{"id":12389,"date":"2019-12-13T12:16:36","date_gmt":"2019-12-13T17:16:36","guid":{"rendered":"https:\/\/techlink.mynetworkcontent.com\/?p=12389"},"modified":"2019-12-13T12:16:36","modified_gmt":"2019-12-13T17:16:36","slug":"cooling-fans-running-for-an-extended-period","status":"publish","type":"post","link":"https:\/\/gm-techlink.com\/?p=12389","title":{"rendered":"Cooling Fans Running for an Extended Period"},"content":{"rendered":"<p>Some 2020 Silverado 1500 and Sierra 1500 models equipped with the 3.0L diesel engine (RPO LM2) (Fig. 12) may have the engine cooling fans running continuously for an extended period of time. The Check Engine MIL also may be illuminated.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-12374\" src=\"https:\/\/techlink.mynetworkcontent.com\/wp-content\/uploads\/2019\/12\/F12-30-duramax-diesel.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/12\/F12-30-duramax-diesel.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/12\/F12-30-duramax-diesel-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/12\/F12-30-duramax-diesel-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2019\/12\/F12-30-duramax-diesel-200x130.jpg 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 12<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>Currently, an engine calibration in the Engine Control Module (ECM) will falsely set DTC P0111 (Intake Air Temperature (IAT) Sensor 1 Performance), which occurs when the engine block heater is used in ambient temperatures above 0\u00b0F\/\u201318\u00b0C. As a result, the cooling system will go into remedial action and turn on the cooling fans at 100%. The remedial action will continue until the engine goes through a six hour cold soak.<\/p>\n<p>If this condition is found, clear the DTC and return the vehicle to the customer. Do not perform any further diagnosis or replace any related components. An updated calibration will be available shortly.<\/p>\n<p>Also inform the customer to avoid engine block heater use in temperatures above 0\u00b0F\/\u201318\u00b0C. While the owner\u2019s manual states an engine block heater should be used in temperatures less than 0\u00b0F\/\u201318\u00b0C, it isn\u2019t vital until much lower temperatures of less than \u201313\u00b0F\/\u201325\u00b0C.<\/p>\n<p>&nbsp;<\/p>\n<p><em>&#8211; Thanks to Robert Bastien<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Some 2020 Silverado 1500 and Sierra 1500 models equipped with the 3.0L diesel engine (RPO LM2) (Fig. 12) may have the engine cooling fans running continuously for an extended period [&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":[1],"tags":[],"class_list":["post-12389","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/12389","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=12389"}],"version-history":[{"count":1,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/12389\/revisions"}],"predecessor-version":[{"id":12390,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/12389\/revisions\/12390"}],"wp:attachment":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}