{"id":524880,"date":"2026-07-16T09:07:51","date_gmt":"2026-07-16T13:07:51","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=524880"},"modified":"2026-07-19T11:35:52","modified_gmt":"2026-07-19T15:35:52","slug":"2020-chevrolet-trax-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2020-chevrolet-trax-pcm-replacement-guide\/","title":{"rendered":"2020 Chevrolet Trax PCM and ECM Replacement Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2020 Chevrolet Trax PCM and ECM Replacement Guide<\/h1>\n<p class=\"hero-subtitle\">In the 2020 Chevrolet Trax, the Powertrain Control Module (PCM) and Engine Control Module (ECM) manage engine and transmission functions. Failure of either unit can cause loss of power, stalling, or communication errors, often flagged by internal diagnostic codes.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>PCM removal typically takes about 0.6 hours of labor.<\/li>\n<li>ECM replacement also requires roughly 0.6 hours of work.<\/li>\n<li>Both modules need a relearn or reset procedure after installation.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>When a 2020 Chevrolet Trax begins to exhibit erratic power delivery, unexpected stalling, or a suite of diagnostic codes, the underlying cause may be a faulty Powertrain Control Module or Engine Control Module. Understanding how these computers operate, what the repair entails, and what steps follow a replacement can help you make an informed decision about keeping your vehicle on the road. This guide walks you through the location, labor expectations, programming requirements, and common symptoms, so you know exactly what to expect if you choose to replace the PCM or ECM yourself or with a professional shop.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2020 Chevrolet Trax<\/h2>\n<p>The Powertrain Control Module and Engine Control Module in the 2020 Chevrolet Trax serve as the central brains for engine timing, fuel delivery, and transmission shift logic. By constantly monitoring sensor inputs, they adjust parameters to maintain optimal performance and emissions compliance. When either module fails, the vehicle may lose the ability to control engine speed or shift gears correctly, leading to drivability issues. Because the PCM also governs transmission behavior, a fault can affect both power and shift quality. The modules communicate with the vehicle\u2019s diagnostics via the OBD\u2011II port, allowing technicians to retrieve fault codes. For owners looking to replace these units, understanding that <a href=\"https:\/\/www.fs1inc.com\/gm\/chevrolet-pcm-ecm-ecu-engine-computer\/trax-engine-computers.html\">replacement engine computers for the 2020 Chevrolet Trax<\/a> is essential to ensure the new hardware matches the vehicle\u2019s specifications.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>Both the PCM and ECM are mounted within the engine compartment of the 2020 Chevrolet Trax, typically secured to the firewall or near the intake manifold. Removing the unit involves disconnecting the battery negative cable, then unplugging the harnesses and any mounting bolts. Labor estimates from the manufacturer suggest that swapping the Powertrain Control Module requires about 0.6 hours, while the Engine Control Module removal also averages 0.6 hours. After the hardware is replaced, the technician must perform a relearn procedure for the PCM (0.5 hours) or a reset for the ECM (0.3 hours) to ensure the vehicle\u2019s control strategies are reinitialized correctly.<\/p>\n<div style=\"background:#f7f9fc;border:1px solid #e2e8f2;border-radius:10px;padding:18px 24px;margin:18px 0\">\n<h3 style='margin-top:0'>How to Reach the PCM on the 2020 Chevrolet Trax<\/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>Disconnect<\/b> the charge air cooler outlet air hose from the throttle body.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the electrical connectors from the engine control module.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Unclip<\/b> the engine control module bracket from the battery tray.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Remove<\/b> any debris from around the control module 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 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\">0.6 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\">0.6 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module Reset<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.3 hr<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Programming Requirements After Replacement<\/h2>\n<p>Factory service instructions indicate that after installing a new PCM or ECM, the technician should disconnect and reconnect the battery negative cable, then run a relearn or reset routine using a scan tool. Flagship One provides units that arrive VIN\u2011programmed, so <a href=\"https:\/\/www.fs1inc.com\/2020-chevrolet-trax-1-4l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">a VIN-programmed replacement unit<\/a> eliminates the need for the post\u2011install programming steps, allowing the vehicle to return to service more quickly.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>Owners of a 2020 Chevrolet Trax may notice a range of issues when the PCM or ECM is compromised, including a complete no\u2011start condition, intermittent stalling, rough idle, or loss of transmission shifting capability. Diagnostic scans often reveal internal codes such as <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0601-internal-control-module-memory-checksum-error\/\">Powertrain control module communication error<\/a> which points directly to a failure within the module itself. Additional signs can include erratic sensor readings, reduced fuel efficiency, and the illumination of the check engine light. These symptoms typically arise because the computer can no longer process sensor data or command actuators correctly.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2020 Chevrolet Trax<\/h2>\n<p>The following internal trouble codes have been documented for the 2020 Chevrolet Trax and may appear when the PCM or ECM is malfunctioning:<\/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\"><b>P060A<\/b><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Module-internal fault<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">&mdash;<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><b>P060B<\/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>P060C<\/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-p0610-control-module-vehicle-options-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0610<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0610-control-module-vehicle-options-error\/\" 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-p0610-control-module-vehicle-options-error\/\" style=\"color:#0563C1\"><b><u>Full P0610 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<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Protecting the PCM in Your 2020 Chevrolet Trax<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Maintain a healthy charging system to avoid voltage fluctuations that can damage the modules.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure all ground connections are clean and secure.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid excessive voltage spikes from jump\u2011starts or power accessories.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address any diagnostic codes promptly before they exacerbate module stress.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Inspect connector seals regularly to keep moisture out.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Keep the battery terminals free of corrosion.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>What are the typical labor times for replacing the PCM in a 2020 Chevrolet Trax?<\/h3>\n<p>The factory book time for removing and installing the Powertrain Control Module on a 2020 Chevrolet Trax is about 0.6 hours, plus an additional 0.5 hours for the relearn procedure.<\/p>\n<h3>Do I need special tools to reset the ECM after replacement in my 2020 Chevrolet Trax?<\/h3>\n<p>A scan tool is required to perform the ECM reset, which takes roughly 0.3 hours according to the service manual.<\/p>\n<h3>Can a VIN\u2011programmed replacement unit eliminate the need for post\u2011install coding?<\/h3>\n<p>Yes, Flagship One units arrive pre\u2011programmed to the vehicle\u2019s VIN, so the factory\u2011required relearn steps are already satisfied.<\/p>\n<h3>What code indicates a communication failure inside the powertrain module?<\/h3>\n<p>Code P0601 signals a powertrain control module communication error, which often points to a PCM or ECM fault.<\/p>\n<h3>Is it necessary to disconnect the battery before removing the ECM?<\/h3>\n<p>The service procedure advises disconnecting the battery negative cable and capturing ECM data with a scan tool before removal.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>When the PCM or ECM in your 2020 Chevrolet Trax shows signs of failure, you can choose a brand\u2011new replacement or a professionally refurbished unit. Both options restore the vehicle\u2019s control functions, but a refurbished module from Flagship One may offer a cost\u2011effective solution while still meeting factory specifications.<\/p>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2020-chevrolet-trax-1-4l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2020 Chevrolet Trax<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/gm\/chevrolet-pcm-ecm-ecu-engine-computer\/trax-engine-computers.html\">Chevrolet Trax module lineup<\/a> covers other engine configurations as well.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Final Thoughts<\/h2>\n<p>If you\u2019re dealing with PCM or ECM issues in your 2020 Chevrolet Trax, understanding the repair steps and post\u2011install requirements can help you decide the best path forward. Consider all options and ensure the work follows the outlined procedures for a reliable outcome.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>If your 2020 Chevrolet Trax shows powertrain codes, you may need PCM or ECM work. Learn the risks, steps, and outcomes for a reliable fix.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[258,274],"tags":[676,67,1286],"class_list":["post-524880","post","type-post","status-publish","format-standard","hentry","category-car","category-chevrolet","tag-676","tag-chevrolet","tag-trax"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2020 Chevrolet Trax PCM and ECM 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\/2020-chevrolet-trax-pcm-replacement-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2020 Chevrolet Trax PCM and ECM Replacement Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"If your 2020 Chevrolet Trax shows powertrain codes, you may need PCM or ECM work. 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