{"id":532698,"date":"2026-07-17T16:18:38","date_gmt":"2026-07-17T20:18:38","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=532698"},"modified":"2026-07-17T16:18:38","modified_gmt":"2026-07-17T20:18:38","slug":"1999-chrysler-lhs-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/1999-chrysler-lhs-pcm-replacement-guide\/","title":{"rendered":"1999 Chrysler LHS PCM\/ECM Relearn &#038; Replacement"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>1999 Chrysler LHS PCM\/ECM Relearn &amp; Replacement<\/h1>\n<p class=\"hero-subtitle\">The Powertrain Control Module and Engine Control Module in the 1999 Chrysler LHS manage fuel delivery, ignition timing, and transmission shifts. When they fail, the vehicle may exhibit stalling, poor acceleration, or misfire codes, disrupting drivability.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>PCM relearn takes 0.5 hours, R&amp;R 0.4 hours<\/li>\n<li>ECM relearn takes 0.5 hours, R&amp;R 0.4 hours<\/li>\n<li>Reprogramming requires the vehicle\u2019s VIN and mileage<\/li>\n<li>Speed control servo and bracket installed with fastener tightening<\/li>\n<li>Radio and clock are reprogrammed after battery reconnection<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>When your 1999 Chrysler LHS starts to misfire, stall, or lose power, the Powertrain Control Module or Engine Control Module could be the source. Understanding how these modules work, where they sit, and how to replace them can help you keep the vehicle running reliably. This guide explains the basics, shows the steps you\u2019ll need to take, and highlights how Flagship One\u2019s units simplify the process.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 1999 Chrysler LHS<\/h2>\n<p>The Powertrain Control Module in the 1999 Chrysler LHS directs the engine\u2019s fuel and ignition systems while coordinating transmission shifts. The Engine Control Module focuses on engine timing and sensor data. <a href=\"https:\/\/www.fs1inc.com\/chrysler-dodge-plymouth\/chrysler-pcm-ecm-ecu-engine-computer\/lhs-engine-computers.html\">replacement engine computers for the 1999 Chrysler LHS<\/a> ensures your vehicle\u2019s performance remains consistent. Both modules must communicate correctly with other vehicle systems; any disruption can trigger misfire codes, stalling, or a loss of power. Properly functioning modules keep the 1999 Chrysler LHS running smoothly and safely.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>The Powertrain Control Module is located behind the dashboard, accessible by removing the lower dash panel. Replacing it involves disconnecting the module\u2019s power and ground connectors, removing the mounting bolts, and installing the new unit. The Engine Control Module sits in the engine bay, attached to the firewall. To replace it, you must remove the engine bay cover, disconnect the wiring harness, and swap the old module for the new one. Both replacements require the book times of 0.5 hours for relearn and 0.4 hours for removal and reinstallation, as noted in the labor facts.<\/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\/1999-chrysler-lhs-pcm-service-figure.webp\" alt=\"1999 Chrysler LHS PCM location diagram\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">From the factory PCM removal procedure for the 1999 Chrysler LHS.<\/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 1999 Chrysler LHS<\/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> speed control servo and bracket and reposition out of the way ei.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> washer bottle filler neck.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> Transmission Control Module (TCM) reposition out of the way.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> PCM Disconnect PCM 2 40-way connector.<\/li>\n<\/ol>\n<p style='margin:10px 0 0 0'><em>Work with the ignition off, and treat the module as static-sensitive: avoid touching the connector pins at any point.<\/em><\/p>\n<\/div>\n<table style=\"width:100%;border-collapse:collapse;margin:18px 0;font-size:15px\">\n<tr>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Operation<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Configuration<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Book Time<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.4 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\">0.4 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 or ECM, the factory procedure calls for using the DRB scan tool to reprogram the unit with the vehicle\u2019s original VIN and mileage, then reconnecting the negative battery cable, and reprogramming the radio and clock. Flagship One units arrive VIN-programmed, so those steps are already completed. You only need to connect the new module and verify communication with the scan tool. <a href=\"https:\/\/www.fs1inc.com\/1999-chrysler-lhs-3-5l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">a VIN-programmed replacement unit<\/a> simplifies the process and reduces labor.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>Common symptoms of a failing PCM or ECM in the 1999 Chrysler LHS include stalling, misfires, poor acceleration, and erratic shifting. If the vehicle fails to start or displays a dead scan-tool communication, it may be due to a faulty module. <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\">Powertrain Control Module Failure<\/a> can be one of the diagnostic trouble codes triggered by these issues, indicating that the module\u2019s internal circuitry is not functioning correctly.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 1999 Chrysler LHS<\/h2>\n<p>The following internal trouble codes are documented for the 1999 Chrysler LHS PCM and ECM: P0600, P0601, P0622, P0645, P1682, P1683, P1685, P1686, P1687, P1695, P1696, P1697, P1698.<\/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-p0600-serial-communication-link\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0600<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0600-serial-communication-link\/\" 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-p0600-serial-communication-link\/\" style=\"color:#0563C1\"><b><u>Full P0600 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-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-p0622-generator-fieldf-terminal-circuit\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0622<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0622-generator-fieldf-terminal-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-p0622-generator-fieldf-terminal-circuit\/\" style=\"color:#0563C1\"><b><u>Full P0622 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-p1682-metering-oil-pump-malfunction\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P1682<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p1682-metering-oil-pump-malfunction\/\" 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-p1682-metering-oil-pump-malfunction\/\" style=\"color:#0563C1\"><b><u>Full P1682 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-p1683-control-module-fault\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P1683<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p1683-control-module-fault\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Control module fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p1683-control-module-fault\/\" style=\"color:#0563C1\"><b><u>Full P1683 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><b>P1685<\/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>P1686<\/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>P1687<\/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>P1695<\/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>P1696<\/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>P1697<\/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 #08-030-06 Rev. A addresses Powertrain Control Module Initialization for the 1999 Chrysler LHS. This bulletin provides guidance on correctly initializing the module during replacement or 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>08-030-06 Rev. A<\/b><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">08-030-06 Rev. A Powertrain Control Module Initialization<\/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 1999 Chrysler LHS<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Ensure the charging system remains healthy to prevent voltage spikes that can damage the PCM\/ECM<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Keep all connector grounds clean and secure to maintain reliable communication<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump\u2011starting the vehicle without proper precautions to prevent sudden voltage surges<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any diagnostic trouble codes promptly to avoid further module degradation<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Maintain connector seals to keep moisture and contaminants out of the module connections<\/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 1999 Chrysler LHS?<\/h3>\n<p>The labor book time for replacing the Powertrain Control Module in the 1999 Chrysler LHS is 0.4 hours, plus 0.5 hours for relearn if required. The total time depends on the shop\u2019s workflow and any additional diagnostics.<\/p>\n<h3>Do I need to reprogram the radio after installing a new ECM?<\/h3>\n<p>Yes, after installing a new Engine Control Module, the factory procedure requires reprogramming the radio and clock. Flagship One units are pre\u2011programmed, so the radio reprogramming step is not necessary when using our replacement.<\/p>\n<h3>What codes might appear if the PCM fails in a 1999 Chrysler LHS?<\/h3>\n<p>Common PCM failure codes include P0600, P0601, and P0622. These indicate internal module faults and typically require module replacement or relearn procedures.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>If you\u2019re experiencing performance issues with your 1999 Chrysler LHS, you can choose between a repair that involves relearning modules or a refurbished replacement that comes pre\u2011programmed. Both options restore reliable operation, but a refurbished unit saves time and reduces the risk of incomplete reprogramming.<\/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\/chryslertcgray\/chryslertc-pcm-grayplug-1.jpg\" alt=\"Refurbished VIN-programmed PCM for the 1999 Chrysler LHS\" loading=\"lazy\"\/><figcaption style=\"font-size:13px;color:#667085;margin-top:8px\">A refurbished, VIN-programmed replacement PCM for the 1999 Chrysler LHS from Flagship One.<\/figcaption><\/figure>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/1999-chrysler-lhs-3-5l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 1999 Chrysler LHS<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/chrysler-dodge-plymouth\/chrysler-pcm-ecm-ecu-engine-computer\/lhs-engine-computers.html\">Chrysler LHS module lineup<\/a> covers other engine configurations as well.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Final Thoughts<\/h2>\n<p>For the 1999 Chrysler LHS, a faulty Powertrain Control Module or Engine Control Module can lead to stalling, misfires, or shifting problems. By addressing these modules promptly, you can keep the vehicle operating smoothly. Consider a refurbished replacement for a hassle\u2011free solution.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>If your 1999 Chrysler LHS stalls or misfires, a faulty PCM or ECM may be the culprit. Relearning modules can restore performance and prevent further issues.<\/p>\n","protected":false},"author":1,"featured_media":525478,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[258,263],"tags":[52,56,943],"class_list":["post-532698","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-car","category-chrysler","tag-52","tag-chrysler","tag-lhs"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>1999 Chrysler LHS PCM\/ECM Relearn &amp; Replacement - 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\/1999-chrysler-lhs-pcm-replacement-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1999 Chrysler LHS PCM\/ECM Relearn &amp; Replacement - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"If your 1999 Chrysler LHS stalls or misfires, a faulty PCM or ECM may be the culprit. 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