{"id":67581,"date":"2022-03-15T00:48:46","date_gmt":"2022-03-15T07:48:46","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=67581"},"modified":"2024-08-16T05:29:43","modified_gmt":"2024-08-16T12:29:43","slug":"p0418-code-secondary-air-injection-system-control-a-circuit","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0418-code-secondary-air-injection-system-control-a-circuit\/","title":{"rendered":"P0418 Code: Secondary Air Injection System Control &#8220;A&#8221; Circuit"},"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-column67581_4f853d-ea > .kt-inside-inner-col,.kadence-column67581_4f853d-ea > .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-column67581_4f853d-ea > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column67581_4f853d-ea > .kt-inside-inner-col{flex-direction:column;}.kadence-column67581_4f853d-ea > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column67581_4f853d-ea > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column67581_4f853d-ea{position:relative;}@media all and (max-width: 1024px){.kadence-column67581_4f853d-ea > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column67581_4f853d-ea > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column67581_4f853d-ea inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-d32d0d  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-5dcabd\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading67581_f7e5b5-d0, .wp-block-kadence-advancedheading.kt-adv-heading67581_f7e5b5-d0[data-kb-block=\"kb-adv-heading67581_f7e5b5-d0\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading67581_f7e5b5-d0 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading67581_f7e5b5-d0[data-kb-block=\"kb-adv-heading67581_f7e5b5-d0\"] 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-heading67581_f7e5b5-d0 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading67581_f7e5b5-d0[data-kb-block=\"kb-adv-heading67581_f7e5b5-d0\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading67581_f7e5b5-d0 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading67581_f7e5b5-d0\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The P0418 code stands for &ldquo;Secondary Air Injection (SAI) System Control &lsquo;A&rsquo; Circuit,&rdquo; which means the powertrain control module (PCM) detected that the SAI control circuit&rsquo;s voltage signal differs from the expected value.<\/li>\n\n\n\n<li>A bad SAI pump relay, a broken SAI pump, and wiring or connector issues are common causes of the P0418 code.<\/li>\n\n\n\n<li>An illuminated check engine light and the vehicle being stuck in &ldquo;limp mode&rdquo; are common symptoms of the P0418 code.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Modern vehicles are composed of different systems that work together to keep your ride running smoothly. The role of the secondary air injection (SAI) system is to supply fresh air to the exhaust stream to reduce emissions. On many vehicles, this system also helps the catalytic converter get to its operating temperature when the engine starts.<\/p>\n\n\n\n<p>P0418 is a trouble code related to a malfunction in the secondary air injection system control circuit. Read on to learn more about it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0418 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) P0418 stands for &ldquo;Secondary Air Injection System Control &ldquo;A&rdquo; Circuit.&rdquo; The A designation can mean it&rsquo;s the only circuit or its specific circuit out of multiple circuits in the system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How the SAI System Works<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"602\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Black-Secondary-Air-Injection-Pump-for-Car-1024x602.jpg\" alt=\"Black Secondary Air Injection Pump for Car\" class=\"wp-image-67584\" style=\"width:1024px;height:602px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Black-Secondary-Air-Injection-Pump-for-Car-1024x602.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Black-Secondary-Air-Injection-Pump-for-Car-300x176.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Black-Secondary-Air-Injection-Pump-for-Car-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Black-Secondary-Air-Injection-Pump-for-Car-1536x904.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Black-Secondary-Air-Injection-Pump-for-Car-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Black-Secondary-Air-Injection-Pump-for-Car.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The SAI system is equipped with either a belt-driven pump or an electric pump.<\/figcaption><\/figure>\n\n\n\n<p>Some vehicles have an SAI system to reduce harmful emissions through oxidation. This system is equipped with either a belt-driven pump or an electric pump. This pump draws ambient air, compresses it to some degree, and routes the pressurized air into the <a href=\"https:\/\/www.carparts.com\/exhaust-manifold\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust manifolds\">exhaust manifolds<\/a> or <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converter\">catalytic converter<\/a>. Your vehicle&rsquo;s powertrain control module (PCM) controls the valves in the system to regulate and distribute air correctly.<\/p>\n\n\n\n<p>The PCM monitors fluctuations in air pressure using input voltage signals. Once the PCM detects a voltage signal from the SAI control circuit that&rsquo;s not according to what&rsquo;s expected, it will trigger the P0418 code.<\/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<p><em><strong>Note:<\/strong> The definition of code P0418 could 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<h2 class=\"wp-block-heading\">What Are the Common Causes of the P0418 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bad <a href=\"https:\/\/www.carparts.com\/secondary-air-injection-pump-relay\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"SAI pump relay\">SAI pump relay<\/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> and\/or connector issues<\/li>\n\n\n\n<li>Malfunctioning <a href=\"https:\/\/www.carparts.com\/secondary-air-injection-pump\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"SAI pump\">SAI pump<\/a><\/li>\n\n\n\n<li>Blown SAI system fuses<\/li>\n\n\n\n<li>An issue with the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a>, such as software in need of an update<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Symptoms of the P0418 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\/03\/car-check-engine-light-illuminated-clear-view-1024x683.jpg\" alt=\"car check engine light illuminated clear view\" class=\"wp-image-67583\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-check-engine-light-illuminated-clear-view-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-check-engine-light-illuminated-clear-view-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-check-engine-light-illuminated-clear-view-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-check-engine-light-illuminated-clear-view-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-check-engine-light-illuminated-clear-view-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-check-engine-light-illuminated-clear-view-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-check-engine-light-illuminated-clear-view-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">An illuminated check engine light is a common symptom of the P0418 Code.<\/figcaption><\/figure>\n\n\n\n<p>Although addressing the P0418 code doesn&rsquo;t always come with great urgency, it is still important to do so. Remember that exhaust emissions contribute to pollution in the atmosphere. Some of the common symptoms attributed to the code include:<\/p>\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=\"An illuminated check engine light\">An illuminated check engine light<\/a><\/li>\n\n\n\n<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>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0418 Code<\/h2>\n\n\n\n<p>DTC P0418 is a generic powertrain code, which means it can be logged on various vehicles. Keep in mind that the steps for diagnosis and repair can vary depending on the specific vehicle you own. For instance, diagnostic procedures for a P0418 code in a Toyota Tundra can be different from that for a P0418 code in a VW Jetta.<\/p>\n\n\n\n<p>If you&rsquo;re not confident with your DIY skills yet, it&rsquo;s a good idea to bring your vehicle to a mechanic to ensure that the right steps are being followed.<\/p>\n\n\n\n<p>Here is a video that shows 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 TACOMA CHECK ENGINE LIGHT: p0418, p2441, p2445 air injection pump quick diag\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/g_APfFuJZKY?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 P0418 Code<\/h2>\n\n\n\n<p>Attempting to fix a P0418 code isn&rsquo;t easy&mdash;especially if you&rsquo;re not equipped with the right tools and technical knowledge. If you&rsquo;re not familiar with exhaust systems and vehicle repair, you should take your vehicle to the nearest shop and have a certified mechanic do the job for you.&nbsp;If you plan on doing the job yourself, make sure to <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"do your research and read the manual before doing any repair work\">do your research and read the manual before doing any repair work<\/a>. Guides like those from Chilton or an ALLDATA subscription come with vehicle-specific repair information that will make the job easier.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Getting a New SAI Pump Relay for Your Vehicle<\/h2>\n\n\n\n<p>Triggering the P0418 code is just one of the many issues that a faulty SAI pump relay can cause. If the relay isn&rsquo;t working, then your SAI pump is likely to fail as well. This can cause rough idling, reduced engine performance, and a failed emissions test. Thankfully, you can save yourself from all that trouble by getting a new SAI pump relay from CarParts.com.<\/p>\n\n\n\n<p>At CarParts.com, you&rsquo;re sure to find the best aftermarket SAI pump relay for your vehicle. Our products are sourced from only the most trusted manufacturers in the industry, so you can truly get your money&rsquo;s worth. The best part is that we also offer a price match guarantee for every purchase. If you find a competitor advertising the same product at a lower price, let us know and we&rsquo;ll match or beat their price on the spot!<\/p>\n\n\n\n<p>Don&rsquo;t wait until you fail your next emissions test before getting a new SAI pump relay. Check out our selection of high-quality <a href=\"https:\/\/www.carparts.com\/secondary-air-injection-pump-relay\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"SAI pump relays\">SAI pump relays<\/a> at CarParts.com and order one today!<\/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>Modern vehicles are composed of different systems that work together to keep your ride running smoothly. The role of the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0418-code-secondary-air-injection-system-control-a-circuit\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":67585,"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":[1323,2064,2068],"ppma_author":[2607,2855],"class_list":{"0":"post-67581","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-pump","10":"tag-secondary-air-injection-pump-relay","11":"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>P0418 Code: Secondary Air Injection System Control &quot;A&quot; Circuit - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn more about the P0418 code, its causes, and the most common symptoms associated with it in this guide.\" \/>\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\/p0418-code-secondary-air-injection-system-control-a-circuit\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0418 Code: Secondary Air Injection System Control &quot;A&quot; Circuit - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn more about the P0418 code, its causes, and the most common symptoms associated with it in this guide.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0418-code-secondary-air-injection-system-control-a-circuit\/\" \/>\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=\"2022-03-15T07:48:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-08-16T12:29:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Automotive-New-Secondary-Air-Injection-Pump.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\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\\\/p0418-code-secondary-air-injection-system-control-a-circuit\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0418-code-secondary-air-injection-system-control-a-circuit\\\/\"},\"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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