{"id":80742,"date":"2023-02-01T23:37:38","date_gmt":"2023-02-02T07:37:38","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=80742"},"modified":"2025-03-24T18:12:21","modified_gmt":"2025-03-25T01:12:21","slug":"p2bac-code-nox-exceedance-deactivation-of-egr","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2bac-code-nox-exceedance-deactivation-of-egr\/","title":{"rendered":"P2BAC Code: NOx Exceedance &#8211; Deactivation of EGR"},"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-column80742_59576e-e9 > .kt-inside-inner-col,.kadence-column80742_59576e-e9 > .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-column80742_59576e-e9 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column80742_59576e-e9 > .kt-inside-inner-col{flex-direction:column;}.kadence-column80742_59576e-e9 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column80742_59576e-e9 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column80742_59576e-e9{position:relative;}@media all and (max-width: 1024px){.kadence-column80742_59576e-e9 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column80742_59576e-e9 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column80742_59576e-e9 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-405e39  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-975115\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading80742_053038-89, .wp-block-kadence-advancedheading.kt-adv-heading80742_053038-89[data-kb-block=\"kb-adv-heading80742_053038-89\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading80742_053038-89 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading80742_053038-89[data-kb-block=\"kb-adv-heading80742_053038-89\"] 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-heading80742_053038-89 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading80742_053038-89[data-kb-block=\"kb-adv-heading80742_053038-89\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading80742_053038-89 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading80742_053038-89\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Code P2BAC indicates &ldquo;NOx Exceedance &ndash; Deactivation of EGR.&rdquo; It&rsquo;s typically set if the level of NOx indicates the EGR isn&rsquo;t working properly.<\/strong><\/li>\n\n\n\n<li>NOx is a dangerous gas because it&rsquo;s toxic, and if a vehicle produces too much of it, there might be something wrong with its exhaust gas regulation (EGR) valve.<\/li>\n\n\n\n<li>If a vehicle logs code P2BAC, replacing the EGR valve can fix the problem.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Did your OBD2 scanner register a P2BAC code? Here&rsquo;s what it means, its usual causes and symptoms, as well as the best way to approach the issue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2BAC Code Mean?<\/h2>\n\n\n\n<p>The <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) P2BAC indicates &ldquo;NOx Exceedance &ndash; Deactivation of EGR.&rdquo; Since the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ECM\">ECM<\/a> can monitor NOx as a rationality check, the ECM will typically set this code if the level of NOx indicates the EGR isn&rsquo;t working properly. But the ECM can&rsquo;t determine what the issue is from NOx measurement alone. Typically other codes will be present along with the P2BAC code and should be addressed first.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code-1024x683.jpg\" alt=\"mechanic encounters p2bac obd code\" class=\"wp-image-80746\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code-1536x1025.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-encounters-p2bac-obd-code.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The diagnostic trouble code (DTC) P2BAC indicates &ldquo;NOx Exceedance &ndash; Deactivation of EGR.&rdquo;<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Note About NOx<\/h3>\n\n\n\n<p>NOx is toxic, so the exhaust gas recirculation (EGR) system was designed to mostly prevent it from forming in the first place, although even on gas burners, a <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a> is mounted near the engine to handle the remaining NOx that forms despite EGR.<\/p>\n\n\n\n<p>On modern diesel engines, there is a selective catalyst reduction (SCR) converter that takes care of NOx, but on diesels, a compound called diesel exhaust fluid must be injected for the SCR catalyst on these diesels to work.<\/p>\n\n\n\n<p>To satisfy various OBD requirements, selective catalyst reduction systems will typically use a NOx sensor downstream of the SCR catalyst. If excessive NOx or ammonia concentrations exist downstream of the SCR, an OBD malfunction will be triggered, as many NOx sensors are sensitive to both NOx and ammonia (from the DEF).<\/p>\n\n\n\n<p>Depending on the <a href=\"https:\/\/dieselnet.com\/tech\/cat_scr_diesel_control.php\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"SCR control\">SCR control<\/a> strategy, another NOx sensor may be installed in front of the SCR catalytic converter to determine the conversion rate of the SCR catalyst.<\/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<p>You can learn more about NOx in our technical discussion about the <a href=\"https:\/\/www.carparts.com\/blog\/p0401-code-exhaust-gas-recirculation-egr-flow-insufficient-detected\/#An_In-Depth_Look_at_the_EGR_System\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR system\">EGR system<\/a>.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P2BAC can differ according to the vehicle manufacturer. Check 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 P2BAC Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Critical engine performance codes are set<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of P2BAC Code?<\/h2>\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=\"Illuminated check engine light\">Illuminated check engine light<\/a><\/li>\n\n\n\n<li>Additional engine performance problems related to the other stored DTCs<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2BAC Code<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic-1024x682.jpg\" alt=\"mechanic discovers p2bac code on diagnostic\" class=\"wp-image-80745\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-discovers-p2bac-code-on-diagnostic.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The P2BAC code is a generic powertrain code that applies to various makes and models.<\/figcaption><\/figure>\n\n\n\n<p>The P2BAC code is a generic powertrain code that applies to various makes and models. Since it can have several causes and can come with other codes, troubleshooting it yourself is not the best option. It&rsquo;s best to leave the job to professionals to make sure the problem is diagnosed and fixed properly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P2BAC Code<\/h2>\n\n\n\n<p>For DIYers with advanced technical knowledge and hands-on experience who prefer to test and replace their vehicle&rsquo;s EGR on their own, it will be helpful to rely on the appropriate <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or refer to an online repair database\">repair manual or refer to an online repair database<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Can You Drive with a P2BAC Code?<\/h2>\n\n\n\n<p>Though you can technically drive a vehicle that has logged a P2BAC code, it&rsquo;s not recommended to do so. Many complications can happen with inoperative EGR systems.<\/p>\n\n\n\n<p>For example, you might have to contend with decreased fuel efficiency, increased emissions, and rough idling. If these problems persist for too long, your engine might sustain damage and even fail to start.<\/p>\n\n\n\n<p><\/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>Did your OBD2 scanner register a P2BAC code? Here&rsquo;s what it means, its usual causes and symptoms, as well as&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2bac-code-nox-exceedance-deactivation-of-egr\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":80744,"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":[],"ppma_author":[2607,2985],"class_list":{"0":"post-80742","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P2BAC Code: NOx Exceedance - Deactivation of EGR - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what a P2BAC code means, the possible causes, and the common symptoms associated with this code.\" \/>\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\/p2bac-code-nox-exceedance-deactivation-of-egr\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2BAC Code: NOx Exceedance - Deactivation of EGR - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what a P2BAC code means, the possible causes, and the common symptoms associated with this code.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p2bac-code-nox-exceedance-deactivation-of-egr\/\" \/>\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=\"2023-02-02T07:37:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-25T01:12:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/mechanic-diagnosing-p2bac-code.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1334\" \/>\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\\\/p2bac-code-nox-exceedance-deactivation-of-egr\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2bac-code-nox-exceedance-deactivation-of-egr\\\/\"},\"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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