{"id":518334,"date":"2025-12-10T17:56:04","date_gmt":"2025-12-10T22:56:04","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/"},"modified":"2025-12-10T17:56:04","modified_gmt":"2025-12-10T22:56:04","slug":"dtc-p2351-cylinder-9-combustion-performance","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/","title":{"rendered":"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks &#038; Cost Estimate"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">P2351<\/div>\n<h1>P2351 Code Symptoms, Causes, Diagnosis, Safety Risks &amp; Cost Estimate<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>**Code definition:** P2351 \u2013 Cylinder 9 Combustion Performance <\/li>\n<li>**Typical warning:** Check\u2011engine light illuminated; may flash on misfire\u2011related codes <\/li>\n<li>**Common driver observations:** Rough idle, loss of power under load, increased fuel consumption, higher emissions <\/li>\n<li>**Primary culprit:** ECM\/PCM\u2011controlled fuel, spark, and air\u2011flow management for cylinder 9 <\/li>\n<li>**First\u2011step solution:** Scan, verify module data, and perform a module\u2011communication test before considering hardware replacement <\/li>\n<\/ul>\n<\/div>\n<p>Drivers who see a P2351 code usually notice that the engine does not run as smoothly as it should. The check\u2011engine light may appear steady or flash, especially when the engine is under load. A rough idle, a sudden dip in power when accelerating, and a subtle rise in fuel consumption are frequent clues that cylinder 9 is not completing its combustion cycle efficiently. Because the fault is logged by the power\u2011train control module, the issue is tied to how the ECM (engine control module) commands fuel injection, ignition timing, and sensor feedback for that specific cylinder.<\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Check\u2011engine light (CEL) on or flashing<\/strong> \u2013 the most immediate indicator that the ECM has detected abnormal combustion in cylinder 9. <\/li>\n<li><strong>Rough idle<\/strong> \u2013 engine speed may fluctuate between 600\u2013800 rpm and feel uneven. <\/li>\n<li><strong>Loss of power under load<\/strong> \u2013 noticeable when climbing hills, towing, or accelerating hard; the vehicle may feel \u201chesitant.\u201d <\/li>\n<li><strong>Increased fuel consumption<\/strong> \u2013 the engine compensates for the inefficient cylinder by adding more fuel, often 2\u20135 % higher than normal. <\/li>\n<li><strong>Elevated emissions<\/strong> \u2013 O\u2082 sensor readings may show a rich condition, leading to higher tailpipe CO\u2082 and HC levels. <\/li>\n<\/ul>\n<p>While a faulty fuel injector, spark plug, or oxygen sensor could also produce similar symptoms, the P2351 definition points specifically to a combustion\u2011performance fault reported by the ECM for cylinder 9. Therefore, the diagnostic focus should begin with the control module and its communication pathways.<\/p>\n<h2>Why Cylinder 9 Combustion Performance Problems Occur <\/h2>\n<h3>1. ECM Data Corruption or Software Glitch <\/h3>\n<p>The ECM stores calibration tables that dictate fuel quantity, spark timing, and valve timing for each cylinder. Corruption of the cylinder\u20119 entry\u2014due to a failed flash write, voltage spike, or incomplete reprogramming\u2014causes the module to command incorrect parameters, leading to incomplete combustion.<\/p>\n<h3>2. Internal Module Component Failure <\/h3>\n<p>Circuit\u2011board failures such as cracked traces, damaged driver transistors, or degraded memory cells can isolate cylinder\u20119 control signals. When the ECM cannot reliably drive the injector or ignition coil for that cylinder, the combustion event becomes weak or absent.<\/p>\n<h3>3. Communication Fault Between Sensors and ECM <\/h3>\n<p>The crankshaft position sensor, camshaft sensor, and cylinder\u2011pressure sensor (if equipped) feed timing data to the ECM. Intermittent wiring faults, connector corrosion, or grounding issues can cause the module to misinterpret cylinder\u20119 timing, resulting in poor combustion performance.<\/p>\n<h3>4. Power\u2011Supply Instability to the ECM <\/h3>\n<p>Voltage drops below the ECM\u2019s minimum operating range (typically 9 V\u201314 V) can cause the module to reset or enter a fail\u2011safe mode. Repeated resets may leave cylinder\u2011specific calibration data incomplete, triggering the P2351 code.<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Read and Clear Codes<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a professional OBD\u2011II scanner capable of bi\u2011directional communication. Record the freeze\u2011frame data for cylinder 9 (fuel trim, ignition advance, sensor voltages). Clear the code and perform a drive cycle to verify recurrence.<\/p>\n<ol>\n<li><strong>Verify Sensor Health<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Inspect crankshaft and camshaft position sensor signals with an oscilloscope. Confirm voltage and frequency specifications (typically 0.5\u20135 V AC ripple). Replace only if out\u2011of\u2011spec; otherwise, proceed to module testing.<\/p>\n<ol>\n<li><strong>Perform ECM Communication Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Use the scanner\u2019s \u201cmodule test\u201d function to check communication integrity between the ECM and the vehicle\u2019s CAN bus. Look for error frames or timeouts that indicate wiring or grounding problems.<\/p>\n<ol>\n<li><strong>Execute Cylinder\u2011Specific Data Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Many advanced scanners allow live data for each cylinder\u2019s fuel injector pulse width and ignition timing. Compare cylinder 9 values to the other eight cylinders. A deviation greater than 10 % suggests module\u2011level mis\u2011calibration.<\/p>\n<ol>\n<li><strong>Run a Power\u2011Supply Voltage Check<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Measure battery voltage at the ECM connector while the engine is running. Voltage should remain between 13.5 V and 14.5 V. Persistent drops below 12 V warrant a charging\u2011system review, but the focus remains on ensuring stable ECM power.<\/p>\n<ol>\n<li><strong>Re\u2011flash or Update ECM Software<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the module\u2019s software version is outdated or known to have cylinder\u20119 calibration issues, perform an official re\u2011flash using the manufacturer\u2019s programming tool. This step often resolves data\u2011corruption faults without hardware replacement.<\/p>\n<ol>\n<li><strong>Module Repair Evaluation<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Should the ECM fail the communication test or exhibit internal component failure (e.g., cracked traces), a qualified repair shop can attempt board\u2011level repair. Costs typically range from $200\u2013$400 for labor and parts, but success is not guaranteed for severe damage.<\/p>\n<ol>\n<li><strong>Consider Replacement<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When diagnostics confirm irreparable ECM damage or persistent faults after re\u2011flashing, replace the control module. Replacement units vary by production date and software version; the correct module is matched by VIN before programming.<\/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>Modern control modules are complex and integrated with security, immobilizer, and emissions systems. Replacing a faulty ECM is not merely swapping a circuit board; it requires precise VIN\u2011matched programming to ensure all vehicle functions communicate correctly. <\/p>\n<p><strong>Flagship One specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by warranty.<\/strong> Their modules are pre\u2011programmed to the exact specifications of your vehicle, eliminating the need for dealer\u2011level re\u2011coding. This approach reduces downtime and guarantees compatibility with the vehicle\u2019s network architecture.<\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Maintain clean electrical connections<\/strong> \u2013 Periodically inspect the ECM harness for corrosion, moisture, or loose pins. Use dielectric grease on connectors to guard against oxidation. <\/li>\n<li><strong>Monitor battery health<\/strong> \u2013 A healthy battery and charging system keep ECM voltage within spec, reducing the risk of power\u2011supply\u2011related resets. <\/li>\n<li><strong>Update software regularly<\/strong> \u2013 Subscribe to manufacturer service bulletins that address ECM calibration updates, especially those affecting cylinder\u2011specific performance. <\/li>\n<li><strong>Avoid extreme voltage spikes<\/strong> \u2013 Install a surge protector or voltage regulator if you frequently operate accessories that draw large currents (e.g., high\u2011output lighting).<\/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>Loss of power in cylinder 9 on your vehicle? Poor combustion can damage the engine\u2014scan the P2351, verify module data, and plan repair 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-518334","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>P2351 Code Symptoms, Causes, Diagnosis, Safety Risks &amp; Cost Estimate - 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-p2351-cylinder-9-combustion-performance\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks &amp; Cost Estimate - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Loss of power in cylinder 9 on your vehicle? Poor combustion can damage the engine\u2014scan the P2351, verify module data, and plan repair now today.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/\" \/>\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=\"2025-12-10T22:56:04+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=\"5 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-p2351-cylinder-9-combustion-performance\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/\"},\"author\":{\"name\":\"FlagshipOne\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\"},\"headline\":\"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks &#038; Cost Estimate\",\"datePublished\":\"2025-12-10T22:56:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/\"},\"wordCount\":1061,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/#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-p2351-cylinder-9-combustion-performance\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/\",\"name\":\"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks & Cost Estimate - Flagship One Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"datePublished\":\"2025-12-10T22:56:04+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p2351-cylinder-9-combustion-performance\\\/#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-p2351-cylinder-9-combustion-performance\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks &#038; Cost Estimate\"}]},{\"@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":"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks & Cost Estimate - 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-p2351-cylinder-9-combustion-performance\/","og_locale":"en_US","og_type":"article","og_title":"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks & Cost Estimate - Flagship One Blog","og_description":"Loss of power in cylinder 9 on your vehicle? Poor combustion can damage the engine\u2014scan the P2351, verify module data, and plan repair now today.","og_url":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/","og_site_name":"Flagship One Blog","article_publisher":"https:\/\/www.facebook.com\/flagshipone","article_author":"https:\/\/www.facebook.com\/flagshipone\/","article_published_time":"2025-12-10T22:56:04+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":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/#article","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/"},"author":{"name":"FlagshipOne","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700"},"headline":"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks &#038; Cost Estimate","datePublished":"2025-12-10T22:56:04+00:00","mainEntityOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/"},"wordCount":1061,"commentCount":0,"publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/#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-p2351-cylinder-9-combustion-performance\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/","url":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/","name":"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks & Cost Estimate - Flagship One Blog","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/#primaryimage"},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/#primaryimage"},"thumbnailUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","datePublished":"2025-12-10T22:56:04+00:00","breadcrumb":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p2351-cylinder-9-combustion-performance\/#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-p2351-cylinder-9-combustion-performance\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.fs1inc.com\/blog\/"},{"@type":"ListItem","position":2,"name":"P2351 Code Symptoms, Causes, Diagnosis, Safety Risks &#038; Cost Estimate"}]},{"@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\/518334","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=518334"}],"version-history":[{"count":0,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/518334\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/media?parent=518334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/categories?post=518334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/tags?post=518334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}