{"id":77161,"date":"2022-11-01T19:49:44","date_gmt":"2022-11-02T02:49:44","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=77161"},"modified":"2023-09-15T01:39:44","modified_gmt":"2023-09-15T08:39:44","slug":"p20bd-code-reductant-heater-b-control-circuit-open","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p20bd-code-reductant-heater-b-control-circuit-open\/","title":{"rendered":"P20BD Code: Reductant Heater \u201cB\u201d Control Circuit\/Open"},"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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_736c8e-c8 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_736c8e-c8 > .kt-inside-inner-col,.kadence-column_736c8e-c8 > .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-column_736c8e-c8 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_736c8e-c8 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_736c8e-c8 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_736c8e-c8 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_736c8e-c8{position:relative;}@media all and (max-width: 1024px){.kadence-column_736c8e-c8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_736c8e-c8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_736c8e-c8 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-e4a605  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-f8323e\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_03a44d-2d, .wp-block-kadence-advancedheading.kt-adv-heading_03a44d-2d[data-kb-block=\"kb-adv-heading_03a44d-2d\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_03a44d-2d mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_03a44d-2d[data-kb-block=\"kb-adv-heading_03a44d-2d\"] 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-heading_03a44d-2d img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_03a44d-2d[data-kb-block=\"kb-adv-heading_03a44d-2d\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_03a44d-2d summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_03a44d-2d\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Diagnostic trouble code (DTC) P20BD stands for &ldquo;Reductant Heater &lsquo;B&rsquo; Control Circuit\/Open.&rdquo;<\/li><li>The P20BD code can be logged because of a reductant tank heater failure, a bad glow plug control module, a defective reductant temperature sensor, or a PCM programming error.<\/li><li>Common symptoms associated with this code: illuminated check engine light, failed DPF regeneration, poor fuel economy, and reduced engine performance.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Diesel engines use the selective catalytic reduction method to reduce NOx emissions. This method is done by injecting <a href=\"https:\/\/www.carparts.com\/diesel-exhaust-fluid\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"diesel exhaust fluid\">diesel exhaust fluid<\/a> (DEF) into the exhaust stream, triggering a chemical reaction that breaks down NOx into nitrogen and hydrogen. The DEF is stored in a tank where it&rsquo;s kept warm by a reductant heater. If the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> notices that the DEF heater isn&rsquo;t operating as it should, on-board diagnostics will log a P20BD code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P20BD 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) P20BD stands for &ldquo;Reductant Heater &lsquo;B&rsquo; Control Circuit\/Open.&rdquo;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container-1024x682.jpg\" alt=\"driver pouring diesel exhaust fluid from a container\" class=\"wp-image-77162\" width=\"1024\" height=\"682\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-pouring-diesel-exhaust-fluid-from-a-container.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The DEF is kept inside a tank or reductant injector supply hose where a heater keeps it warm to prevent the fluid from freezing or crystallizing under extremely cold temperatures.<\/figcaption><\/figure>\n\n\n\n<p>DEF is a colorless, odorless, and non-toxic nitrogen fertilizer that&rsquo;s injected into the catalyst, converting leftover exhaust particles into harmless gases.<\/p>\n\n\n\n<p>The DEF is kept inside a tank or reductant injector supply hose where a heater keeps it warm to prevent the fluid from freezing or crystallizing under extremely cold temperatures.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P20BD might 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 Common Causes of the P20BD Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Reductant tank heater failure<\/li><li>Wiring issues<\/li><li>Glow plug control module failure<\/li><li>Defective reductant temperature sensor<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM programming error\">PCM programming error<\/a><\/li><\/ul>\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<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P20BD Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Illuminated check engine light\">Illuminated check engine light<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/diesel-particulate-filter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Diesel particulate filter\">Diesel particulate filter<\/a> (DPF) regeneration might not occur<\/li><li>Poor fuel economy<\/li><li>Diminished engine performance<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P20BD Code<\/h2>\n\n\n\n<p>Vehicles equipped with an OBD-II system can register a P20BD code. However, keep in mind that the diagnostic process for this code can vary depending on vehicle specifications. Factors like the vehicle&rsquo;s year, make, and model can alter the steps for diagnosing the P20BD code.<\/p>\n\n\n\n<p>Diagnosing a DTC P20BD might require you to use a scan tool and check the affected system for any sign of damage. If you&rsquo;re not familiar with how the process works, you can always take your vehicle to a repair shop and have trained professionals do the job for you. But if you think you&rsquo;ll be fine on your own, then you can go ahead and proceed with the diagnostic process.<\/p>\n\n\n\n<p>Here&rsquo;s a short video you might want to check out to get an idea of what the process might involve.<\/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=\"Ford Diesel: P20BD - DEF Reductant Heater B Control Circuit\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/kcU-IywZ33Y?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 P20BD Code<\/h2>\n\n\n\n<p>Attempting to fix a P20BD code can be frustrating and confusing without the right tools and technical information. If done incorrectly, your vehicle could even develop more problems. Under these circumstances, it&rsquo;s best to have a certified mechanic do the job for you to ensure that all steps and protocols are followed correctly.<\/p>\n\n\n\n<p>But if you&rsquo;ve had your fair share of resolving DTCs before, then you&rsquo;re well aware that there&rsquo;s no magic bullet that will fix all codes for all makes and models. So before you begin, make sure to gather vehicle-specific repair information from guides like Chilton or an ALLDATA subscription.<\/p>\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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Diesel engines use the selective catalytic reduction method to reduce NOx emissions. This method is done by injecting diesel exhaust&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p20bd-code-reductant-heater-b-control-circuit-open\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":77163,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_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":[3540,2118,1323],"ppma_author":[2607,2855],"class_list":{"0":"post-77161","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-diesel-exhaust-fluid","9":"tag-diesel-particulate-filter","10":"tag-engine-control-module-2","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P20BD Code: Reductant Heater \u201cB\u201d Control Circuit\/Open - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn about the P20BD code, its most common causes, and the symptoms associated with it.\" \/>\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.carparts.com\/blog\/p20bd-code-reductant-heater-b-control-circuit-open\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P20BD Code: Reductant Heater \u201cB\u201d Control Circuit\/Open - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn about the P20BD code, its most common causes, and the symptoms associated with it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p20bd-code-reductant-heater-b-control-circuit-open\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-02T02:49:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-15T08:39:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/man-removing-cap-to-pour-diesel-exhaust-fluid.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1333\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p20bd-code-reductant-heater-b-control-circuit-open\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p20bd-code-reductant-heater-b-control-circuit-open\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"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. 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