{"id":72794,"date":"2022-09-09T00:33:40","date_gmt":"2022-09-09T07:33:40","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=72794"},"modified":"2023-08-25T03:14:22","modified_gmt":"2023-08-25T10:14:22","slug":"p2457-code-exhaust-gas-recirculation-cooling-system-performance","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2457-code-exhaust-gas-recirculation-cooling-system-performance\/","title":{"rendered":"P2457 Code: Exhaust Gas Recirculation Cooling System Performance"},"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_39ab20-f2 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_39ab20-f2 > .kt-inside-inner-col,.kadence-column_39ab20-f2 > .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_39ab20-f2 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_39ab20-f2 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_39ab20-f2 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_39ab20-f2 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_39ab20-f2{position:relative;}@media all and (max-width: 1024px){.kadence-column_39ab20-f2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_39ab20-f2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_39ab20-f2 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-ef89b6  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-5d9616\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_397299-59, .wp-block-kadence-advancedheading.kt-adv-heading_397299-59[data-kb-block=\"kb-adv-heading_397299-59\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_397299-59 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_397299-59[data-kb-block=\"kb-adv-heading_397299-59\"] 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_397299-59 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_397299-59[data-kb-block=\"kb-adv-heading_397299-59\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_397299-59 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_397299-59\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Diagnostic trouble code (DTC) P2457 stands for &ldquo;Exhaust Gas Recirculation Cooling System Performance.&rdquo; It means the powertrain control module (PCM) has detected a problem in the exhaust gas recirculation (EGR) system, which is in charge of reducing the nitrogen oxide (NOx) levels by routing inert exhaust gases back to the engine to lower combustion temperatures.<\/li><li>Common causes of the P2457 code include a blocked EGR cooler, a leak or restriction in the engine coolant system, a faulty EGR temperature sensor, and a restricted charge air cooler.<\/li><li>The symptoms that often accompany the P2457 code include an illuminated check engine light and the vehicle getting stuck in &ldquo;limp mode.&rdquo;<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The exhaust gas recirculation (EGR) system returns exhaust gasses to the engine in an effort to reduce combustion temperatures and limit the emissions of nitrogen oxides (NOx). On some diesel vehicles, the EGR system runs the exhaust through a cooler to lower combustion temperatures even further.<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> checks the temperature of the exhaust gas coming from the <a href=\"https:\/\/www.carparts.com\/egr-cooler\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR cooler\">EGR cooler<\/a>. It will log a P2457 code if the exhaust temperature does not meet the expected value.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2457 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) P2457 indicates &ldquo;Exhaust Gas Recirculation Cooling System Performance.&rdquo; It applies to certain diesel vehicles equipped with an EGR cooler.<\/p>\n\n\n\n<p>&nbsp;The EGR system is a vital part of the emission control system in some diesel-engined vehicles. It helps reduce the NOx levels by routing inert exhaust gasses back to the engine to lower combustion temperatures.<\/p>\n\n\n\n<p>A EGR cooler is sometimes used to cool the exhaust gasses before they enter the engine. The EGR cooler relies on coolant borrowed from the engine cooling system to remove heat from the gasses.<\/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\/09\/car-egr-cooler-in-white-background-1024x602.jpg\" alt=\"car egr cooler in white background\" class=\"wp-image-72798\" width=\"1024\" height=\"602\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/car-egr-cooler-in-white-background-1024x602.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/car-egr-cooler-in-white-background-300x176.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/car-egr-cooler-in-white-background-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/car-egr-cooler-in-white-background-1536x904.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/car-egr-cooler-in-white-background-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/car-egr-cooler-in-white-background.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The P2457 code applies to certain diesel vehicles equipped with an EGR cooler.<\/figcaption><\/figure>\n\n\n\n<p>As the gasses pass through the EGR cooler, the heat they carry gets absorbed by the coolant. The fluid goes to the <a href=\"https:\/\/www.carparts.com\/radiator\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"radiator\">radiator<\/a> and vents the heat while the now-cooled exhaust goes into the <a href=\"https:\/\/www.carparts.com\/intake-manifold\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"intake manifold\">intake manifold<\/a>. There, the exhaust mixes with fresh air and enters the engine to get burned anew.<\/p>\n\n\n\n<p>The PCM regularly checks the EGR cooling system to see if the latter is doing its job. If the computer doesn&rsquo;t get the right response, it will set the generic code P2457.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code P2457 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<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 Causes of the P2457 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Blocked EGR cooler<\/li><li>Leak or restriction in the engine coolant system<\/li><li>Faulty <a href=\"https:\/\/www.carparts.com\/egr-temperature-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR temperature sensor\">EGR temperature sensor<\/a><\/li><li>Restricted charge air cooler<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P2457 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>Vehicle stuck in &ldquo;<a href=\"https:\/\/www.carparts.com\/blog\/web-stories\/what-is-limp-mode\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"limp mode\">limp mode<\/a>&rdquo;<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2457 Code<\/h2>\n\n\n\n<p>The P2457 code is a generic code that various makes and models can log. However, this does not mean that there is a one-size-fits-all solution to identify its underlying problem.<\/p>\n\n\n\n<p>If you&rsquo;re not confident about conducting diagnostic tests on your vehicle, it&rsquo;s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P2457 Code<\/h2>\n\n\n\n<p>Attempting to fix a P2457 code can become challenging if you don&rsquo;t have the right tools and know-how to test the EGR cooler. In most cases, it&rsquo;s best to leave the job to professionals.<br>For DIYers with advanced technical knowledge and hands-on experience who prefer to test and replace their vehicle&rsquo;s EGR cooler 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<\/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>The exhaust gas recirculation (EGR) system returns exhaust gasses to the engine in an effort to reduce combustion temperatures and&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2457-code-exhaust-gas-recirculation-cooling-system-performance\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":72800,"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":[1846,3542,1323,1186,69],"ppma_author":[2607,2855],"class_list":{"0":"post-72794","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-egr-cooler","9":"tag-egr-temperature-sensor","10":"tag-engine-control-module-2","11":"tag-intake-manifold","12":"tag-radiator","13":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P2457 Code: Exhaust Gas Recirculation Cooling System Performance - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what a P2457 code means, the possible causes, and the common symptoms associated with this code. Read on.\" \/>\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\/p2457-code-exhaust-gas-recirculation-cooling-system-performance\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2457 Code: Exhaust Gas Recirculation Cooling System Performance - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what a P2457 code means, the possible causes, and the common symptoms associated with this code. 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