{"id":77950,"date":"2022-11-14T18:00:01","date_gmt":"2022-11-15T02:00:01","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=77950"},"modified":"2024-12-19T05:20:58","modified_gmt":"2024-12-19T13:20:58","slug":"p0689-code-ecm-pcm-power-relay-sensor-circuit-low","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0689-code-ecm-pcm-power-relay-sensor-circuit-low\/","title":{"rendered":"P0689 Code: ECM\/PCM Power Relay Sensor 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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column77950_9c723a-2d > .kt-inside-inner-col,.kadence-column77950_9c723a-2d > .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-column77950_9c723a-2d > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column77950_9c723a-2d > .kt-inside-inner-col{flex-direction:column;}.kadence-column77950_9c723a-2d > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column77950_9c723a-2d > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column77950_9c723a-2d{position:relative;}@media all and (max-width: 1024px){.kadence-column77950_9c723a-2d > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column77950_9c723a-2d > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column77950_9c723a-2d inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-453b2c  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-a1938d\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading77950_4518e8-03, .wp-block-kadence-advancedheading.kt-adv-heading77950_4518e8-03[data-kb-block=\"kb-adv-heading77950_4518e8-03\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading77950_4518e8-03 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading77950_4518e8-03[data-kb-block=\"kb-adv-heading77950_4518e8-03\"] 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-heading77950_4518e8-03 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading77950_4518e8-03[data-kb-block=\"kb-adv-heading77950_4518e8-03\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading77950_4518e8-03 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading77950_4518e8-03\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DTC P0689 stands for &ldquo;ECM\/PCM Power Relay Sensor Circuit Low,&rdquo; and this is logged when the PCM detects low voltage in the power relay sense circuit.<\/li>\n\n\n\n<li>Code P0689 is often caused by a malfunctioning PCM relay, circuit issues, and a blown fuse.<\/li>\n\n\n\n<li>The most common symptoms of code P0689 include driving issues, malfunctioning electric accessories, and a &ldquo;no start&rdquo; condition.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Modern vehicles are equipped with multiple systems that work together to ensure your vehicle runs smoothly. These systems rely on <a href=\"https:\/\/www.carparts.com\/blog\/when-were-vehicles-first-equipped-with-computers\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"computers\">computers<\/a> like the powertrain control module (PCM) or <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"electronic control module\">electronic control module<\/a> (ECM) to direct them and keep track of their functions.<\/p>\n\n\n\n<p>Like any other computer system, a vehicle&rsquo;s ECM and PCM can malfunction due to many reasons. P0689 is an error code related to a fault in the ECM or PCM&rsquo;s power relay sensor circuit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0689 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) P0689 stands for &ldquo;ECM\/PCM Power Relay Sensor Circuit Low.&rdquo; The code is set once your vehicle&rsquo;s computer detects a possible problem with the relay that supplies it with voltage.<\/p>\n\n\n\n<p>The PCM is in charge of controlling the powertrain, which includes the engine and transmission. It keeps track of parameters like engine speed, coolant temperature, and throttle position. The device also regulates outputs for the fuel injectors and ignition coils.&nbsp; It receives data from all these components in the form of voltage signals.<\/p>\n\n\n\n<p>If the PCM detects a low voltage condition on the power relay sense circuit, it will store the code P0689 code.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">P0689 on a <a href=\"https:\/\/www.carparts.com\/vehicle\/2017\/Chevrolet\/Camaro\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"2017 Chevrolet Camaro\">2017 Chevrolet Camaro<\/a>:<\/h3>\n\n\n\n<p>This is the description of the P0689 code from a 2017 Camaro:<\/p>\n\n\n\n<p>There are 2&thinsp;ignition voltage circuits supplied to the ECM.<\/p>\n\n\n\n<p>One is supplied by the engine controls ignition relay, and the other is supplied by the ignition main relay.<\/p>\n\n\n\n<p>The ECM monitors and compares the ignition voltage supplied by the two&thinsp;relays. Conditions for setting the code are as follows:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The engine controls ignition relay is commanded ON.<\/li>\n\n\n\n<li>Ignition&thinsp;1 signal voltage is greater than 11&thinsp;Volts.<\/li>\n\n\n\n<li>The engine controls ignition relay voltage at the ECM is not present or is very low.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Ignition Main Relay Diagram<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"986\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/illustration-of-ignition-main-relay-waking-up-pcm-1024x986.jpg\" alt=\"illustration of ignition main relay waking up pcm\" class=\"wp-image-77952\" style=\"width:1024px;height:986px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/illustration-of-ignition-main-relay-waking-up-pcm-1024x986.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/illustration-of-ignition-main-relay-waking-up-pcm-300x289.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/illustration-of-ignition-main-relay-waking-up-pcm-768x740.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/illustration-of-ignition-main-relay-waking-up-pcm-150x144.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/illustration-of-ignition-main-relay-waking-up-pcm.jpg 1499w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">In the circuit shown in this diagram, the ignition main relay &ldquo;wakes up&rdquo; the ECM, which then grounds the ignition controls relay coil, sending power to the ignition coils and to a separate circuit in the ECM. These two feeds are compared, and should match. If the Controls Relay isn&rsquo;t delivering voltage to the ECM, code P0689 is set. Note that there are a few different ways these systems are wired, and the example shown here is only one of the possible configurations. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0689 might 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<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 Causes of the P0689 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Malfunctioning PCM relay<\/li>\n\n\n\n<li>Circuit issues between the relay and <a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a><\/li>\n\n\n\n<li>Blown <a href=\"https:\/\/www.carparts.com\/blog\/car-fuse-facts-what-you-need-to-know-about-automotive-fuses\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuse\">fuse<\/a> or fusible link<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Symptoms of the P0689 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Possible &ldquo;<a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"no start\">no start<\/a>&rdquo; condition\/delayed start<\/li>\n\n\n\n<li>Malfunctioning electric accessories<\/li>\n\n\n\n<li>Driveability issues<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose a P0689 Code<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"523\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-encounters-p0689-code-1024x523.jpg\" alt=\"mechanic encounters p0689 code\" class=\"wp-image-77954\" style=\"width:1024px;height:523px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-encounters-p0689-code-1024x523.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-encounters-p0689-code-300x153.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-encounters-p0689-code-768x392.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-encounters-p0689-code-1536x784.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-encounters-p0689-code-150x77.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/mechanic-encounters-p0689-code.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">P0689 is a generic code, but that doesn&rsquo;t mean that there&rsquo;s a universal solution for all affected vehicles.<\/figcaption><\/figure>\n\n\n\n<p>P0689 is a generic code, but that doesn&rsquo;t mean that there&rsquo;s a universal solution for all affected vehicles. Remember that vehicles can be structured differently depending on their manufacturer. If you&rsquo;re not familiar with the PCM and vehicle repair in general, we recommend taking your vehicle to a trusted mechanic for proper diagnosis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0689 Code<\/h2>\n\n\n\n<p>Repairing a P0689 trouble code can be difficult, especially if you lack the necessary skills and tools. If you are not an experienced auto DIYer, it may be best to take a trip to a reputable repair shop near you.<\/p>\n\n\n\n<p>If you really want to fix the code yourself, we recommend consulting a repair manual or subscribing to an online repair database. These manuals contain information specific to your vehicle.<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Modern vehicles are equipped with multiple systems that work together to ensure your vehicle runs smoothly. These systems rely on&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0689-code-ecm-pcm-power-relay-sensor-circuit-low\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":77955,"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-77950","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>P0689 Code: ECM\/PCM Power Relay Sensor Circuit Low - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what a P0689 code means and the most common causes and symptoms behind it 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\/p0689-code-ecm-pcm-power-relay-sensor-circuit-low\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0689 Code: ECM\/PCM Power Relay Sensor Circuit Low - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what a P0689 code means and the most common causes and symptoms behind it in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0689-code-ecm-pcm-power-relay-sensor-circuit-low\/\" \/>\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=\"2022-11-15T02:00:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-12-19T13:20:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/ecm-pcm-of-a-car-close-up.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1837\" \/>\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=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0689-code-ecm-pcm-power-relay-sensor-circuit-low\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0689-code-ecm-pcm-power-relay-sensor-circuit-low\\\/\"},\"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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