{"id":15460,"date":"2021-09-02T23:39:00","date_gmt":"2021-09-03T06:39:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=15460"},"modified":"2024-05-31T18:09:37","modified_gmt":"2024-06-01T01:09:37","slug":"code-p0405-exhaust-gas-recirculation-sensor-a-circuit-low","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/code-p0405-exhaust-gas-recirculation-sensor-a-circuit-low\/","title":{"rendered":"Code P0405: Exhaust Gas Recirculation Sensor A Circuit Low"},"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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_0df71e-ec > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_0df71e-ec > .kt-inside-inner-col,.kadence-column_0df71e-ec > .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_0df71e-ec > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_0df71e-ec > .kt-inside-inner-col{flex-direction:column;}.kadence-column_0df71e-ec > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_0df71e-ec > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_0df71e-ec{position:relative;}@media all and (max-width: 1024px){.kadence-column_0df71e-ec > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_0df71e-ec > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_0df71e-ec qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-8c3dcd  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-6d5c93\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_478552-5a, .wp-block-kadence-advancedheading.kt-adv-heading_478552-5a[data-kb-block=\"kb-adv-heading_478552-5a\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_478552-5a mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_478552-5a[data-kb-block=\"kb-adv-heading_478552-5a\"] 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_478552-5a img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_478552-5a[data-kb-block=\"kb-adv-heading_478552-5a\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_478552-5a summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_478552-5a\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>If your vehicle logs a P0405 code, it means that the voltage signals from the exhaust gas recirculation (EGR) valve are below the normal range.<\/li><li>A faulty EGR valve position sensor\/valve and circuit issues are most likely to trigger a P0405 trouble code.<\/li><li>If your vehicle logs this code, it will be at risk of failing its emissions test and exhibiting poor engine performance.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Vehicles keep nitrogen oxide (NOx) emission levels under control using exhaust gas recirculation (EGR) systems. When the sensor that monitors the position of the <a href=\"https:\/\/www.carparts.com\/egr-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR valve\">EGR valve<\/a> sends signals with lower voltage levels than normal, an OBD scan tool may register the code P0405.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0405 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) P0405 stands for &ldquo;Exhaust Gas Recirculation Sensor A Circuit Low.&rdquo; It denotes that the readings coming from the <a href=\"https:\/\/www.carparts.com\/egr-valve-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR valve position sensor\">EGR valve position sensor<\/a> show lower voltage levels than normal.<\/p>\n\n\n\n<p>As its name implies, the EGR position sensor detects the position of the EGR valve. The powertrain control module (PCM) uses the sensor signal to monitor and adjust EGR valve operation. If the signal from the sensor appears strangely low, the PCM may set a P0405 code.<\/p>\n\n\n\n<p>For more information, you may read our technical discussion about the <a href=\"https:\/\/www.carparts.com\/blog\/p0401-code-exhaust-gas-recirculation-egr-flow-insufficient-detected\/#An_In-Depth_Look_at_the_EGR_System\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR system\">EGR system<\/a>. If you&rsquo;re planning a DIY fix, you may also want to read about the <a href=\"https:\/\/www.carparts.com\/blog\/code-p0405-exhaust-gas-recirculation-sensor-a-circuit-low\/#EGR_Sensors_and_DPFE\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR sensor and Delta Pressure Feedback EGR (DPFE).\">EGR sensor and Delta Pressure Feedback EGR (DPFE).<\/a><\/p>\n\n\n\n<p>Continue reading to learn the possible causes of code P0405.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> Code P0316 is a generic code specified by the Society of Automotive Engineers (SAE). Depending on the car manufacturer, the code&rsquo;s definition may change.<\/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\/2020\/09\/automotive-egr-valve-1024x683.jpeg\" alt=\"automotive egr valve\" class=\"wp-image-15481\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/automotive-egr-valve-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/automotive-egr-valve-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/automotive-egr-valve-768x513.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/automotive-egr-valve-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/automotive-egr-valve-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/automotive-egr-valve.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>When your PCM detects that the readings coming from the EGR valve position sensor are lower than normal, it may trigger code P0405.<\/figcaption><\/figure>\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 Possible Causes of the P0405 Code?<\/h2>\n\n\n\n<p>You may get taken aback by the number of issues that can get the PCM to set an engine code P0405. Likely causes for this DTC include:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Faulty EGR valve position sensor or DPFE<\/li><li>Bad EGR valve<\/li><li>Circuit issues, such as damaged or chafing wires or poor connections <\/li><li>An issue with the PCM, such as software in need of an update <\/li><\/ul>\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\/09\/poor-fuel-economy-1024x683.jpeg\" alt=\"poor fuel economy\" class=\"wp-image-15480\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/poor-fuel-economy-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/poor-fuel-economy-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/poor-fuel-economy-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/poor-fuel-economy-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/poor-fuel-economy-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/poor-fuel-economy.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Poor fuel economy is a common symptom of code P0405.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0405 Code?<\/h2>\n\n\n\n<p>When the EGR valve position sensor stops working correctly, it can disrupt the vehicle&rsquo;s drivability. Warning signs of a code P0405 include:<\/p>\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>Failed emission test due to increased NOx emissions<\/li><li>Decreased engine performance<\/li><li>Engine pinging<\/li><li>Poor fuel economy<\/li><li>Engine stalling<\/li><\/ul>\n\n\n\n<p>Some vehicles won&rsquo;t show any obvious signs that their EGR valve position sensor has stopped working properly. If your scanner shows a P0405 code, bring your ride to the shop for diagnosis and repair.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0405 Code<\/h2>\n\n\n\n<p>The variations between EGR systems can make a code P0405 a challenge to diagnose and fix. You can learn what the troubleshooting process might involve by watching the videos below:<\/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=\"P0405 EGR Sensor A Circuit Low (failed DPFE sensor)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/GDfxNHsPLCU?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 EGR Flow Testing (P0401, P0402, P0405)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/pH_kjRwD-Xw?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 P0405 Code<\/h2>\n\n\n\n<p>Fixing the P0405 code involves pinpointing its exact cause and resolving it with consideration to your vehicle&rsquo;s make and model. Most DIYers tend to overlook the latter, mistakenly assuming that what works for one works for all.<\/p>\n\n\n\n<p>If you are not confident with your automotive know-how and repair skills, it may be best to let your mechanic fix the issue. Otherwise, feel free to tackle the engine code. Once you&rsquo;ve identified what triggered it, figure out the best way to fix it using <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 and guides\">online auto repair resources and guides<\/a>. Better yet, secure an ALLDATA single-vehicle subscription to get access to comprehensive factory repair information. <\/p>\n\n\n\n<p>Lastly, <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"double-check your owner&rsquo;s manual\">double-check your owner&rsquo;s manual<\/a> before implementing any repair process. Make sure the solution is not only the right fix for what triggered the engine code but also appropriate for your vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">EGR Sensors and DPFE<\/h2>\n\n\n\n<p>Early fuel injected Fords had a vacuum solenoid and a three wire linear EGR Valve Position (EVP) sensor that measured diaphragm movement. But monitoring pintle position doesn&rsquo;t prove EGR gas is flowing into the intake.<\/p>\n\n\n\n<p>GM vehicles (pre-OBD2) will watch O2 sensor activity while the ECM is commanding EGR flow, because O2 sensor readings will drift slightly rich when EGR is flowing due to the displacement of oxygen by the inert exhaust gas entering the intake.<\/p>\n\n\n\n<p>Pre-OBD2 Ford engineers developed a different feedback system, with a 3-wire pressure sensor that first appeared on <a href=\"https:\/\/www.carparts.com\/blog\/lincoln-town-car-reliability-and-common-problems\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Lincoln Town Cars\">Lincoln Town Cars<\/a> in 1991. That sensor has two silicone hoses connected to the EGR feed pipe with an orifice between the two hoses. Ford dubbed this the &ldquo;DPFE&rdquo; sensor, for Delta Pressure Feedback EGR. That system remained on OBD2-era Fords equipped with EGR.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Pre-OBD2 Ford engineers developed a different feedback system, with a 3 wire pressure sensor that first appeared on Lincoln Town Cars in 1991. That sensor has two silicone hoses connected to the EGR feed pipe with an orifice between the two hoses. Ford dubbed this the &ldquo;DPFE&rdquo; sensor, for Delta Pressure Feedback EGR. That system remained on OBD2 era Fords equipped with EGR.<\/p><cite>&ndash;<a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p>On the Ford, when EGR is flowing, the pressure will rise in the hose connected below the orifice in the EGR feed pipe and the pressure will drop in the hose connected above it, thus the sensor can determine if EGR is flowing and how much. This is a three-wire sensor (5V, Signal Return ground, and Signal). The signal wire on metal DPFE sensors rests at about 0.6 volts and on the plastic ones at about 1.0 volts.<\/p>\n\n\n\n<p>If this sensor voltage reads lower than the expected window, the <strong>P0405<\/strong> code is set.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get Replacement Parts for Your Vehicle<\/h2>\n\n\n\n<p>If your scan tool reads a P0405 code, you don&rsquo;t have to worry. <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a> has all the parts you need to get your vehicle back on the road again.<\/p>\n\n\n\n<p>We have a wide selection of replacement parts like <a href=\"https:\/\/www.carparts.com\/search?q=EGR_valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR valves\">EGR valves<\/a> and <a href=\"https:\/\/www.carparts.com\/search?q=EGR_valve_position_sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR valve position sensors\">EGR valve position sensors<\/a> sold at unbeatable prices. Just visit our website and use our vehicle selector tool to narrow down your search to the replacement parts that are compatible with your specific year, make, and model.<\/p>\n\n\n\n<p>Save big on repairs by shopping from our selection of parts that come with a low-price guarantee. We buy quality parts in bulk from today&rsquo;s top manufacturers so we can pass on the savings to you. Products are then handpicked by our team of industry experts to make sure only the best parts are shipped to you.<\/p>\n\n\n\n<p>You can contact our toll-free hotlines in case you have questions about your order. Check out our selection, and order 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\/egr-valve\" target=\"_blank\" aria-label=\"EGR 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\/repf509202_1\">\n<strong>EGR Valve<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/egr-valve-position-sensor\" target=\"_blank\" aria-label=\"EGR Valve Position 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\/sivp1_1\">\n<strong>EGR Valve Position Sensor<\/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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Vehicles keep nitrogen oxide (NOx) emission levels under control using exhaust gas recirculation (EGR) systems. When the sensor that monitors&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/code-p0405-exhaust-gas-recirculation-sensor-a-circuit-low\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":15482,"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":[361,1575],"ppma_author":[2607,2985],"class_list":{"0":"post-15460","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-egr-valve","9":"tag-egr-valve-position-sensor","10":"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>Code P0405: Exhaust Gas Recirculation Sensor A Circuit Low - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Code P0405 warns that the EGR valve position sensor sends signals with lower voltage levels than usual. 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\/code-p0405-exhaust-gas-recirculation-sensor-a-circuit-low\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Code P0405: Exhaust Gas Recirculation Sensor A Circuit Low - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Code P0405 warns that the EGR valve position sensor sends signals with lower voltage levels than usual. 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