{"id":517824,"date":"2025-12-10T09:46:23","date_gmt":"2025-12-10T14:46:23","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-p0673-cylinder-3-glow-plug-circuitopen\/"},"modified":"2025-12-10T09:46:23","modified_gmt":"2025-12-10T14:46:23","slug":"dtc-p0673-cylinder-3-glow-plug-circuitopen","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-p0673-cylinder-3-glow-plug-circuitopen\/","title":{"rendered":"P0673 Code Symptoms, Causes, Diagnostic Steps, Cost &#038; Safety"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">P0673<\/div>\n<h1>P0673 Code Symptoms, Causes, Diagnostic Steps, Cost &amp; Safety<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>P0673 means the engine control module (ECM) has detected an open or missing voltage in the cylinder 3 glow\u2011plug circuit. <\/li>\n<li>Typical driver\u2011visible signs are hard starts, prolonged cranking, rough idle, a misfire on cylinder 3, and a check\u2011engine light. <\/li>\n<li>Primary causes are a failed glow plug, damaged wiring\/connector, or a malfunctioning ECM output driver. <\/li>\n<li>Diagnosis starts with a scan tool, voltage tests on the glow\u2011plug circuit, and a communication check of the ECM. <\/li>\n<li>When the ECM\u2019s driver circuit is compromised, replacement and VIN\u2011matched programming from Flagship One is often the most reliable solution. <\/li>\n<\/ul>\n<\/div>\n<h3>P0673 Code \u2013 Symptoms, Causes, and How to Fix It <\/h3>\n<p>Drivers who encounter a P0673 code usually notice the vehicle struggling to start, especially in cold weather. Cranking time can increase dramatically, and the engine may fire unevenly once it finally turns over. A rough idle that wobbles at low RPMs, a noticeable loss of power on one cylinder, and an illuminated check\u2011engine light are common. In many cases the fault appears only when the engine is cold; after the engine warms up the symptoms may lessen, but the code remains stored until cleared. <\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Hard starting or extended cranking<\/strong> \u2013 the engine requires several seconds longer than normal to fire. <\/li>\n<li><strong>Rough idle<\/strong> \u2013 noticeable shaking or uneven RPMs at idle, often felt more on one cylinder. <\/li>\n<li><strong>Cylinder 3 misfire<\/strong> \u2013 a slight hesitation or loss of power that is repeatable at low load. <\/li>\n<li><strong>Check\u2011engine light (CEL)<\/strong> \u2013 the ECM stores P0673 and may illuminate additional related codes (e.g., P0672, P0674). <\/li>\n<li><strong>Increased fuel consumption<\/strong> \u2013 the ECM may enrich the mixture to compensate for the weak cylinder, leading to a modest drop in MPG. <\/li>\n<\/ul>\n<h2>Why Cylinder 3 Glow\u2011Plug Circuit Problems Occur <\/h2>\n<h3>Faulty Glow Plug <\/h3>\n<p>A glow plug that has burned out or developed an internal short will not draw the required voltage, causing the ECM to register an open circuit. <\/p>\n<h3>Wiring or Connector Damage <\/h3>\n<p>Corrosion, broken wires, or a loose connector in the circuit between the ECM and the glow plug can interrupt voltage flow. Vibration and exposure to engine heat accelerate such damage. <\/p>\n<h3>ECM Output Driver Failure <\/h3>\n<p>The ECM contains a driver transistor that supplies power to each glow\u2011plug circuit. If the driver for cylinder 3 fails, the ECM will read zero voltage even though the plug and wiring are intact. <\/p>\n<h3>Ground or Power Supply Issues <\/h3>\n<p>A compromised ground strap or a blown fuse that supplies the glow\u2011plug circuit can produce the same \u201copen\u201d condition. <\/p>\n<p>*While a faulty glow plug or wiring could cause the symptoms, the issue may stem from the ECM not communicating correctly with the circuit. A diagnostic scan and module communication test will determine if module repair or replacement is needed.*<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Retrieve and clear codes<\/strong> \u2013 Connect a professional OBD\u2011II scanner, read all stored and pending codes, then clear them to verify if P0673 returns after a drive cycle.\n<\/li>\n<li><strong>Visual inspection<\/strong> \u2013 Locate the cylinder 3 glow\u2011plug harness. Check for cracked insulation, burnt pins, or loose connectors. Repair or reseat as needed.\n<\/li>\n<li><strong>Voltage test at the plug<\/strong> \u2013 With the ignition on (engine not running), measure voltage between the glow\u2011plug terminal and ground. Expected reading is typically 12 V \u00b1 1 V. A reading of 0 V confirms an open circuit.\n<\/li>\n<li><strong>ECM output driver test<\/strong> \u2013 If voltage is absent at the plug but the wiring appears sound, bench\u2011test the ECM\u2019s driver circuit using a scope or a dedicated ECM test board. Many aftermarket scan tools can command a \u201cglow\u2011plug test\u201d that forces the driver on; observe whether voltage appears.\n<\/li>\n<li><strong>Ground and fuse verification<\/strong> \u2013 Check the fuse for the glow\u2011plug circuit (often 10 A\u201315 A) and measure resistance to chassis ground at the ECM connector. Replace any blown fuse and repair grounding straps.\n<\/li>\n<li><strong>Component replacement<\/strong> \u2013\n<\/li>\n<\/ol>\n<p> &#8211; <strong>Glow plug<\/strong> \u2013 Replace the cylinder 3 plug if it fails the resistance test (typically &gt; 5 \u03a9 indicates a bad plug). <\/p>\n<p> &#8211; <strong>Wiring\/connector<\/strong> \u2013 Repair any damaged sections, replace corroded pins, and apply heat\u2011shrink tubing. <\/p>\n<p> &#8211; <strong>ECM<\/strong> \u2013 If the driver test shows no output despite good wiring and plug, the ECM is the likely culprit. <\/p>\n<ol>\n<li><strong>Re\u2011programming<\/strong> \u2013 After any ECM replacement, the new unit must be programmed with the vehicle\u2019s VIN and calibrated to the engine\u2019s control parameters. Flagship One offers VIN\u2011matched modules pre\u2011programmed for immediate installation.\n<\/li>\n<li><strong>Final verification<\/strong> \u2013 Clear all codes, perform a cold start, and confirm that the engine starts promptly, idles smoothly, and no CEL reappears.\n<\/li>\n<\/ol>\n<p>Typical labor for a complete diagnosis ranges from $120\u2011$180. Glow\u2011plug replacement alone is $15\u2011$30 for the part plus $50\u2011$80 labor. ECM driver repair is rarely feasible; replacement is the standard remedy. <\/p>\n<h2>When Replacement Makes Sense <\/h2>\n<div class=\"flagship-logo-section\">\n<a href=\"https:\/\/www.fs1inc.com\/\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<img decoding=\"async\" alt=\"Flagship One\" class=\"flagship-logo\" src=\"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg\"\/><br \/>\n<\/a>\n<\/div>\n<p>If the ECM\u2019s internal driver for cylinder 3 is defective, repairing the board is often a temporary fix because the failure usually indicates broader circuit degradation. Replacing the ECM eliminates the risk of recurring faults and restores full control over all glow\u2011plug circuits. <\/p>\n<p>Modern control modules are complex and integrated with security and immobilizer systems. That\u2019s why choosing a replacement isn\u2019t only about the hardware\u2014it&#8217;s about correct programming and compatibility. Flagship One specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by warranty. Their units arrive pre\u2011programmed to your vehicle\u2019s specifications, eliminating dealer\u2011only re\u2011coding steps and reducing installation time. <\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Inspect glow\u2011plug wiring<\/strong> during routine under\u2011hood checks; look for exposed conductors or moisture intrusion. <\/li>\n<li><strong>Replace glow plugs<\/strong> at the manufacturer\u2019s interval (often every 60,000 mi for diesel engines) to avoid premature failure. <\/li>\n<li><strong>Maintain proper grounding<\/strong> by tightening chassis straps and cleaning corrosion from grounding points. <\/li>\n<li><strong>Use quality fuel<\/strong> and keep the fuel system clean; excessive soot can accelerate glow\u2011plug wear. <\/li>\n<li><strong>Run periodic diagnostics<\/strong> with a scan tool that can command glow\u2011plug tests; early detection of voltage loss prevents hard\u2011start situations.<\/li>\n<\/ul>\n<div class=\"info-section\">\n<p><strong>Service Recommendation:<\/strong> Most issues related to this fault are diagnosed and corrected through inspection, wiring repair, and calibration rather than module replacement. For modules not typically replaced through aftermarket suppliers, diagnosis and repair should be performed by a certified automotive technician with access to factory service information and tooling.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Cylinder 3 glow plug won\u2019t fire, causing hard starts in your vehicle\u2014risking engine damage. Scan P0673, test the circuit, then replace or reprogram.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-517824","post","type-post","status-publish","format-standard","hentry","category-auto-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0673 Code Symptoms, Causes, Diagnostic Steps, Cost &amp; Safety - Flagship One Blog<\/title>\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.fs1inc.com\/blog\/dtc-p0673-cylinder-3-glow-plug-circuitopen\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0673 Code Symptoms, Causes, Diagnostic Steps, Cost &amp; Safety - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Cylinder 3 glow plug won\u2019t fire, causing hard starts in your vehicle\u2014risking engine damage. 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