{"id":518931,"date":"2025-12-11T03:11:13","date_gmt":"2025-12-11T08:11:13","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/"},"modified":"2025-12-11T03:11:13","modified_gmt":"2025-12-11T08:11:13","slug":"dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/","title":{"rendered":"P3448 Code Symptoms, Causes, Diagnosis, Repair &#038; Reprogramming"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">P3448<\/div>\n<h1>P3448 Code Symptoms, Causes, Diagnosis, Repair &amp; Reprogramming<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>P3448 signals a high\u2011voltage condition on the cylinder 6 exhaust\u2011valve control circuit. <\/li>\n<li>Typical driver\u2011visible signs are a check\u2011engine light, loss of power or roughness on cylinder 6, and a drop in fuel efficiency. <\/li>\n<li>Primary causes are a faulty exhaust\u2011valve actuator, damaged wiring\/connector, or a malfunctioning power\u2011train control module (PCM). <\/li>\n<li>Diagnosis requires a live scan, voltage verification, and wiring continuity checks; re\u2011programming may clear the code. <\/li>\n<li>Replacement of the PCM is often the most reliable fix; Flagship One supplies VIN\u2011matched, pre\u2011programmed modules with warranty coverage. <\/li>\n<\/ul>\n<\/div>\n<p>When the power\u2011train control module detects an abnormally high voltage on the exhaust\u2011valve actuator for cylinder 6, the check\u2011engine light illuminates and the engine may run unevenly. Drivers usually notice the problem immediately because the loss of power is confined to a single cylinder, making the fault easy to identify during everyday driving. Early detection prevents further damage to the valve\u2011timing system and avoids costly downstream repairs. <\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Check\u2011engine light<\/strong> illuminated with P3448 stored in the PCM. <\/li>\n<li><strong>Loss of power or hesitation<\/strong> when accelerating, especially at low to mid\u2011range RPM where cylinder 6 contributes most to torque. <\/li>\n<li><strong>Rough idle or misfire\u2011like vibration<\/strong> that is strongest when the engine is at idle or under light load. <\/li>\n<li><strong>Slight reduction in fuel\u2011economy figures<\/strong> (typically 1\u20112 mpg) due to the cylinder operating inefficiently. <\/li>\n<li><strong>Engine\u2011speed fluctuations<\/strong> that disappear when the vehicle is turned off and the code clears temporarily. <\/li>\n<\/ul>\n<p>These signs point directly to the cylinder 6 exhaust\u2011valve circuit rather than to unrelated systems such as the fuel pump or ignition coils. <\/p>\n<h2>Why Cylinder 6 Exhaust Valve Control Circuit High Occurs <\/h2>\n<h3>Faulty Exhaust\u2011Valve Actuator <\/h3>\n<p>The actuator that opens and closes the exhaust valve for cylinder 6 is driven by a pulse\u2011width\u2011modulated signal from the PCM. Internal short\u2011circuits or a failed driver transistor can push the voltage well above the normal 5\u201112 V range, triggering the \u201ccircuit high\u201d condition. <\/p>\n<h3>Wiring or Connector Damage <\/h3>\n<p>Corroded pins, cracked insulation, or a loose connector can create a high\u2011resistance path that spikes voltage when the PCM attempts to drive the actuator. Heat\u2011induced expansion and contraction are common culprits, especially in engines with tight engine\u2011bay packaging. <\/p>\n<h3>Power\u2011Train Control Module (PCM) Fault <\/h3>\n<p>The PCM generates the control signal. A failing output driver, a damaged voltage regulator, or corrupted software can send an excessive voltage level to the actuator. In many cases the PCM\u2019s internal diagnostics detect the abnormal reading and set P3448. <\/p>\n<h3>Voltage Regulator or Ground\u2011Loop Issues <\/h3>\n<p>Improper grounding or a malfunctioning vehicle\u2011wide voltage regulator can raise the reference voltage for the entire control circuit. When the reference drifts upward, even a healthy actuator appears to be \u201chigh.\u201d <\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Retrieve and Verify the Code<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a professional OBD\u2011II scanner, read the stored and pending codes, and confirm P3448 is present without contradictory codes (e.g., P0306). <\/p>\n<ol>\n<li><strong>Live Data Inspection<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Access the \u201cCylinder 6 Exhaust Valve Position\u201d and \u201cVoltage\u201d parameters. Normal voltage should stay within 5\u201112 V during actuation. Any reading above 12 V confirms the high\u2011circuit condition. <\/p>\n<ol>\n<li><strong>Visual Wiring Check<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Locate the actuator harness near cylinder 6. Inspect for frayed wires, corrosion, or loose pins. Use a multimeter to verify continuity from the PCM pin to the actuator connector (resistance &lt; 0.5 \u03a9). <\/p>\n<ol>\n<li><strong>Actuator Voltage Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; With the engine running at 1500 rpm, measure the voltage at the actuator connector. Compare to the live data reading. If the measured voltage exceeds the PCM\u2019s reported value, the wiring is likely causing a voltage rise. <\/p>\n<ol>\n<li><strong>PCM Output Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Disconnect the actuator harness (engine off, battery disconnected). Apply 12 V to the PCM output pin and monitor the voltage with a scope. A stable 12 V indicates a healthy driver; spikes above 12 V suggest PCM failure. <\/p>\n<ol>\n<li><strong>Software Verification<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Using the manufacturer\u2019s diagnostic tool, check the PCM firmware version. Update to the latest calibration if a known issue with valve\u2011timing control exists. Re\u2011flash the PCM after any hardware repair to clear residual codes. <\/p>\n<ol>\n<li><strong>Repair or Replace the Actuator<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the actuator fails the bench test (excessive resistance, internal short), replace it. Re\u2011install the connector, torque to spec, and re\u2011run the live data test. <\/p>\n<ol>\n<li><strong>Repair Wiring\/Connectors<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Replace damaged harness sections, clean corroded pins with electrical contact cleaner, and apply dielectric grease to prevent future corrosion. <\/p>\n<ol>\n<li><strong>PCM Repair vs. Replacement<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When the PCM output driver is defective, repair is rarely cost\u2011effective. Replacement of the PCM is recommended. <\/p>\n<ol>\n<li><strong>Re\u2011programming<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; After any hardware change, the PCM must be programmed with the vehicle\u2011specific VIN and the correct calibration file. A professional scan tool or a Flagship One\u2011provided pre\u2011programmed module can complete this step. <\/p>\n<p>Typical labor for a full diagnosis and repair ranges from $150\u2011$250. Actuator replacement costs $200\u2011$350 plus labor. PCM replacement (including programming) averages $800\u2011$1,200 for the module and $200\u2011$300 for labor. <\/p>\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>Repeated actuator or wiring failures often indicate an underlying PCM issue. A PCM that intermittently drives excessive voltage can damage the actuator repeatedly, leading to a cycle of parts replacement. When the PCM\u2019s output driver has failed, the most reliable solution is a full module swap. <\/p>\n<p>Modern control modules integrate engine management, emissions control, and security functions. Selecting a replacement is not just about hardware; it requires exact VIN matching, correct software calibration, and compliance with anti\u2011tamper protocols. <\/p>\n<p><strong>Flagship One specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by a comprehensive warranty.<\/strong> Their inventory includes pre\u2011programmed PCM units that are matched to your vehicle\u2019s production date and software version, eliminating dealer programming delays. Professional technicians can install the module and complete final calibration in a single service visit, ensuring the power\u2011train operates as engineered. <\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Inspect wiring harnesses<\/strong> every 30 000 mi, focusing on heat\u2011exposed sections near the exhaust manifold. Replace any compromised sections promptly. <\/li>\n<li><strong>Keep connectors dry<\/strong> by applying dielectric grease after cleaning; moisture is a leading cause of high\u2011voltage spikes. <\/li>\n<li><strong>Maintain proper coolant levels<\/strong>; overheating can degrade insulation on valve\u2011actuator wiring. <\/li>\n<li><strong>Update PCM software<\/strong> at the manufacturer\u2019s recommended intervals (often every 60 000 mi) to benefit from bug fixes related to valve\u2011timing control. <\/li>\n<li><strong>Use OEM\u2011specified oil and additives<\/strong> that do not degrade the actuator\u2019s internal seals, preserving smooth operation.<\/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 loses power and flashes the check engine light from a Cylinder 6 Exhaust Valve Control Circuit High\u2014test and repair the circuit 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-518931","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>P3448 Code Symptoms, Causes, Diagnosis, Repair &amp; Reprogramming - 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-p3448-cylinder-6-exhaust-valve-control-circuit-high\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P3448 Code Symptoms, Causes, Diagnosis, Repair &amp; Reprogramming - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Your vehicle loses power and flashes the check engine light from a Cylinder 6 Exhaust Valve Control Circuit High\u2014test and repair the circuit now today.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-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=\"2025-12-11T08:11:13+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-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/\"},\"author\":{\"name\":\"FlagshipOne\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\"},\"headline\":\"P3448 Code Symptoms, Causes, Diagnosis, Repair &#038; Reprogramming\",\"datePublished\":\"2025-12-11T08:11:13+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/\"},\"wordCount\":1121,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-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-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/\",\"name\":\"P3448 Code Symptoms, Causes, Diagnosis, Repair & Reprogramming - Flagship One Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"datePublished\":\"2025-12-11T08:11:13+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-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-p3448-cylinder-6-exhaust-valve-control-circuit-high\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"P3448 Code Symptoms, Causes, Diagnosis, Repair &#038; Reprogramming\"}]},{\"@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":"P3448 Code Symptoms, Causes, Diagnosis, Repair & Reprogramming - 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-p3448-cylinder-6-exhaust-valve-control-circuit-high\/","og_locale":"en_US","og_type":"article","og_title":"P3448 Code Symptoms, Causes, Diagnosis, Repair & Reprogramming - Flagship One Blog","og_description":"Your vehicle loses power and flashes the check engine light from a Cylinder 6 Exhaust Valve Control Circuit High\u2014test and repair the circuit now today.","og_url":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/","og_site_name":"Flagship One Blog","article_publisher":"https:\/\/www.facebook.com\/flagshipone","article_author":"https:\/\/www.facebook.com\/flagshipone\/","article_published_time":"2025-12-11T08:11:13+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-p3448-cylinder-6-exhaust-valve-control-circuit-high\/#article","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/"},"author":{"name":"FlagshipOne","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700"},"headline":"P3448 Code Symptoms, Causes, Diagnosis, Repair &#038; Reprogramming","datePublished":"2025-12-11T08:11:13+00:00","mainEntityOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/"},"wordCount":1121,"commentCount":0,"publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-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-p3448-cylinder-6-exhaust-valve-control-circuit-high\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/","url":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/","name":"P3448 Code Symptoms, Causes, Diagnosis, Repair & Reprogramming - Flagship One Blog","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/#primaryimage"},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/#primaryimage"},"thumbnailUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","datePublished":"2025-12-11T08:11:13+00:00","breadcrumb":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-high\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p3448-cylinder-6-exhaust-valve-control-circuit-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-p3448-cylinder-6-exhaust-valve-control-circuit-high\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.fs1inc.com\/blog\/"},{"@type":"ListItem","position":2,"name":"P3448 Code Symptoms, Causes, Diagnosis, Repair &#038; Reprogramming"}]},{"@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\/518931","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=518931"}],"version-history":[{"count":0,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/518931\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/media?parent=518931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/categories?post=518931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/tags?post=518931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}