{"id":75445,"date":"2022-10-13T02:14:43","date_gmt":"2022-10-13T09:14:43","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=75445"},"modified":"2023-09-19T01:34:59","modified_gmt":"2023-09-19T08:34:59","slug":"p3449-code-cylinder-7-deactivation-intake-valve-control-circuit-open","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p3449-code-cylinder-7-deactivation-intake-valve-control-circuit-open\/","title":{"rendered":"P3449 Code: Cylinder 7 Deactivation\/Intake Valve Control Circuit\/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-column_2316e5-fd > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_2316e5-fd > .kt-inside-inner-col,.kadence-column_2316e5-fd > .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_2316e5-fd > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_2316e5-fd > .kt-inside-inner-col{flex-direction:column;}.kadence-column_2316e5-fd > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_2316e5-fd > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_2316e5-fd{position:relative;}@media all and (max-width: 1024px){.kadence-column_2316e5-fd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_2316e5-fd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_2316e5-fd qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-b6da09  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-9b6937\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_18edae-c7, .wp-block-kadence-advancedheading.kt-adv-heading_18edae-c7[data-kb-block=\"kb-adv-heading_18edae-c7\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_18edae-c7 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_18edae-c7[data-kb-block=\"kb-adv-heading_18edae-c7\"] 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_18edae-c7 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_18edae-c7[data-kb-block=\"kb-adv-heading_18edae-c7\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_18edae-c7 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_18edae-c7\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The diagnostic trouble code (DTC) P3449 stands for &ldquo;Cylinder 7 Deactivation\/Intake Valve Control Circuit\/Open.&rdquo;<\/li><li>The powertrain control module (PCM) will trigger the P3449 code if it determines that the cylinder deactivation system on engine cylinder 7 has a problem.<\/li><li>Common causes of the P3449 code are a faulty cylinder #7 deactivation solenoid, restricted oil passages, and bad connectors.<\/li><li>A vehicle that sets the P3449 code can show symptoms like an illuminated check engine light, engine misfires, increased fuel consumption and wastage, and reduced engine performance.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The cylinder deactivation system turns off certain cylinders in the engine when they are not needed to produce more power, such as idling or cruising. By decreasing the number of cylinders that need fuel sprayed into them, the system improves fuel efficiency and reduces emissions.<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine control module\">engine control module<\/a> (ECM) or powertrain control module (PCM) will log a P3449 code if the cylinder deactivation system on engine cylinder 7 has a problem.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P3449 Code Mean?<\/h2>\n\n\n\n<p>The <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) P3449 indicates &ldquo;Cylinder 7 Deactivation\/Intake Valve Control Circuit\/Open.&rdquo; It applies to vehicles with engines that have eight or more cylinders.<\/p>\n\n\n\n<p>Deactivation\/intake valve control circuits are solenoids that can temporarily disable the <a href=\"https:\/\/www.carparts.com\/intake-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"intake valve\">intake valve<\/a> in their respective cylinder. They are vital to the cylinder deactivation system, which allows the engine to run with fewer cylinders than it usually uses. For example, a V8 engine can run in V4 mode, which produces less power and saves fuel.<\/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\/2022\/10\/car-with-v8-engine-visible-1024x682.jpg\" alt=\"car with v8 engine visible\" class=\"wp-image-75446\" width=\"1024\" height=\"682\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-with-v8-engine-visible-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-with-v8-engine-visible-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-with-v8-engine-visible-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-with-v8-engine-visible-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-with-v8-engine-visible-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-with-v8-engine-visible-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-with-v8-engine-visible-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/car-with-v8-engine-visible.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A V8 engine can run in V4 mode, which produces less power and saves fuel.<\/figcaption><\/figure>\n\n\n\n<p>The ECM or PCM controls the engine&rsquo;s 4-cylinder and 8-cylinder modes. It keeps track of the current load on the engine. When the engine load is light&ndash;such as when the vehicle is running idle or driving on a highway&ndash;the control will use the cylinder deactivation system to disable several cylinders.<\/p>\n\n\n\n<p>The PCM regularly checks the deactivation\/intake valve control circuits. If the controller determines that the intake valve for cylinder 7 isn&rsquo;t working properly, it will set the generic powertrain diagnostic code P3449.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code P3449 can differ according to the vehicle manufacturer. Check 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 P3449 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Faulty <a href=\"https:\/\/www.carparts.com\/cylinder-deactivation-solenoid\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"cylinder deactivation solenoid\">cylinder deactivation solenoid<\/a><\/li><li>Insufficient engine oil level or pressure<\/li><li>Restricted oil passage<\/li><li>Faulty or damaged wiring<\/li><li>Corroded, damaged, or loose connector<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Bad ECM\">Bad ECM<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P3449 Code?<\/h2>\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<ul class=\"wp-block-list\"><li>Engine misfire<\/li><li>Higher fuel consumption and wastage<\/li><li>Reduced engine performance<\/li><li>Check engine light illuminated<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P3449 Code<\/h2>\n\n\n\n<p>The P3449 code is a generic diagnostic code that various makes and models can log. Depending on factors like the vehicle&rsquo;s year, make, model, and powertrain, the process to evaluate and repair the underlying issue can change between cases. There is no single solution to every case.<\/p>\n\n\n\n<p>If you&rsquo;re not confident about conducting diagnostic tests on your vehicle, it&rsquo;s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P3449 Code<\/h2>\n\n\n\n<p>Attempting to fix a P3449 code can become a challenging task if you don&rsquo;t have the right tools and know-how to test the intake valves. In most cases, it&rsquo;s best to leave the job to professionals.<br>For DIYers with advanced technical knowledge and hands-on experience who prefer to test and replace their vehicle&rsquo;s faulty intake valve on their own, it will be helpful to rely on the appropriate <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or refer to an online repair database\">repair manual or refer to an online repair database<\/a>.<\/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>The cylinder deactivation system turns off certain cylinders in the engine when they are not needed to produce more power,&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p3449-code-cylinder-7-deactivation-intake-valve-control-circuit-open\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":75458,"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":[3589,1323,2171],"ppma_author":[2607,2855],"class_list":{"0":"post-75445","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-cylinder-deactivation-solenoid","9":"tag-engine-control-module-2","10":"tag-intake-valve","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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