{"id":517831,"date":"2025-12-10T09:51:33","date_gmt":"2025-12-10T14:51:33","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-p0680-cylinder-10-glow-plug-circuitopen\/"},"modified":"2025-12-10T09:51:33","modified_gmt":"2025-12-10T14:51:33","slug":"dtc-p0680-cylinder-10-glow-plug-circuitopen","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-p0680-cylinder-10-glow-plug-circuitopen\/","title":{"rendered":"P0680 Code Symptoms, Causes, Diagnosis &#038; Repair Step-by-Step Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">P0680<\/div>\n<h1>P0680 Code Symptoms, Causes, Diagnosis &amp; Repair Step-by-Step Guide<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>P0680 means the power\u2011train control module has detected an open circuit in the glow\u2011plug circuit for cylinder 10. <\/li>\n<li>Drivers typically notice hard starting, prolonged cranking, a rough idle after start\u2011up, and a loss of low\u2011end power until the fault clears. <\/li>\n<li>Most failures stem from damaged wiring, a failed PCM output driver, or a defective glow plug for cylinder 10. <\/li>\n<li>Diagnosis begins with a live scan, continuity checks on the glow\u2011plug harness, and verification of PCM communication. <\/li>\n<li>When repair is not practical, a PCM\/ECU replacement and proper re\u2011programming resolves the issue; Flagship One supplies VIN\u2011matched modules with warranty coverage. <\/li>\n<\/ul>\n<\/div>\n<h3>P0680 Code \u2013 Symptoms, Causes, and How to Fix It <\/h3>\n<p>Drivers first become aware of a P0680 fault when the engine refuses to start or cranks far longer than normal. The check\u2011engine light flashes, and once the engine finally fires, it may idle unevenly for a few seconds before smoothing out. In some cases the vehicle will lose a noticeable amount of torque on acceleration, especially when the engine is cold. These signs appear because the diesel\u2011engine control strategy relies on a timed glow\u2011plug pulse for cylinder 10; an open circuit prevents the plug from heating, delaying combustion and forcing the PCM to compensate with richer fuel and higher idle speed.<\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Hard start or extended cranking<\/strong> \u2013 the starter must turn the engine longer before ignition occurs. <\/li>\n<li><strong>Rough idle on initial start\u2011up<\/strong> \u2013 the engine may shake or stall for a few seconds, then settle. <\/li>\n<li><strong>Reduced low\u2011end power<\/strong> \u2013 acceleration feels sluggish until the PCM adjusts timing. <\/li>\n<li><strong>Check\u2011engine illumination<\/strong> \u2013 a flashing or steady MIL appears, often accompanied by a stored P0680 code. <\/li>\n<li><strong>Intermittent loss of power<\/strong> \u2013 the fault may clear after a warm\u2011up, then return when the engine cools down. <\/li>\n<\/ul>\n<h2>Why Cylinder 10 Glow\u2011Plug Circuit Problems Occur <\/h2>\n<h3>Open or Corroded Wiring Harness <\/h3>\n<p>The glow\u2011plug circuit runs from the PCM to the plug through a high\u2011temperature wire bundle. Heat\u2011induced insulation breakdown, corrosion at connector pins, or a broken splice creates an open circuit that the PCM flags as P0680.<\/p>\n<h3>Faulty Cylinder 10 Glow Plug <\/h3>\n<p>A cracked ceramic element or burned electrode inside the plug eliminates the heating current. The PCM still commands voltage, but no resistance is measured, producing the \u201ccircuit\/open\u201d condition.<\/p>\n<h3>PCM Output Driver Failure <\/h3>\n<p>Inside the PCM, a transistor or driver circuit supplies the high\u2011current pulse to the glow plug. If this component burns out, the PCM cannot deliver voltage, and the diagnostic routine records an open circuit.<\/p>\n<h3>Software or Calibration Issue <\/h3>\n<p>Incorrect mapping of glow\u2011plug timing or a corrupted calibration table can cause the PCM to misinterpret a healthy circuit as open. Re\u2011programming the module often resolves this subtle fault.<\/p>\n<h3>Secondary Possibilities (Redirected) <\/h3>\n<p>While a blown fuse or a malfunctioning relay could interrupt power, the primary fault usually resides in the PCM\u2011controlled circuit. A diagnostic scan will confirm whether the issue is truly a wiring\/open\u2011circuit condition or a broader control\u2011module communication problem.<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Retrieve and Confirm the Code<\/strong>\n<\/li>\n<\/ol>\n<p> Connect a professional OBD\u2011II scanner, read the stored codes, and verify that P0680 is present without conflicting codes that point to other systems.<\/p>\n<ol>\n<li><strong>Inspect Visual Wiring Condition<\/strong>\n<\/li>\n<\/ol>\n<p> Locate the glow\u2011plug harness near the engine block. Look for cracked insulation, melted sections, or water intrusion. Clean corroded pins with a contact\u2011cleaner brush.<\/p>\n<ol>\n<li><strong>Perform Continuity Test<\/strong>\n<\/li>\n<\/ol>\n<p> With the ignition off, disconnect the cylinder 10 glow\u2011plug connector. Use a multimeter to check continuity from the PCM pin to the plug terminal. An open reading confirms a wiring break.<\/p>\n<ol>\n<li><strong>Measure Voltage at the Plug<\/strong>\n<\/li>\n<\/ol>\n<p> Re\u2011connect the plug, crank the engine, and measure voltage at the plug terminal. The PCM should supply 8\u201312 V for a brief pulse. Zero or erratic voltage indicates a PCM driver fault.<\/p>\n<ol>\n<li><strong>Swap the Glow Plug (If Wiring Is Good)<\/strong>\n<\/li>\n<\/ol>\n<p> Replace the cylinder 10 plug with a known good unit. Re\u2011test voltage and observe if the fault clears. If the code persists, the PCM is the likely source.<\/p>\n<ol>\n<li><strong>PCM Communication Test<\/strong>\n<\/li>\n<\/ol>\n<p> Using the scan tool, command a live data stream for the glow\u2011plug control module. A lack of response or abnormal data points to a communication failure within the PCM.<\/p>\n<ol>\n<li><strong>Re\u2011program or Update PCM Software<\/strong>\n<\/li>\n<\/ol>\n<p> If the hardware checks out, apply the latest PCM calibration file from the manufacturer. Re\u2011flash the module and clear the code. Verify that the fault does not return after a drive cycle.<\/p>\n<ol>\n<li><strong>Replace the PCM\/ECU When Repair Is Not Viable<\/strong>\n<\/li>\n<\/ol>\n<p> When the output driver is damaged or internal board corrosion is evident, replacement is the most reliable solution. A new PCM must be programmed to the vehicle\u2019s VIN and calibrated for the engine\u2019s glow\u2011plug strategy.<\/p>\n<p><strong>Cost Estimates<\/strong> <\/p>\n<ul>\n<li>Wiring repair or connector cleaning: $50\u2011$120 labor. <\/li>\n<li>Glow\u2011plug replacement (diesel plug only): $30\u2011$80 part, $40\u2011$70 labor. <\/li>\n<li>PCM re\u2011programming: $120\u2011$180 labor, plus possible software access fees. <\/li>\n<li>PCM replacement (including programming): $600\u2011$900 for the module, $200\u2011$300 labor.<\/li>\n<\/ul>\n<h2>When Replacement Makes More Sense Than Repair <\/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 continuity testing reveals a broken internal driver, or if repeated repairs fail to clear the P0680 code, installing a new PCM is the most dependable path forward. Modern control modules are tightly integrated with security, immobilizer, and emission\u2011control networks; a faulty board can cause intermittent failures that are costly to troubleshoot repeatedly. <\/p>\n<p><strong>Flagship One<\/strong> specializes in VIN\u2011matched control modules, delivering a plug\u2011and\u2011drive solution that includes factory\u2011level programming and a comprehensive warranty. Replacement PCM units vary depending on production date and software version, so the correct module is matched by VIN before programming. This approach eliminates dealer\u2011only re\u2011coding delays and ensures that your vehicle\u2019s control strategy is restored to OEM specifications.<\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Regularly Inspect Glow\u2011Plug Wiring<\/strong> \u2013 During routine service, check the harness for signs of wear, especially after high\u2011temperature operation or exposure to road salt. <\/li>\n<li><strong>Replace Glow Plugs at Manufacturer Intervals<\/strong> \u2013 Diesel engines often require glow\u2011plug replacement every 80,000\u2013100,000 mi to avoid premature failure. <\/li>\n<li><strong>Maintain Clean Connectors<\/strong> \u2013 Use dielectric grease on plug terminals to prevent moisture ingress, which can cause corrosion and open circuits. <\/li>\n<li><strong>Stay Current with PCM Software Updates<\/strong> \u2013 Manufacturers release calibration patches that address known glow\u2011plug timing issues; applying these updates reduces the likelihood of false\u2011open detections. <\/li>\n<li><strong>Monitor for Unusual Cranking Times<\/strong> \u2013 Early detection of extended start periods can prompt a quick scan before the fault escalates to a full PCM failure.<\/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>Your vehicle won\u2019t start or stalls because cylinder 10 glow\u2011plug circuit is open (P0680); diagnose the wiring or replace the glow plug now today.<\/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-517831","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>P0680 Code Symptoms, Causes, Diagnosis &amp; Repair Step-by-Step Guide - 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-p0680-cylinder-10-glow-plug-circuitopen\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0680 Code Symptoms, Causes, Diagnosis &amp; 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