{"id":529238,"date":"2026-07-18T21:12:46","date_gmt":"2026-07-19T01:12:46","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=529238"},"modified":"2026-07-19T12:33:21","modified_gmt":"2026-07-19T16:33:21","slug":"2006-saturn-relay-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2006-saturn-relay-pcm-replacement-guide\/","title":{"rendered":"2006 Saturn Relay PCM ECM Engine Control Module Replacement Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2006 Saturn Relay PCM ECM Engine Control Module Replacement Guide<\/h1>\n<p class=\"hero-subtitle\">The powertrain control module in your 2006 Saturn Relay manages fuel delivery, ignition timing, and emissions functions. When this computer fails, you may encounter stalling, no-start conditions, or persistent diagnostic trouble codes. The module also coordinates with the transmission control module for proper shift operation.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>The PCM in your 2006 Saturn Relay sits beside the air cleaner assembly for relatively straightforward access<\/li>\n<li>Published labor time lists 0.9 hours for removal and replacement, plus 0.5 hours for the relearn procedure<\/li>\n<li>Factory procedure requires capturing module data with a scan tool before removal so it can be restored into the new unit<\/li>\n<li>Service bulletins document EGR-related codes P1404 and P0404 that may require PCM reprogramming<\/li>\n<li>Multiple module-internal codes from P0601 through P0641 and P1621 are documented for this vehicle<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>When your 2006 Saturn Relay develops drivability problems that resist conventional repairs, the engine computer may be a contributing factor. The powertrain control module, sometimes referred to as the engine control module in service literature, governs critical engine and transmission functions for the 3.9L V6 powerplant. Understanding how this component works, where it lives in your vehicle, and what happens when it fails can help you make informed repair decisions. This guide walks through the role of the PCM in your Saturn Relay, its physical location, and what the factory service manual says about replacement. You will also find information about programming requirements, common symptoms of module failure, documented trouble codes, and relevant service bulletins. The goal is to give you a clear picture of what replacing this computer involves so you can approach the repair with confidence and avoid unnecessary parts swaps. Whether you are diagnosing a persistent check engine light or planning a module replacement, the details cover the essentials for your specific vehicle and its powertrain.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2006 Saturn Relay<\/h2>\n<p>The powertrain control module in your 2006 Saturn Relay serves as the central brain for engine management and powertrain coordination. It continuously processes inputs from dozens of sensors monitoring airflow, coolant temperature, throttle position, oxygen content, and crankshaft position. Using that data, it commands fuel injector pulse width, ignition timing advance, and idle air control to keep the 3.9L V6 running efficiently across all operating conditions. Beyond engine management, the PCM also communicates with the transmission control module to regulate shift points and torque converter lockup. This integration ensures smooth gear transitions and optimal fuel economy. The module also oversees evaporative emissions testing, exhaust gas recirculation control, and various onboard diagnostics that illuminate the Service Engine Soon lamp when a fault is detected. Because the PCM handles so many interrelated functions, a failure can produce widely varying symptoms. Some failures affect only emissions monitoring, while others disrupt starting or fuel delivery entirely. Internal memory corruption, voltage damage from faulty charging components, or water intrusion through degraded connector seals can all compromise the module. When replacement becomes necessary, selecting <a href=\"https:\/\/www.fs1inc.com\/gm\/saturn-pcm-ecm-ecu-engine-computer\/relay-engine-computers.html\">replacement engine computers for the Relay<\/a> ensures the new unit matches your vehicle&#8217;s calibration and configuration. The module must be programmed with the correct software and calibration files for your specific powertrain combination, and certain learned values must be restored for the engine and transmission to perform as intended. Without proper programming, drivability problems may persist even after the new computer is installed.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>The factory service procedure indicates that the control module is accessed adjacent to the air cleaner assembly in your 2006 Saturn Relay. This placement keeps it relatively accessible compared to modules buried deep in the dashboard or under seats. Published labor times for this vehicle list 0.9 hours for removal and replacement of the powertrain control module. An additional 0.5 hours is allotted for the relearn procedure that follows installation. The same times apply if the component is referenced as the engine control module in service documentation: 0.9 hours for R&amp;R and 0.5 hours for relearn. These figures represent standard book times; actual service time may vary depending on shop conditions and technician familiarity with the vehicle. Before beginning removal, the factory procedure emphasizes capturing the existing module&#8217;s data with a scan tool. This saved information must be transferred into the replacement unit after it is installed. The physical removal itself involves disconnecting the electrical connector and releasing the module from its mounting location near the air cleaner housing.<\/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\/2006-saturn-relay-pcm-location-diagram.webp\" alt=\"2006 Saturn Relay PCM location diagram\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">PCM mounting location on the 2006 Saturn Relay.<\/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 2006 Saturn Relay<\/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 negative battery cable.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the left sheet metal diagonal brace.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Loosen<\/b> the air cleaner cover screws and remove the cover from the air cleaner.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the engine harness electrical connectors from the ECM.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> the ECM from the air cleaner cover.<\/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\">0.9 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\">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<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Programming Requirements After Replacement<\/h2>\n<p>After the replacement module is physically installed, the factory procedure requires specific programming steps. A scan tool must first capture data from the original module before removal, and that captured data then needs to be restored into the new unit. This includes learned adaptive values and configuration settings that help the engine and transmission operate correctly. In addition to data restoration, the factory notes that specialized equipment and the proper program and calibration files for the vehicle are required to reprogram the control module. This means a qualified technician with access to the appropriate scan tool and software is typically needed to complete the installation properly. When you source <a href=\"https:\/\/www.fs1inc.com\/2006-saturn-relay-3-9l-ecm-engine-computer-pcm-ecu-programmed-plug-play.html\">a VIN-programmed replacement unit<\/a> from Flagship One, the programming and calibration work is already completed before shipment. The unit arrives configured for your vehicle&#8217;s specific identification number, which eliminates the need for the scan-tool reprogramming and data restoration steps that the factory procedure describes. Your installer can focus on the physical swap and any relearn procedure the vehicle requires.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>Common symptoms of a failing powertrain control module in the 2006 Saturn Relay can range from subtle to severe. One of the most frequent indicators is a Service Engine Soon lamp that illuminates and remains on, sometimes accompanied by multiple diagnostic trouble codes that seem unrelated or return after repairs. Drivers may notice intermittent stalling, particularly at idle or during deceleration, or a no-start condition where the engine cranks but fails to fire. Misfire codes, rough running, and poor fuel economy can also surface when the module&#8217;s internal processing is compromised. In some cases, the vehicle may exhibit shifting irregularities or harsh gear changes if the PCM&#8217;s communication with the transmission control module is disrupted. Another telltale sign is loss of communication with a scan tool. If your technician connects a diagnostic scanner and cannot establish a link to the powertrain control module, the computer itself may have failed internally. Voltage irregularities from a weak alternator or a failing battery can damage the module over time, producing intermittent symptoms that worsen gradually. Among the documented module-internal codes for this vehicle, a code such as <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\">P0601 control module memory<\/a> indicates an internal checksum error, meaning the computer&#8217;s memory has become corrupted and the module typically requires replacement. Other codes in the P0600 series point to various internal processor, memory, or voltage reference faults that generally cannot be repaired without replacing the unit.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2006 Saturn Relay<\/h2>\n<p>The following diagnostic trouble codes are documented as module-internal faults for the 2006 Saturn Relay. These codes typically indicate problems within the powertrain control module itself rather than failures of external sensors or actuators. When any of these codes appear, a thorough diagnosis is essential before condemning the computer.<\/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>P060D<\/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<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-p0651-sensor-reference-voltage-b-circuitopen\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0651<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0651-sensor-reference-voltage-b-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-p0651-sensor-reference-voltage-b-circuitopen\/\" style=\"color:#0563C1\"><b><u>Full P0651 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-p1621-control-module-long-term-memory-performance\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P1621<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p1621-control-module-long-term-memory-performance\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Control module long-term memory performance<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p1621-control-module-long-term-memory-performance\/\" style=\"color:#0563C1\"><b><u>Full P1621 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>Two factory service bulletins are relevant to the 2006 Saturn Relay&#8217;s powertrain control module. Bulletin 06-06-04-003, later revised as 06-06-04-003D and dated March 20, 2007, addresses a Service Engine Soon lamp illumination accompanied by diagnostic trouble codes P1404 and P0404. The bulletin indicates that some vehicles may have previously been serviced for this same condition, and technicians may find that earlier exhaust gas recirculation valve and PCM replacements were performed. The recommended correction involves installing an EGR valve kit and reprogramming the PCM. Bulletin 05-06-04-060, dated September 23, 2005, covers diagnostic trouble codes P0601, P0602, P0603, P0604, and P1621 that are shared across multiple modules including the PCM, ECM, and TCM. These codes point to internal control module faults that may require module replacement rather than external component repair.<\/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>06-06-04-003<\/b><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Service Engine Soon (SES) Light Illuminated, Multiple Powertrain Control Module (PCM) Diagnosti<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Some customers may comment on a Service Engine Soon (SES) light illuminated on the instrument cluster. Some vehicles may have previously been serviced for this\u2026<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><b>05-06-04-060<\/b><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module (PCM), Engine Control Module (ECM), Transmission Control Module (ECM)<\/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 2006 Saturn Relay<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Maintain your charging system in good condition; a failing alternator can send voltage spikes that damage the PCM<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Keep battery terminals clean and tight to prevent voltage fluctuations that stress the module<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump-starting other vehicles from your Saturn Relay, as current surges may harm sensitive electronics<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Inspect the PCM connector for corrosion or damaged seals during routine maintenance<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address diagnostic trouble codes promptly rather than driving with an illuminated Service Engine Soon lamp<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure any aftermarket electrical accessories are connected directly to the battery, as the factory manual recommends<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>How long does it take to replace the PCM in a 2006 Saturn Relay?<\/h3>\n<p>The published labor time is 0.9 hours for removal and replacement of the powertrain control module, plus an additional 0.5 hours for the relearn procedure. Actual time may vary depending on the technician and shop conditions.<\/p>\n<h3>Where is the PCM located in my 2006 Saturn Relay?<\/h3>\n<p>The factory service procedure indicates the control module is accessed adjacent to the air cleaner assembly. This location is relatively straightforward to reach compared to modules in other vehicles.<\/p>\n<h3>Do I need to program the replacement PCM after installation?<\/h3>\n<p>The factory procedure requires capturing data from the original module with a scan tool before removal and restoring it into the new unit. Specialized equipment and the correct calibration files are also required for reprogramming. A VIN-programmed unit from Flagship One arrives with this work already completed.<\/p>\n<h3>What trouble codes indicate the PCM itself has failed in my Saturn Relay?<\/h3>\n<p>Codes in the P0600 series, including P0601 through P0604 and P062F, typically point to internal module faults. Code P1621 is also documented as a shared module-internal code for this vehicle. A proper diagnosis is recommended before replacing the computer.<\/p>\n<h3>Can a bad EGR valve affect the PCM in my 2006 Saturn Relay?<\/h3>\n<p>A factory service bulletin documents that EGR-related codes P1404 and P0404 may lead to repeated PCM replacements if the underlying EGR issue is not resolved. The recommended fix involves installing an EGR valve kit and reprogramming the PCM rather than replacing the computer alone.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2006 Saturn Relay is showing signs of PCM failure, you have two main paths: have the existing unit repaired or purchase a replacement. Repairing a failed module is sometimes possible, but internal memory faults and voltage damage often make replacement the more reliable option. A VIN-programmed unit eliminates the programming steps that the factory procedure requires, simplifying installation for your technician. The 3.9L powertrain depends on a correctly calibrated computer, so choosing a properly programmed module is essential for restoring normal drivability.<\/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\/gmtypeE67\/gm-pcm-typeE67-1.jpg\" alt=\"Refurbished VIN-programmed PCM for the 2006 Saturn Relay\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">A refurbished, VIN-programmed replacement PCM for the 2006 Saturn Relay from Flagship One.<\/figcaption><\/figure>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2006-saturn-relay-3-9l-ecm-engine-computer-pcm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2006 Saturn Relay<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/gm\/saturn-pcm-ecm-ecu-engine-computer\/relay-engine-computers.html\">Saturn Relay 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 2006 Saturn Relay plays a central role in engine performance, emissions control, and transmission operation. When symptoms point to module failure, understanding the location, labor times, and programming requirements helps you plan the repair with confidence. A VIN-programmed replacement from Flagship One can streamline the process by eliminating factory reprogramming steps. Explore the available options for your Saturn Relay to get back on the road with a properly functioning engine computer.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Experiencing no-start or stalling in your 2006 Saturn Relay? PCM\/ECM failure may cause driveability issues. Learn symptoms, programming, and replacement steps.<\/p>\n","protected":false},"author":1,"featured_media":520781,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[258,471],"tags":[393,513,73],"class_list":["post-529238","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-car","category-saturn","tag-393","tag-relay","tag-saturn"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2006 Saturn Relay PCM ECM Engine Control Module Replacement 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\/2006-saturn-relay-pcm-replacement-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2006 Saturn Relay PCM ECM Engine Control Module Replacement Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Experiencing no-start or stalling in your 2006 Saturn Relay? 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