{"id":1366,"date":"2025-09-25T04:35:48","date_gmt":"2025-09-25T04:35:48","guid":{"rendered":"https:\/\/www.way.com\/ask\/?p=1366"},"modified":"2025-09-25T04:37:50","modified_gmt":"2025-09-25T04:37:50","slug":"what-does-the-p3400-code-mean","status":"publish","type":"post","link":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/","title":{"rendered":"What does the P3400 code mean?\u00a0"},"content":{"rendered":"<p><b><span data-contrast=\"none\">Common causes of P3400 code<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">The code P3400 can be registered in your vehicle due to one or more of the following reasons:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"none\">Faulty cylinder deactivation solenoid <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Low level of oil <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Contaminated, degraded, or unsuitable engine oil <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Faulty, burnt, shorted, corroded, or disconnected wiring or electrical connectors <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Malfunctioning or unsuitable Mass Airflow Sensor or Intake Air Temperature Sensor <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Faulty or unsuitable Throttle Position Sensor <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">The lifters have poor oil pressure <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Faulty lifters <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">An open or short circuit in the cylinder deactivation solenoid connection <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">A faulty electrical connection in the cylinder deactivation solenoid circuit <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">A malfunctioning VVT (Variable Valve Timing) oil control solenoid <\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Failure of the PCM or another control module. Though it is an uncommon occurrence, it requires looking for the fault elsewhere before replacing any control module.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><b><span data-contrast=\"none\">Symptoms of P3400 code<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">Typical code P3400 symptoms are almost the same across all cars and may include one or more of the following:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"none\">Check engine light turns on\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Engine starts vibrating\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Engine performance goes down\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">A sharp increase in fuel consumption\u00a0\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">The engine may run rough or stall regularly and suddenly\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">The PCM may initiate a fail-safe or limp mode in some instances, which will last until the fault gets rectified<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><b><span data-contrast=\"none\">How to fix the P3400 code<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">It is almost impossible to fix this trouble code by yourself unless you are a skilled mechanic. If not, get some professional help who can properly diagnose and fix the issue for you. Here are some of the common repairs that can fix this code:<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"none\">Replacement of cylinder deactivation solenoid #1\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Replacement of cylinder deactivation solenoid #7\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Remove dirt and debris from cylinder deactivation solenoid oil passageways\u00a0\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Make lifter oil passageways free from dirt and debris\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Replacement of engine lifters\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">If dirt and mud cover the entire engine, it will be necessary to disassemble the entire engine to clean it properly<\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Common causes of P3400 code\u00a0 The code P3400 can be registered in your vehicle due to one or more of the following reasons:\u00a0 Faulty cylinder deactivation solenoid \u00a0 Low level of oil \u00a0 Contaminated, degraded, or unsuitable engine oil \u00a0 Faulty, burnt, shorted, corroded, or disconnected wiring or electrical connectors \u00a0 Malfunctioning or unsuitable Mass&hellip; <a class=\"more-link\" href=\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/\">Continue reading <span class=\"screen-reader-text\">What does the P3400 code mean?\u00a0<\/span><\/a><\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1366","post","type-post","status-publish","format-standard","hentry","category-car-repair-maintenance","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What does the P3400 code mean?\u00a0 - ask<\/title>\n<meta name=\"description\" content=\"What does the P3400 code mean? What are the causes and symptoms? Is the P3400 code serious? Know all about it!\" \/>\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.way.com\/ask\/what-does-the-p3400-code-mean\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What does the P3400 code mean?\u00a0 - ask\" \/>\n<meta property=\"og:description\" content=\"What does the P3400 code mean? What are the causes and symptoms? Is the P3400 code serious? Know all about it!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/\" \/>\n<meta property=\"og:site_name\" content=\"ask\" \/>\n<meta property=\"article:published_time\" content=\"2025-09-25T04:35:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-25T04:37:50+00:00\" \/>\n<meta name=\"author\" content=\"Gareth Newman\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Gareth Newman\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/\"},\"author\":{\"name\":\"Gareth Newman\",\"@id\":\"https:\/\/www.way.com\/ask\/#\/schema\/person\/418ef9e86ed6bfcb5b45b3cdac1ab9c9\"},\"headline\":\"What does the P3400 code mean?\u00a0\",\"datePublished\":\"2025-09-25T04:35:48+00:00\",\"dateModified\":\"2025-09-25T04:37:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/\"},\"wordCount\":311,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.way.com\/ask\/#organization\"},\"articleSection\":[\"Car Repair &amp; Maintenance\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/\",\"url\":\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/\",\"name\":\"What does the P3400 code mean?\u00a0 - ask\",\"isPartOf\":{\"@id\":\"https:\/\/www.way.com\/ask\/#website\"},\"datePublished\":\"2025-09-25T04:35:48+00:00\",\"dateModified\":\"2025-09-25T04:37:50+00:00\",\"description\":\"What does the P3400 code mean? What are the causes and symptoms? Is the P3400 code serious? Know all about it!\",\"breadcrumb\":{\"@id\":\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.way.com\/ask\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What does the P3400 code mean?\u00a0\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.way.com\/ask\/#website\",\"url\":\"https:\/\/www.way.com\/ask\/\",\"name\":\"ask\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.way.com\/ask\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.way.com\/ask\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.way.com\/ask\/#organization\",\"name\":\"ask\",\"url\":\"https:\/\/www.way.com\/ask\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.way.com\/ask\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.way.com\/ask\/wp-content\/uploads\/2024\/11\/logo-text.png\",\"contentUrl\":\"https:\/\/www.way.com\/ask\/wp-content\/uploads\/2024\/11\/logo-text.png\",\"width\":96,\"height\":37,\"caption\":\"ask\"},\"image\":{\"@id\":\"https:\/\/www.way.com\/ask\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.way.com\/ask\/#\/schema\/person\/418ef9e86ed6bfcb5b45b3cdac1ab9c9\",\"name\":\"Gareth Newman\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.way.com\/ask\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/9475312dfad46f7dabc15241d0f0be990aa26fb0202c2d0e2e470dc4834ff123?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/9475312dfad46f7dabc15241d0f0be990aa26fb0202c2d0e2e470dc4834ff123?s=96&d=mm&r=g\",\"caption\":\"Gareth Newman\"},\"url\":\"https:\/\/www.way.com\/ask\/author\/gareth-newman\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What does the P3400 code mean?\u00a0 - ask","description":"What does the P3400 code mean? What are the causes and symptoms? Is the P3400 code serious? Know all about it!","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/","og_locale":"en_US","og_type":"article","og_title":"What does the P3400 code mean?\u00a0 - ask","og_description":"What does the P3400 code mean? What are the causes and symptoms? Is the P3400 code serious? Know all about it!","og_url":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/","og_site_name":"ask","article_published_time":"2025-09-25T04:35:48+00:00","article_modified_time":"2025-09-25T04:37:50+00:00","author":"Gareth Newman","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Gareth Newman","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/#article","isPartOf":{"@id":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/"},"author":{"name":"Gareth Newman","@id":"https:\/\/www.way.com\/ask\/#\/schema\/person\/418ef9e86ed6bfcb5b45b3cdac1ab9c9"},"headline":"What does the P3400 code mean?\u00a0","datePublished":"2025-09-25T04:35:48+00:00","dateModified":"2025-09-25T04:37:50+00:00","mainEntityOfPage":{"@id":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/"},"wordCount":311,"commentCount":0,"publisher":{"@id":"https:\/\/www.way.com\/ask\/#organization"},"articleSection":["Car Repair &amp; Maintenance"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/","url":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/","name":"What does the P3400 code mean?\u00a0 - ask","isPartOf":{"@id":"https:\/\/www.way.com\/ask\/#website"},"datePublished":"2025-09-25T04:35:48+00:00","dateModified":"2025-09-25T04:37:50+00:00","description":"What does the P3400 code mean? What are the causes and symptoms? Is the P3400 code serious? Know all about it!","breadcrumb":{"@id":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.way.com\/ask\/what-does-the-p3400-code-mean\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.way.com\/ask\/"},{"@type":"ListItem","position":2,"name":"What does the P3400 code mean?\u00a0"}]},{"@type":"WebSite","@id":"https:\/\/www.way.com\/ask\/#website","url":"https:\/\/www.way.com\/ask\/","name":"ask","description":"","publisher":{"@id":"https:\/\/www.way.com\/ask\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.way.com\/ask\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.way.com\/ask\/#organization","name":"ask","url":"https:\/\/www.way.com\/ask\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.way.com\/ask\/#\/schema\/logo\/image\/","url":"https:\/\/www.way.com\/ask\/wp-content\/uploads\/2024\/11\/logo-text.png","contentUrl":"https:\/\/www.way.com\/ask\/wp-content\/uploads\/2024\/11\/logo-text.png","width":96,"height":37,"caption":"ask"},"image":{"@id":"https:\/\/www.way.com\/ask\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.way.com\/ask\/#\/schema\/person\/418ef9e86ed6bfcb5b45b3cdac1ab9c9","name":"Gareth Newman","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.way.com\/ask\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/9475312dfad46f7dabc15241d0f0be990aa26fb0202c2d0e2e470dc4834ff123?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9475312dfad46f7dabc15241d0f0be990aa26fb0202c2d0e2e470dc4834ff123?s=96&d=mm&r=g","caption":"Gareth Newman"},"url":"https:\/\/www.way.com\/ask\/author\/gareth-newman\/"}]}},"_links":{"self":[{"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/posts\/1366","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/comments?post=1366"}],"version-history":[{"count":2,"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/posts\/1366\/revisions"}],"predecessor-version":[{"id":1368,"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/posts\/1366\/revisions\/1368"}],"wp:attachment":[{"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/media?parent=1366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/categories?post=1366"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.way.com\/ask\/wp-json\/wp\/v2\/tags?post=1366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}