{"id":519686,"date":"2025-12-11T14:55:43","date_gmt":"2025-12-11T19:55:43","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/"},"modified":"2025-12-11T14:55:43","modified_gmt":"2025-12-11T19:55:43","slug":"dtc-u3514-high-voltage-system-interlock-circuit-b-high","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/","title":{"rendered":"U3514 Code Symptoms, Diagnosis, Repair Costs &#038; Safety Tips Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">U3514<\/div>\n<h1>U3514 Code Symptoms, Diagnosis, Repair Costs &amp; Safety Tips Guide<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>U3514 means **High\u2011Voltage System Interlock Circuit B High** \u2013 a safety fault in the hybrid\/electric high\u2011voltage network. <\/li>\n<li>Drivers usually see a dash warning (HV system, hybrid fault, or \u201cairbag\u201d light), loss of hybrid drive, or a no\u2011start condition. <\/li>\n<li>The fault originates in the high\u2011voltage control module or its wiring; it is not caused by engine\u2011related components. <\/li>\n<li>Proper diagnosis requires a bi\u2011directional scan, wiring continuity checks, and verification of module communication. <\/li>\n<li>Replacement of the affected control module, correctly programmed to the vehicle\u2019s VIN, is often the most reliable fix; Flagship One supplies VIN\u2011matched, pre\u2011programmed modules. <\/li>\n<\/ul>\n<\/div>\n<h3>U3514 Code Symptoms, Diagnosis, and Repair Options <\/h3>\n<p>Drivers first notice a warning light that reads <strong>\u201cHV System,\u201d \u201cHybrid Fault,\u201d<\/strong> or a generic <strong>airbag\/air\u2011bag warning<\/strong> on the instrument cluster. In many cases the high\u2011voltage system is disabled, so the vehicle will either refuse to start, run only on the 12 V auxiliary system, or operate in a reduced\u2011power \u201climp\u2011home\u201d mode. Some owners report that the hybrid propulsion disengages while the gasoline engine (if present) continues to run, but the vehicle cannot accelerate beyond a low speed threshold. The fault can also trigger a <strong>\u201cCheck Hybrid System\u201d<\/strong> message that persists after the ignition is cycled. Because the interlock circuit protects the high\u2011voltage battery and the occupant\u2011protection system, the vehicle\u2019s computer will not permit normal hybrid operation until the fault is cleared.<\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>HV\/Hybrid warning lamp illuminated<\/strong> \u2013 often flashing or steady. <\/li>\n<li><strong>Hybrid drive disabled<\/strong> \u2013 vehicle reverts to 12 V\u2011only operation or refuses to start. <\/li>\n<li><strong>Reduced power or limp\u2011home mode<\/strong> \u2013 acceleration limited, speed capped around 15\u201120 mph. <\/li>\n<li><strong>No\u2011start condition<\/strong> \u2013 key turn results in no cranking or only accessory mode. <\/li>\n<li><strong>Airbag or safety\u2011system light<\/strong> \u2013 may appear because the high\u2011voltage interlock is tied to the occupant\u2011protection circuit. <\/li>\n<\/ul>\n<p>These indicators appear immediately after the fault is detected; the vehicle\u2019s control strategy will not allow high\u2011voltage activation until the interlock circuit reads normal.<\/p>\n<h2>Why This Happens <\/h2>\n<h3><strong>Faulty High\u2011Voltage Interlock Switch (Circuit B)<\/strong> <\/h3>\n<p>The interlock switch monitors voltage levels and continuity in the high\u2011voltage circuit. A shorted or open switch can present a \u201chigh\u201d condition to the control module, triggering U3514. Corrosion, moisture ingress, or mechanical wear are common culprits.<\/p>\n<h3><strong>Damaged Wiring Harness or Connectors<\/strong> <\/h3>\n<p>High\u2011voltage cables are insulated with special jackets. Cracks, chafing, or connector pin corrosion can cause a voltage spike that the module interprets as a high\u2011voltage interlock fault. A broken ground or a short to the vehicle chassis will produce the same symptom.<\/p>\n<h3><strong>Control Module Software Corruption<\/strong> <\/h3>\n<p>The hybrid control module (HCM), battery\u2011management module (BMS), or power\u2011train control module (PCM) stores calibration data for the interlock circuit. Corrupted flash memory or an incomplete flash update can misread a normal voltage as \u201chigh,\u201d setting U3514.<\/p>\n<h3><strong>Internal Module Hardware Failure<\/strong> <\/h3>\n<p>A failed voltage\u2011sense ASIC, burned\u2011out driver, or damaged PCB trace inside the high\u2011voltage control module can generate a false high\u2011voltage signal. Because the fault is internal, external wiring may appear flawless.<\/p>\n<h3><strong>Battery Pack Over\u2011Voltage Condition<\/strong> <\/h3>\n<p>A cell\u2011balancing fault or a failed cell can raise the pack voltage beyond safe limits, prompting the interlock circuit to report a high condition. While the battery itself is not a \u201cmodule\u201d sold by Flagship One, the resulting fault is still resolved through module diagnostics and possible replacement.<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Read the Full DTC Set<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a manufacturer\u2011approved bi\u2011directional scanner. Record all related codes (e.g., Bxxxx, Cxxxx) that may point to wiring or secondary modules. <\/p>\n<ol>\n<li><strong>Verify Battery Voltage<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Measure pack voltage with a high\u2011voltage probe. Ensure it is within the manufacturer\u2019s specification (typically 300\u2011400 V for most hybrids). An out\u2011of\u2011range reading suggests a battery\u2011level issue that must be addressed before module work. <\/p>\n<ol>\n<li><strong>Inspect Interlock Switch and Wiring<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Locate the High\u2011Voltage Interlock Switch B (often near the high\u2011voltage fuse block). Visually examine for corrosion, broken pins, or damaged insulation. Perform a continuity test between the switch terminals and the control module\u2019s reference ground. <\/p>\n<ol>\n<li><strong>Perform a Voltage\u2011Sense Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Using a scope or the scanner\u2019s live data function, monitor the interlock voltage signal while the vehicle is in \u201cON\u201d and \u201cREADY\u201d states. A constant high reading (&gt; 5 V for most systems) confirms the fault source. <\/p>\n<ol>\n<li><strong>Module Communication Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Run the scanner\u2019s \u201cmodule handshake\u201d or \u201ccommunication verification\u201d routine on the hybrid control module. Failure indicates a possible internal fault or corrupted firmware. <\/p>\n<ol>\n<li><strong>Software Re\u2011flash<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the module passes hardware tests, attempt a factory\u2011approved software update. Re\u2011flashing can clear corrupted calibration tables that cause false high\u2011voltage reports. <\/p>\n<ol>\n<li><strong>Component Replacement<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When the interlock switch, wiring, or module fails any test, replace the defective part. For a control\u2011module failure, obtain a VIN\u2011matched replacement, have it programmed with the vehicle\u2019s encryption keys, and reinstall. <\/p>\n<p><strong>Typical costs<\/strong> <\/p>\n<ul>\n<li>Diagnostic scan and labor: <strong>$150\u2011$250<\/strong>. <\/li>\n<li>Interlock switch replacement (including part and labor): <strong>$200\u2011$350<\/strong>. <\/li>\n<li>Control\u2011module re\u2011programming (factory flash): <strong>$250\u2011$400<\/strong>. <\/li>\n<li>Full module replacement (including VIN\u2011matched unit and programming): <strong>$1,200\u2011$1,800<\/strong> plus <strong>$200\u2011$300<\/strong> 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 the high\u2011voltage control module fails the internal hardware verification or repeatedly loses communication after a software re\u2011flash, replacement is the most reliable path. Modern control modules are densely packed with safety\u2011critical processors, encryption chips, and high\u2011voltage sense circuitry. A single damaged trace can cause intermittent U3514 events that are costly to troubleshoot repeatedly. <\/p>\n<p><strong>Flagship One<\/strong> specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution that includes pre\u2011programmed encryption keys and a comprehensive warranty. Because the replacement unit is matched to the vehicle\u2019s production date and software version, it eliminates the risk of mismatched firmware that can re\u2011trigger high\u2011voltage interlock faults. Professional technicians can install the module with a single connector harness, then verify operation with a calibrated scan tool.<\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Keep high\u2011voltage connectors dry<\/strong> \u2013 regularly inspect for moisture, especially after exposure to rain, snow, or car washes. Use dielectric grease on connector pins when re\u2011torqued. <\/li>\n<li><strong>Inspect wiring harnesses for wear<\/strong> \u2013 chafed or pinched cables should be replaced before they develop short circuits. <\/li>\n<li><strong>Schedule battery\u2011balance checks<\/strong> \u2013 a well\u2011balanced pack reduces the chance of over\u2011voltage spikes that stress the interlock circuit. <\/li>\n<li><strong>Apply software updates promptly<\/strong> \u2013 manufacturers release calibration fixes that improve interlock signal processing; staying current prevents false\u2011high readings. <\/li>\n<li><strong>Use OEM\u2011approved diagnostic tools<\/strong> \u2013 aftermarket scanners may misinterpret high\u2011voltage data, leading to unnecessary part replacement.<\/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>Airbag warning on your vehicle? High Voltage System Interlock Circuit B high, risking airbag function. Scan the module and have it re\u2011programmed or repl&#8230;<\/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-519686","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>U3514 Code Symptoms, Diagnosis, Repair Costs &amp; Safety Tips 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-u3514-high-voltage-system-interlock-circuit-b-high\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U3514 Code Symptoms, Diagnosis, Repair Costs &amp; Safety Tips Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Airbag warning on your vehicle? High Voltage System Interlock Circuit B high, risking airbag function. Scan the module and have it re\u2011programmed or repl...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/\" \/>\n<meta property=\"og:site_name\" content=\"Flagship One Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/flagshipone\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/flagshipone\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-11T19:55:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg\" \/>\n<meta name=\"author\" content=\"FlagshipOne\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@theflagshipone\" \/>\n<meta name=\"twitter:site\" content=\"@theflagshipone\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"FlagshipOne\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/\"},\"author\":{\"name\":\"FlagshipOne\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\"},\"headline\":\"U3514 Code Symptoms, Diagnosis, Repair Costs &#038; Safety Tips Guide\",\"datePublished\":\"2025-12-11T19:55:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/\"},\"wordCount\":1163,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"articleSection\":[\"Auto News\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/\",\"name\":\"U3514 Code Symptoms, Diagnosis, Repair Costs & Safety Tips Guide - Flagship One Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"datePublished\":\"2025-12-11T19:55:43+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"contentUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"width\":2560,\"height\":617},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"U3514 Code Symptoms, Diagnosis, Repair Costs &#038; Safety Tips Guide\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\",\"name\":\"Flagship One Blog\",\"description\":\"Flagship One Inc. OEM Engine Computers  Control Modules\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\",\"name\":\"Flagship One, Inc.\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/web-lg-fs1-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/web-lg-fs1-logo.png\",\"width\":1341,\"height\":1098,\"caption\":\"Flagship One, Inc.\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/flagshipone\",\"https:\\\/\\\/x.com\\\/theflagshipone\",\"https:\\\/\\\/www.instagram.com\\\/flagship_one\",\"https:\\\/\\\/www.youtube.com\\\/channel\\\/UC0oyKphffBM2qkJ-gKPmMXw\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\",\"name\":\"FlagshipOne\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"caption\":\"FlagshipOne\"},\"description\":\"The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.\",\"sameAs\":[\"https:\\\/\\\/www.fs1inc.com\\\/\",\"https:\\\/\\\/www.facebook.com\\\/flagshipone\\\/\",\"https:\\\/\\\/www.instagram.com\\\/flagship_one\\\/\",\"https:\\\/\\\/www.linkedin.com\\\/company\\\/fs1inc\"],\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/author\\\/flagship1inc\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"U3514 Code Symptoms, Diagnosis, Repair Costs & Safety Tips Guide - Flagship One Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/","og_locale":"en_US","og_type":"article","og_title":"U3514 Code Symptoms, Diagnosis, Repair Costs & Safety Tips Guide - Flagship One Blog","og_description":"Airbag warning on your vehicle? High Voltage System Interlock Circuit B high, risking airbag function. Scan the module and have it re\u2011programmed or repl...","og_url":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/","og_site_name":"Flagship One Blog","article_publisher":"https:\/\/www.facebook.com\/flagshipone","article_author":"https:\/\/www.facebook.com\/flagshipone\/","article_published_time":"2025-12-11T19:55:43+00:00","og_image":[{"url":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","type":"","width":"","height":""}],"author":"FlagshipOne","twitter_card":"summary_large_image","twitter_creator":"@theflagshipone","twitter_site":"@theflagshipone","twitter_misc":{"Written by":"FlagshipOne","Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/#article","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/"},"author":{"name":"FlagshipOne","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700"},"headline":"U3514 Code Symptoms, Diagnosis, Repair Costs &#038; Safety Tips Guide","datePublished":"2025-12-11T19:55:43+00:00","mainEntityOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/"},"wordCount":1163,"commentCount":0,"publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/#primaryimage"},"thumbnailUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","articleSection":["Auto News"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/","url":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/","name":"U3514 Code Symptoms, Diagnosis, Repair Costs & Safety Tips Guide - Flagship One Blog","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/#primaryimage"},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/#primaryimage"},"thumbnailUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","datePublished":"2025-12-11T19:55:43+00:00","breadcrumb":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/#primaryimage","url":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","contentUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","width":2560,"height":617},{"@type":"BreadcrumbList","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-u3514-high-voltage-system-interlock-circuit-b-high\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.fs1inc.com\/blog\/"},{"@type":"ListItem","position":2,"name":"U3514 Code Symptoms, Diagnosis, Repair Costs &#038; Safety Tips Guide"}]},{"@type":"WebSite","@id":"https:\/\/www.fs1inc.com\/blog\/#website","url":"https:\/\/www.fs1inc.com\/blog\/","name":"Flagship One Blog","description":"Flagship One Inc. OEM Engine Computers  Control Modules","publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.fs1inc.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.fs1inc.com\/blog\/#organization","name":"Flagship One, Inc.","url":"https:\/\/www.fs1inc.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2019\/06\/web-lg-fs1-logo.png","contentUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2019\/06\/web-lg-fs1-logo.png","width":1341,"height":1098,"caption":"Flagship One, Inc."},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/flagshipone","https:\/\/x.com\/theflagshipone","https:\/\/www.instagram.com\/flagship_one","https:\/\/www.youtube.com\/channel\/UC0oyKphffBM2qkJ-gKPmMXw"]},{"@type":"Person","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700","name":"FlagshipOne","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","caption":"FlagshipOne"},"description":"The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.","sameAs":["https:\/\/www.fs1inc.com\/","https:\/\/www.facebook.com\/flagshipone\/","https:\/\/www.instagram.com\/flagship_one\/","https:\/\/www.linkedin.com\/company\/fs1inc"],"url":"https:\/\/www.fs1inc.com\/blog\/author\/flagship1inc\/"}]}},"_links":{"self":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/519686","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/comments?post=519686"}],"version-history":[{"count":0,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/519686\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/media?parent=519686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/categories?post=519686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/tags?post=519686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}