{"id":67010,"date":"2022-02-28T00:56:58","date_gmt":"2022-02-28T08:56:58","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=67010"},"modified":"2024-12-19T05:15:53","modified_gmt":"2024-12-19T13:15:53","slug":"p0685-code-ecm-pcm-power-relay-control-circuit-open","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0685-code-ecm-pcm-power-relay-control-circuit-open\/","title":{"rendered":"P0685 Code: ECM \/ PCM Power Relay Control Circuit Open"},"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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column67010_db28af-e9 > .kt-inside-inner-col,.kadence-column67010_db28af-e9 > .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-column67010_db28af-e9 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column67010_db28af-e9 > .kt-inside-inner-col{flex-direction:column;}.kadence-column67010_db28af-e9 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column67010_db28af-e9 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column67010_db28af-e9{position:relative;}@media all and (max-width: 1024px){.kadence-column67010_db28af-e9 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column67010_db28af-e9 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column67010_db28af-e9 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-305921  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-c85245\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading67010_571e8b-e2, .wp-block-kadence-advancedheading.kt-adv-heading67010_571e8b-e2[data-kb-block=\"kb-adv-heading67010_571e8b-e2\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading67010_571e8b-e2 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading67010_571e8b-e2[data-kb-block=\"kb-adv-heading67010_571e8b-e2\"] 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-heading67010_571e8b-e2 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading67010_571e8b-e2[data-kb-block=\"kb-adv-heading67010_571e8b-e2\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading67010_571e8b-e2 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading67010_571e8b-e2\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Diagnostic trouble code (DTC) P0685 stands for ECM \/ PCM Power Relay Control Circuit Open.&rdquo;<\/li>\n\n\n\n<li>The powertrain control module (PCM) will set this trouble code when the voltage signal from the relay indicates that the circuit is open at the wrong time.<\/li>\n\n\n\n<li>The P0685 code usually gets logged because of an issue with the PCM, its power relay, or associated electrical wiring.<\/li>\n\n\n\n<li>If the check engine light illuminates or the engine either gets a hard start or cannot start at all, your vehicle might have an issue that sets the P0685 code.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>A dedicated power relay (electronic switch) manages the voltage flowing to the PCM, keeping it supplied with enough power to run the powertrain.<\/p>\n\n\n\n<p>If the PCM notices that the voltage signal from the relay indicates that the circuit is open when it shouldn&rsquo;t be, a P0685 fault code will be stored.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0685 Code Mean?<\/h2>\n\n\n\n<p>The <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) P0685 stands for &ldquo;ECM\/PCM Power Relay Control Circuit Open.&rdquo;<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/blog\/web-stories\/auto-chip-shortage\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> regularly checks the voltage condition in the power relay control circuit that delivers battery voltage to the ECM\/PCM. If the computer sees a low-voltage or no-voltage condition in the circuit, it will set the powertrain code P0685.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Note on Power Relay Circuits and Codes Like P0685<\/h3>\n\n\n\n<p>The ECM\/PCM Power relay circuits aren&rsquo;t always wired the same way. In order for the ECM\/PCM to determine that there is an issue with the power relay, there must be power to the ECM\/PCM from the ignition switch to wake up parts of the processor first.<\/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<style>.kadence-column67010_dbbc43-f4 > .kt-inside-inner-col,.kadence-column67010_dbbc43-f4 > .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-column67010_dbbc43-f4 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column67010_dbbc43-f4 > .kt-inside-inner-col{flex-direction:column;}.kadence-column67010_dbbc43-f4 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column67010_dbbc43-f4 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column67010_dbbc43-f4{position:relative;}@media all and (max-width: 1024px){.kadence-column67010_dbbc43-f4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column67010_dbbc43-f4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column67010_dbbc43-f4 kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id67010_2d920c-dd > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id67010_2d920c-dd > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id67010_2d920c-dd > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;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)));}.kb-row-layout-id67010_2d920c-dd > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id67010_2d920c-dd .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id67010_2d920c-dd .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id67010_2d920c-dd .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id67010_2d920c-dd .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id67010_2d920c-dd .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id67010_2d920c-dd .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id67010_2d920c-dd > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id67010_2d920c-dd .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id67010_2d920c-dd .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id67010_2d920c-dd > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id67010_2d920c-dd .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id67010_2d920c-dd .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id67010_2d920c-dd alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col{display:flex;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col{min-height:45px;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col,.kadence-column67010_b9e8ac-26 > .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-column67010_b9e8ac-26 > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > *, .kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column67010_b9e8ac-26{position:relative;}@media all and (max-width: 1024px){.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > *, .kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > *, .kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column67010_b9e8ac-26 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column67010_b9e8ac-26 kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image67010_c1d283-44.kb-image-is-ratio-size, .kb-image67010_c1d283-44 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image67010_c1d283-44.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image67010_c1d283-44 .kb-image-is-ratio-size{align-self:unset;}.kb-image67010_c1d283-44 figure{max-width:45px;}.kb-image67010_c1d283-44 .image-is-svg, .kb-image67010_c1d283-44 .image-is-svg img{width:100%;}.kb-image67010_c1d283-44 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image67010_c1d283-44\"><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-column67010_1c3b37-55 > .kt-inside-inner-col,.kadence-column67010_1c3b37-55 > .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-column67010_1c3b37-55 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column67010_1c3b37-55 > .kt-inside-inner-col{flex-direction:column;}.kadence-column67010_1c3b37-55 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column67010_1c3b37-55 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column67010_1c3b37-55{position:relative;}@media all and (max-width: 1024px){.kadence-column67010_1c3b37-55 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column67010_1c3b37-55 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column67010_1c3b37-55 inner-column-2 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>\nOlder systems typically received ignition switch power to the relay coil, the other side of which was hardwired to ground. Chrysler&rsquo;s Auto Shutdown relay system was configured somewhat differently from its inception.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<p>On Fords, the power relay not only powers up the ECM\/PCM, it also powers up all the actuators, which are typically controlled via ground signals from the module.<\/p>\n\n\n\n<p>But on later model Fords, if for some reason the power relay remains energized with the key off due to a stuck relay or shorted relay coil feed, code P0685 will be set. The Ford system expects the ECM\/PCM to go to sleep when the relay is commanded open (off), and if the ECM\/PCM is still powered up, it sets this code.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"817\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-ford-1024x817.jpg\" alt=\"p0685 code ford\" class=\"wp-image-81083\" style=\"width:1024px;height:817px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-ford-1024x817.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-ford-300x239.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-ford-768x613.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-ford-150x120.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-ford.jpg 1498w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">In this Ford example, the BCM includes a field effect transistor the BCM uses to &ldquo;wake up&rdquo; the ECM\/PCM. After which, the ECM\/PCM energized the PCM power relay coil, turning on the two terminals at the PCM. What this means is that it&rsquo;s not always an open circuit that sets code P0685; sometimes, it&rsquo;s a short circuit, which is the opposite of an open. | Image Source: Richard McCuistian.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-gm-1024x549.jpg\" alt=\"p0685 code gm\" class=\"wp-image-81084\" style=\"width:1024px;height:549px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-gm-1024x549.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-gm-300x161.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-gm-768x412.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-gm-150x80.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/02\/p0685-code-gm.jpg 1498w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">This GM example, compared to the Ford example, illustrates the subtle differences in the way different OEMs wire their systems. | Image Source: Richard McCuistian.<\/figcaption><\/figure>\n\n\n\n<p>On platforms that simply check the relay coil, the fused power that comes in the top of the relay coil travels through the coil and is measured at the ECM\/PCM whenever the relay isn&rsquo;t energized. If there is no ground being delivered through the coil, that open circuit can trigger code P0685. If, however, the coil measures properly (12 when not energized and 0 volts energized), but there is no voltage delivered to the ECM\/PCM, the code will be set for that reason.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>On platforms that simply check the relay coil, the fused power that comes in the top of the relay coil travels through the coil and is measured at the ECM\/PCM whenever the relay isn&rsquo;t energized. If there is no ground being delivered through the coil, that open circuit can trigger code P0685.<\/p>\n<cite><em>&ndash;&nbsp;<\/em><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>Not all platforms have P0685 in their libraries, and the ECM\/PCM power scheme is somewhat different on every platform.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code P0685 can differ according to the vehicle manufacturer. Check 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 P0685 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faulty PCM<\/li>\n\n\n\n<li>Bad <a href=\"https:\/\/www.carparts.com\/engine-control-module-relay\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM power relay\">PCM power relay<\/a><\/li>\n\n\n\n<li>Problem with the PCM&rsquo;s electrical wiring<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0685 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Check engine light is illuminated\">Check engine light is illuminated<\/a><\/li>\n\n\n\n<li>Engine is unable to start up<\/li>\n\n\n\n<li>Engine exhibits hard starts or cannot start up during cold weather<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0685 Code<\/h2>\n\n\n\n<p>The P0685 code is a powertrain code. It applies to OBD-II-compliant vehicles that use a relay to power the ECM\/PCM with voltage from the battery.<\/p>\n\n\n\n<p>If you&rsquo;re not confident about conducting diagnostic tests on your vehicle&rsquo;s ECM\/PCM power relay, it&rsquo;s a good idea to bring your ride to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here are some videos that will give you an idea of what the process might involve:<\/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=\"How To Test Relays- EricTheCarGuy\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/DWmt6gorzUg?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 P0685 Code<\/h2>\n\n\n\n<p>Trying to fix a PP0685 code can become frustrating in short order if you don&rsquo;t have the right equipment and experience to test the engine\/<a href=\"https:\/\/www.carparts.com\/powertrain-control-module-relay\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module power relay\">powertrain control module power relay<\/a>. In most cases, it&rsquo;s best to leave the job to professionals.<\/p>\n\n\n\n<p>If you&rsquo;re a DIYer who possesses advanced technical knowledge and hands-on experience, you can test and replace your vehicle&rsquo;s ECM\/PCM power relay on your own. It will be helpful to rely on the appropriate <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or refer to an online repair database\">repair manual or refer to an online repair database<\/a>.<\/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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>A dedicated power relay (electronic switch) manages the voltage flowing to the PCM, keeping it supplied with enough power to&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0685-code-ecm-pcm-power-relay-control-circuit-open\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":67012,"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":[1323],"ppma_author":[2607,2985],"class_list":{"0":"post-67010","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":"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>P0685 Code: ECM \/ PCM Power Relay Control Circuit Open - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what the P0685 code means, its possible causes, common symptoms, as well as what to do if you get it on your scanner. 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