{"id":523347,"date":"2026-07-15T21:34:57","date_gmt":"2026-07-16T01:34:57","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=523347"},"modified":"2026-07-19T10:32:43","modified_gmt":"2026-07-19T14:32:43","slug":"1997-buick-century-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/1997-buick-century-pcm-replacement-guide\/","title":{"rendered":"1997 Buick Century PCM Replacement &#038; Relearn Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>1997 Buick Century PCM Replacement &amp; Relearn Guide<\/h1>\n<p class=\"hero-subtitle\">The Powertrain Control Module in the 1997 Buick Century manages engine timing, fuel delivery, and emission control. A fault can lead to poor performance, misfires, or a failed start, as the PCM cannot properly communicate with engine sensors.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>PCM replacement takes roughly 0.5 to 0.9 hours per module.<\/li>\n<li>The module sits under the hood, front of the right strut tower.<\/li>\n<li>Removing or installing requires turning the ignition off to avoid damage.<\/li>\n<li>After replacement the PCM must relearn the engine oil life and theft deterrent password if BCM was swapped.<\/li>\n<li>Flagship One units arrive VIN\u2011programmed, eliminating relearn steps.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>When a 1997 Buick Century fails to start, stalls, or displays fault codes, the Powertrain Control Module is often the culprit. This guide walks you through locating the PCM, safely removing and installing a replacement, and understanding the factory programming requirements. By following these steps you can restore reliable engine performance and avoid costly errors. Whether you\u2019re a DIY mechanic or a service technician, the information here is designed to give you confidence in handling the PCM on this specific model.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 1997 Buick Century<\/h2>\n<p>The PCM in a 1997 Buick Century is the central brain that interprets data from the engine sensors and controls fuel injection, ignition timing, and emission systems. When the PCM malfunctions, the vehicle may exhibit symptoms such as hard starts, stalling, or a high idle. <a href=\"https:\/\/www.fs1inc.com\/gm\/buick-pcm-ecm-ecu-engine-computer\/century-engine-computers.html\">1997 Buick Century PCM replacement<\/a> The module\u2019s health directly affects how the engine responds to throttle inputs and maintains smooth operation. A failing PCM can also cause the engine control system to default to a safe mode, limiting performance until the fault is addressed. Regular checks and timely replacements keep the vehicle running efficiently and prevent more severe damage to the engine or drivetrain.<\/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 under the hood, in front of the right strut tower near the engine coolant reservoir. Removing or installing the unit requires opening the hood, disconnecting the battery cable, and carefully removing the PCM connectors. The labor book time for relearn is 0.5 hours and for a full replacement is 0.9 hours per module. During replacement you must ensure that all power sources are disconnected and that the connectors are handled with care to avoid static damage.<\/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\/1997-buick-century-pcm-location-card-1.webp\" alt=\"1997 Buick Century PCM location diagram\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">Typical PCM mounting area on the 1997 Buick Century (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 1997 Buick Century<\/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> the negative battery cable.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the left strut brace.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the air cleaner housing cover and the PCM from the.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the harness connectors from PCM.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the PCM from the engine compartment.<\/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\">One<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.9 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\">0.9 hr<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Programming Requirements After Replacement<\/h2>\n<p>After a new PCM is installed, the vehicle must relearn the remaining engine oil life and, if the BCM was replaced, the theft deterrent password. Flagship One units arrive VIN\u2011programmed, so those steps are already completed. <a href=\"https:\/\/www.fs1inc.com\/1997-buick-century-3-1l-ecm-engine-computer-pcm-ecu-programmed-plug-play.html\">VIN\u2011programmed replacement unit<\/a> This eliminates the need for manual relearn procedures and reduces labor time. The factory caution is to turn the ignition off when handling the PCM connectors to prevent internal damage.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>Common indicators that the PCM is failing in a 1997 Buick Century include a hard start, engine stalling under load, or a sudden loss of power. The vehicle may also display generic trouble codes such as <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\">P0601<\/a>, which signals a memory integrity issue within the PCM. If you notice any of these symptoms, inspecting the PCM should be a priority.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 1997 Buick Century<\/h2>\n<p>The following list details the internal trouble codes that can be generated by the PCM in a 1997 Buick Century. These codes help pinpoint specific PCM faults and guide troubleshooting efforts.<\/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\"><b>P1626<\/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\"><b>P1629<\/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\"><b>P1635<\/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\"><b>P1639<\/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\"><b>P1641<\/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\"><b>P1651<\/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\"><b>P1652<\/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\"><b>P1654<\/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\"><b>P1655<\/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\"><b>P1662<\/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<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Factory Service Bulletins Worth Knowing<\/h2>\n<p>The factory service bulletin #99-06-04-053, dated Oct 26, 1999, provides information on PCM reprogramming procedures for this model.<\/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\"><b>99-06-04-053<\/b><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Info &#8211; PCM Reprogramming &#8211; (Oct 26, 1999)<\/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 1997 Buick Century<\/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\">Ensure all connector grounds are clean and free of corrosion.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump\u2011starting the vehicle without disconnecting the battery first.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any fault codes promptly to prevent further PCM damage.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Maintain the integrity of connector seals to prevent moisture ingress.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>What happens if the PCM is replaced but not relearned on a 1997 Buick Century?<\/h3>\n<p>If the PCM is swapped without relearning the engine oil life or theft deterrent password, the vehicle may default the oil life to 100% and the engine may not recognize the theft system, potentially leading to security alerts or reduced performance.<\/p>\n<h3>Can a 1997 Buick Century use a generic PCM replacement?<\/h3>\n<p>A generic PCM may not have the correct VIN or factory programming for this specific model, which could result in incorrect sensor data interpretation or failure to meet emission standards.<\/p>\n<h3>Is it safe to replace the PCM while the engine is running?<\/h3>\n<p>No. The factory caution explicitly states that the ignition must be off when installing or removing the PCM connectors to avoid internal damage from static discharge or power surges.<\/p>\n<h3>How long does the relearn process take after a PCM replacement?<\/h3>\n<p>The relearn procedure is listed as 0.5 hours in the labor book, but the actual time can vary depending on the vehicle\u2019s readiness and any additional programming required.<\/p>\n<h3>What codes should I check for after a PCM replacement?<\/h3>\n<p>After replacement, scan for codes like P0601, P0602, P1626, and others listed in the internal trouble code table to ensure the PCM is functioning correctly.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>Whether you choose to repair your existing PCM or opt for a refurbished replacement, understanding the 1997 Buick Century\u2019s PCM requirements ensures a smooth process. A well\u2011installed and properly programmed module will restore reliable performance and protect your vehicle\u2019s engine control system.<\/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\/gmtypeP\/gm-pcm-typeP-large1.jpg\" alt=\"Refurbished VIN-programmed PCM for the 1997 Buick Century\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">A refurbished, VIN-programmed replacement PCM for the 1997 Buick Century from Flagship One.<\/figcaption><\/figure>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/1997-buick-century-3-1l-ecm-engine-computer-pcm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 1997 Buick Century<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/gm\/buick-pcm-ecm-ecu-engine-computer\/century-engine-computers.html\">Buick Century module lineup<\/a> covers other engine configurations as well.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Final Thoughts<\/h2>\n<p>By addressing PCM issues promptly on your 1997 Buick Century, you safeguard engine performance and prevent costly repairs down the line. Consider a Flagship One replacement for a seamless, factory\u2011ready solution.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>If your 1997 Buick Century stalls or shows error codes, a PCM issue may be the cause. Learn how to replace the module safely and avoid damage.<\/p>\n","protected":false},"author":1,"featured_media":521656,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[359,258],"tags":[78,65,360],"class_list":["post-523347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-buick","category-car","tag-78","tag-buick","tag-century"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>1997 Buick Century PCM Replacement &amp; 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\/1997-buick-century-pcm-replacement-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1997 Buick Century PCM Replacement &amp; Relearn Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"If your 1997 Buick Century stalls or shows error codes, a PCM issue may be the cause. 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