{"id":78041,"date":"2025-08-24T13:42:38","date_gmt":"2025-08-24T18:42:38","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78041"},"modified":"2025-08-24T13:42:38","modified_gmt":"2025-08-24T18:42:38","slug":"p0687-obd2-ecm-pcm-power-relay-control-circuit-high","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0687-obd2-ecm-pcm-power-relay-control-circuit-high","title":{"rendered":"P0687 OBD2: ECM\/PCM Power Relay Control Circuit High"},"content":{"rendered":"<h2>What Does the P0687 Code Mean?<\/h2>\n<p>The P0687 code indicates that the engine control module (ECM) or powertrain control module (PCM) has detected a high voltage condition in the power relay control circuit.<\/p>\n<h2>What Causes the P0687 Code?<\/h2>\n<p>There are several factors that can trigger the P0687 code, including:<\/p>\n<ul>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Powertrain Control Module (PCM) power relay failure<\/li>\n<li>Wiring issues related to the power relay circuit<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0687 Code?<\/h2>\n<p>Common symptoms associated with the P0687 code are:<\/p>\n<ul>\n<li>Engine may not start, particularly in cold weather<\/li>\n<li>Hard starting conditions<\/li>\n<\/ul>\n<h2>How Serious Is the P0687 Code?<\/h2>\n<p>This code is categorized as urgent, meaning immediate action is necessary. Failure to address this code may lead to severe damage to the vehicle&#8217;s engine or compromise the safety of the driver and passengers.<\/p>\n<h2>How to Diagnose the P0687 Code<\/h2>\n<p>To diagnose the P0687 code, a mechanic should follow these steps:<\/p>\n<ol>\n<li>Use an OBD-II scanner to confirm the P0687 code.<\/li>\n<li>Inspect the power relay and wiring for any visible signs of damage.<\/li>\n<li>Test the power relay operation and the voltage signals from the PCM.<\/li>\n<li>Check the PCM for proper functionality and any other related codes.<\/li>\n<\/ol>\n<h2>Common Repairs for the P0687 Code<\/h2>\n<p>Repairs that may be required for the P0687 code include:<\/p>\n<ul>\n<li>Replacing a faulty PCM<\/li>\n<li>Replacing the PCM power relay<\/li>\n<li>Repairing or replacing damaged wiring in the power relay circuit<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0687 Code?<\/h2>\n<p>The cost to fix the P0687 code can vary widely based on the underlying issue. On average, repairs can range from $100 to $1,000 or more, depending on whether a relay, wiring, or PCM replacement is necessary.<\/p>\n<h2>Can I Fix the P0687 Code Myself?<\/h2>\n<p>While some vehicle owners with mechanical experience may attempt to diagnose and fix the P0687 code themselves, it is crucial to have a comprehensive understanding of automotive electronics. If you&#8217;re unsure, it\u2019s best to consult with a professional mechanic to avoid further damage.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Does the P0687 Code Mean? The P0687 code indicates that the engine control module (ECM) or powertrain control module (PCM) has detected a high voltage condition in the power relay control circuit. What Causes the P0687 Code? There are several factors that can trigger the P0687 code, including: Powertrain Control Module (PCM) failure Powertrain &hellip;<\/p>\n","protected":false},"author":26,"featured_media":93701,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[11987],"tags":[],"class_list":["post-78041","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-p-obd2-codes-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P0687 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0687 code, what causes ECM\/PCM power relay control circuit high, and how to diagnose and fix common issues to maintain optimal engine performance.\" \/>\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.emanualonline.com\/blog\/p0687-obd2-ecm-pcm-power-relay-control-circuit-high\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0687 OBD2: ECM\/PCM Power Relay Control Circuit High\" \/>\n<meta property=\"og:description\" content=\"What Does the P0687 Code Mean? The P0687 code indicates that the engine control module (ECM) or powertrain control module (PCM) has detected a high\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0687-obd2-ecm-pcm-power-relay-control-circuit-high\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/jee514\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-24T18:42:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0687-obd2-ecmpcm-power-relay-control-circuit-high.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"JC Landry\" \/>\n<meta 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The P0687 code indicates that the engine control module (ECM) or powertrain control module (PCM) has detected a high voltage condition in the power relay control circuit. What Causes the P0687 Code? There are several factors that can trigger the P0687 code, including: Powertrain Control Module (PCM) failure Powertrain&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78041","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/comments?post=78041"}],"version-history":[{"count":1,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78041\/revisions"}],"predecessor-version":[{"id":84740,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78041\/revisions\/84740"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/93701"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=78041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=78041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=78041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}