{"id":523407,"date":"2026-07-15T20:01:47","date_gmt":"2026-07-16T00:01:47","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=523407"},"modified":"2026-07-19T10:35:23","modified_gmt":"2026-07-19T14:35:23","slug":"2004-buick-century-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2004-buick-century-pcm-replacement-guide\/","title":{"rendered":"2004 Buick Century PCM Replacement: What Owners Should Know"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2004 Buick Century PCM Replacement: What Owners Should Know<\/h1>\n<p class=\"hero-subtitle\">The Powertrain Control Module (PCM) in the 2004 Buick Century manages engine and transmission functions. Failures may cause erratic performance, stored internal codes, or complete drivability loss. Replacement requires careful handling to prevent electrostatic damage and proper programming to retain vehicle settings.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>Factory labor for PCM removal and reinstallation is typically 0.9 hours.<\/li>\n<li>A relearn procedure adds another 0.5 hours after replacement.<\/li>\n<li>The module is located near the air cleaner assembly for easier access.<\/li>\n<li>Electrostatic discharge precautions are critical during handling.<\/li>\n<li>Programming must include the remaining engine oil life to avoid a 100% reset.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2004 Buick Century has been running poorly\u2014stalling, refusing to start, or throwing cryptic engine codes\u2014you might be dealing with a failing Powertrain Control Module (PCM). This small but critical computer oversees everything from fuel delivery to transmission shifts, and when it malfunctions, the symptoms can range from subtle to severe. Replacing it isn\u2019t as simple as swapping a fuse; the process involves careful handling to avoid damage, precise installation steps, and programming to ensure the vehicle retains its settings. Understanding what\u2019s involved can help you avoid unexpected costs or repeat repairs. Whether you\u2019re preparing for a shop visit or considering a DIY approach, knowing the factory procedures and potential pitfalls will give you confidence in addressing the issue correctly.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2004 Buick Century<\/h2>\n<p>The Powertrain Control Module in your 2004 Buick Century acts as the brain for both the engine and transmission. It continuously monitors sensors to adjust fuel injection, ignition timing, and shift points, ensuring smooth operation and optimal fuel efficiency. When this module fails, the vehicle may experience a range of issues, from rough idling to complete failure to start. Because it integrates so many functions, a malfunctioning PCM can trigger multiple warning lights or even leave you stranded. Replacement isn\u2019t just about plugging in a new unit; it requires careful handling to avoid damaging sensitive electronics. For those needing a reliable fix, <a href=\"https:\/\/www.fs1inc.com\/gm\/buick-pcm-ecm-ecu-engine-computer\/century-engine-computers.html\">replacement engine computers for the Buick Century<\/a> are designed to restore full functionality while meeting factory specifications. Without proper programming, however, even a new module won\u2019t perform as intended, which is why following the correct procedures is essential.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>In the 2004 Buick Century, the PCM is positioned next to the air cleaner assembly, making it relatively accessible compared to some vehicles where the module is buried under the dashboard or behind the engine. To replace it, you\u2019ll need to disconnect the battery and carefully remove the air cleaner housing to reach the module. The factory procedure specifies handling the unit by its edges to avoid touching the connector pins or circuit board, as electrostatic discharge can cause internal damage. Once removed, the new module is installed in the reverse order, with connectors secured and the air cleaner assembly reinstalled. Labor time for removal and reinstallation is typically 0.9 hours, according to factory estimates. After physical installation, a relearn procedure is required, which adds another 0.5 hours to ensure the vehicle\u2019s systems recognize the new module.<\/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\/2004-buick-century-ecm-location-card-1.webp\" alt=\"2004 Buick Century PCM location diagram\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">Typical PCM mounting area on the 2004 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 2004 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 air cleaner housing cover assembly.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the PCM connectors and remove the PCM from the.<\/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 installing a new PCM in your 2004 Buick Century, the factory procedure requires a relearn process to synchronize the module with the vehicle\u2019s systems. This step is critical because the PCM must recalibrate to the engine\u2019s sensors and transmission controls. Additionally, the remaining engine oil life must be reprogrammed into the new module; if this isn\u2019t done, the system defaults to 100%, which could lead to premature or delayed oil change reminders. The relearn process typically takes 0.5 hours and involves using a scan tool to reset adaptive values. However, if you opt for <a href=\"https:\/\/www.fs1inc.com\/2004-buick-century-3-1l-engine-computer-pcm-ecm-ecu-programmed-plug-play.html\">a VIN-programmed replacement unit<\/a>, these steps are already completed, saving you time and ensuring the module arrives ready to install. This eliminates the need for additional programming at the shop, reducing the risk of errors during the setup process.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>A failing PCM in the 2004 Buick Century often announces itself through a variety of symptoms, some of which can mimic other issues. Common signs include intermittent stalling, especially at idle or during deceleration, as the module struggles to maintain proper fuel and spark delivery. You might also notice the engine cranking but not starting, or it may start and then die shortly after. Transmission shifting may become erratic, with harsh or delayed gear changes. Onboard diagnostics may reveal internal module codes like <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\">an internal control module memory checksum error<\/a>, which indicates corruption in the PCM\u2019s memory. Other symptoms include poor fuel economy, rough idling, or even a complete loss of communication with a scan tool. Because these issues can overlap with sensor or wiring problems, proper diagnosis is key to avoiding unnecessary repairs.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2004 Buick Century<\/h2>\n<p>The 2004 Buick Century\u2019s PCM can generate a range of internal trouble codes when it malfunctions. These codes typically point to issues within the module itself rather than external sensors or wiring. The list below includes the most common codes associated with PCM failures in this vehicle.<\/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-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0605<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Internal ROM error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#0563C1\"><b><u>Full P0605 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\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0620-generator-control-circuit\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0620<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0620-generator-control-circuit\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module-internal fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0620-generator-control-circuit\/\" style=\"color:#0563C1\"><b><u>Full P0620 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-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<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0641-sensor-reference-voltage-circuitopen\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0641<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0641-sensor-reference-voltage-circuitopen\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module-internal fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0641-sensor-reference-voltage-circuitopen\/\" style=\"color:#0563C1\"><b><u>Full P0641 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-p0645-ac-clutch-relay-control-circuit\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0645<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0645-ac-clutch-relay-control-circuit\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module-internal fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0645-ac-clutch-relay-control-circuit\/\" style=\"color:#0563C1\"><b><u>Full P0645 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-p0650-mil-control-circuitopen\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0650<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0650-mil-control-circuitopen\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module-internal fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0650-mil-control-circuitopen\/\" style=\"color:#0563C1\"><b><u>Full P0650 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Protecting the PCM in Your 2004 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 your vehicle\u2019s 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 battery connections are clean and tight, as poor grounding can cause electrical issues.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump-starting the vehicle with improper voltage, as this may harm sensitive electronics.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any stored trouble codes promptly to prevent cascading failures in the PCM or other systems.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Inspect the PCM connector regularly for corrosion or bent pins, as poor connections can cause intermittent issues.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Handle the PCM by its edges when removing or installing it to prevent electrostatic discharge damage.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>Can I replace the PCM in my 2004 Buick Century myself?<\/h3>\n<p>Replacing the PCM is physically straightforward, as it\u2019s located near the air cleaner assembly. However, the process requires careful handling to avoid electrostatic damage and proper programming afterward. If you\u2019re not comfortable with these steps, a professional installation is recommended.<\/p>\n<h3>Why does my 2004 Buick Century keep throwing code P0601?<\/h3>\n<p>Code P0601 indicates an internal memory checksum error in the PCM, often caused by corruption in the module\u2019s software or hardware failure. This may result from voltage spikes, age-related wear, or physical damage. Replacement is typically the most reliable solution.<\/p>\n<h3>What happens if I don\u2019t reprogram the oil life after replacing the PCM?<\/h3>\n<p>If the remaining engine oil life isn\u2019t reprogrammed into the new PCM, the system will default to 100%. This could lead to premature oil change reminders or, conversely, delayed alerts, potentially causing engine wear if oil changes are postponed.<\/p>\n<h3>How do I know if my 2004 Buick Century\u2019s PCM is failing or if it\u2019s a sensor issue?<\/h3>\n<p>A failing PCM often triggers multiple codes or symptoms that don\u2019t align with a single sensor failure. For example, you might see internal module codes like P0601 alongside drivability issues. A scan tool can help distinguish between PCM and sensor-related faults.<\/p>\n<h3>Is it safe to drive my 2004 Buick Century with a bad PCM?<\/h3>\n<p>Driving with a failing PCM can be unpredictable. The vehicle may stall, refuse to start, or exhibit erratic transmission behavior. If you suspect PCM issues, it\u2019s best to address them promptly to avoid being stranded or causing further damage.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2004 Buick Century is experiencing PCM-related issues, you have options for repair or replacement. While some shops may attempt to reflash the existing module, this isn\u2019t always a permanent fix, especially if the hardware is failing. A new or refurbished replacement unit can restore full functionality, but it\u2019s important to choose one that\u2019s pre-programmed to your vehicle\u2019s VIN to avoid additional setup steps. For those looking to avoid the hassle of programming, a ready-to-install module can save time and ensure a smooth repair process.<\/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\/gmtypeA\/gm-pcm-typea-1.jpg\" alt=\"Refurbished VIN-programmed PCM for the 2004 Buick Century\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">A refurbished, VIN-programmed replacement PCM for the 2004 Buick Century from Flagship One.<\/figcaption><\/figure>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2004-buick-century-3-1l-engine-computer-pcm-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2004 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>The 2004 Buick Century relies on its PCM to manage critical engine and transmission functions, and when this module fails, the symptoms can be frustrating and unpredictable. Understanding the replacement process, from handling precautions to programming requirements, can help you make informed decisions about repairs. Whether you opt for a DIY approach or professional installation, ensuring the new module is properly programmed will save you time and prevent future issues. Addressing PCM problems promptly will keep your Century running smoothly for miles to come.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>2004 Buick Century with stalling, no-start, or internal module codes like P0601 may need a PCM replacement. Learn factory procedures, labor times, and programming requirements to avoid oil-life reset issues.<\/p>\n","protected":false},"author":1,"featured_media":521684,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[359,258],"tags":[50,65,360],"class_list":["post-523407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-buick","category-car","tag-50","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>2004 Buick Century PCM Replacement: What Owners Should Know - 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\/2004-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=\"2004 Buick Century PCM Replacement: What Owners Should Know - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"2004 Buick Century with stalling, no-start, or internal module codes like P0601 may need a PCM replacement. 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