{"id":524869,"date":"2026-07-16T02:41:59","date_gmt":"2026-07-16T06:41:59","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=524869"},"modified":"2026-07-16T02:41:59","modified_gmt":"2026-07-16T06:41:59","slug":"2020-chevrolet-silverado-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2020-chevrolet-silverado-pcm-replacement-guide\/","title":{"rendered":"2020 Chevrolet Silverado Powertrain and Engine Control Module Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2020 Chevrolet Silverado Powertrain and Engine Control Module Guide<\/h1>\n<p class=\"hero-subtitle\">In the 2020 Chevrolet Silverado, the powertrain and engine control modules manage engine timing, fuel delivery, and transmission shift logic. Failure of either module may trigger multiple diagnostic codes, cause loss of power, or illuminate the malfunction indicator lamp.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>Powertrain Control Module removal and install typically requires 1.2\u202fhours of labor.<\/li>\n<li>Engine Control Module removal and install also typically requires 1.2\u202fhours of labor.<\/li>\n<li>Relearn procedures for both modules generally add 0.5\u202fhours each after installation.<\/li>\n<li>A reset for the Engine Control Module may take an additional 0.3\u202fhours.<\/li>\n<li>Always turn the ignition off before disconnecting ECM connectors to avoid damage.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>When a 2020 Chevrolet Silverado experiences persistent warning lights or diagnostic trouble codes, the underlying issue often involves the powertrain or engine control modules. Understanding how these computers operate, the steps required for safe removal, and the factory\u2011required programming helps you avoid unnecessary downtime. This guide explains the function of each module, outlines the labor involved, and clarifies the programming steps so you can make an informed decision about repair or replacement.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2020 Chevrolet Silverado<\/h2>\n<p>The Powertrain Control Module in the 2020 Chevrolet Silverado oversees transmission shift timing, torque converter lock\u2011up, and overall power delivery, while the Engine Control Module controls fuel injection, ignition timing, and emissions monitoring. Both modules communicate with sensors and actuators to keep the vehicle running smoothly. Proper operation is essential for performance, fuel efficiency, and emissions compliance. When a failure occurs, you may see a range of symptoms, and the vehicle may enter a limp mode. Access to reliable <a href=\"https:\/\/www.fs1inc.com\/gm-general-motors\/chevrolet-pcm-ecm-ecu-engine-computer\/silverado-engine-computers.html\">replacement engine computers for the Silverado<\/a> ensures that the vehicle can be restored to factory specifications.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>Both the Powertrain Control Module and the Engine Control Module are mounted within the engine compartment, typically secured to the vehicle&#8217;s firewall or a dedicated bracket. Removing either unit involves disconnecting the ECM connectors with the ignition turned off, as mandated by the factory caution. The labor estimate for removing and reinstalling each module is 1.2\u202fhours, and the subsequent relearn process adds 0.5\u202fhours. For the Engine Control Module, an additional reset step may require 0.3\u202fhours. No torque specifications are provided in the source data.<\/p>\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 Chevrolet Silverado<\/h3>\n<ol style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> any debris from around the control module connector.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the battery negative cable.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the left front tire and wheel assembly.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the 3 engine control module electrical connectors.<\/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\">1.2 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 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\">1.2 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<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Programming Requirements After Replacement<\/h2>\n<p>After installing a new module in the 2020 Chevrolet Silverado, the factory procedure calls for disconnecting and reconnecting the battery negative cable to initiate reprogramming of the replacement unit. Flagship One supplies a <a href=\"https:\/\/www.fs1inc.com\/2020-chevrolet-silverado-1500-2-7l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">a VIN-programmed replacement unit<\/a> that arrives pre\u2011configured, so the battery\u2011cable step is already satisfied and the vehicle can be returned to service without additional programming.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>Common signs of a failing powertrain or engine control module in a 2020 Chevrolet Silverado include a persistent check engine light, rough idle, loss of power during acceleration, and occasional transmission shifting irregularities. Diagnostic scans often reveal codes such as <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\">P0601 sensor circuit malfunction<\/a>, indicating internal communication issues within the module. In some cases, the vehicle may refuse to start or exhibit intermittent stalling.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2020 Chevrolet Silverado<\/h2>\n<p>The following diagnostic trouble codes are documented for the 2020 Chevrolet Silverado&#8217;s control modules:<\/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-p0602-control-module-programming-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0602<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0602-control-module-programming-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Control module programming error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0602-control-module-programming-error\/\" style=\"color:#0563C1\"><b><u>Full P0602 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-p0603-internal-control-module-keep-alive-memory-kam-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0603<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0603-internal-control-module-keep-alive-memory-kam-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Keep-alive memory (KAM) error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0603-internal-control-module-keep-alive-memory-kam-error\/\" style=\"color:#0563C1\"><b><u>Full P0603 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-p0604-internal-control-module-random-access-memory-ram-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0604<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0604-internal-control-module-random-access-memory-ram-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Internal RAM error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0604-internal-control-module-random-access-memory-ram-error\/\" style=\"color:#0563C1\"><b><u>Full P0604 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<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0607-control-module-performance\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0607<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0607-control-module-performance\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module performance fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0607-control-module-performance\/\" style=\"color:#0563C1\"><b><u>Full P0607 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><b>P060A<\/b><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Module-internal fault<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">&mdash;<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p062f-internal-control-module-eeprom-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P062F<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p062f-internal-control-module-eeprom-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Internal EEPROM error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p062f-internal-control-module-eeprom-error\/\" style=\"color:#0563C1\"><b><u>Full P062F 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>Service Bulletin #20-NA-100, dated June 24, 2020, addresses a calibration procedure for the Engine Control Module on certain T1 L3B engines when DTC P26BB is set, often reported as an illuminated MIL light. Bulletin #20-NA-090, dated January 24, 2022, provides guidance on identifying non\u2011GM ECM calibration use and power\u2011up hardware detection in Duramax diesel engines using GDS 2.<\/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\">Bulletin<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Subject<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">What It Addresses<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">&mdash;<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Bulletins &gt; Engine\/Propulsion &gt; #20-NA-100: Engine Control Module Calibration for T1 L3B Engine<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Some customers may comment that the MIL light is illuminated. A technician may find DTC P26BB set current or<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">&mdash;<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Bulletins &gt; Engine\/Propulsion &gt; #20-NA-090: Identifying Non-GM ECM Calibration Use and Power-up<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">&mdash;<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Protecting the PCM in Your 2020 Chevrolet Silverado<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Maintain a healthy charging system to ensure stable voltage supply.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Keep connector pins and grounds clean and free of corrosion.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump\u2011start voltage spikes that can damage electronic modules.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any diagnostic codes promptly before they recur.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure connector seals remain intact to protect against moisture.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>What are the labor times for replacing the Powertrain Control Module on a 2020 Chevrolet Silverado?<\/h3>\n<p>The factory book time for removing and installing the Powertrain Control Module is typically 1.2\u202fhours, with an additional 0.5\u202fhours for the relearn procedure.<\/p>\n<h3>Do I need to perform a battery disconnect after installing a new Engine Control Module in a 2020 Silverado?<\/h3>\n<p>Yes, the factory procedure requires disconnecting and reconnecting the battery negative cable to reprogram the replacement module, though a VIN\u2011programmed unit from Flagship One may already include this step.<\/p>\n<h3>Which service bulletins relate to Engine Control Module issues on the 2020 Silverado?<\/h3>\n<p>Bulletins #20-NA-100 and #20-NA-090 cover calibration and non\u2011GM ECM detection procedures relevant to this vehicle.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>When the control module in your 2020 Chevrolet Silverado needs attention, you can choose a factory\u2011direct repair or consider a refurbished replacement that meets original specifications. Both options aim to restore proper engine and transmission management, while a Flagship One unit offers the advantage of pre\u2011programmed VIN alignment to streamline the reinstallation process.<\/p>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2020-chevrolet-silverado-1500-2-7l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2020 Chevrolet Silverado<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/gm-general-motors\/chevrolet-pcm-ecm-ecu-engine-computer\/silverado-engine-computers.html\">Chevrolet Silverado 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 Chevrolet Silverado relies on its powertrain and engine control modules for reliable performance. Whether you opt for a repair or a Flagship One replacement, ensuring proper installation and programming will help keep the vehicle running as intended. Contact a qualified technician to evaluate the best path forward.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>If your 2020 Chevrolet Silverado shows a MIL light or related codes, remember to turn the ignition off when handling ECM connectors; proper replacement and relearn can restore performance.<\/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":[258,274],"tags":[676,67,1226],"class_list":["post-524869","post","type-post","status-publish","format-standard","hentry","category-car","category-chevrolet","tag-676","tag-chevrolet","tag-silverado"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2020 Chevrolet Silverado Powertrain and Engine Control Module 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-chevrolet-silverado-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 Chevrolet Silverado Powertrain and Engine Control Module Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"If your 2020 Chevrolet Silverado shows a MIL light or related codes, remember to turn the ignition off when handling ECM connectors; 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