{"id":71322,"date":"2022-08-09T23:05:19","date_gmt":"2022-08-10T06:05:19","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=71322"},"modified":"2023-08-31T22:43:44","modified_gmt":"2023-09-01T05:43:44","slug":"p0688-code-ecm-pcm-power-relay-sense-circuit-open","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/","title":{"rendered":"P0688 Code: ECM \/ PCM Power Relay Sense 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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_8181ba-cf > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_8181ba-cf > .kt-inside-inner-col,.kadence-column_8181ba-cf > .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_8181ba-cf > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_8181ba-cf > .kt-inside-inner-col{flex-direction:column;}.kadence-column_8181ba-cf > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_8181ba-cf > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_8181ba-cf{position:relative;}@media all and (max-width: 1024px){.kadence-column_8181ba-cf > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_8181ba-cf > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_8181ba-cf qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-c5e48a  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-ede599\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_0ec12b-d0, .wp-block-kadence-advancedheading.kt-adv-heading_0ec12b-d0[data-kb-block=\"kb-adv-heading_0ec12b-d0\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_0ec12b-d0 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_0ec12b-d0[data-kb-block=\"kb-adv-heading_0ec12b-d0\"] 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_0ec12b-d0 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_0ec12b-d0[data-kb-block=\"kb-adv-heading_0ec12b-d0\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_0ec12b-d0 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_0ec12b-d0\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Diagnostic trouble code (DTC) P0688 stands for &ldquo;ECM\/PCM Power Relay Sense Circuit Open.&rdquo; It&rsquo;s logged when the powertrain control module (PCM) detects an issue in the relay that gives it power from the battery (or the fuel injectors and ignition coils power from the battery). This can indicate a problem with the relay or its circuit.<\/li><li>Possible causes of the P0688 code include a defective PCM power relay, a faulty PCM, and a blown fuse or fusible link.<\/li><li>Some symptoms of the P0688 code include an illuminated check engine light, the vehicle refusing to start, and the vehicle stalling.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Is your vehicle having problems? Use a scan tool to check if your vehicle has any stored <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"trouble codes\">trouble codes<\/a> so you can find the exact problem. If you see the P0688 code, read on to learn more about its definition, common causes, and common symptoms.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0688 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0688 stands for ECM\/PCM Power Relay Sense Circuit Open. A stored P0688 code can indicate that the powertrain control module (PCM) has detected an issue in the relay that gives it power from the <a href=\"https:\/\/www.carparts.com\/battery\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"battery\">battery<\/a> (or the <a href=\"https:\/\/www.carparts.com\/fuel-injector\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel injectors\">fuel injectors<\/a> and <a href=\"https:\/\/www.carparts.com\/ignition-coil\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ignition coils\">ignition coils<\/a> power from the battery). In this case, it could mean there&rsquo;s a problem with the relay or its circuit.<\/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\/2022\/08\/automotive-power-relay-1024x683.jpg\" alt=\"automotive power relay\" class=\"wp-image-71344\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/automotive-power-relay-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/automotive-power-relay-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/automotive-power-relay-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/automotive-power-relay-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/automotive-power-relay-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/automotive-power-relay.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A stored P0688 code indicates that the PCM has detected an issue with the relay that gives it power from either the battery (or the fuel injectors and ignition coils power from the battery).<\/figcaption><\/figure>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of the P0688 code can be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of the P0688 Code<\/h2>\n\n\n\n<p>The P0688 code can be caused by:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>A defective PCM power relay<\/li><li>Faulty PCM<\/li><li>Blown fuse or fusible link<\/li><li>A circuit problem, such as a damaged <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wire\">wire<\/a> or poor connection<\/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 P0688 Code<\/h2>\n\n\n\n<p>When triggered, the P0688 can show the following symptoms:<\/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>The <a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vehicle refuses to start\">vehicle refuses to start<\/a><\/li><li>The <a href=\"https:\/\/www.carparts.com\/blog\/car-shuts-off-while-driving-causes-what-to-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vehicle stalls\">vehicle stalls<\/a><\/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\/2022\/08\/blown-relay-of-a-car-1024x683.jpg\" alt=\"blown relay of a car\" class=\"wp-image-71345\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/blown-relay-of-a-car-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/blown-relay-of-a-car-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/blown-relay-of-a-car-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/blown-relay-of-a-car-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/blown-relay-of-a-car-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/blown-relay-of-a-car.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A blown fuse can trigger the code P0688.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0688 Code<\/h2>\n\n\n\n<p>While the definition of the P0688 code implies that the issue is PCM-related, this is not always the case. To resolve this DTC, you must first identify the root cause. This might need a visual inspection of the concerned components. This job could also require the use of specific tools that are not readily available to you. If you&rsquo;re new to DIY repairs, we recommend consulting with a professional mechanic.<\/p>\n\n\n\n<p>Do you want to learn how to diagnose the issue on your own? The video below 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=\"2005 Durango P0688 Diagnosis\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/lkbRIzBYOCQ?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 P0688 Code<\/h2>\n\n\n\n<p>When it comes to addressing OBD-II codes, there isn&rsquo;t a single solution that will surely fix the issue. You must first diagnose the problem accurately in order to determine the best course of action.<\/p>\n\n\n\n<p>Once you&rsquo;ve figured out the cause of the P0688 issue, then you can seek solutions from <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=\"credible internet repair resources and how-to guides\">credible internet repair resources and how-to guides<\/a>.<\/p>\n\n\n\n<p>You can refer to Chilton repair manuals, or you can try an ALLDATA subscription, which provides detailed factory repair information.<\/p>\n\n\n\n<p>If you don&rsquo;t have much expertise in diagnosing or correcting error codes, it&rsquo;s advisable to consult a professional mechanic.<\/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>Is your vehicle having problems? Use a scan tool to check if your vehicle has any stored trouble codes so&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":71340,"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":[],"ppma_author":[2607,2855],"class_list":{"0":"post-71322","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"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>P0688 Code: ECM \/ PCM Power Relay Sense Circuit Open - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Wondering what&#039;s the meaning of the P0688 code, its common causes and symptoms? Read this article to find out.\" \/>\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\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0688 Code: ECM \/ PCM Power Relay Sense Circuit Open - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Wondering what&#039;s the meaning of the P0688 code, its common causes and symptoms? Read this article to find out.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/\" \/>\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=\"2022-08-10T06:05:19+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-01T05:43:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-obd-scan-tool.jpg\" \/>\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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com&#039;s thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.\",\"knowsAbout\":\"Auto Repair, Car Maintenance, Auto Parts, Car Reviews\",\"publishingPrinciples\":\"\\\/blog\\\/our-team\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/thecpteam\\\/\",\"sameAs\":\"https:\\\/\\\/www.facebook.com\\\/carpartscom, https:\\\/\\\/twitter.com\\\/CarPartscom, https:\\\/\\\/www.youtube.com\\\/@CarPartscomOfficial\\\/, https:\\\/\\\/www.instagram.com\\\/carpartscom\\\/\"},{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"William Guzenski\",\"jobTitle\":\"ASE Master Automobile Technician\",\"description\":\"William \u201cBill\u201d Guzenski has produced hundreds of how-to videos for the automotive community. He\u2019s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.\",\"knowsAbout\":\"Auto Repair, Car Maintenance, Auto Parts, Car Reviews\",\"publishingPrinciples\":\"\\\/blog\\\/our-team\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/author\\\/williamguzenski\\\/\",\"sameAs\":\"\"}],\"headline\":\"P0688 Code: ECM \\\/ PCM Power Relay Sense Circuit Open\",\"datePublished\":\"2022-08-10T06:05:19+00:00\",\"dateModified\":\"2023-09-01T05:43:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/\"},\"wordCount\":585,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/08\\\/car-obd-scan-tool.jpg\",\"articleSection\":[\"OBD-II Trouble Codes\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/\",\"name\":\"P0688 Code: ECM \\\/ PCM Power Relay Sense Circuit Open - In The Garage with CarParts.com\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/08\\\/car-obd-scan-tool.jpg\",\"datePublished\":\"2022-08-10T06:05:19+00:00\",\"dateModified\":\"2023-09-01T05:43:44+00:00\",\"description\":\"Wondering what's the meaning of the P0688 code, its common causes and symptoms? Read this article to find out.\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/08\\\/car-obd-scan-tool.jpg\",\"contentUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/08\\\/car-obd-scan-tool.jpg\",\"width\":1500,\"height\":1000,\"caption\":\"car obd scan tool\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/\",\"name\":\"In The Garage with CarParts.com\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#organization\",\"name\":\"CarParts.com\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/cp-itg-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/cp-itg-logo.png\",\"width\":2048,\"height\":398,\"caption\":\"CarParts.com\"},\"image\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/carpartscom\",\"https:\\\/\\\/x.com\\\/carpartscom\",\"https:\\\/\\\/www.instagram.com\\\/carpartscom\",\"https:\\\/\\\/www.youtube.com\\\/@CarPartscomOfficial\\\/\"]},{\"@type\":\"Person\",\"@id\":\"\",\"url\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"P0688 Code: ECM \/ PCM Power Relay Sense Circuit Open - In The Garage with CarParts.com","description":"Wondering what's the meaning of the P0688 code, its common causes and symptoms? Read this article to find out.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/","og_locale":"en_US","og_type":"article","og_title":"P0688 Code: ECM \/ PCM Power Relay Sense Circuit Open - In The Garage with CarParts.com","og_description":"Wondering what's the meaning of the P0688 code, its common causes and symptoms? Read this article to find out.","og_url":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/","og_site_name":"In The Garage with CarParts.com","article_publisher":"https:\/\/www.facebook.com\/carpartscom","article_published_time":"2022-08-10T06:05:19+00:00","article_modified_time":"2023-09-01T05:43:44+00:00","og_image":[{"width":1500,"height":1000,"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-obd-scan-tool.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_creator":"@carpartscom","twitter_site":"@carpartscom","twitter_misc":{"Written by":"","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/#article","isPartOf":{"@id":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/"},"author":[{"@type":"Person","$id":"4","name":"CarParts.com Research Team","jobTitle":"Expert Automotive Writer","description":"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com&#039;s thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.","knowsAbout":"Auto Repair, Car Maintenance, Auto Parts, Car Reviews","publishingPrinciples":"\/blog\/our-team\/","url":"https:\/\/www.carparts.com\/blog\/author\/thecpteam\/","sameAs":"https:\/\/www.facebook.com\/carpartscom, https:\/\/twitter.com\/CarPartscom, https:\/\/www.youtube.com\/@CarPartscomOfficial\/, https:\/\/www.instagram.com\/carpartscom\/"},{"@type":"Person","$id":"4","name":"William Guzenski","jobTitle":"ASE Master Automobile Technician","description":"William \u201cBill\u201d Guzenski has produced hundreds of how-to videos for the automotive community. He\u2019s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.","knowsAbout":"Auto Repair, Car Maintenance, Auto Parts, Car Reviews","publishingPrinciples":"\/blog\/our-team\/","url":"https:\/\/www.carparts.com\/blog\/author\/williamguzenski\/","sameAs":""}],"headline":"P0688 Code: ECM \/ PCM Power Relay Sense Circuit Open","datePublished":"2022-08-10T06:05:19+00:00","dateModified":"2023-09-01T05:43:44+00:00","mainEntityOfPage":{"@id":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/"},"wordCount":585,"commentCount":0,"publisher":{"@id":"https:\/\/www.carparts.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/#primaryimage"},"thumbnailUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-obd-scan-tool.jpg","articleSection":["OBD-II Trouble Codes"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/","url":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/","name":"P0688 Code: ECM \/ PCM Power Relay Sense Circuit Open - In The Garage with CarParts.com","isPartOf":{"@id":"https:\/\/www.carparts.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/#primaryimage"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/#primaryimage"},"thumbnailUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-obd-scan-tool.jpg","datePublished":"2022-08-10T06:05:19+00:00","dateModified":"2023-09-01T05:43:44+00:00","description":"Wondering what's the meaning of the P0688 code, its common causes and symptoms? Read this article to find out.","inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/#primaryimage","url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-obd-scan-tool.jpg","contentUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-obd-scan-tool.jpg","width":1500,"height":1000,"caption":"car obd scan tool"},{"@type":"WebSite","@id":"https:\/\/www.carparts.com\/blog\/#website","url":"https:\/\/www.carparts.com\/blog\/","name":"In The Garage with CarParts.com","description":"","publisher":{"@id":"https:\/\/www.carparts.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.carparts.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.carparts.com\/blog\/#organization","name":"CarParts.com","url":"https:\/\/www.carparts.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.carparts.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2025\/03\/cp-itg-logo.png","contentUrl":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2025\/03\/cp-itg-logo.png","width":2048,"height":398,"caption":"CarParts.com"},"image":{"@id":"https:\/\/www.carparts.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/carpartscom","https:\/\/x.com\/carpartscom","https:\/\/www.instagram.com\/carpartscom","https:\/\/www.youtube.com\/@CarPartscomOfficial\/"]},{"@type":"Person","@id":"","url":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/"}]}},"featured_image_src":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-obd-scan-tool.jpg","featured_image_src_square":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/car-obd-scan-tool.jpg","author_info":{"display_name":"","author_link":"https:\/\/www.carparts.com\/blog\/p0688-code-ecm-pcm-power-relay-sense-circuit-open\/"},"authors":[{"term_id":2607,"user_id":1651,"is_guest":0,"slug":"thecpteam","display_name":"CarParts.com Research Team","avatar_url":{"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg","url2x":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/04\/thecpteam.jpg"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""},{"term_id":2855,"user_id":1645,"is_guest":0,"slug":"williamguzenski","display_name":"William Guzenski, ASE Certified Master Automobile Technician","avatar_url":{"url":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/william-bill-guzenski-carparts-ase-certified-technician.png","url2x":"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/11\/william-bill-guzenski-carparts-ase-certified-technician.png"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/71322","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/comments?post=71322"}],"version-history":[{"count":0,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/71322\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media\/71340"}],"wp:attachment":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media?parent=71322"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/categories?post=71322"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/tags?post=71322"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=71322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}