{"id":78017,"date":"2025-08-25T13:18:45","date_gmt":"2025-08-25T18:18:45","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78017"},"modified":"2025-08-25T13:18:45","modified_gmt":"2025-08-25T18:18:45","slug":"p066f-obd2-cylinder-3-glow-plug-control-circuit-high","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p066f-obd2-cylinder-3-glow-plug-control-circuit-high","title":{"rendered":"P066F OBD2: Cylinder 3 Glow Plug Control Circuit High"},"content":{"rendered":"<p>The P066F code is a diagnostic trouble code (DTC) that relates to the glow plug control circuit for cylinder three in diesel engines. This code indicates that the engine control module (PCM) has detected a fault in the glow plug circuit.<\/p>\n<h2>What Does the P066F Code Mean?<\/h2>\n<p>The P066F code signifies that the glow plug for cylinder three is not functioning as expected. This could be due to high voltage in the control circuit, which can prevent the glow plug from operating properly.<\/p>\n<h2>What Causes the P066F Code?<\/h2>\n<p>Several factors can trigger the P066F code, including:<\/p>\n<ul>\n<li>Glow plug control module failure<\/li>\n<li>Glow plug failure<\/li>\n<li>Glow plug relay failure<\/li>\n<li>Glow plug wiring harness failure<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P066F Code?<\/h2>\n<p>Common symptoms associated with the P066F code include:<\/p>\n<ul>\n<li>Engine may not start<\/li>\n<li>Hard or no start in cold weather<\/li>\n<\/ul>\n<h2>How Serious Is the P066F Code?<\/h2>\n<p>The P066F code is considered urgent, indicating immediate action is necessary. Ignoring this code can lead to severe damage to the engine or pose safety risks to the driver and passengers.<\/p>\n<h2>How to Diagnose the P066F Code<\/h2>\n<p>Diagnosing the P066F code typically involves:<\/p>\n<ol>\n<li>Using an OBD-II scanner to confirm the presence of the P066F code.<\/li>\n<li>Inspecting the glow plug and its associated components, including the control module and wiring.<\/li>\n<li>Testing the glow plug operation and wiring for continuity and shorts.<\/li>\n<\/ol>\n<h2>Common Repairs for the P066F Code<\/h2>\n<p>Repairs that may be required to address the P066F code include:<\/p>\n<ul>\n<li>Glow plug replacement<\/li>\n<li>Repair or replacement of the glow plug control module<\/li>\n<li>Repair or replacement of the glow plug relay<\/li>\n<li>Repair or replacement of the wiring harness<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P066F Code?<\/h2>\n<p>The cost to fix the P066F code can vary widely based on the specific issue and labor rates in your area. Typically, glow plug replacement can range from $150 to $400, depending on the vehicle and the number of glow plugs that need attention.<\/p>\n<h2>Can I Fix the P066F Code Myself?<\/h2>\n<p>While it is possible to fix the P066F code yourself, it is essential to have a good understanding of automotive electrical systems and diagnostics. If you are not comfortable with these repairs, it is advisable to seek professional assistance to avoid causing further damage.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P066F code is a diagnostic trouble code (DTC) that relates to the glow plug control circuit for cylinder three in diesel engines. This code indicates that the engine control module (PCM) has detected a fault in the glow plug circuit. What Does the P066F Code Mean? The P066F code signifies that the glow plug &hellip;<\/p>\n","protected":false},"author":26,"featured_media":93770,"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-78017","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 P066F \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P066F code, what causes cylinder 3 glow plug 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\/p066f-obd2-cylinder-3-glow-plug-control-circuit-high\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P066F OBD2: Cylinder 3 Glow Plug Control Circuit High\" \/>\n<meta property=\"og:description\" content=\"The P066F code is a diagnostic trouble code (DTC) that relates to the glow plug control circuit for cylinder three in diesel engines. This code indicates\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p066f-obd2-cylinder-3-glow-plug-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=\"2025-08-25T18:18:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p066f-obd2-cylinder-3-glow-plug-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 name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" 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This code indicates that the engine control module (PCM) has detected a fault in the glow plug circuit. What Does the P066F Code Mean? The P066F code signifies that the glow plug&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78017","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=78017"}],"version-history":[{"count":1,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78017\/revisions"}],"predecessor-version":[{"id":84716,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78017\/revisions\/84716"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/93770"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=78017"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=78017"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=78017"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}