{"id":8299,"date":"2021-10-29T01:03:00","date_gmt":"2021-10-29T08:03:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=8299"},"modified":"2025-05-22T20:12:26","modified_gmt":"2025-05-23T03:12:26","slug":"p0446-code-evaporative-emission-control-system-vent-control-circuit-malfunction","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0446-code-evaporative-emission-control-system-vent-control-circuit-malfunction\/","title":{"rendered":"P0446 Code: Evaporative Emission Control System Vent Control Circuit Malfunction"},"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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column8299_ee5108-54 > .kt-inside-inner-col,.kadence-column8299_ee5108-54 > .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-column8299_ee5108-54 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column8299_ee5108-54 > .kt-inside-inner-col{flex-direction:column;}.kadence-column8299_ee5108-54 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column8299_ee5108-54 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column8299_ee5108-54{position:relative;}@media all and (max-width: 1024px){.kadence-column8299_ee5108-54 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column8299_ee5108-54 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column8299_ee5108-54 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-b1aaba  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-70e6c3\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading8299_ec64f6-73, .wp-block-kadence-advancedheading.kt-adv-heading8299_ec64f6-73[data-kb-block=\"kb-adv-heading8299_ec64f6-73\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading8299_ec64f6-73 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading8299_ec64f6-73[data-kb-block=\"kb-adv-heading8299_ec64f6-73\"] 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-heading8299_ec64f6-73 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading8299_ec64f6-73[data-kb-block=\"kb-adv-heading8299_ec64f6-73\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading8299_ec64f6-73 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading8299_ec64f6-73\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Code P0446 stands for &ldquo;Evaporative Emission Control System (EVAP) Vent Control Circuit Malfunction.&rdquo;<\/li>\n\n\n\n<li>The code is logged once your car&rsquo;s computer has detected a problem with the function of the EVAP system vent valve.<\/li>\n\n\n\n<li>The P0446 error code is more likely to be caused by a mechanically jammed closed vent valve or a mud dauber nest in the vent. However, it would depend on the year, make, and model of the vehicle.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>If you&rsquo;re getting a P0446 trouble code on your <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD-II\">OBD-II<\/a> scanner, read on to get an idea of what this means, what may have caused it, and how you can diagnose and fix it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0446 Code Mean?<\/h2>\n\n\n\n<p>Code P0446, otherwise known as Evaporative Emission Control System (EVAP) Vent Control Circuit Malfunction, indicates that your car&rsquo;s computer has detected (or believes it has detected) a problem with the function of the EVAP system vent valve.<\/p>\n\n\n\n<p>Your car&rsquo;s computer controls the vent valve (it also controls the purge valve). Additionally, the computer monitors the valve and its control circuit for problems. <strong>Code P0446 sometimes indicates that an electrical failure has been detected in either the vent valve itself or its control circuit.<\/strong><\/p>\n\n\n\n<p>While the P0446 can indicate an electrical problem on later model Fords, which, for some strange reason chooses to look at the vent valve electrical circuit to set this code, <strong>the P0446 code is highly unlikely to be an electrical concern on other makes<\/strong>. GMs and older Fords would set this code when the canister wouldn&rsquo;t vent after the EVAP test, and in those cases, <strong>this code is far more likely to be triggered by mechanical clogging.<\/strong><\/p>\n\n\n\n<p>Do note that code P0446 appears more commonly on older vehicles, usually from domestic manufacturers like GM. Dodge hasn&rsquo;t listed the code for a while, and models like the Toyota Camry also haven&rsquo;t listed the code since the 2007 model year.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1016\" height=\"762\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/car-purge-valve.jpg\" alt=\"mechanic pointing at a a car's purge valve\" class=\"wp-image-8306\" style=\"width:1016px;height:762px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/car-purge-valve.jpg 1016w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/car-purge-valve-300x225.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/car-purge-valve-768x576.jpg 768w\" sizes=\"(max-width: 1016px) 100vw, 1016px\"><figcaption class=\"wp-element-caption\">Code P0446 means the car&rsquo;s computer has detected a problem with the EVAP system vent valve. The EVAP system is primarily composed of the gas tank, gas cap, vent valve, purge valve, and charcoal canister.<\/figcaption><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\">P0446 on Some Toyota Vehicles<\/h3>\n\n\n\n<p>The code appears in a 2005 Toyota Camry 2.4L because of the following conditions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vacuum hose has cracks, holes, or is blocked, damaged or disconnected<\/li>\n\n\n\n<li>Fuel tank cap incorrectly installed<\/li>\n\n\n\n<li>Cracked or damaged fuel tank cap<\/li>\n\n\n\n<li>Open or short in vapor pressure sensor circuit<\/li>\n\n\n\n<li>Failed vapor pressure sensor<\/li>\n\n\n\n<li>Open or short in EVAP VSV circuit<\/li>\n\n\n\n<li>EVAP VSV issues<\/li>\n\n\n\n<li>Open or short in CCV circuit<\/li>\n\n\n\n<li>CCV issues<\/li>\n\n\n\n<li>Fuel tank has cracks, holes, or is damaged<\/li>\n\n\n\n<li>Cracked or damaged charcoal canister<\/li>\n\n\n\n<li>Fuel tank over fill check valve cracks, or is damaged<\/li>\n\n\n\n<li>ECM issues<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0446 Code?<\/h2>\n\n\n\n<p>Since there are varying descriptions of the P0446 code among car manufacturers, the possible causes can differ depending on the make and model of your car. <\/p>\n\n\n\n<p>Here are the most common causes of an EVAP System Malfunction or code P0446:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Malfunctioning vent control valve<\/li>\n\n\n\n<li>Clogged vent valve<\/li>\n\n\n\n<li>Control circuit issues (e.g., loose or damaged wiring)<\/li>\n\n\n\n<li>Powertrain control module hardware or software issues (rather uncommon)<\/li>\n<\/ul>\n\n\n\n<p>Code P0446 is set when the car&rsquo;s computer believes (either correctly or incorrectly) that there&rsquo;s a problem with the vent valve. Some systems use vacuum pressure readings to judge vent valve performance. As such, in some cases, parts that might surprise you can trigger the code. Examples include: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Failed charcoal canister<\/li>\n\n\n\n<li>Faulty purge valve <\/li>\n\n\n\n<li>Clogged or punctured vent hose or vent filter<\/li>\n\n\n\n<li>Failing EVAP system pressure sensor<\/li>\n<\/ul>\n\n\n\n<p>In a Lexus and Toyota, the code P0446 may point to a failing vacuum switching valve. This problem is very common to models from the two Japanese marques.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"769\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/error-indicator-light-1024x769.jpeg\" alt=\"malfunction indicator on the car speedometer\" class=\"wp-image-8308\" style=\"width:1024px;height:769px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/error-indicator-light-1024x769.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/error-indicator-light-300x225.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/error-indicator-light-768x577.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/03\/error-indicator-light.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The malfunction indicator light turns on if you get a P0446 Code.<\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0446 Code?<\/h2>\n\n\n\n<p>Anomalies in the EVAP system often come with symptoms that you shouldn&rsquo;t ignore. Below are the signs you need to look for if you get a P0446 code on your OBD-II scanner.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Illuminated malfunction indicator lamp or check engine light<\/li>\n\n\n\n<li>Noticeable fuel odor within the proximity of the vehicle (rather uncommon)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0446 Code<\/h2>\n\n\n\n<p>P0446 can be a serious issue. All potential causes must be looked into to come up with the correct diagnosis. Consider taking your vehicle to a professional automotive technician if you don&rsquo;t have enough DIY auto repair experience and skills. However, if you still want to take a stab at the diagnosis process, the videos below can help you do it correctly.<\/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=\"Wells CounterPoint Ep. 26 - GM P0446 Vent System Performance-Diagnose &amp; Fix it Right the First Time!\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Xc4UJIU0M70?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=\"Toyota Po441, P0446 EVAP Vacuum Switching Valve VSV Testing and Canister Replacement\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/FQFULrEY3NE?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 P0446 Code<\/h2>\n\n\n\n<p>There are multiple reasons why code P0446 might be stored. Therefore, there isn&rsquo;t a &ldquo;magic bullet&rdquo; fix for the issue. You&rsquo;ll need to diagnose the code accurately, as outlined above, then perform any necessary repairs.<\/p>\n\n\n\n<p>Also, keep in mind that all vehicles are different. When troubleshooting and repairing diagnostic trouble codes, you should consult the factory repair information for your application.<\/p>\n\n\n\n<p>Repair manuals, such as those from Chilton, are useful, but an ALLDATA subscription is even better. ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Notes About Code P0446 <\/h2>\n\n\n\n<p>P0446, in general, is a trouble code that&rsquo;s difficult to pinpoint right away. You will need to perform a series of extensive diagnoses to get to the problem. <\/p>\n\n\n\n<p>If you have an advanced scan tool at bay, you can use it to diagnose the P0446 code and get real-time powertrain control module data. This tool can also enable the vent and purge to turn the solenoid on and off to tell you where the leak is coming from.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">More on the EVAP System and P0466<\/h2>\n\n\n\n<p>Basically, the EVAP system is a collection of components working together to prevent fuel vapors from entering the atmosphere. Although system designs vary, typically, the primary components found within an EVAP system include the gas tank, the gas cap, the <a href=\"https:\/\/www.carparts.com\/fuel-tank-vent-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vent valve\">vent valve<\/a>, the purge valve, and the charcoal canister. <\/p>\n\n\n\n<p>When the engine is off, fuel vapors are stored in the charcoal canister, rather than escaping into the atmosphere. Once the engine is running and the appropriate conditions are met, the purge valve opens to allow the vapors to enter the engine, where they are burned during the normal combustion process. <\/p>\n\n\n\n<p>The vent valve, which allows fresh air to enter the charcoal canister, is usually open. But when your car&rsquo;s computer wants to check the EVAP system for leaks, it commands the electronically controlled vent valve to close, thereby sealing everything off. Then, the system can perform its self-test. <\/p>\n\n\n\n<p>As described earlier, the vent valve is normally open, so an electrical problem won&rsquo;t typically generate a P0446 on most platforms. The vent valve will remain mechanically open in those cases, which will vent the canister all the time &ndash; setting a different code, such as a P0455. <strong>The P0446 is more likely to be a mechanically stuck closed vent valve<\/strong> or a mud dauber nest in the vent. Again though, it would depend on the vehicle&rsquo;s year, make, and model.<\/p>\n\n\n\n    <div class=\"ai-summary-widget\">\n\n        <div class=\"ai-summary-grid\">\n\n            <div>\n                <div class=\"ai-avatar\">\n                    <figure>\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/ai-summary\/ai-bot\" alt=\"AI robot\">\n                    <\/figure>\n                    <span>ELI5<\/span>\n                <\/div>\n            <\/div>\n            <div>\n                <p>Think of your car as a bottle of soda, and the fuel vapors are like bubbles trying to escape. The EVAP system is like a clever cap that keeps the bubbles inside instead of letting them out into the air. When the car is parked, the bubbles are stored in a special sponge (the charcoal canister) inside the bottle. When the car starts running, a little door in the cap opens to send the bubbles into the engine, where they are used to power the car. Another door lets fresh air into the sponge to keep it clean and ready. If the car's computer wants to check for leaks, it seals the cap tightly to test the system. This helps the car keep the air outside fresh and clean.<\/p>    \n            <\/div>\n\n        <\/div>\n\n        <div class=\"ai-summary-tooltip\">   \n            <p>Not everyone is an auto repair expert. <strong>ELI5 (&ldquo;Explain Like I&rsquo;m Five&rdquo;)<\/strong> provides layperson-friendly explanations of complex automotive concepts, systems, &amp; parts, so you can fully understand their importance. Great for casual car owners and DIY beginners! Powered by AI.<\/p>\n        <\/div>\n\n    <\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get New EVAP System Parts to Clear Trouble Code P0446<\/h2>\n\n\n\n<p>If your OBD-II scanner reads a P0446 trouble code is present, you could be looking at malfunctioning parts like the <a href=\"https:\/\/www.carparts.com\/purge-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"purge valve\">purge valve<\/a> or <a href=\"https:\/\/www.carparts.com\/search?q=vapor_canister_vent_valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vapor canister vent valve\">vapor canister vent valve<\/a>. But whatever the problem is, you can rest assured that <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a> has the right parts to fix your ride.<\/p>\n\n\n\n<p>Our website has everything you need to get your vehicle back on the road in a jiffy. Simply enter your ride&rsquo;s year, make, and model into our vehicle selector to view direct-fit replacement parts for your daily driver. You can also use the search filters to find products according to your preferred brand, price range, quantity, and more.<\/p>\n\n\n\n<p>All our products passed strict quality checks to ensure that they can withstand tough operating environments and extreme temperatures. Order now, and check out securely in a matter of minutes.<\/p>\n\n\n\n<p>Never worry about going over budget when you shop from us. All our products come with a low-price and lifetime replacement guarantee, helping you get the best value for your money.<\/p>\n\n\n\n<p>Thanks to our strategically located warehouses across the US, you can get the parts you need delivered straight to your doorstep in as fast as two business days.<\/p>\n\n\n\n<p>Check out our EVAP system parts today!<\/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<a href=\"https:\/\/www.carparts.com\/vapor-canister\" target=\"_blank\" aria-label=\"vapor canister\" 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\/rb38640001_1\">\n<strong>Vapor Canister<\/strong>\n<\/a>\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<!-- 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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>If you&rsquo;re getting a P0446 trouble code on your OBD-II scanner, read on to get an idea of what this&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0446-code-evaporative-emission-control-system-vent-control-circuit-malfunction\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":8307,"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-8299","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 v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0446 Code: Evaporative Emission Control System Vent Control Circuit Malfunction - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"The EVAP system prevents fuel fumes from leaking out and recycles it back to the engine. Learn about a failing EVAP system and the P0446 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\/p0446-code-evaporative-emission-control-system-vent-control-circuit-malfunction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0446 Code: Evaporative Emission Control System Vent Control Circuit Malfunction - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"The EVAP system prevents fuel fumes from leaking out and recycles it back to the engine. 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