{"id":536660,"date":"2026-07-19T00:01:32","date_gmt":"2026-07-19T04:01:32","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=536660"},"modified":"2026-07-19T00:01:32","modified_gmt":"2026-07-19T04:01:32","slug":"2020-toyota-avalon-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2020-toyota-avalon-pcm-replacement-guide\/","title":{"rendered":"2020 Toyota Avalon ECM Replacement: Location, Labor, Programming"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2020 Toyota Avalon ECM Replacement: Location, Labor, Programming<\/h1>\n<p class=\"hero-subtitle\">The Engine Control Module (ECM) in the 2020 Toyota Avalon 3.5L is the main computer that manages fuel injection, ignition timing, and emissions. Failure can cause no-start, stalling, poor performance, and trouble codes like P0606, indicating an internal module fault.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>The ECM is located next to the air cleaner assembly on the 2020 Toyota Avalon 3.5L.<\/li>\n<li>Factory book time for removing and replacing the PCM is 0.7 hours.<\/li>\n<li>Access requires removing the negative battery cable, intake duct seal, and air cleaner assembly.<\/li>\n<li>A relearn procedure of 0.5 hours is required after ECM replacement.<\/li>\n<li>Factory cautions include waiting time after turning off the engine before disconnecting the battery.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2020 Toyota Avalon 3.5L is experiencing engine performance issues or a check engine light, the Engine Control Module (ECM) may be the culprit. The ECM is the brain of your engine, controlling fuel delivery, spark timing, and emissions. When it fails, you may notice no-start, stalling, or a P0606 code. This guide covers where the ECM is located, what replacement involves using factory book times, and the programming steps required afterward. You will also learn common symptoms and how a pre-programmed replacement can save time.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2020 Toyota Avalon<\/h2>\n<p>The Engine Control Module (ECM) in the 2020 Toyota Avalon 3.5L is a dedicated computer that processes sensor data to optimize engine performance and emissions. It adjusts fuel injection, ignition timing, and variable valve timing based on driving conditions. A failing ECM can cause drivability problems and set internal trouble codes. If you need a replacement, consider <a href=\"https:\/\/www.fs1inc.com\/toyota-ecm-pcm-ecu-engine-computer\/avalon-engine-computers.html\">replacement ECMs for the 2020 Avalon<\/a> that come pre-programmed to your vehicle&#8217;s specifications, eliminating the need for dealer-level programming.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>The ECM on the 2020 Toyota Avalon 3.5L is located next to the air cleaner assembly. Factory book time for removing and replacing the PCM is 0.7 hours. Access requires disconnecting the cable from the negative battery terminal, then removing the cool air intake duct seal, the inlet air cleaner assembly, and the air cleaner assembly with the air cleaner hose. The factory cautions that after turning the engine switch off, a waiting time may be required before disconnecting the battery cable. After installation, a PCM relearn of 0.5 hours or an ECM reset of 0.3 hours may be necessary.<\/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\/blog\/wp-content\/uploads\/2026\/07\/2020-toyota-avalon-ecm-location-card.webp\" alt=\"2020 Toyota Avalon PCM location diagram\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">Typical PCM mounting area on the 2020 Toyota Avalon (reference).<\/figcaption><\/figure>\n<div style=\"background:#f7f9fc;border:1px solid #e2e8f2;border-radius:10px;padding:18px 24px;margin:18px 0\">\n<h3 style='margin-top:0'>How to Reach the PCM on the 2020 Toyota Avalon<\/h3>\n<ol style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\"><b>DISCONNECT<\/b> CABLE FROM NEGATIVE BATTERY TERMINAL Click here More Info.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>REMOVE<\/b> COOL AIR INTAKE DUCT SEAL Click here More Info.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>REMOVE<\/b> INLET AIR CLEANER ASSEMBLY Click here More Info.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>REMOVE<\/b> AIR CLEANER ASSEMBLY WITH AIR CLEANER HOSE Click here More Info.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Rotate<\/b> the 2 levers while pushing the locks, and disconnect the 2 ECM connectors.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the 2 bolts, nut and ECM.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the 2 screws and No.<\/li>\n<\/ol>\n<p style='margin:10px 0 0 0'><em>Work with the ignition off, and treat the module as static-sensitive: avoid touching the connector pins at any point.<\/em><\/p>\n<\/div>\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\">Powertrain Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/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\">All configurations<\/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\">All configurations<\/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\">All configurations<\/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\">Engine Control Module Reset<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.3 hr<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Programming Requirements After Replacement<\/h2>\n<p>After replacing the ECM on the 2020 Toyota Avalon 3.5L, the factory procedure requires a relearn or reset. The book times are 0.5 hours for a PCM relearn, 0.5 hours for an ECM relearn, and 0.3 hours for an ECM reset. These steps ensure the module adapts to your vehicle. However, when you order <a href=\"https:\/\/www.fs1inc.com\/2020-toyota-avalon-3-5l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">a VIN-programmed replacement unit<\/a> from Flagship One, those post-install procedures are already completed, so you can install and drive without additional programming.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>Common symptoms of a failing ECM on the 2020 Toyota Avalon 3.5L include no-start, intermittent stalling, misfire codes, and loss of communication with a scan tool. You may also notice poor fuel economy or erratic shifting. If the module has an internal fault, it may set <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0606-control-module-processor\/\">internal control module error P0606<\/a> which points to a problem within the ECM itself rather than an external sensor. Addressing these symptoms promptly can prevent further drivability issues.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2020 Toyota Avalon<\/h2>\n<p>When the ECM fails internally, it may set a diagnostic trouble code. For the 2020 Toyota Avalon 3.5L, the following module-internal code is documented. This code indicates a problem within the control module itself rather than an external sensor or circuit.<\/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-p0606-control-module-processor\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0606<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0606-control-module-processor\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module processor failure<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0606-control-module-processor\/\" style=\"color:#0563C1\"><b><u>Full P0606 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Protecting the PCM in Your 2020 Toyota Avalon<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Keep the battery and charging system in good condition to avoid voltage spikes that can damage the ECM.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Inspect and clean ground connections and ECM connector pins periodically to ensure good electrical contact.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump-starting your vehicle with a high-voltage source; use a quality battery charger instead.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any check engine light or trouble code promptly to prevent further module stress.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure the ECM connector seal is intact and free of moisture or corrosion.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>How long does it take to replace the ECM on a 2020 Toyota Avalon?<\/h3>\n<p>The factory book time for removing and replacing the PCM is 0.7 hours. Additional time may be needed for a relearn or reset procedure, which is listed at 0.5 hours for a PCM relearn and 0.3 hours for an ECM reset.<\/p>\n<h3>What is the P0606 code on a 2020 Toyota Avalon?<\/h3>\n<p>P0606 is a diagnostic trouble code that indicates an internal control module fault. On the 2020 Toyota Avalon 3.5L, this code typically means the ECM has an internal error and may need replacement.<\/p>\n<h3>Do I need to program a new ECM for my 2020 Toyota Avalon?<\/h3>\n<p>Yes, the factory procedure requires a relearn or reset after ECM replacement. However, a pre-programmed unit from Flagship One arrives with your VIN already loaded, so those steps are already completed.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2020 Toyota Avalon 3.5L ECM has failed, you have options: repair the original module or replace it with a refurbished unit. A refurbished ECM from Flagship One is a cost-effective solution that comes pre-programmed to your vehicle, saving you the time and expense of dealer-level programming. Consider this route for a reliable fix.<\/p>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2020-toyota-avalon-3-5l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2020 Toyota Avalon<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/toyota-ecm-pcm-ecu-engine-computer\/avalon-engine-computers.html\">Toyota Avalon module lineup<\/a> covers other engine configurations as well.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Final Thoughts<\/h2>\n<p>The 2020 Toyota Avalon 3.5L ECM is a critical component for engine management. If you suspect failure, a replacement from Flagship One that arrives pre-programmed for your vehicle can restore performance without additional programming steps. Trust a quality refurbished unit to get you back on the road.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>If your 2020 Toyota Avalon 3.5L has a P0606 code or no-start, the ECM may need replacement. Factory procedure requires battery disconnect wait time and relearn. Learn location and programming.<\/p>\n","protected":false},"author":1,"featured_media":522698,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[258,104],"tags":[676,515,96],"class_list":["post-536660","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-car","category-toyota","tag-676","tag-avalon","tag-toyota"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2020 Toyota Avalon ECM Replacement: Location, Labor, Programming - 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\/2020-toyota-avalon-pcm-replacement-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2020 Toyota Avalon ECM Replacement: Location, Labor, Programming - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"If your 2020 Toyota Avalon 3.5L has a P0606 code or no-start, the ECM may need replacement. 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