{"id":79385,"date":"2025-06-18T13:00:57","date_gmt":"2025-06-18T18:00:57","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=79385"},"modified":"2025-06-18T13:13:52","modified_gmt":"2025-06-18T18:13:52","slug":"p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high","title":{"rendered":"P20DA OBD2: Exhaust Aftertreatment Fuel Supply Control Circuit High"},"content":{"rendered":"<h2><strong>What Does the P20DA Code Mean?<\/strong><\/h2>\n<p>The P20DA code indicates an issue with the Exhaust Aftertreatment Fuel Supply Control Circuit, specifically reporting that the circuit is experiencing a high signal. This generally points to problems related to the Diesel Exhaust Fluid (DEF) system, which is crucial for reducing emissions in diesel engines.<\/p>\n<h2>What Causes the P20DA Code?<\/h2>\n<p>This code is often triggered by issues with the DEF system. The most common causes include:<\/p>\n<ul>\n<li>DEF pump failure<\/li>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Wiring issues related to the DEF system<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P20DA Code?<\/h2>\n<p>When the P20DA code is present, you may notice several symptoms, including:<\/p>\n<ul>\n<li>DPF (Diesel Particulate Filter) regeneration may not occur<\/li>\n<li>Check Engine Light illuminated<\/li>\n<li>Decreased engine performance<\/li>\n<\/ul>\n<h2>How Serious Is the P20DA Code?<\/h2>\n<p>The P20DA code is classified as moderate severity. While it may not pose an immediate threat to the vehicle&#8217;s safety, it is crucial to address it promptly to prevent further complications and ensure the proper function of the exhaust system.<\/p>\n<h2>How to Diagnose the P20DA Code<\/h2>\n<p>A proper diagnosis of the P20DA code involves several steps:<\/p>\n<ul>\n<li>Use an OBD-II scanner to confirm the P20DA code and check for any related codes.<\/li>\n<li>Inspect the DEF pump and wiring for any visible damage or faults.<\/li>\n<li>Test the DEF pump operation to ensure it is functioning correctly.<\/li>\n<li>Check the Powertrain Control Module (PCM) for any faults.<\/li>\n<\/ul>\n<h2>Common Repairs for the P20DA Code<\/h2>\n<p>Repairs for the P20DA code may include:<\/p>\n<ul>\n<li>Replacing a faulty DEF pump<\/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 P20DA Code?<\/h2>\n<p>The cost to repair the P20DA code can vary widely depending on the specific issue. Typical repairs may range from $100 to $1,500, depending on whether you need to replace the DEF pump, repair wiring, or address PCM issues.<\/p>\n<h2>Can I Fix the P20DA Code Myself?<\/h2>\n<p>While some owners may be able to diagnose simple wiring issues or replace the DEF pump themselves, it is often recommended to consult a professional mechanic. The DEF system is complex, and improper repairs can lead to further problems.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Does the P20DA Code Mean? The P20DA code indicates an issue with the Exhaust Aftertreatment Fuel Supply Control Circuit, specifically reporting that the circuit is experiencing a high signal. This generally points to problems related to the Diesel Exhaust Fluid (DEF) system, which is crucial for reducing emissions in diesel engines. What Causes the &hellip;<\/p>\n","protected":false},"author":26,"featured_media":88985,"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-79385","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 v28.3 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P20DA \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P20DA code, what causes exhaust aftertreatment fuel supply 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\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P20DA OBD2: Exhaust Aftertreatment Fuel Supply Control Circuit High\" \/>\n<meta property=\"og:description\" content=\"What Does the P20DA Code Mean? The P20DA code indicates an issue with the Exhaust Aftertreatment Fuel Supply Control Circuit, specifically reporting that\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p20da-obd2-exhaust-aftertreatment-fuel-supply-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=\"2025-06-18T18:00:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-18T18:13:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-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\" 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He's worked across dealerships, owned and operated his own independent garage, and consulted on automotive trade school curricula, reviewing technical textbooks used in vocational programs. He now serves as Editor-in-Chief at eManualOnline.com, where he oversees the platform's technical content. He's one of the few voices in automotive publishing who has actually turned wrenches professionally on the vehicles he covers. He didn't learn automotive repair to write about it. 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\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-control-circuit-high-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p20da-obd2-exhaust-aftertreatment-fuel-supply-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":"What Does the P20DA Code Mean? The P20DA code indicates an issue with the Exhaust Aftertreatment Fuel Supply Control Circuit, specifically reporting that the circuit is experiencing a high signal. This generally points to problems related to the Diesel Exhaust Fluid (DEF) system, which is crucial for reducing emissions in diesel engines. What Causes the&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/79385","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=79385"}],"version-history":[{"count":3,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/79385\/revisions"}],"predecessor-version":[{"id":88989,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/79385\/revisions\/88989"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/88985"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=79385"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=79385"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=79385"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}