{"id":12578,"date":"2022-02-08T23:49:00","date_gmt":"2022-02-09T07:49:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=12578"},"modified":"2024-07-16T18:43:26","modified_gmt":"2024-07-17T01:43:26","slug":"p0449-code-evaporative-emission-system-vent-control-circuit-intermittent","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0449-code-evaporative-emission-system-vent-control-circuit-intermittent\/","title":{"rendered":"P0449 Code: Evaporative Emission System Vent Control Circuit Intermittent"},"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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_124cdf-3f > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_124cdf-3f > .kt-inside-inner-col,.kadence-column_124cdf-3f > .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_124cdf-3f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_124cdf-3f > .kt-inside-inner-col{flex-direction:column;}.kadence-column_124cdf-3f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_124cdf-3f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_124cdf-3f{position:relative;}@media all and (max-width: 1024px){.kadence-column_124cdf-3f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_124cdf-3f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_124cdf-3f qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-473e10  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-ffa393\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_5f574e-26, .wp-block-kadence-advancedheading.kt-adv-heading_5f574e-26[data-kb-block=\"kb-adv-heading_5f574e-26\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_5f574e-26 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_5f574e-26[data-kb-block=\"kb-adv-heading_5f574e-26\"] 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_5f574e-26 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_5f574e-26[data-kb-block=\"kb-adv-heading_5f574e-26\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_5f574e-26 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_5f574e-26\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Code P0449 stands for &ldquo;Evaporative System Vent Control Circuit Malfunction.&rdquo; It&rsquo;s logged when the PCM detects that the EVAP system vent valve&rsquo;s state doesn&rsquo;t match the right state for a specific period.<\/li><li>A faulty evaporative system vent valve solenoid, connector pin fit issues, vent valve circuit problems, malfunctioning circuits, faulty electrical connections, and PCM problems could trigger the code.<\/li><li>An illuminated check engine light is the most common symptom of this trouble code.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The EVAP system is designed to capture and purge any fuel vapors in the fuel storage system. Instead of allowing these pollutants to leak into the atmosphere, the <a href=\"https:\/\/www.carparts.com\/blog\/evaporative-emission-control-evap-system-101-the-basics\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EVAP system\">EVAP system<\/a> stores the fuel vapors in a charcoal canister until they can be reintroduced into the combustion cycle.<\/p>\n\n\n\n<p>When vehicle diagnostics detect a problem with the evaporative emission system vent control circuit, a P0449 code is logged by the car&rsquo;s computer.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-checking-the-engine-1024x683.jpeg\" alt=\"mechanic checking the engine\" class=\"wp-image-12581\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-checking-the-engine-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-checking-the-engine-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-checking-the-engine-768x513.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-checking-the-engine-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/07\/mechanic-checking-the-engine.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>When the actual state of the EVAP system vent valve does not match the desired state for a specific amount of time, code P0449 may get triggered.<\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\">What Does the P0449 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0449 stands for &ldquo;Evaporative System Vent Control Circuit Malfunction.&rdquo; The code is set when the PCM detects that the actual state of the EVAP system vent valve does not match the desired state for a specific amount of time.<\/p>\n\n\n\n<p>Code P0449 is a generic <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain code\">powertrain code<\/a> which can be logged by vehicle diagnostics in various models manufactured from 1996 onwards. This means the code is supported by a variety of different makes and models, and as such, the process of diagnosis and repair may vary depending on each vehicle.<\/p>\n\n\n\n<p>You can learn more information by reading our brief technical discussion about <a href=\"#More_About_EVAP_Systems_and_P0449\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"EVAP systems and code P0449.\">EVAP systems and code P0449.<\/a><\/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 Possible Causes of the P0449 Code?<\/h2>\n\n\n\n<p>Code P0449 is typically logged when an electrical problem in the circuit or a mechanical problem with the vent valve interferes with its operation. However, there are a lot of other problems that can cause onboard diagnostics to trigger the P0449 code.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Damaged or faulty evaporative system vent valve solenoid<\/li><li>Connector pin fit issues<\/li><li>Vent valve circuit problem (e.g., damaged wire or a poor connection), circuit malfunction, or faulty electrical connections<\/li><li>PCM problems (e.g., software needs an update)<\/li><\/ul>\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\/2020\/12\/vapor-canister-vent-solenoid-1024x819.jpg\" alt=\"vapor canister vent solenoid\" class=\"wp-image-20513\" width=\"1024\" height=\"819\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/vapor-canister-vent-solenoid-1024x819.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/vapor-canister-vent-solenoid-300x240.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/vapor-canister-vent-solenoid-768x614.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/vapor-canister-vent-solenoid-150x120.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/vapor-canister-vent-solenoid.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A damaged or faulty evaporative system vent valve solenoid is one of the possible causes of the P0449 code.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0449 DTC?<\/h2>\n\n\n\n<p>The most common symptom of a P0449 is an <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>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Illuminated Check Engine Light<\/h3>\n\n\n\n<p>OBD-II code P0449 will trigger the Check Engine Light to illuminate. However, you will need to connect your vehicle to a scan tool to determine if there is a malfunction in the EVAP system vent control circuit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0449 Code<\/h2>\n\n\n\n<p>An accurate diagnosis is crucial in resolving the P0449 code. You can either leave the task to your mechanic or determine what triggered the code yourself. If you pick the latter, watch these video references to get an idea of what the diagnostic process involves:<\/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=\"GMC \/ Chevy Truck -DTC P0449 EVAP Vent Solenoid Control Circuit\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/h3b0zn7IN0U?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<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=\"EVAP Code P0449\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/AlfOSMmisPg?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 P0449 Code<\/h2>\n\n\n\n<p>Like other OBD-II codes, the repair process for the P0449 code varies based on what caused the issue and, in some cases, the vehicle&rsquo;s make and model. For instance, replacing the EVAP canister vent solenoid\/valve is one of the most common confirmed fixes for P0449 in a <a href=\"https:\/\/www.carparts.com\/vapor-canister-vent-solenoid\/chevrolet\/avalanche\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Chevy Avalanche\">Chevy Avalanche<\/a>.<\/p>\n\n\n\n<p>However, it may not work as well for vehicles from other automakers.<\/p>\n\n\n\n<p>IIf you are certain of your automotive knowledge and DIY skills, you may resolve the issue yourself. Use <a href=\"\/\/www.carparts.com\/blog\/best-online-resources-to-help-you-learn-how-to-fix-cars\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"online auto repair resources and guides\">online auto repair resources and guides<\/a> or get an ALLDATA subscription to figure out the right way to resolve the issue.<\/p>\n\n\n\n<p>Also, <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"consult your owner&rsquo;s manual\">consult your owner&rsquo;s manual<\/a> before performing repairs to avoid accidentally worsening the issue with a fix that&rsquo;s inappropriate for your vehicle.<\/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\/2020\/12\/engine-control-module-black-1024x683.jpeg\" alt=\"engine control module black\" class=\"wp-image-20522\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/engine-control-module-black-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/engine-control-module-black-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/engine-control-module-black-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/engine-control-module-black-1536x1024.jpeg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/engine-control-module-black-scaled.jpeg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/engine-control-module-black-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/12\/engine-control-module-black-150x100.jpeg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>An accurate diagnosis of symptoms is crucial in resolving trouble codes.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">More About EVAP Systems and P0449<\/h2>\n\n\n\n<p>Earlier EVAP canisters (pre OBD2) have an open vent that allows atmosphere to be drawn through the canister when the purge valve opens and delivers vacuum from the manifold to the canister. On those older platforms, EVAP purge only happened at off-idle. Typically there was a vacuum valve that was opened by &ldquo;ported&rdquo; vacuum when the engine was warm. Sometimes EGR and EVAP would operate concurrently.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Earlier EVAP canisters (pre OBD2) have an open vent that allows atmosphere to be drawn through the canister when the purge valve opens and delivers vacuum from the manifold to the canister.<\/p><cite><em>&ndash;&nbsp;<\/em><a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p>That changed with the enhanced EVAP systems that were designed to detect leaks.<\/p>\n\n\n\n<p>To determine if the EVAP system (fuel tank, canister, lines, etc.) has a vapor leak larger than .020 inch, the ECM\/PCM energizes a normally open canister vent solenoid, which has a 12 volt feed and a ground trigger. When the vent is closed, the EVAP purge solenoid puts a very weak vacuum on the fuel system (including the canister) and traps it there while watching the fuel tank pressure sensor or a reed switch of some kind in a special assembly to determine if the weak vacuum is being lost.<\/p>\n\n\n\n<p>Code P0449 focuses on the <strong>canister vent solenoid<\/strong>, which is constantly checked for an open circuit by the ECM\/PCM.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a New Vapor Canister Vent Solenoid<\/h2>\n\n\n\n<p>If your vehicle logged the P0449 code because of a faulty <a href=\"https:\/\/www.carparts.com\/vapor-canister-vent-solenoid\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vapor canister vent solenoid\">vapor canister vent solenoid<\/a>, it&rsquo;s best to replace it immediately. Otherwise, it could cause other issues and trigger other trouble codes, resulting in costly repairs. Thankfully, you can easily find an excellent replacement here at <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>Use our vehicle selector to check out compatible solenoids. Our solenoids come with a guaranteed fit, taking the guesswork out of finding a part for your daily driver.<\/p>\n\n\n\n<p>We source our parts from top-notch brands, so you&rsquo;re sure to get a vapor canister vent solenoid that&rsquo;s built to last. Once you&rsquo;ve placed your order, you can expect it at your doorstep in as fast as two business days. If you have questions, our friendly customer service team is ready 24\/7 to assist you.<\/p>\n\n\n\n<p>If you&rsquo;re on a tight budget, don&rsquo;t worry. We offer vapor canister vent solenoids at unbeatable prices. Shop now, and restore your ride&rsquo;s outstanding performance in no time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n<!-- start of editable content -->\n\n\n<a href=\"https:\/\/www.carparts.com\/purge-valve\" target=\"_blank\" aria-label=\"purge valve\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/rs38430001_1\">\n<strong>Purge Valve<\/strong>\n<\/a>\n\n\n<a href=\"https:\/\/www.carparts.com\/vapor-canister-vent-solenoid\" target=\"_blank\" aria-label=\"vapor canister vent solenoid\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/rk32150001_1\">\n<strong>Vapor Canister Vent Solenoid<\/strong>\n<\/a>\n\n<!-- end of editable content -->\n\n<\/div>\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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The EVAP system is designed to capture and purge any fuel vapors in the fuel storage system. Instead of allowing&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0449-code-evaporative-emission-system-vent-control-circuit-intermittent\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":12582,"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":[504,1235],"ppma_author":[2607,2985],"class_list":{"0":"post-12578","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","9":"tag-purge-valve","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0449 Code: Evaporative Emission System Vent Control Circuit Intermittent - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what OBD-II code P0449 means, what triggers it, and the common symptoms associated with this engine trouble code. 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