{"id":525085,"date":"2026-07-17T08:40:04","date_gmt":"2026-07-17T12:40:04","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=525085"},"modified":"2026-07-19T11:36:26","modified_gmt":"2026-07-19T15:36:26","slug":"2020-fiat-124-spider-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2020-fiat-124-spider-pcm-replacement-guide\/","title":{"rendered":"2020 Fiat 124 Spider PCM Relearn &#038; Reset Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2020 Fiat 124 Spider PCM Relearn &amp; Reset Guide<\/h1>\n<p class=\"hero-subtitle\">In the 2020 Fiat 124 Spider, the Powertrain Control Module coordinates engine and transmission functions. Failure often manifests as misfire, stalling, or a loss of power, because the PCM can no longer interpret sensor data or send commands to actuators.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>PCM replacement requires about 0.5 to 0.8 hours of labor per task.<\/li>\n<li>The control module sits next to the air cleaner assembly.<\/li>\n<li>Relearn and reset procedures are short and can be performed with standard tools.<\/li>\n<li>Flagship One units arrive pre\u2011programmed, so you skip factory re\u2011learning steps.<\/li>\n<li>Typical symptoms include engine hesitation, misfires, and generic powertrain codes.<\/li>\n<li><\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>You\u2019ve just noticed that your 2020 Fiat 124 Spider is acting up\u2014perhaps it\u2019s hesitating, stalling, or showing a P0601 code. These symptoms can point to a fault in the Powertrain Control Module, the brain that orchestrates engine timing, fuel delivery, and transmission shifts. Understanding how to replace and program this module can save you hours of troubleshooting and prevent a costly trip to the dealership. This guide walks you through the exact steps to remove, replace, and program the PCM, explains what to expect during the process, and highlights the common warning signs that indicate a PCM failure. By the end of this article, you\u2019ll know how to handle the module confidently and what to look for if your 124 Spider shows signs of malfunction.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2020 Fiat 124 Spider<\/h2>\n<p>The Powertrain Control Module in the 2020 Fiat 124 Spider is the central computing unit that manages engine performance and transmission behavior. It receives input from sensors such as the throttle position, engine temperature, and air flow, and it sends commands to actuators like fuel injectors, ignition coils, and shift solenoids. Proper functioning of the PCM ensures smooth acceleration, efficient fuel use, and accurate gear changes. When the PCM malfunctions, the car may experience misfires, sudden stalls, or a loss of power. <a href=\"https:\/\/www.fs1inc.com\/fiat-pcm-ecm-ecu-engine-computer.html\">replacement engine computers for the 124 Spider<\/a> is often needed when the PCM cannot be restored with a simple reset or relearn procedure. The module\u2019s health is critical because it interprets real\u2011time data to keep the vehicle running within design parameters.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>The PCM is located beside the air cleaner assembly inside the engine bay of the 2020 Fiat 124 Spider. To access it, you typically remove a few cover panels and disconnect the wiring harness. The recommended labor times for this work are 0.5 hours for a relearn, 0.8 hours for a reset, and 0.8 hours for a complete replacement. The removal procedure does not involve any specialized tools beyond the standard set for engine bay work. After the unit is removed, the new PCM can be installed in the same position and reconnected to the harness, followed by the factory relearn or reset as needed.<\/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-fiat-124-spider-ecm-location-card-1.webp\" alt=\"2020 Fiat 124 Spider PCM location diagram\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">Typical PCM mounting area on the 2020 Fiat 124 Spider (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 Fiat 124 Spider<\/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> and isolate the negative battery cable.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the air cleaner body.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the wire harness connector from the Powertrain Control Module.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the wire harness connector.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the screw.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Release<\/b> the wire harness retaining clips and reposition the harness.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Release<\/b> the wire harness retaining clips.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the wire harness from the PCM.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the screws.<\/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 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\">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\">0.8 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 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 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\">0.8 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 PCM, the factory requires a relearn or reset procedure to synchronize the module with the vehicle\u2019s current parameters. Because Flagship One units are delivered VIN\u2011programmed, those relearn steps are already completed, so you do not need to perform additional programming. This means you can simply install the new unit and reconnect the harness, then proceed with the standard reset or relearn if the vehicle\u2019s diagnostic tool indicates it is necessary. <a href=\"https:\/\/www.fs1inc.com\/2020-fiat-124-spider-1-4l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">a VIN-programmed replacement unit<\/a> ensures that your new PCM is ready for use without extra steps.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>A failing PCM in the 2020 Fiat 124 Spider may trigger several warning signs. You might notice the engine hesitating or stalling, especially under load or when accelerating. The vehicle could also exhibit a loss of power or inconsistent shifting. A common diagnostic code that points to a PCM issue is <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\">P0601<\/a>, which indicates a communication failure between the module and the vehicle\u2019s network. If you see this code or experience any of the symptoms above, it is wise to check the PCM and consider a replacement if the issue persists.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2020 Fiat 124 Spider<\/h2>\n<p>The following table lists the internal trouble codes that can be generated by the PCM in the 2020 Fiat 124 Spider. These codes help diagnose specific faults within the module\u2019s operation.<\/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-p0601-internal-control-module-memory-checksum-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0601<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Internal memory checksum error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\" style=\"color:#0563C1\"><b><u>Full P0601 guide &rarr;<\/u><\/b><\/a><\/td>\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>Factory Service Bulletins Worth Knowing<\/h2>\n<p>No factory service bulletins are documented for the 2020 Fiat 124 Spider PCM replacement or programming.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Protecting the PCM in Your 2020 Fiat 124 Spider<\/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\u2019s charging system clean and within spec to prevent voltage spikes that could damage the PCM.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Inspect and clean all electrical connectors and grounds associated with the PCM regularly.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump\u2011starting the vehicle with a charger that applies too much voltage, which can harm the module.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any diagnostic codes promptly to prevent further degradation of the PCM\u2019s functionality.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure the air cleaner assembly remains sealed and free of debris to avoid sensor interference.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2020-fiat-124-spider-1-4l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2020 Fiat 124 Spider<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/fiat-pcm-ecm-ecu-engine-computer.html\">Fiat 124 Spider module lineup<\/a> covers other engine configurations as well.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Final Thoughts<\/h2>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>If your 2020 Fiat 124 Spider stalls or shows P0601, learn how to safely replace the PCM and avoid costly repairs.<\/p>\n","protected":false},"author":1,"featured_media":521905,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[258,1300],"tags":[1302,676,1301],"class_list":["post-525085","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-car","category-fiat","tag-124-spider","tag-676","tag-fiat"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2020 Fiat 124 Spider PCM Relearn &amp; Reset 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\/2020-fiat-124-spider-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 Fiat 124 Spider PCM Relearn &amp; Reset Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"If your 2020 Fiat 124 Spider stalls or shows P0601, learn how to safely replace the PCM and avoid costly repairs.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fs1inc.com\/blog\/2020-fiat-124-spider-pcm-replacement-guide\/\" \/>\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=\"2026-07-17T12:40:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-19T15:36:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2026\/07\/2020-fiat-124-spider-ecm-location-card-1.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\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\\\/2020-fiat-124-spider-pcm-replacement-guide\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/2020-fiat-124-spider-pcm-replacement-guide\\\/\"},\"author\":{\"name\":\"FlagshipOne\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\"},\"headline\":\"2020 Fiat 124 Spider PCM Relearn &#038; 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