{"id":11003,"date":"2021-07-30T00:57:00","date_gmt":"2021-07-30T07:57:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=11003"},"modified":"2024-06-03T15:43:39","modified_gmt":"2024-06-03T22:43:39","slug":"p0457-code-evaporative-emission-system-leak-detected-fuel-cap-loose-off","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0457-code-evaporative-emission-system-leak-detected-fuel-cap-loose-off\/","title":{"rendered":"P0457 Code: Evaporative Emission System Leak Detected (Fuel Cap Loose\/Off)"},"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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_6c2186-d8 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_6c2186-d8 > .kt-inside-inner-col,.kadence-column_6c2186-d8 > .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_6c2186-d8 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_6c2186-d8 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_6c2186-d8 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_6c2186-d8 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_6c2186-d8{position:relative;}@media all and (max-width: 1024px){.kadence-column_6c2186-d8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_6c2186-d8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_6c2186-d8 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-39d640  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-3efa8c\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_754eb4-30, .wp-block-kadence-advancedheading.kt-adv-heading_754eb4-30[data-kb-block=\"kb-adv-heading_754eb4-30\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_754eb4-30 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_754eb4-30[data-kb-block=\"kb-adv-heading_754eb4-30\"] 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_754eb4-30 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_754eb4-30[data-kb-block=\"kb-adv-heading_754eb4-30\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_754eb4-30 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_754eb4-30\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P0457 code stands for &ldquo;Evaporative Emission System Leak Detected (Fuel Cap Loose\/Off)&rdquo;, which means your power control module (PCM) has detected a leak in your evaporative emission control system (EVAP).<\/li><li>A cracked gas cap, damaged seal, and a broken fuel filler neck are some of the possible causes of the P0457 code.<\/li><li>Some symptoms related to the P0457 code include an illuminated check engine light and the smell of fuel.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>If your OBD-II scanner indicates a code P0457, address the issue with the help of this comprehensive guide.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0457 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) P0457 stands for &ldquo;Evaporative Emission System Leak Detected (Fuel Cap Loose\/Off).&rdquo; The code indicates that your car&rsquo;s primary computer, which is often referred to as the powertrain control module (PCM), has detected a large leak in the EVAP system. This leak is often caused by a loose or missing <a href=\"https:\/\/www.carparts.com\/gas-cap\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel cap\">fuel cap<\/a>.<\/p>\n\n\n<style>.kadence-column_467ef5-70 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_467ef5-70 > .kt-inside-inner-col,.kadence-column_467ef5-70 > .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_467ef5-70 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_467ef5-70 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_467ef5-70 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_467ef5-70 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_467ef5-70{position:relative;}@media all and (max-width: 1024px){.kadence-column_467ef5-70 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_467ef5-70 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_467ef5-70 kb-section-dir-vertical kb-section-sm-dir-vertical pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>#kt-layout-id_ec71f0-f8 > .kt-row-column-wrap{align-content:start;}:where(#kt-layout-id_ec71f0-f8 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}#kt-layout-id_ec71f0-f8 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:var( --global-kb-row-default-top, 25px );padding-bottom:var( --global-kb-row-default-bottom, 25px );padding-top:20px;padding-bottom:20px;padding-left:16px;padding-right:32px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}#kt-layout-id_ec71f0-f8 > .kt-row-layout-overlay{opacity:0.00;}#kt-layout-id_ec71f0-f8 .kt-row-layout-bottom-sep{height:100px;}#kt-layout-id_ec71f0-f8 .kt-row-layout-bottom-sep svg{width:100%;}#kt-layout-id_ec71f0-f8 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}#kt-layout-id_ec71f0-f8 .kt-row-layout-top-sep{height:100px;}#kt-layout-id_ec71f0-f8 .kt-row-layout-top-sep svg{width:100%;}#kt-layout-id_ec71f0-f8 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){#kt-layout-id_ec71f0-f8 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){#kt-layout-id_ec71f0-f8 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){#kt-layout-id_ec71f0-f8 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){#kt-layout-id_ec71f0-f8 > .kt-row-column-wrap{padding-top:28px;padding-bottom:25px;padding-left:16px;padding-right:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}#kt-layout-id_ec71f0-f8 .kt-row-layout-bottom-sep{height:px;}#kt-layout-id_ec71f0-f8 .kt-row-layout-bottom-sep svg{width:%;}}<\/style>\n<div class=\"wp-block-kadence-rowlayout alignnone pro-tip-wrap\"><div id=\"kt-layout-id_ec71f0-f8\" class=\"kt-row-layout-inner kt-layout-id_ec71f0-f8\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-gutter-none kt-v-gutter-default kt-row-valign-top kt-row-layout-right-golden kt-tab-layout-right-golden kt-m-colapse-left-to-right kt-mobile-layout-right-golden  kt-custom-first-width-10  kt-custom-second-width-90\"><style>.kadence-column_e2e047-9c > .kt-inside-inner-col{display:flex;}.kadence-column_e2e047-9c > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_e2e047-9c > .kt-inside-inner-col,.kadence-column_e2e047-9c > .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_e2e047-9c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column_e2e047-9c > .kt-inside-inner-col > *, .kadence-column_e2e047-9c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_e2e047-9c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_e2e047-9c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column_e2e047-9c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_e2e047-9c{position:relative;}@media all and (max-width: 1024px){.kadence-column_e2e047-9c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column_e2e047-9c > .kt-inside-inner-col > *, .kadence-column_e2e047-9c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_e2e047-9c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_e2e047-9c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column_e2e047-9c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column_e2e047-9c > .kt-inside-inner-col > *, .kadence-column_e2e047-9c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_e2e047-9c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_e2e047-9c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_e2e047-9c kb-section-dir-horizontal kb-section-md-dir-horizontal pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image_7c3884-73.kb-image-is-ratio-size, .kb-image_7c3884-73 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image_7c3884-73.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image_7c3884-73 .kb-image-is-ratio-size{align-self:unset;}.kb-image_7c3884-73 figure{max-width:45px;}.kb-image_7c3884-73 .image-is-svg, .kb-image_7c3884-73 .image-is-svg img{width:100%;}.kb-image_7c3884-73 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image_7c3884-73\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column_1648e0-74 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_1648e0-74 > .kt-inside-inner-col,.kadence-column_1648e0-74 > .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_1648e0-74 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_1648e0-74 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_1648e0-74 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_1648e0-74 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_1648e0-74{position:relative;}@media all and (max-width: 1024px){.kadence-column_1648e0-74 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_1648e0-74 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-2 kadence-column_1648e0-74 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\n            Newer systems check the EVAP system for leaks. If they find no leak and then notice the fuel level has changed followed by a large leak, logic dictates that you left your fuel cap off. Some vehicles actually have a special warning light on the instrument cluster for this. Typically when you see a P0457 code it means the ECM\/PCM has noticed a higher fuel level and a new leak. Check the fuel cap first if you get this code.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p0442-evaporative-emission-control-system-leak-detected-small-leak\/\" target=\"_self\" rel=\"dofollow\" class=\"u19a5653e31a5354152f04572bf4e5f5c\"><style> .u19a5653e31a5354152f04572bf4e5f5c { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .u19a5653e31a5354152f04572bf4e5f5c:active, .u19a5653e31a5354152f04572bf4e5f5c:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u19a5653e31a5354152f04572bf4e5f5c { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u19a5653e31a5354152f04572bf4e5f5c .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u19a5653e31a5354152f04572bf4e5f5c .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u19a5653e31a5354152f04572bf4e5f5c:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P0442 Code: Evaporative Emission Control System Leak Detected (Small Leak)<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> Although code P0457 is a generic code specified by the Society of Automotive Engineers (SAE), the code&rsquo;s definition may be different depending on the vehicle manufacturer.<\/em><\/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\/2021\/07\/driver-holding-the-gas-cap-of-a-car-to-check-it-1024x682.jpg\" alt=\"driver holding the gas cap of a car to check it\" class=\"wp-image-42250\" width=\"1024\" height=\"682\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/driver-holding-the-gas-cap-of-a-car-to-check-it-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/driver-holding-the-gas-cap-of-a-car-to-check-it-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/driver-holding-the-gas-cap-of-a-car-to-check-it-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/driver-holding-the-gas-cap-of-a-car-to-check-it-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/driver-holding-the-gas-cap-of-a-car-to-check-it-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/driver-holding-the-gas-cap-of-a-car-to-check-it-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/driver-holding-the-gas-cap-of-a-car-to-check-it.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Typically when you see a P0457 code, it means the ECM\/PCM has noticed a higher fuel level and a new leak. Check the fuel cap first if you get this code.<\/figcaption><\/figure>\n\n\n\n<p>Related codes include <a href=\"https:\/\/www.carparts.com\/blog\/p0455-code-evaporative-emission-system-large-leak-detected\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P0455\">P0455<\/a> and <a href=\"https:\/\/www.carparts.com\/blog\/p0456-code-evaporative-emission-system-small-leak-detected\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P0456\">P0456<\/a>, which indicate minor and moderate EVAP leaks, respectively.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What Does the EVAP System Do?<\/h3>\n\n\n\n<p>The evaporative emission control system (EVAP) keeps fuel vapor from escaping into the atmosphere.<\/p>\n\n\n\n<p>A typical EVAP system features the following primary components:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The <a href=\"https:\/\/www.carparts.com\/fuel-tank\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel tank\">fuel tank<\/a><\/li><li>The gas cap<\/li><li>A <a href=\"https:\/\/www.carparts.com\/fuel-pressure-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"pressure sensor\">pressure sensor<\/a> that measures the pressure in the fuel tank<\/li><li>A <a href=\"https:\/\/www.carparts.com\/purge-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"charcoal canister\">charcoal canister<\/a> that captures the fuel vapor<\/li><li>A <a href=\"https:\/\/www.carparts.com\/purge-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"purge valve\">purge valve<\/a><\/li><li>A <a href=\"https:\/\/www.carparts.com\/fuel-tank-vent-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vent valve\">vent valve<\/a> that closes during system testing<\/li><li>Hoses and lines that connect the system together<\/li><\/ul>\n\n\n\n<p>The focal point of the EVAP system is the charcoal canister&mdash;a component that stores the fuel vapors when the engine is off.<\/p>\n\n\n\n<p>When the engine is running and conditions are correct, the PCM opens a device called the purge valve. This allows the vapors to be drawn into the engine, where they are burned as part of the normal combustion process.<\/p>\n\n\n\n<p>Vehicles built after 1996 have what&rsquo;s referred to as an &ldquo;enhanced evaporative emissions control system.&rdquo; With this design, the PCM can test the EVAP system for both purge flow and system leakage. When the module detects a leak, it issues a diagnostic trouble code.<\/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\/2020\/06\/man-tightening-car-gas-cap-1024x683.jpeg\" alt=\"Man tightening car's gas cap\" class=\"wp-image-11007\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/man-tightening-car-gas-cap-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/man-tightening-car-gas-cap-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/man-tightening-car-gas-cap-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/man-tightening-car-gas-cap-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/man-tightening-car-gas-cap.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A loose gas cap is one potential source of an EVAP system leak.<\/figcaption><\/figure>\n\n\n\n<p>A loose gas cap is one potential source of an EVAP system leak. If the cap does not seal properly against the filler neck, fuel vapors will escape into the atmosphere.<\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/emission-control-systems\/\" target=\"_self\" rel=\"dofollow\" class=\"ud466df259950b48ce441126e8008d646\"><style> .ud466df259950b48ce441126e8008d646 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .ud466df259950b48ce441126e8008d646:active, .ud466df259950b48ce441126e8008d646:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .ud466df259950b48ce441126e8008d646 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .ud466df259950b48ce441126e8008d646 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .ud466df259950b48ce441126e8008d646 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .ud466df259950b48ce441126e8008d646:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">Emission Control Systems<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>Many vehicles can check whether refueling has taken place by monitoring parameters, such as the ignition switch and fuel level. If the PCM detects an EVAP system leak shortly after refueling, it assumes the gas cap was left loose and sets code P0457.<\/p>\n\n\n\n<p>The code can also be triggered by a large leak somewhere else in the EVAP system.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0457 Code?<\/h2>\n\n\n\n<p>The PCM issues a code P0457 in response to a large leak in the EVAP. Fuel vapor can escape from the system in several ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Gas cap is cracked, loose, or got dislodged and went missing<\/li><li>Dirt and foreign objects on the gas cap&rsquo;s threading broke the seal<\/li><li>Exposure to the elements or sheer age eroded the hose&rsquo;s material, causing it to crack, loosen, or rot<\/li><li>Damaged fuel filler neck<\/li><li>A leak somewhere else in the EVAP system<\/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\">What are the Common Symptoms of the P0457 Code?<\/h2>\n\n\n\n<p>Typically, the only symptom associated with code P0457 is an illuminated check engine light. You may also <a href=\"https:\/\/www.carparts.com\/blog\/why-does-my-car-smell-like-gas\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"smell fuel\">smell fuel<\/a>.<\/p>\n\n\n\n<p><strong><em>Note: <\/em><\/strong><em>If there are other codes stored in addition to P0457, the causes and symptoms may differ from those listed here.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0457 Code<\/h2>\n\n\n\n<p>If you encounter code P0457, the first thing you want to do is tighten the gas cap, clear the code with a scan tool or code reader, and see if it returns. You may need to replace the gas cap if it&rsquo;s damaged or not forming a good seal.<\/p>\n\n\n\n<p>In most cases, tightening or replacing the gas cap will solve the problem. However, it&rsquo;s possible for a leak somewhere else in the EVAP system to trigger code P0457. If that is the case, you&rsquo;ll need to do some troubleshooting.<\/p>\n\n\n\n<p>Here are a couple of videos to give you an idea of what the diagnostic process may entail:<\/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=\"Multiple Ford Vehicles 2009+ Evap System Leak Codes P0456 P0457 P1450\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/qR0Dm7IqgNA?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<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=\"Ford Code P0455 P0457  - Ford Escape Check Fuel Fill Inlet Message\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Ss00nvQKZkQ?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 P0457 Code<\/h2>\n\n\n\n<p>As was mentioned, you may be able to get rid of code P0457 by simply tightening or replacing the gas cap. But if that doesn&rsquo;t help, you&rsquo;ll need to do some troubleshooting (or have a professional do the troubleshooting for you) to determine the cause of the EVAP leak.<\/p>\n\n\n\n<p>Keep in mind that all vehicles are different. For example, the solution to a P0457 code in a Ford may not be entirely the same as the fix for a P0457 in a Subaru. When troubleshooting and repairing diagnostic trouble codes, make sure to consult the factory repair information for your application.<\/p>\n\n\n\n<p>Repair manuals, such as those from Chilton, are useful, but an ALLDATA subscription is even better. ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a New Gas Cap to Clear the P0457Code<\/h2>\n\n\n\n<p>Driving around with a set P0457 code is not a good idea. While the only symptoms are an illuminated check engine light and the smell of fuel, they could be precursors to other issues. As such, it&rsquo;s best to deal with the problem directly. If you&rsquo;ve determined that getting a new <a href=\"https:\/\/www.carparts.com\/gas-cap\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"gas cap\">gas cap<\/a> will clear the code, you can find what you need in no time at <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>Thanks to your strategically located warehouses across the country, you can get your new gas cap delivered to your doorstep in as fast as two business days if you order before noon. On top of that, all our products come with a low-price and lifetime replacement guarantee to give you the best value for your money.<\/p>\n\n\n\n<p>It&rsquo;s also easy to find a compatible gas cap replacement using our vehicle selector. Input your car&rsquo;s year, make, and model to narrow down the catalog to direct-fit caps. Use our search filters to show the list based on your preferred brand, price range, quantity, and more.<\/p>\n\n\n\n<p>Check out our catalog and get the best deals on gas caps today!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n<!-- start of editable content -->\n\n<a href=\"https:\/\/www.carparts.com\/gas-cap\" target=\"_blank\" aria-label=\"Gas Cap\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/st10412_1\">\n<strong>Gas Cap<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/fuel-tank\" target=\"_blank\" aria-label=\"Fuel Tank\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/arbc670103_1\">\n<strong>Fuel Tank<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/fuel-pressure-sensor\" target=\"_blank\" aria-label=\"Fuel Pressure Sensor\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/rn54360001_1\">\n<strong>Fuel Pressure Sensor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/purge-valve\" target=\"_blank\" aria-label=\"Purge Valve\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_290,w_290,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/ri38430001_1\">\n<strong>Purge Valve<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/fuel-tank-vent-valve\" target=\"_blank\" aria-label=\"Fuel Tank Vent Valve\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repb381901_1\">\n<strong>Fuel Tank Vent Valve<\/strong>\n<\/a>\n\n<!-- end of editable content -->\n\n<\/div>\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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>If your OBD-II scanner indicates a code P0457, address the issue with the help of this comprehensive guide. What Does&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0457-code-evaporative-emission-system-leak-detected-fuel-cap-loose-off\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":11006,"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":[416,1692,1685,1253,1235],"ppma_author":[2607,2985],"class_list":{"0":"post-11003","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-fuel-tank","9":"tag-fuel-tank-pressure-sensor","10":"tag-fuel-tank-vent-valve","11":"tag-gas-cap","12":"tag-purge-valve","13":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0457 Code: Evaporative Emission System Leak Detected (Fuel Cap Loose\/Off) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Does your OBD-II scanner show the P0457 code? Learn what it means, its possible causes, common symptoms, and how to address 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.carparts.com\/blog\/p0457-code-evaporative-emission-system-leak-detected-fuel-cap-loose-off\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0457 Code: Evaporative Emission System Leak Detected (Fuel Cap Loose\/Off) - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Does your OBD-II scanner show the P0457 code? Learn what it means, its possible causes, common symptoms, and how to address it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0457-code-evaporative-emission-system-leak-detected-fuel-cap-loose-off\/\" \/>\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=\"2021-07-30T07:57:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-03T22:43:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/closeup-of-car-fuel-cap.jpeg\" \/>\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=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0457-code-evaporative-emission-system-leak-detected-fuel-cap-loose-off\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0457-code-evaporative-emission-system-leak-detected-fuel-cap-loose-off\\\/\"},\"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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