{"id":85111,"date":"2023-06-08T17:56:39","date_gmt":"2023-06-09T00:56:39","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=85111"},"modified":"2023-10-19T06:29:03","modified_gmt":"2023-10-19T13:29:03","slug":"p1456-code-evaporative-emissions-control-system-leakage-fuel-tank","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p1456-code-evaporative-emissions-control-system-leakage-fuel-tank\/","title":{"rendered":"P1456 Code: Evaporative Emissions Control System Leakage Fuel Tank"},"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_2793a3-9f > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_2793a3-9f > .kt-inside-inner-col,.kadence-column_2793a3-9f > .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_2793a3-9f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_2793a3-9f > .kt-inside-inner-col{flex-direction:column;}.kadence-column_2793a3-9f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_2793a3-9f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_2793a3-9f{position:relative;}@media all and (max-width: 1024px){.kadence-column_2793a3-9f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_2793a3-9f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_2793a3-9f qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-074e28  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-66a868\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_0c4438-15, .wp-block-kadence-advancedheading.kt-adv-heading_0c4438-15[data-kb-block=\"kb-adv-heading_0c4438-15\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_0c4438-15 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_0c4438-15[data-kb-block=\"kb-adv-heading_0c4438-15\"] 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_0c4438-15 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_0c4438-15[data-kb-block=\"kb-adv-heading_0c4438-15\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_0c4438-15 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_0c4438-15\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Diagnostic trouble code (DTC) P1456 stands for &ldquo;Evaporative Emissions Control System Leakage Fuel Tank.&rdquo; The code is activated when the powertrain control module (PCM) detects a minor leak in the evaporative emissions control (EVAP) system.<\/li><li>The P1456 code can be caused by a missing or faulty fuel filter cap, a malfunctioning EVAP two-way valve, a bad EVAP bypass solenoid valve, or a broken EVAP canister.&nbsp;<\/li><li>Vehicles with a triggered P1456 code can show symptoms like an illuminated check engine light and emit fuel smells.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>It&rsquo;s crucial to monitor the condition of your <a href=\"https:\/\/www.carparts.com\/blog\/evaporative-emission-control-evap-system-101-the-basics\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"evaporative emissions control (EVAP) system\">evaporative emissions control (EVAP) system<\/a> because it ensures that fuel vapors from the fuel tank don&rsquo;t leak out. Like most vehicle systems, it isn&rsquo;t immune to faults.<\/p>\n\n\n\n<p>P1456 is a trouble code related to a leak in your EVAP system.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P1456 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) P1456 stands for &ldquo;Evaporative Emissions Control System Leakage Fuel Tank.&rdquo;<\/p>\n\n\n\n<p>The code is set once the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> (PCM) detects a minor leak in the EVAP system.<\/p>\n\n\n\n<p>Modern vehicles usually have a &ldquo;leak detection method&rdquo; incorporated in their EVAP system. This helps the PCM identify faults and leaks within the system accurately and easily.<\/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\/2023\/06\/car-evap-canister-part-of-evap-control-system-1024x602.jpg\" alt=\"car evap canister part of evap control system\" class=\"wp-image-85113\" width=\"1024\" height=\"602\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-evap-canister-part-of-evap-control-system-1024x602.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-evap-canister-part-of-evap-control-system-300x176.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-evap-canister-part-of-evap-control-system-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-evap-canister-part-of-evap-control-system-1536x904.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-evap-canister-part-of-evap-control-system-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-evap-canister-part-of-evap-control-system.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The EVAP canister side covers the area from the EVAP two-way valve to the purge valve.<\/figcaption><\/figure>\n\n\n\n<p>To make it easier, the EVAP control system is divided into two: the EVAP canister and the tank. The <a href=\"https:\/\/www.carparts.com\/vapor-canister\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EVAP canister\">EVAP canister<\/a> side covers the area from the EVAP two-way valve to the <a href=\"https:\/\/www.carparts.com\/purge-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"purge valve\">purge valve<\/a>. Meanwhile, the tank side refers to the area from the EVAP two-way valve on the way to the <a href=\"https:\/\/www.carparts.com\/fuel-tank\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel tank\">fuel tank<\/a>.<\/p>\n\n\n\n<p>The leak detection process usually comes in two levels and with different thresholds. Once the PCM detects a minor leak based on the data provided in the leak detection process, it&rsquo;ll trigger the P1456 code.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of the P1456 code can 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 P1456 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Missing <a href=\"https:\/\/www.carparts.com\/oil-filler-cap\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel filler cap\">fuel filler cap<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/bad-gas-cap-symptoms\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Debris in the fuel filler cap\">Debris in the fuel filler cap<\/a><\/li><li>Malfunctioning EVAP two-way valve<\/li><li>Bad EVAP bypass solenoid valve<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/what-does-a-vapor-canister-do\/#Symptoms_of_a_Bad_EVAP_Canister\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty EVAP canister\">Faulty EVAP canister<\/a><\/li><li>Fuel filler cap is stuck open<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Symptoms of the P1456 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><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><li>Fuel-like smell<\/li><\/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\">How to Diagnose the P1456 Code<\/h2>\n\n\n\n<p>The P1456 code can be triggered on various makes and models but there is no universal way to diagnose and clear it. Vehicle systems can be structured differently depending on the auto manufacturer.<\/p>\n\n\n\n<p>If you&rsquo;re not sure how to diagnose the issue, it&rsquo;s best to take your vehicle to an auto repair shop for a proper diagnosis. If you&rsquo;re an experienced DIYer, you can go ahead and do it yourself.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P1456 Code<\/h2>\n\n\n\n<p>Resolving a P1456 error code is not easy, especially if you don&rsquo;t have adequate knowledge on the EVAP system. If that&rsquo;s the case, your best option is to let a licensed mechanic address the issue for you.<\/p>\n\n\n\n<p>If you&rsquo;re a seasoned DIYer who&rsquo;s up for the challenge, make sure you have the right repair guide before you get started. Vehicle-specific guides from resources like Chilton or an ALLDATA subscription might have the information you need to clear this trouble code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">More About EVAP Systems and OBD2<\/h2>\n\n\n\n<p>Evaporative systems have been around since about 1970 when California began to require them on vehicles sold in that state. But until OBD2 became standard on all passenger cars in 1996, there was no way (other than smell) to determine whether hydrocarbon vapors were leaking from the fuel tank.<\/p>\n\n\n\n<p>OBD2 systems launched a way of monitoring evaporative emissions systems so that eventually every vehicle emission system is required to detect even the smallest leak in the EVAP system.<\/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\/2023\/07\/evap-system-diagram-1024x622.jpg\" alt=\"diagram of an evap system\" class=\"wp-image-87672\" width=\"1024\" height=\"622\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/evap-system-diagram-1024x622.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/evap-system-diagram-300x182.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/evap-system-diagram-768x466.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/evap-system-diagram-150x91.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/evap-system-diagram.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>This diagram shows how a basic EVAP system works but there are variations among manufacturers. During leak detection, the vent solenoid is closed electrically and the purge solenoid delivers a weak vacuum to the tank and canister. The tank pressure sensor input is monitored while both solenoids are locked closed, trapping the vacuum in the system. If the pressure rises more than a certain amount during the programmed time interval, a code will be set and the technician will use a smoke machine to locate the leak. | Image Source: Richard McCuistian<\/figcaption><\/figure>\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>It&rsquo;s crucial to monitor the condition of your evaporative emissions control (EVAP) system because it ensures that fuel vapors from&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p1456-code-evaporative-emissions-control-system-leakage-fuel-tank\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":85114,"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":[1323,1198,1234,1235,1663],"ppma_author":[2607,2985],"class_list":{"0":"post-85111","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-fuel-tank-2","10":"tag-oil-filler-cap","11":"tag-purge-valve","12":"tag-vapor-canister","13":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P1456 Code: Evaporative Emissions Control System Leakage Fuel Tank - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"P1456 is a trouble code related to a leak in your EVAP system. Find out what it means and its triggers in this article.\" \/>\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\/p1456-code-evaporative-emissions-control-system-leakage-fuel-tank\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P1456 Code: Evaporative Emissions Control System Leakage Fuel Tank - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"P1456 is a trouble code related to a leak in your EVAP system. 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