{"id":528537,"date":"2026-07-17T02:04:37","date_gmt":"2026-07-17T06:04:37","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=528537"},"modified":"2026-08-25T13:51:35","modified_gmt":"2026-08-25T17:51:35","slug":"2020-mitsubishi-mirage-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2020-mitsubishi-mirage-pcm-replacement-guide\/","title":{"rendered":"2020 Mitsubishi Mirage PCM Failure: Symptoms, Replacement, and Costs"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2020 Mitsubishi Mirage PCM Failure: Symptoms, Replacement, and Costs<\/h1>\n<p class=\"hero-subtitle\">The powertrain control module (PCM) in your 2020 Mitsubishi Mirage manages engine performance, fuel delivery, and transmission behavior. When it fails, you may experience stalling, rough idling, or a no-start condition, often accompanied by internal fault codes like P0606.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>The PCM controls critical engine and transmission functions in the 2020 Mirage.<\/li>\n<li>Replacement typically requires 1.4 hours of labor for removal and reinstallation.<\/li>\n<li>A relearn procedure (0.5 hours) is needed after installation to sync the module with the vehicle.<\/li>\n<li>Flagship One units arrive VIN-programmed, eliminating the need for additional programming steps.<\/li>\n<li>Common symptoms include stalling, misfires, and communication errors with scan tools.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2020 Mitsubishi Mirage has been acting up\u2014stalling unexpectedly, refusing to start, or throwing cryptic check-engine lights\u2014you might be dealing with a failing powertrain control module (PCM). This small but critical computer oversees everything from fuel injection to transmission shifting, and when it malfunctions, your vehicle\u2019s performance can suffer in noticeable ways. Replacing it isn\u2019t just about swapping a part; it involves careful removal, reinstallation, and a relearn process to ensure the new module communicates properly with the rest of the car. Understanding what the PCM does, where it\u2019s located, and what to expect during replacement can help you make informed decisions, whether you\u2019re tackling the job yourself or working with a shop. With the right preparation, you can avoid unnecessary delays and get your Mirage running smoothly again.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2020 Mitsubishi Mirage<\/h2>\n<p>The powertrain control module in your 2020 Mitsubishi Mirage serves as the brain of the engine and transmission systems. It continuously monitors sensors throughout the vehicle, adjusting fuel delivery, ignition timing, and shift points to optimize performance and efficiency. Without a functioning PCM, your Mirage may struggle to start, idle roughly, or even enter a limp-home mode to prevent further damage. This module is particularly important in modern vehicles, where precise control over emissions and fuel economy is required. If the PCM fails, you\u2019ll likely notice symptoms like hesitation under acceleration or unexplained stalling, often accompanied by a check-engine light. Replacing it involves installing one of the <a href=\"https:\/\/www.fs1inc.com\/chrysler-dodge-plymouth\/mitsubishi-pcm-ecm-ecu-engine-computer\/mirage-engine-computers.html\">replacement engine computers for the Mirage<\/a>, which must be programmed to match your vehicle\u2019s specific configuration. While the PCM is built to last, exposure to voltage spikes, moisture, or extreme temperatures can shorten its lifespan.<\/p>\n<\/div>\n<div class=\"info-section\">\n<div style=\"margin:36px 0;padding:46px 26px;background:#102844 url(https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2026\/08\/fs1-engine-computer-collage-bg-1.webp) center\/cover no-repeat;border-radius:12px;text-align:center\">\n<p style=\"margin:0 0 10px;color:#ffd27a;font-size:14px;letter-spacing:2px;text-transform:uppercase\">2020 Mitsubishi Mirage<\/p>\n<p style=\"margin:0 auto 22px;max-width:560px;color:#ffffff;font-size:22px;font-weight:700;line-height:1.35\">OEM programmed replacements &mdash; plug &amp; play, no dealer visit.<\/p>\n<p><a href=\"https:\/\/www.fs1inc.com\/engine-control-modules.html?ref=blog-cta\" style=\"display:inline-block;background:#f0ad2d;color:#102844;font-weight:700;padding:14px 34px;border-radius:8px;text-decoration:none;font-size:16px\">Find yours by year, make &amp; model &rarr;<\/a><\/p>\n<p style=\"margin:14px 0 0;color:#c3d0dd;font-size:13px\">Free shipping &middot; Lifetime warranty<\/p>\n<\/div>\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>In the 2020 Mitsubishi Mirage, the PCM is located in the engine bay, typically mounted near the firewall or on the driver\u2019s side fender well. Accessing it requires removing a few plastic covers and possibly the air intake duct to reach the module\u2019s mounting bolts. The factory labor guide allocates 1.4 hours for removal and reinstallation (R&amp;R) of the PCM, which includes disconnecting the battery, unplugging the wiring harness, and carefully extracting the module without damaging the connectors. Once the old unit is out, the new PCM is bolted into place, and the wiring harness is reconnected. After physical installation, a relearn procedure is required to synchronize the module with the vehicle\u2019s sensors and systems, which adds another 0.5 hours of labor. Torque specifications for the mounting bolts are critical to prevent damage to the module or its housing, though exact values aren\u2019t always published in standard labor guides.<\/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\">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\">1.4 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 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<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\">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 replacing the PCM in your 2020 Mitsubishi Mirage, the factory procedure requires a relearn process to ensure the new module communicates correctly with the engine, transmission, and other onboard systems. This typically involves using a scan tool to reset adaptive values, relearn throttle position, and synchronize the immobilizer system. The process can take up to 0.5 hours, depending on the vehicle\u2019s response and the technician\u2019s familiarity with the procedure. However, when you install a <a href=\"https:\/\/www.fs1inc.com\/2020-mitsubishi-mirage-1-2l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">VIN-programmed replacement unit<\/a> from Flagship One, these steps are already completed. The module arrives pre-configured to your Mirage\u2019s specific VIN, eliminating the need for additional programming or relearn procedures. This not only saves time but also reduces the risk of errors during the installation process, ensuring your vehicle starts and runs as expected right after the swap.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>A failing PCM in your 2020 Mitsubishi Mirage can manifest in several ways, often mimicking other mechanical or electrical issues. One of the most common signs is a no-start condition, where the engine cranks but refuses to fire, sometimes accompanied by a flashing security light. You may also experience intermittent stalling, particularly at idle or during low-speed driving, as the module struggles to maintain consistent fuel and spark delivery. Hesitation under acceleration or sudden surges in engine speed can indicate the PCM is misinterpreting sensor data, leading to erratic performance. Another telltale symptom is a check-engine light with a stored <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0606-control-module-processor\/\">internal processor fault<\/a>, which suggests the module\u2019s internal circuitry is failing. In some cases, the vehicle may enter a limp-home mode, limiting engine power to prevent further damage. Scan tool communication issues, such as the inability to retrieve codes or live data, can also point to a failing PCM, as the module acts as the gateway for diagnostic tools. If you notice any of these symptoms, it\u2019s worth having the PCM checked, especially if other potential causes like fuel pump failure or ignition system issues have been ruled out.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2020 Mitsubishi Mirage<\/h2>\n<p>The 2020 Mitsubishi Mirage may store specific trouble codes when the PCM begins to fail. These codes are often module-internal faults that don\u2019t point to a single sensor or component but instead indicate a problem with the PCM itself. Addressing these codes promptly can prevent further drivability issues.<\/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 Mitsubishi Mirage<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Keep your Mirage\u2019s battery and charging system in good condition to avoid voltage spikes that can damage the PCM.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure all electrical connectors, especially those near the PCM, are clean, dry, and securely fastened to prevent corrosion or poor contact.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump-starting the vehicle with improper voltage, as this can overload the PCM\u2019s sensitive electronics.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address check-engine lights or drivability issues promptly to prevent secondary damage to the PCM or other components.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">If you\u2019re working on the vehicle\u2019s electrical system, disconnect the battery to avoid accidental short circuits that could harm the PCM.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Regularly inspect the PCM\u2019s mounting area for signs of moisture or debris, which can lead to corrosion or overheating.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>How do I know if my 2020 Mitsubishi Mirage PCM is bad or if it\u2019s just a sensor issue?<\/h3>\n<p>A failing PCM often triggers multiple unrelated codes or causes symptoms that don\u2019t align with a single sensor failure, such as stalling, no-start conditions, or scan tool communication errors. If you\u2019ve replaced sensors or checked wiring without resolving the issue, the PCM itself may be the culprit. A professional diagnosis can confirm whether the module is at fault.<\/p>\n<h3>Can I drive my Mirage with a bad PCM, or will it cause more damage?<\/h3>\n<p>Driving with a failing PCM can lead to further issues, such as poor fuel economy, engine misfires, or even transmission damage if the module sends incorrect signals. In some cases, the vehicle may enter limp-home mode, limiting performance to prevent harm. It\u2019s best to address PCM problems as soon as possible to avoid costly repairs down the line.<\/p>\n<h3>Do I need to reprogram a new PCM for my 2020 Mirage, or can I just swap it in?<\/h3>\n<p>A new PCM must be programmed to your Mirage\u2019s VIN and configured to work with its specific engine and transmission setup. While the factory procedure requires a relearn process after installation, a pre-programmed unit from Flagship One arrives ready to install, saving you time and potential headaches during the swap.<\/p>\n<h3>What\u2019s the difference between a PCM reset and a PCM relearn for my Mirage?<\/h3>\n<p>A PCM reset, which takes about 0.3 hours, clears temporary data like fuel trims and adaptive values, often resolving minor drivability issues. A PCM relearn, which takes 0.5 hours, is a more comprehensive procedure that synchronizes the module with the vehicle\u2019s sensors and systems, ensuring proper communication after replacement. Both are necessary in different scenarios, but a relearn is typically required when installing a new PCM.<\/p>\n<h3>Is it worth replacing the PCM in my 2020 Mirage, or should I consider a used one to save money?<\/h3>\n<p>While a used PCM may seem like a cost-effective option, it carries risks like unknown mileage, potential internal damage, or compatibility issues. A new or remanufactured unit from a reputable supplier ensures reliability and comes with a warranty, giving you peace of mind. If your Mirage is otherwise in good condition, investing in a quality replacement is often the better long-term choice.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2020 Mitsubishi Mirage is showing signs of PCM failure, you have a few options to consider. A repair shop can diagnose and replace the module, though labor and programming costs can add up quickly. Alternatively, a pre-programmed replacement unit from Flagship One eliminates the need for additional programming, reducing installation time and complexity. Whether you opt for a new or remanufactured module, choosing a VIN-specific unit ensures compatibility and reliability, helping you get back on the road with minimal downtime.<\/p>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2020-mitsubishi-mirage-1-2l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2020 Mitsubishi Mirage<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/chrysler-dodge-plymouth\/mitsubishi-pcm-ecm-ecu-engine-computer\/mirage-engine-computers.html\">Mitsubishi Mirage 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 powertrain control module in your 2020 Mitsubishi Mirage plays a critical role in keeping your engine running smoothly and efficiently. When it fails, symptoms like stalling, no-start conditions, or a check-engine light with a P0606 code can leave you stranded or frustrated. Replacing the PCM involves careful installation and a relearn procedure, but opting for a pre-programmed unit can simplify the process. If you\u2019re experiencing drivability issues, don\u2019t overlook the PCM as a potential cause\u2014addressing it promptly can save you time and money in the long run.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Is your 2020 Mitsubishi Mirage stalling, failing to start, or throwing a P0606 code? Learn how the powertrain control module works, where it\u2019s located, and what replacement involves\u2014plus why a pre-programmed unit saves time and hassle.<\/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":[258,295],"tags":[676,825,296],"class_list":["post-528537","post","type-post","status-publish","format-standard","hentry","category-car","category-mitsubishi","tag-676","tag-mirage","tag-mitsubishi"],"acf":{"sku":"","year":"","make":"","model":"","post_title":"","featured_image":null,"introduction":"","what_is_pcm_programming":"","signs_your_year_make_model_needs_pcm_programming":"","product_title":"","product_view_link":"","how_pcm_programming_works_for_year_make_model":"","engine_size":"","engine_size_1_url":"","engine_size_2":"","engine_size_2_url":"","description":"","body_reported_problems":"","body_analysis":"","brake_system_reported_problems":"","brake_system_analysis":"","heating_&_cooling_reported_problems":"","heating_&_cooling_analysis":"","drivetrain_reported_problems":"","drivetrain_reported_analysis":"","interior_electronics_reported_problems":"","interior_electronics_analysis":"","cooling_system_reported_problems":"","cooling_system_analysis":"","ignition_&_wiring_reported_problems":"","ignition_&_wiring_analysis":"","engine_repairs_reported_problems":"","engine_repairs_analysis":"","exhaust_system_reported_problems":"","exhaust_system_analysis":"","fuel_&_emissions_reported_problems":"","fuel_&_emissions_analysis":"","onboard_electronics_reported_problems":"","onboard_electronics_analysis":"","strange_sounds_&_leaks_reported_problems":"","strange_sounds_&_leaks_analysis":"","exterior_finish_reported_problems":"","exterior_finish_analysis":"","suspension_&_steering_reported_problems":"","suspension_&_steering_analysis":"","transmission_repairs_reported_problems":"","transmission_repairs_analysis":"","conclusion":"","image":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2020 Mitsubishi Mirage PCM Failure: Symptoms, Replacement, and Costs<\/title>\n<meta name=\"description\" content=\"Replacing the 2020 Mitsubishi Mirage engine computer: step-by-step removal, install tips, and plug &amp; 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