engine performance<\/li>\n<li>Increased fuel consumption<\/li>\n<li>Engine misfires<\/li>\n<li>Stumbling or hesitation during acceleration<\/li>\n<\/ul>\n<h2>How Serious Is the P2304 Code?<\/h2>\n<p>The P2304 code is classified as urgent. If not addressed promptly, it can lead to significant engine damage and pose safety risks for the driver and passengers. It is advisable to diagnose and repair the issue as soon as possible.<\/p>\n<h2>How to Diagnose the P2304 Code<\/h2>\n<p>To properly diagnose the P2304 code, a mechanic will typically follow these steps:<\/p>\n<ul>\n<li>Use an OBD-II scanner to confirm the P2304 code and check for any accompanying codes.<\/li>\n<li>Inspect the ignition coil and wiring for visible damage or corrosion.<\/li>\n<li>Test the ignition coil&#8217;s resistance and operation.<\/li>\n<li>Check the PCM for any faults or programming issues.<\/li>\n<\/ul>\n<h2>Common Repairs for the P2304 Code<\/h2>\n<ul>\n<li>Replacing the faulty ignition coil<\/li>\n<li>Repairing or replacing damaged wiring<\/li>\n<li>Reprogramming or replacing the PCM, if necessary<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P2304 Code?<\/h2>\n<p>The cost to repair the P2304 code can vary widely depending on the specific issue. On average, you might expect to pay between $150 and $600, depending on whether an ignition coil, wiring, or PCM needs to be replaced.<\/p>\n<h2>Can I Fix the P2304 Code Myself?<\/h2>\n<p>While some DIY enthusiasts may be able to replace an ignition coil or repair wiring, it is essential to have a proper understanding of automotive electrical systems. If you are not confident in your skills, it\u2019s best to consult a professional mechanic to avoid further complications.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The OBD2 code P2304 indicates an issue with the ignition coil &#8220;B&#8221; primary control circuit being high. This code suggests a problem in the ignition system that could affect your vehicle\u2019s performance. What Does the P2304 Code Mean? The P2304 code is triggered when the Engine Control Module (PCM) detects that the ignition coil &#8220;B&#8221; &hellip;<\/p>\n","protected":false},"author":26,"featured_media":88147,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[11987],"tags":[],"class_list":["post-79668","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-p-obd2-codes-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P2304 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P2304 code, what causes ignition coil &quot;B&quot; primary control circuit high, and how to diagnose and fix common issues to maintain optimal engine performance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.emanualonline.com\/blog\/p2304-obd2-ignition-coil-b-primary-control-circuit-high\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2304 OBD2: Ignition Coil &quot;B&quot; Primary Control Circuit High\" \/>\n<meta property=\"og:description\" content=\"The OBD2 code P2304 indicates an issue with the ignition coil &quot;B&quot; primary control circuit being high. This code suggests a problem in the ignition system\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p2304-obd2-ignition-coil-b-primary-control-circuit-high\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-06T18:25:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"JC Landry\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:site\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"JC Landry\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p2304-obd2-ignition-coil-b-primary-control-circuit-high#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p2304-obd2-ignition-coil-b-primary-control-circuit-high\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P2304 OBD2: Ignition Coil &#8220;B&#8221; 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He learned to write after spending over a decade doing it.","sameAs":["https:\/\/www.linkedin.com\/in\/jean-claude-landry-857781186\/"],"url":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"}]}},"uagb_featured_image_src":{"full":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2304-obd2-ignition-coil-b-primary-control-circuit-high-1050x525.png",1050,525,true]},"uagb_author_info":{"display_name":"JC Landry","author_link":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"},"uagb_comment_info":0,"uagb_excerpt":"The OBD2 code P2304 indicates an issue with the ignition coil &#8220;B&#8221; primary control circuit being high. This code suggests a problem in the ignition system that could affect your vehicle\u2019s performance. What Does the P2304 Code Mean? The P2304 code is triggered when the Engine Control Module (PCM) detects that the ignition coil &#8220;B&#8221;&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/79668","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/comments?post=79668"}],"version-history":[{"count":1,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/79668\/revisions"}],"predecessor-version":[{"id":86367,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/79668\/revisions\/86367"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/88147"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=79668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=79668"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=79668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}