{"id":20680,"date":"2025-12-23T13:04:29","date_gmt":"2025-12-23T18:04:29","guid":{"rendered":"https:\/\/gm-techlink.com\/?p=20680"},"modified":"2025-12-23T13:25:26","modified_gmt":"2025-12-23T18:25:26","slug":"engine-control-module-diagnosis-and-ecm-part-restriction","status":"publish","type":"post","link":"https:\/\/gm-techlink.com\/?p=20680","title":{"rendered":"Engine Control Module Diagnosis and ECM Part Restriction"},"content":{"rendered":"<p>The E01 Engine Control Module (ECM) for 2022-2026 CT4, CT5, Silverado, Sierra; 2023-2025 Envision; 2023-2026 Colorado, Canyon; and 2024-2025 XT4 models equipped with the 2.0L engine (RPO LSY) or 2.7L engine (RPO L3B) has been placed on a part restriction. The restriction will help gather product feedback before replacing the ECM. (Fig. 1)<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-20664\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F01-ECM-6-Sierra.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F01-ECM-6-Sierra.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F01-ECM-6-Sierra-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F01-ECM-6-Sierra-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F01-ECM-6-Sierra-200x130.jpg 200w\" sizes=\"(max-width: 740px) 100vw, 740px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Fig. 1<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>As part of diagnostic process, verify the vehicle condition is not related to a wiring\/connection issue or calibration update. Review the following bulletins for more information:<\/p>\n<ul>\n<li><strong>Bulletin #25-NA-197:<\/strong> Engine wiring harness chafing at the turbocharger heat shield or wastegate linkage \u2013 2023-2025 Colorado, Canyon (Fig. 2)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img decoding=\"async\" class=\"aligncenter wp-image-20665\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F02-ECM-1.jpg\" alt=\"\" width=\"789\" height=\"579\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F02-ECM-1.jpg 1152w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F02-ECM-1-300x220.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F02-ECM-1-1024x751.jpg 1024w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F02-ECM-1-768x563.jpg 768w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F02-ECM-1-75x55.jpg 75w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F02-ECM-1-780x572.jpg 780w\" sizes=\"(max-width: 789px) 100vw, 789px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Fig. 2<\/strong><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Bulletin #25-NA-301:<\/strong> Engine wiring harness chafing at multiple locations in the engine compartment, including the engine cover, cylinder head bolts or A\/C lines \u2013 2022-2025 Silverado, Sierra (Fig. 3)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img decoding=\"async\" class=\"aligncenter wp-image-20666\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F03-ECM-2.jpg\" alt=\"\" width=\"716\" height=\"596\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F03-ECM-2.jpg 891w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F03-ECM-2-300x250.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F03-ECM-2-768x640.jpg 768w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F03-ECM-2-66x55.jpg 66w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F03-ECM-2-780x650.jpg 780w\" sizes=\"(max-width: 716px) 100vw, 716px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Fig. 3<\/strong><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>#PIP6023C:<\/strong> Poor connection at the X160 connector between the engine wiring harness and the fuel injector wiring harness. The X160 connector connects the engine wiring harness to the fuel injectors, the fuel rail pressure and temperature sensors, and the knock sensors \u2013 2023-2025 Colorado, Silverado, Canyon, Sierra (Fig. 4)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-20667\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F04-ECM-4.jpg\" alt=\"\" width=\"685\" height=\"392\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F04-ECM-4.jpg 1345w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F04-ECM-4-300x172.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F04-ECM-4-1024x586.jpg 1024w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F04-ECM-4-768x440.jpg 768w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F04-ECM-4-96x55.jpg 96w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F04-ECM-4-780x447.jpg 780w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F04-ECM-4-1160x664.jpg 1160w\" sizes=\"(max-width: 685px) 100vw, 685px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Fig. 4<\/strong><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Bulletin #24-NA-180:<\/strong> Knock sensor service calibration update \u2013 2024 Colorado, Canyon<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Bulletin #25-NA-347:<\/strong> Engine wiring harness chafing between the ECM connector X2 and X201 at roughly 5 to 7 inches from the ECM. The contact and subsequent harness chafing point may be at the right-front suspension shock absorber mounting stud \u2013 2023-2026 Colorado, Canyon (Fig. 5)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-20668\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F05-ECM-3.jpg\" alt=\"\" width=\"637\" height=\"431\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F05-ECM-3.jpg 928w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F05-ECM-3-300x203.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F05-ECM-3-768x520.jpg 768w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F05-ECM-3-81x55.jpg 81w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2025\/12\/F05-ECM-3-780x528.jpg 780w\" sizes=\"(max-width: 637px) 100vw, 637px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Fig. 5<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>If the source of the vehicle condition is not identified after reviewing these bulletins, be sure to have the Service Information document that has led to ECM replacement available and be prepared to review the diagnostic steps that led to ECM replacement before contacting the Technical Assistance Center. Also refer to Document 5207120 \u2013 Testing for Intermittent Conditions and Poor Connections in the appropriate Service Information.<\/p>\n<p>For additional details, refer to #PIP6092A.<\/p>\n<p>&nbsp;<\/p>\n<p><em>&#8211; Thanks to Robert Halas<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The E01 Engine Control Module (ECM) for 2022-2026 CT4, CT5, Silverado, Sierra; 2023-2025 Envision; 2023-2026 Colorado, Canyon; and 2024-2025 XT4 models equipped with the 2.0L engine (RPO LSY) or 2.7L [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[222],"tags":[],"class_list":["post-20680","post","type-post","status-publish","format-standard","hentry","category-2025-december-b"],"_links":{"self":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/20680","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=20680"}],"version-history":[{"count":3,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/20680\/revisions"}],"predecessor-version":[{"id":20683,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/20680\/revisions\/20683"}],"wp:attachment":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20680"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20680"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20680"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}