{"id":77909,"date":"2022-11-14T15:52:18","date_gmt":"2022-11-14T23:52:18","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=77909"},"modified":"2024-12-17T18:24:02","modified_gmt":"2024-12-18T02:24:02","slug":"p2400-code-evaporative-emission-system-leak-detection-pump-control","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2400-code-evaporative-emission-system-leak-detection-pump-control\/","title":{"rendered":"P2400 Code: Evaporative Emission System Leak Detection Pump Control"},"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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column77909_75e191-e2 > .kt-inside-inner-col,.kadence-column77909_75e191-e2 > .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-column77909_75e191-e2 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column77909_75e191-e2 > .kt-inside-inner-col{flex-direction:column;}.kadence-column77909_75e191-e2 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column77909_75e191-e2 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column77909_75e191-e2{position:relative;}@media all and (max-width: 1024px){.kadence-column77909_75e191-e2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column77909_75e191-e2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column77909_75e191-e2 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-db018e  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-753750\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading77909_a0934b-a7, .wp-block-kadence-advancedheading.kt-adv-heading77909_a0934b-a7[data-kb-block=\"kb-adv-heading77909_a0934b-a7\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading77909_a0934b-a7 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading77909_a0934b-a7[data-kb-block=\"kb-adv-heading77909_a0934b-a7\"] 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-heading77909_a0934b-a7 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading77909_a0934b-a7[data-kb-block=\"kb-adv-heading77909_a0934b-a7\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading77909_a0934b-a7 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading77909_a0934b-a7\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The diagnostic trouble code (DTC) P2400 indicates &ldquo;Evaporative Emission System Leak Detection Pump Control.&rdquo;<\/li>\n\n\n\n<li>In vehicles like the 2006 Audi A4 Quattro with a 2.0L tank, the P2400 code is described as &ldquo;Evaporative Emission System Leak Detection Pump Control Circuit\/Open.&rdquo;<\/li>\n\n\n\n<li>The powertrain control module (PCM) will log the P2400 code if it notices the pressure drop in the fuel tank, and it will activate the leak detection pump switch.<\/li>\n\n\n\n<li>OBD2 systems might purge the EVAP canister while the engine is running, so avoid packing the fuel tank during refueling.<\/li>\n\n\n\n<li>Common causes of the P2400 code include a bad EVAP system leak detection pump, wiring issues, and PCM failure.<\/li>\n\n\n\n<li>The P2400 code&rsquo;s symptom is an illuminated check light.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/blog\/evaporative-emission-control-evap-system-101-the-basics\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"evaporative emission (EVAP) control system\">evaporative emission (EVAP) control system<\/a> traps and holds gasoline vapors. These vapors are routed to a <a href=\"https:\/\/www.carparts.com\/vapor-canister\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"charcoal canister\">charcoal canister<\/a>. They pass through the intake airflow where they&rsquo;re burned inside the engine instead of being released into the atmosphere.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2400 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) P2400 stands for &ldquo;Evaporative Emission System Leak Detection Pump Control.&rdquo;<\/p>\n\n\n\n<p>Some <a href=\"https:\/\/www.carparts.com\/toyota\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Toyota\">Toyota<\/a> and <a href=\"https:\/\/www.carparts.com\/dodge\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Dodge\">Dodge<\/a> vehicles have a vacuum-operated <a href=\"https:\/\/www.carparts.com\/evaporative-emissions-system-leak-detection-pump\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"leak detection pump\">leak detection pump<\/a> to help diagnose the EVAP control system. The pump comes with a vent valve that&rsquo;s normally open to let fresh air pass through before it reaches the charcoal canister. The charcoal canister can be found under the hood or vehicle and comes with activated charcoal granules to help trap fuel vapors.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"568\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/leak-detection-pump-diagram-1024x568.jpg\" alt=\"leak detection pump diagram\" class=\"wp-image-77910\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/leak-detection-pump-diagram-1024x568.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/leak-detection-pump-diagram-300x166.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/leak-detection-pump-diagram-768x426.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/leak-detection-pump-diagram-1536x852.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/leak-detection-pump-diagram-150x83.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/leak-detection-pump-diagram.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Leak detection pump diagram | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>The leak detection pump has a spring attached to a diaphragm, which applies pressure to the fuel tank. Once the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> notices that the pressure has dropped in the fuel tank, it will trigger the leak detection pump switch. Large leaks will cause the pump to work in shorter pump periods, while small leaks will lead to longer pump periods.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Note About &ldquo;Packing&rdquo; the Fuel Tank<\/h3>\n\n\n\n<p>Early (pre-OBD2) systems only purged the canister when the engine was above idle and warm. OBD2 systems may purge the canister any time the engine is running, even at idle.&nbsp;<\/p>\n\n\n\n<p>That&rsquo;s why it&rsquo;s important not to &ldquo;pack&rdquo; the fuel tank, but let the nozzle stop when it clicks off. If you pack the tank, you can saturate the canister with fuel. The purge system doesn&rsquo;t know this and if it begins to purge at idle, the engine may almost stall and then over-correct with the idle speed control, causing the vehicle to surge ahead unexpectedly at a traffic light or a drive-thru. Again, it&rsquo;s best not to pack the gas tank.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of <\/em><em>code P2400<\/em><em> 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<p>For more information about the P2400 code, read our notes on the leak detection pump.<\/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\">P2400 on Some Audi A4 Quattro Vehicles<\/h2>\n\n\n\n<p>In vehicles like the 2006 Audi A4 Quattro with a 2.0L tank, the P2400 code is described as &ldquo;Evaporative Emission System Leak Detection Pump Control Circuit\/Open.&rdquo;<\/p>\n\n\n\n<p>To diagnose the issue, experts recommend inspecting the EVAP canister system for seal leaks. There should also be a signal voltage greater than 4.4-5.6V if a digital multimeter is used to check the system.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of the P2400 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>EVAP system leak detection pump failure<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Wiring\">Wiring<\/a> issues<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Powertrain control module failure\">Powertrain control module failure<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P2400 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<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2400 Code<\/h2>\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\/2022\/11\/mechanic-diagnosing-p2400-code-1024x683.jpg\" alt=\"mechanic diagnosing p2400 code\" class=\"wp-image-77912\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-diagnosing-p2400-code-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-diagnosing-p2400-code-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-diagnosing-p2400-code-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-diagnosing-p2400-code-1536x1025.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-diagnosing-p2400-code-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-diagnosing-p2400-code-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-diagnosing-p2400-code-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-diagnosing-p2400-code.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">DTC P2400 is a generic powertrain code that can be logged in vehicles with an OBD-II system.<\/figcaption><\/figure>\n\n\n\n<p>DTC P2400 is a generic powertrain code that can be logged in vehicles with an OBD-II system. While this might be the case, steps for diagnosis and repair can vary, depending on vehicle specifications.&nbsp;<\/p>\n\n\n\n<p>Diagnosing a P2400 code might require the use of a scan tool and visually inspecting the affected system for leaks and shorted wiring. If you&rsquo;re not used to handling such tasks, you can always seek the help of a trained professional to assist you. Otherwise, you can go ahead and do the job yourself.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P2400 Code<\/h2>\n\n\n\n<p>Without the right tools and automotive know-how, attempting to fix a P2400 code can be tricky. It can even lead to further complications if done incorrectly. So if you&rsquo;re not well-versed in automotive repair yet, it might be best to leave the job to the pros. This will ensure that all steps and protocols are followed correctly.&nbsp;<\/p>\n\n\n\n<p>But if you know your way around trouble codes, then you already know how important <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vehicle-specific repair manuals\">vehicle-specific repair manuals<\/a> are. So before resolving this code on your daily driver, make sure to check out guides like those from Chilton or an ALLDATA subscription to get guides that are tailor-fit for your vehicle&rsquo;s year, make, and model.<\/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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The evaporative emission (EVAP) control system traps and holds gasoline vapors. These vapors are routed to a charcoal canister. They&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2400-code-evaporative-emission-system-leak-detection-pump-control\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":77911,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"_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":[1323,3508,1198,1663],"ppma_author":[2607,2985],"class_list":{"0":"post-77909","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-engine-control-module-2","9":"tag-evaporative-emissions-system-leak-detection-pump","10":"tag-fuel-tank-2","11":"tag-vapor-canister","12":"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>P2400 Code: Evaporative Emission System Leak Detection Pump Control - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Here\u2019s the meaning behind a P2400 code, as well as the most common causes and 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\/p2400-code-evaporative-emission-system-leak-detection-pump-control\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2400 Code: Evaporative Emission System Leak Detection Pump Control - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Here\u2019s the meaning behind a P2400 code, as well as the most common causes and symptoms associated with it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p2400-code-evaporative-emission-system-leak-detection-pump-control\/\" \/>\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=\"2022-11-14T23:52:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-12-18T02:24:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-checks-obd-tool-on-computer.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=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2400-code-evaporative-emission-system-leak-detection-pump-control\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2400-code-evaporative-emission-system-leak-detection-pump-control\\\/\"},\"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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