{"id":45982,"date":"2021-11-17T22:51:10","date_gmt":"2021-11-18T06:51:10","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=45982"},"modified":"2024-08-19T23:44:48","modified_gmt":"2024-08-20T06:44:48","slug":"p3400-code-cylinder-deactivation-system-bank-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p3400-code-cylinder-deactivation-system-bank-1\/","title":{"rendered":"P3400 Code: Cylinder Deactivation System Bank 1"},"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-column45982_e17743-30 > .kt-inside-inner-col,.kadence-column45982_e17743-30 > .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-column45982_e17743-30 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column45982_e17743-30 > .kt-inside-inner-col{flex-direction:column;}.kadence-column45982_e17743-30 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column45982_e17743-30 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column45982_e17743-30{position:relative;}@media all and (max-width: 1024px){.kadence-column45982_e17743-30 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column45982_e17743-30 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column45982_e17743-30 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-5f7bc8  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-c79284\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading45982_f70203-65, .wp-block-kadence-advancedheading.kt-adv-heading45982_f70203-65[data-kb-block=\"kb-adv-heading45982_f70203-65\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading45982_f70203-65 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading45982_f70203-65[data-kb-block=\"kb-adv-heading45982_f70203-65\"] 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-heading45982_f70203-65 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading45982_f70203-65[data-kb-block=\"kb-adv-heading45982_f70203-65\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading45982_f70203-65 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading45982_f70203-65\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The powertrain control module (PCM) will register a P3400 trouble code when the cylinder fails to deactivate upon the computer&rsquo;s command.<\/li>\n\n\n\n<li>This code is set because of low oil pressure\/level, faulty valve timing control solenoid\/s, and shorted deactivation circuits.<\/li>\n\n\n\n<li>If this code is present, your vehicle can exhibit symptoms like decreased fuel economy, poor engine performance, and logged misfire-related codes.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Have you noticed a sudden decrease in your vehicle&rsquo;s engine performance? You&rsquo;ll need to use an OBD-II scanner to get a better understanding of your vehicle&rsquo;s issues. One of the diagnostic trouble codes you might encounter is P3400. Here&rsquo;s everything you need to know about code P3400.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P3400 Code Mean?<\/h2>\n\n\n\n<p>P3400 is the diagnostic trouble code for &ldquo;Cylinder Deactivation System Bank 1.&rdquo; A P3400 code indicates that your vehicle&rsquo;s powertrain control module (PCM) perceives a potential problem with your cylinder deactivation system bank 1. Vehicles that commonly have this fault are <a href=\"https:\/\/www.carparts.com\/honda\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Honda\">Honda<\/a>, <a href=\"https:\/\/www.carparts.com\/dodge\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Dodge\">Dodge<\/a>, <a href=\"https:\/\/www.carparts.com\/ram\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Ram\">Ram<\/a>, <a href=\"https:\/\/www.carparts.com\/gmc\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"GMC\">GMC<\/a>, <a href=\"https:\/\/www.carparts.com\/chevrolet\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Chevrolet\">Chevrolet<\/a>, <a href=\"https:\/\/www.carparts.com\/chrysler\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Chrysler\">Chrysler<\/a>, and <a href=\"https:\/\/www.carparts.com\/pontiac\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Pontiac\">Pontiac<\/a>.&nbsp;<\/p>\n\n\n\n<p>A P3400 code indicates that your vehicle&rsquo;s powertrain control module (PCM) perceives a potential problem with your cylinder deactivation system bank 1. Bank 1 refers to the engine bank that contains the number one cylinder. The location of the number one cylinder is different for some makes and models. It&rsquo;s best to <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"consult your vehicle&rsquo;s repair manual\">consult your vehicle&rsquo;s repair manual<\/a> for the location of your number one cylinder. Other diagnostic codes may be present alongside P3400 in some cases.<\/p>\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\/2021\/11\/cylinder-head-of-a-car-1024x683.jpg\" alt=\"cylinder head of a car\" class=\"wp-image-46118\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/cylinder-head-of-a-car-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/cylinder-head-of-a-car-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/cylinder-head-of-a-car-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/cylinder-head-of-a-car-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/cylinder-head-of-a-car-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/cylinder-head-of-a-car.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The P3400 code indicates that your vehicle&rsquo;s PCM perceives a potential problem with your cylinder deactivation system bank 1.<\/figcaption><\/figure>\n\n\n\n<p>Code P3400 reflects the results of a rationality check performed by the PCM each time the cylinder deactivation is engaged. Airflow, throttle angle, and engine speed should reflect a calibrated difference. If the PCM engages cylinder deactivation but the rationality check indicates cylinder deactivation didn&rsquo;t happen, code P3400 is set.<\/p>\n\n\n\n<p>For just one example, GM describes the P3400 condition as: <em>MAF Sensor \/ MAP Sensor \/ Throttle Position not within the calibrated range with Cylinder Deactivation System Active.<\/em><\/p>\n\n\n\n<p><em><strong>Note<\/strong>: &nbsp;The definition of P3400: Cylinder Deactivation System Bank 1 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.&nbsp;<\/em><\/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<h2 class=\"wp-block-heading\">What are Possible Causes of P3400?<\/h2>\n\n\n\n<p>Several factors can trigger the P3400 code. Here are some of the most common causes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine oil level or pressure is low<\/li>\n\n\n\n<li>Faulty <a href=\"https:\/\/www.carparts.com\/variable-timing-solenoid\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"valve timing control solenoid\/s\">valve timing control solenoid\/s<\/a>&nbsp;<\/li>\n\n\n\n<li>Cylinder deactivation circuit\/s may be open or shorted<\/li>\n\n\n\n<li>Defective PCM or PCM programming error<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P3400 Code?<\/h2>\n\n\n\n<p>If your PCM is storing a P3400 code, your vehicle may show some of the following symptoms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Illuminated warning lights (e.g. <a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light\">check engine light<\/a>)<\/li>\n\n\n\n<li>Reduced fuel efficiency<\/li>\n\n\n\n<li>Decreased <a href=\"https:\/\/www.carparts.com\/blog\/car-engine-parts\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine\">engine<\/a> performance&nbsp;<\/li>\n\n\n\n<li>Other cylinder deactivation codes&nbsp;<\/li>\n\n\n\n<li>Engine misfire codes<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"718\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/valve-timing-solenoid-1024x718.jpg\" alt=\"valve timing solenoid\" class=\"wp-image-46119\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/valve-timing-solenoid-1024x718.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/valve-timing-solenoid-300x210.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/valve-timing-solenoid-768x539.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/valve-timing-solenoid-150x105.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/valve-timing-solenoid.jpg 1508w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Faulty valve timing control solenoid\/s can trigger the code P3400.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P3400 Code<\/h2>\n\n\n\n<p>The P3400 code must be resolved as soon as possible to avoid complications down the line. We recommend having a professional mechanic check your vehicle if you don&rsquo;t have the required auto repair experience and skills. However, if you want to diagnose the code yourself, we&rsquo;ve included an informational video down below to help you get started.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P3400 Code<\/h2>\n\n\n\n<p>There&rsquo;s no magic bullet for resolving <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD-II trouble codes\">OBD-II trouble codes<\/a> because the recommended fixes are different for every make and model. Hiring a professional mechanic to diagnose and fix your P3400 code may be the best course of action if you don&rsquo;t have any auto repair experience.<\/p>\n\n\n\n<p>However, if you want to flex your DIY muscles, you should first look up the most common P4300 code problems for your specific vehicle. A repair manual or database may contain the information you need to determine the underlying causes for your P3400 code. There are plenty of <a href=\"https:\/\/www.carparts.com\/blog\/best-online-resources-to-help-you-learn-how-to-fix-cars\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"online auto repair resources\">online auto repair resources<\/a> available to help you fix your diagnostic trouble codes. We recommend subscribing to ALLDATA for your diagnostic repair needs.<\/p>\n\n\n\n<p>Keep in mind that different car manufacturers have their own set of repair instructions for their vehicles. What works for a <a href=\"https:\/\/www.carparts.com\/honda\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Honda\">Honda<\/a> may not work for a <a href=\"https:\/\/www.carparts.com\/pontiac\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Pontiac\">Pontiac<\/a>. To avoid mistakes, stick to your vehicle&rsquo;s repair manual when diagnosing trouble codes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Other Notes About P3400<\/h3>\n\n\n\n<p>A set code doesn&rsquo;t necessarily imply that a specific part is defective. For example, P3400: Cylinder Deactivation System Bank 1 doesn&rsquo;t always indicate an issue with the cylinder deactivation system.<\/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>Have you noticed a sudden decrease in your vehicle&rsquo;s engine performance? You&rsquo;ll need to use an OBD-II scanner to get&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p3400-code-cylinder-deactivation-system-bank-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":46117,"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":[3354],"ppma_author":[2607,2985],"class_list":{"0":"post-45982","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-car-engine-all-articles","9":"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>P3400 Code: Cylinder Deactivation System Bank 1 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn all about the P3400 code, its symptoms, possible causes, and how to diagnose it in this article. Read on for more info.\" \/>\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\/p3400-code-cylinder-deactivation-system-bank-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P3400 Code: Cylinder Deactivation System Bank 1 - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn all about the P3400 code, its symptoms, possible causes, and how to diagnose it in this article. 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