{"id":71323,"date":"2022-08-09T23:02:25","date_gmt":"2022-08-10T06:02:25","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=71323"},"modified":"2023-10-02T19:22:00","modified_gmt":"2023-10-03T02:22:00","slug":"p0678-code-cylinder-8-glow-plug-circuit-open","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0678-code-cylinder-8-glow-plug-circuit-open\/","title":{"rendered":"P0678 Code: Cylinder #8 Glow Plug 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_4b4c18-c8 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_4b4c18-c8 > .kt-inside-inner-col,.kadence-column_4b4c18-c8 > .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_4b4c18-c8 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_4b4c18-c8 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_4b4c18-c8 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_4b4c18-c8 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_4b4c18-c8{position:relative;}@media all and (max-width: 1024px){.kadence-column_4b4c18-c8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_4b4c18-c8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_4b4c18-c8 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-6cc27b  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-a467e8\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_2fb841-2d, .wp-block-kadence-advancedheading.kt-adv-heading_2fb841-2d[data-kb-block=\"kb-adv-heading_2fb841-2d\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_2fb841-2d mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_2fb841-2d[data-kb-block=\"kb-adv-heading_2fb841-2d\"] 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_2fb841-2d img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_2fb841-2d[data-kb-block=\"kb-adv-heading_2fb841-2d\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_2fb841-2d summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_2fb841-2d\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Diagnostic trouble code (DTC) P0678 code stands for &ldquo;Cylinder #8 Glow Plug Circuit\/Open.&rdquo; The powertrain control module (PCM) triggers the P0678 code when it detects the glow plug in cylinder 8 isn&rsquo;t operating properly.<\/li><li>The P0678 code can be triggered by a faulty glow plug in cylinder #8, faulty wires or damaged connections, and a faulty PCM.<\/li><li>The P0678 code&rsquo;s symptoms include an illuminated check engine light, difficulty starting the engine, lack of power while the engine is cold, and a preheat light that won&rsquo;t turn off.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Are you having trouble starting your diesel engine? You may want to connect a scan tool to see if there are any trouble codes logged. If the P0678 code has been triggered, read this article for everything you need to know about its definition, common causes, and common symptoms.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0678 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0678 code stands for Cylinder #8 Glow Plug Circuit\/Open. The powertrain control module (PCM) triggers the P0678 code when it detects the glow plug in cylinder 8 isn&rsquo;t operating properly. Diesel engines need the <a href=\"https:\/\/www.carparts.com\/glow-plug\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"glow plug\">glow plug<\/a> to heat the combustion chamber before the engine is started. Unlike gasoline, which can readily ignite in most conditions just by introducing a spark, diesel fuel can only ignite when it reaches its flash point temperature. A <a href=\"https:\/\/www.carparts.com\/blog\/the-top-4-symptoms-of-bad-glow-plugs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"faulty glow plug\">faulty glow plug<\/a> can prevent diesel from igniting in cold weather conditions.<\/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\/installing-a-glow-plug-1024x683.jpg\" alt=\"installing a glow plug\" class=\"wp-image-71342\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/installing-a-glow-plug-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/installing-a-glow-plug-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/installing-a-glow-plug-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/installing-a-glow-plug-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/installing-a-glow-plug-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/installing-a-glow-plug.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The PCM triggers the P0678 code when it detects the glow plug in cylinder 8 isn&rsquo;t operating properly.<\/figcaption><\/figure>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of the P0678 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 P0678 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Faulty glow plug in cylinder #8<\/li><li>Circuit issues, 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><li>Faulty control module<\/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 P0678 Code?<\/h2>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light will likely illuminate\">check engine light will likely illuminate<\/a> as soon as the PCM detects a faulty glow plug. There might not be any immediate symptoms since the engine can still start if there&rsquo;s only one faulty glow plug. However, you&rsquo;re more likely to experience the following symptoms if the weather is cold:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Difficulty starting the engine\">Difficulty starting the engine<\/a><\/li><li>Lack of power while the engine is cold<\/li><li>The preheat light might not turn off<\/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\/driver-starting-a-car-1024x683.jpg\" alt=\"driver starting a car\" class=\"wp-image-71343\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/driver-starting-a-car-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/driver-starting-a-car-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/driver-starting-a-car-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/driver-starting-a-car-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/driver-starting-a-car-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/driver-starting-a-car.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Difficulty starting the engine is a common symptom of code P0678.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0678 Code<\/h2>\n\n\n\n<p>The P0678 code&rsquo;s definition does point to a faulty glow plug in cylinder number eight. However, there&rsquo;s a chance that this isn&rsquo;t always the issue. When it comes to fixing DTCs, you must first accurately diagnose the problem before you do any fixes. The concerned components will likely need to be inspected or tested to find the root cause. This task might require specialist equipment or knowledge, so it&rsquo;s best to leave it to a professional mechanic.<\/p>\n\n\n\n<p>Want to learn how you can diagnose the problem yourself? Check out the video below:<\/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=\"Diagnose Glow Plug 6.6 Duramax-Angry Mechanic P0671,P0672,P0673,P0674,P0675 P0676,P0677,P0678\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/XZFAxRjxgHI?start=92&amp;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 P0678 Code<\/h2>\n\n\n\n<p>There isn&rsquo;t a single procedure that can fix the problems that trigger your vehicle&rsquo;s stored <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD-II code\">OBD-II code<\/a>. Depending on the defective component and vehicle design, the repair procedure can vary. The best solution is to do a thorough inspection before executing a repair. You can consult various <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=\"internet vehicle repair resources and how-to guides\">internet vehicle repair resources and how-to guides<\/a> for possible solutions when you&rsquo;ve correctly identified the problem. You should also remember that your <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vehicle&rsquo;s owner&rsquo;s manual\">vehicle&rsquo;s owner&rsquo;s manual<\/a> can contain valuable troubleshooting tips.<\/p>\n\n\n\n<p>Chilton repair manuals can also be useful. ALLDATA subscriptions , on the other hand, may be better because they include specific factory repair information for drivers who wish to perform their own repairs.<\/p>\n\n\n\n<p>If you don&rsquo;t have much experience diagnosing or repairing error codes, it&rsquo;s best 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>Are you having trouble starting your diesel engine? You may want to connect a scan tool to see if there&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0678-code-cylinder-8-glow-plug-circuit-open\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":71339,"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":[2714],"ppma_author":[2607,2855],"class_list":{"0":"post-71323","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-glow-plug","9":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0678 Code: Cylinder #8 Glow Plug Circuit \/ Open - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn more about the definition, common causes, and symptoms of the P0678 code in this article. Read on for more info.\" \/>\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\/p0678-code-cylinder-8-glow-plug-circuit-open\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0678 Code: Cylinder #8 Glow Plug Circuit \/ Open - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn more about the definition, common causes, and symptoms of the P0678 code in this article. 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