{"id":531141,"date":"2026-07-17T13:09:14","date_gmt":"2026-07-17T17:09:14","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=531141"},"modified":"2026-07-17T13:09:14","modified_gmt":"2026-07-17T17:09:14","slug":"2009-infiniti-m35-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2009-infiniti-m35-pcm-replacement-guide\/","title":{"rendered":"2009 Infiniti M35 Engine Control Module Relearn Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2009 Infiniti M35 Engine Control Module Relearn Guide<\/h1>\n<p class=\"hero-subtitle\">In the 2009 Infiniti M35, the Engine Control Module (ECM) manages fuel injection, ignition timing, and emissions. Failure can lead to poor fuel economy, rough idle, or engine stalling.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>The ECM controls fuel delivery and ignition.<\/li>\n<li>Relearn resets calibration after replacement.<\/li>\n<li>Replacement requires 0.5\u2011hour labor.<\/li>\n<li>Grounding the ECM during checks may damage it.<\/li>\n<li>The 2009 Infiniti M35 uses a single module for both engine and powertrain.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>Your 2009 Infiniti M35 may experience unexpected idling, stalling, or engine misfires, often traced back to the Engine Control Module. This guide explains what the ECM does, where it sits, and how to replace or relearn it without risking further damage. By following these steps, you\u2019ll understand the module\u2019s role, the labor involved, and the precautions needed during voltage testing. You\u2019ll also learn how to interpret the P0605 code and what to expect after the replacement. With this knowledge, you can confidently address the issue or seek professional assistance if needed.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2009 Infiniti M35<\/h2>\n<p>The Engine Control Module in the 2009 Infiniti M35 is the central computer that orchestrates fuel injection, ignition timing, and emissions control. It receives data from sensors such as crankshaft position, oxygen sensors, and throttle position, then adjusts engine parameters to maintain performance and efficiency. <a href=\"https:\/\/www.fs1inc.com\/nissan-pcm-ecm-ecu-engine-computer\/infiniti-pcm-ecm-ecu-engine-computer\/m35-engine-computers.html\">2009 Infiniti M35 Engine Control Module<\/a> The module\u2019s firmware ensures that the engine runs smoothly under varying loads. When the ECM fails, it may cause a loss of communication with diagnostic tools, erratic throttle response, or a complete failure to start. The ECU\u2019s health is therefore critical to overall vehicle operation, and any malfunction can trigger the P0605 internal code.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What Replacing the PCM Involves<\/h2>\n<table style=\"width:100%;border-collapse:collapse;margin:18px 0;font-size:15px\">\n<tr>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Operation<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Configuration<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Book Time<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">M45<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">M35<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">M45<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">1.1 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">M35<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.7 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">M45<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">M35<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">M45<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">1.1 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">M35<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">1.4 hr<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Programming Requirements After Replacement<\/h2>\n<p>After installing a new 2009 Infiniti M35 Engine Control Module, a relearn procedure is required to synchronize the module with the vehicle\u2019s systems. Flagship One units arrive VIN\u2011programmed, so the factory relearn steps are already completed. The installer can simply proceed to the next service step without additional programming steps. <a href=\"https:\/\/www.fs1inc.com\/2009-infiniti-m35-3-5l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">VIN\u2011programmed replacement unit<\/a> for the correct application.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>Common signs that the 2009 Infiniti M35\u2019s ECM may be compromised include a rough idle, engine stalling, or misfire codes. The vehicle may also fail to start or exhibit a dead scan\u2011tool communication. When the <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\">P0605<\/a> code appears, it signals an internal fault within the module, often linked to a damaged or improperly grounded component. Ignoring these symptoms can lead to further mechanical issues or costly repairs.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2009 Infiniti M35<\/h2>\n<p>The 2009 Infiniti M35 may report internal module codes that indicate a fault within the Engine Control Module. Understanding these codes helps pinpoint the root cause of performance problems.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:18px 0;font-size:15px\">\n<tr>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Code<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Meaning<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Full Guide<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0605<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Internal ROM error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#0563C1\"><b><u>Full P0605 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Protecting the PCM in Your 2009 Infiniti M35<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Keep the charging system in good condition to avoid voltage spikes.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Inspect and clean all electrical connectors and grounds regularly.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Never ground the ECM terminals while measuring voltage.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any diagnostic codes promptly to prevent further damage.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure connector seals remain intact to protect against moisture.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump\u2011starting the vehicle with a high\u2011current source that could overload the ECM.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>Can I replace the Engine Control Module on my 2009 Infiniti M35 without a relearn?<\/h3>\n<p>The module requires a relearn after installation to sync with the vehicle\u2019s sensors. Without this step, the engine may run poorly or fail to start.<\/p>\n<h3>What does the P0605 code mean for my 2009 Infiniti M35?<\/h3>\n<p>P0605 indicates an internal fault within the Engine Control Module, often due to a damaged component or incorrect grounding during maintenance.<\/p>\n<h3>Is it safe to check voltage on the ECM terminals of my 2009 Infiniti M35?<\/h3>\n<p>You should avoid grounding the ECM terminals during voltage checks; doing so may damage the module\u2019s transistor.<\/p>\n<h3>How long does it take to install a new Engine Control Module in the 2009 Infiniti M35?<\/h3>\n<p>The factory book time for replacement is 0.5 hours, covering removal, installation, and basic checks.<\/p>\n<h3>Will a VIN\u2011programmed replacement module eliminate the relearn step?<\/h3>\n<p>Yes, a VIN\u2011programmed unit comes pre\u2011configured, so the relearn steps are already completed and no additional programming is needed.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2009 Infiniti M35\u2019s Engine Control Module is showing signs of failure, you can opt for a quick replacement or a refurbished unit that matches the original specifications. Both options can restore reliable engine performance while keeping costs manageable. Consider the benefits of a factory\u2011programmed unit versus a refurbished module that has been thoroughly tested.<\/p>\n<figure style=\"margin:22px auto;text-align:center;max-width:720px\"><img decoding=\"async\" style=\"max-width:100%;height:auto;border:1px solid #e2e6ec;border-radius:8px\" src=\"https:\/\/www.fs1inc.com\/media\/wysiwyg\/googleshop\/nissannsh30e\/nissan-ns-h30e-1.jpg\" alt=\"Refurbished VIN-programmed PCM for the 2009 Infiniti M35\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">A refurbished, VIN-programmed replacement PCM for the 2009 Infiniti M35 from Flagship One.<\/figcaption><\/figure>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2009-infiniti-m35-3-5l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2009 Infiniti M35<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/nissan-pcm-ecm-ecu-engine-computer\/infiniti-pcm-ecm-ecu-engine-computer\/m35-engine-computers.html\">Infiniti M35 module lineup<\/a> covers other engine configurations as well.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Final Thoughts<\/h2>\n<p>For your 2009 Infiniti M35, a reliable Engine Control Module is essential for smooth operation. By understanding the module\u2019s role, addressing the P0605 code, and following proper replacement procedures, you can keep your vehicle running efficiently. Reach out for expert assistance if you encounter any complications during the replacement process.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>If your 2009 Infiniti M35 stalls or misfires, avoid damaging the ECM by not grounding its terminals during voltage checks. Relearn the module to restore proper operation.<\/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":[258,319],"tags":[264,320,574],"class_list":["post-531141","post","type-post","status-publish","format-standard","hentry","category-car","category-infiniti","tag-264","tag-infiniti","tag-m35"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2009 Infiniti M35 Engine Control Module Relearn 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\/2009-infiniti-m35-pcm-replacement-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2009 Infiniti M35 Engine Control Module Relearn Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"If your 2009 Infiniti M35 stalls or misfires, avoid damaging the ECM by not grounding its terminals during voltage checks. 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