{"id":67088,"date":"2022-03-01T01:34:10","date_gmt":"2022-03-01T09:34:10","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=67088"},"modified":"2024-12-17T18:07:50","modified_gmt":"2024-12-18T02:07:50","slug":"p2440-code-secondary-air-injection-system-switching-valve-stuck-open","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2440-code-secondary-air-injection-system-switching-valve-stuck-open\/","title":{"rendered":"P2440 Code: Secondary Air Injection System Switching Valve Stuck Open"},"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-column67088_c7a625-88 > .kt-inside-inner-col,.kadence-column67088_c7a625-88 > .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-column67088_c7a625-88 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column67088_c7a625-88 > .kt-inside-inner-col{flex-direction:column;}.kadence-column67088_c7a625-88 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column67088_c7a625-88 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column67088_c7a625-88{position:relative;}@media all and (max-width: 1024px){.kadence-column67088_c7a625-88 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column67088_c7a625-88 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column67088_c7a625-88 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-64af1e  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-b891eb\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading67088_89575f-dc, .wp-block-kadence-advancedheading.kt-adv-heading67088_89575f-dc[data-kb-block=\"kb-adv-heading67088_89575f-dc\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading67088_89575f-dc mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading67088_89575f-dc[data-kb-block=\"kb-adv-heading67088_89575f-dc\"] 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-heading67088_89575f-dc img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading67088_89575f-dc[data-kb-block=\"kb-adv-heading67088_89575f-dc\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading67088_89575f-dc summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading67088_89575f-dc\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Diagnostic trouble code (DTC) P2440 stands for &ldquo;Secondary Air Injection System Switching Valve Stuck Open.&rdquo;<\/li>\n\n\n\n<li>The code is logged once the PCM detects an issue with the secondary air-injection system that could point to a valve that&rsquo;s stuck open.<\/li>\n\n\n\n<li>The common causes of a P2440 code include a bad secondary air injection valve, a disconnected vacuum hose, a wiring issue, a malfunctioning secondary air pump, and a PCM malfunction.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Some vehicles have a secondary air-injection system that provides the necessary air for the oxidizing process that limits tailpipe emissions. The process occurs either at the exhaust manifold or inside the catalytic converter.<\/p>\n\n\n\n<p>The secondary air-injection system has a smog pump or thermactor pump that&rsquo;s either electric or driven by a belt from the crankshaft pulley. The pump pulls fresh air through a filter and pushes the air to each exhaust port through connecting hoses or a manifold. If the powertrain control module (PCM) detects any problem with the secondary air-injection system, a P2440 code will be set.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2440 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) P2440 stands for &ldquo;Secondary Air Injection System Switching Valve Stuck Open.&rdquo;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"603\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/diagram-showing-diverter-valve-1024x603.jpg\" alt=\"diagram showing diverter valve\" class=\"wp-image-81752\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/diagram-showing-diverter-valve-1024x603.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/diagram-showing-diverter-valve-300x177.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/diagram-showing-diverter-valve-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/diagram-showing-diverter-valve-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/diagram-showing-diverter-valve.jpg 1160w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Notice how the diverter (switching) valve in this diagram controls airflow into the exhaust. Note that this is a rudimentary schematic, but it gets the point across. The diverter (switching) valve should be closed unless it is commanded open. When the O2 sensor detects a lot of oxygen entering the exhaust when the valve is commanded closed, the P2440 code or a similar one will be set. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>The secondary air-injection system pumps fresh air into the exhaust system to help burn exhaust emissions as the engine warms up. Depending on the vehicle, the system may supply air to the <a href=\"https:\/\/www.carparts.com\/exhaust-manifold\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust manifolds\">exhaust manifolds<\/a>, the <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a>, or both at different times. The additional air helps reduce harmful exhaust gasses through oxidation. Also, the catalytic converter warms up more quickly when air is added to the exhaust manifolds.<\/p>\n\n\n\n<p>The secondary air-injection system has check valves and solenoids that the vehicle&rsquo;s computer switches on and off. Once the PCM detects an issue with the secondary air-injection system that could point to a stuck open valve, on-board diagnostics (OBD) will log a P2440 code.&nbsp;<\/p>\n\n\n\n<p>If you want more information that can help you understand P2440 better, read our in-depth discussion about the <a href=\"https:\/\/www.carparts.com\/blog\/p0491-code-secondary-air-injection-system-insufficient-flow-bank-1\/#A_Closer_Look_at_the_Secondary_Air_AIR_System\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"secondary air system\">secondary air system<\/a>.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P2440 can differ depending on the vehicle manufacturer. Consult 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 P2440 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faulty secondary air injection valve<\/li>\n\n\n\n<li>Clogged or disconnected <a href=\"https:\/\/www.carparts.com\/vacuum-hose\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vacuum hose\">vacuum hose<\/a><\/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\/secondary-air-injection-pump\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Secondary air pump\">Secondary air pump<\/a> failure<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> issues<\/li>\n<\/ul>\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 Symptoms of the P2440 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>Engine performance problems, such as rough running and <a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-accelerate-properly-when-i-push-the-gas-causes\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"poor acceleration\">poor acceleration<\/a><\/li>\n\n\n\n<li>Vehicle stuck in &ldquo;limp&rdquo; mode<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2440 Code<\/h2>\n\n\n\n<p>DTC P2440 is a generic powertrain code that various vehicles can log. While this might be the case, keep in mind that the steps for diagnosis and repair can vary depending on a vehicle&rsquo;s specifications.<\/p>\n\n\n\n<p>If you&rsquo;re not familiar with the process of diagnosing trouble codes by yourself, it&rsquo;s best to bring your vehicle to a certified mechanic. But if you think you have enough experience with auto repair, then you can go ahead and do it yourself.<\/p>\n\n\n\n<p>Here&rsquo;s a video to give you an idea of what the process might involve:<\/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=\"Toyota Tundra AIR Injection Code P2440, P2441, P2442, P2443\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/75q5PSBMX7U?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 Code P2440<\/h2>\n\n\n\n<p>Attempting to fix a P2440 code can be a frustrating and confusing task if you&rsquo;re not equipped with the right tools and automotive know-how. If you&rsquo;re not confident with your DIY skills yet, it&rsquo;s best to bring your vehicle to a professional to get the job done.<\/p>\n\n\n\n<p>If you plan on fixing this trouble code on your own, make sure to have the right manuals before proceeding. <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Guides like those from Chilton or an ALLDATA subscription\">Guides like those from Chilton or an ALLDATA subscription<\/a> contain vehicle-specific repair information, so you might want to check those out before you start.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a New Secondary Air Injector Valve for Your Ride<\/h2>\n\n\n\n<p>Faulty components can jeopardize your engine&rsquo;s performance. A bad secondary air injector valve, for example, can cause symptoms like rough running and poor acceleration. Luckily, finding a replacement valve for your ride is now quick and easy.<\/p>\n\n\n\n<p>Find a direct-fit <a href=\"https:\/\/www.carparts.com\/secondary-air-injection-check-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"secondary air injector valve\">secondary air injector valve<\/a> for your ride with just a few clicks. Here at <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>, you can find top-notch replacement parts that are sold at unbeatable prices. Our friendly customer service team is ready to assist you anytime if you have queries about a product.<\/p>\n\n\n\n<p>Simply input your ride&rsquo;s exact details into our easy-to-use vehicle selector to view our selection of compatible secondary air injector valves for your ride. All our replacement parts are screened by our team of industry experts to ensure utmost quality and performance. Order now, and we&rsquo;ll make sure your replacement part arrives in just a few days.<\/p>\n\n\n\n<p>Check out our selection now, and enjoy the best deals on aftermarket replacement parts!<\/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>Some vehicles have a secondary air-injection system that provides the necessary air for the oxidizing process that limits tailpipe emissions&#8230;. <a href=\"https:\/\/www.carparts.com\/blog\/p2440-code-secondary-air-injection-system-switching-valve-stuck-open\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":67179,"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":[1323,2058,2064,3211],"ppma_author":[2607,2985],"class_list":{"0":"post-67088","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-secondary-air-injection-check-valve","10":"tag-secondary-air-injection-pump","11":"tag-vacuum-hose-2","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>P2440 Code: Secondary Air Injection System Switching Valve Stuck Open - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what a P2440 code means and learn about its most common causes and symptoms. Plus check out the best way to do diagnosis and troubleshooting.\" \/>\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\/p2440-code-secondary-air-injection-system-switching-valve-stuck-open\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2440 Code: Secondary Air Injection System Switching Valve Stuck Open - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what a P2440 code means and learn about its most common causes and symptoms. Plus check out the best way to do diagnosis and troubleshooting.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p2440-code-secondary-air-injection-system-switching-valve-stuck-open\/\" \/>\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=\"2022-03-01T09:34:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-12-18T02:07:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/automotive-exhaust-system-showing-the-catalytic-converter.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1700\" \/>\n\t<meta property=\"og:image:height\" content=\"1133\" \/>\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\\\/p2440-code-secondary-air-injection-system-switching-valve-stuck-open\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p2440-code-secondary-air-injection-system-switching-valve-stuck-open\\\/\"},\"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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