{"id":16027,"date":"2022-03-16T09:45:00","date_gmt":"2022-03-16T13:45:00","guid":{"rendered":"https:\/\/gm-techlink.com\/?p=16027"},"modified":"2022-03-16T09:45:00","modified_gmt":"2022-03-16T13:45:00","slug":"aero-shutter-diagnostic-tips","status":"publish","type":"post","link":"https:\/\/gm-techlink.com\/?p=16027","title":{"rendered":"Aero Shutter Diagnostic Tips"},"content":{"rendered":"<p>The aero shutters on some 2019-2021 Silverado 1500, Tahoe, Suburban, Sierra 1500, Yukon, Escalade; 2020-2021 Silverado 2500HD\/3500HD and Sierra 2500HD\/3500HD models may have several conditions that could potentially cause improper shutter operation. (Fig. 1) Several DTCs may be set, depending on the specific conditions. When checking aero shutter operation, be sure to look for electrical integrity issues, displaced louvers\/vanes, and debris that may block movement.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-16000\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F01-shutter-4.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F01-shutter-4.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F01-shutter-4-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F01-shutter-4-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F01-shutter-4-200x130.jpg 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 1<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>Here are a few tips to follow when diagnosing any aero shutter conditions on these vehicles. Refer to Bulletin #21-NA-077 for complete details on all diagnostic steps.<\/p>\n<p><strong>TIP:<\/strong> A shutter performance issue will always set DTC P059F (Active Grille Air Shutter 1 Performance) and U0284 (Lost Communication with Active Grille Air Shutter Actuator 1) for the upper shutters and DTC P05AE (Active Grille Air Shutter 2 Performance) and U0285 (Lost Communication with Active Grille Air Shutter Actuator 2) for the lower shutters. Shutters should never be replaced if these DTCs are not present.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Communication Concerns<\/strong><\/p>\n<p>Check for DTCs U0284 and U0285. On light-duty trucks, these codes may be paired with DTCs U0632 (Lost Communication with Cooling Fan Motor), U0633 (Lost Communication with Engine Cooling Fan 2), U01B0 (Lost Communication with Battery Monitor Module) or U1345 (Engine Control Module LIN Bus 1).<\/p>\n<p>If any of these codes are set, check the integrity of the following components:<\/p>\n<ul>\n<li>Aero shutter fuse<\/li>\n<li>Engine wiring harness<\/li>\n<li>Jumper harness to the shutter actuators<\/li>\n<li>X133 connector and other connectors to the aero shutter<\/li>\n<li>J170 splice (light-duty trucks only); even a small amount of movement of the splice may cause an intermittent communication issue (Fig. 2)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-16001\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F02-shutter-1.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F02-shutter-1.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F02-shutter-1-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F02-shutter-1-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F02-shutter-1-200x130.jpg 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 2<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Shutter Obstructions<\/strong><\/p>\n<p>If DTCs P059F and P05AE are set, check for any debris in the upper and lower shutters (Fig. 3), a louver\/vane that is disengaged from the linkage, or a shutter that is binding. Try to remove any debris by hand or using compressed air before removing the front fascia of the vehicle or the shutter.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-16002\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F03-shutter-2.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F03-shutter-2.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F03-shutter-2-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F03-shutter-2-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F03-shutter-2-200x130.jpg 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 3<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>On light-duty trucks, the upper shutter may be binding on the air induction plenum (upper driver\u2019s side).<\/p>\n<p>On SUVs as well as light-duty trucks, the upper shutter also may be binding on the horn or bracket (upper passenger\u2019s side). There should be at least 0.40 inches (10 mm) of clearance between the shutter louver\/vane and horn. (Fig. 4, #1)<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-16003\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F04-shutter-3.jpg\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F04-shutter-3.jpg 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F04-shutter-3-300x195.jpg 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F04-shutter-3-85x55.jpg 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/03\/F04-shutter-3-200x130.jpg 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 4<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>TIP:<\/strong> For 2020-2021 Silverado 2500HD\/3500HD models with a fourth lower row of louvers\/vanes, refer to Bulletin #21-NA-071 for the Lower Shutter Louver Modification procedure.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Shutter Test<\/strong><\/p>\n<p>Functionally test each shutter assembly to fully open and fully closed twice. If the shutters fully open and fully close twice without any stoppages, do not replace the shutter assembly.<\/p>\n<p><strong>TIP:<\/strong> On 2019-2021 Silverado 1500 and Sierra 1500 models and 2020-2021 Silverado 2500HD\/3500HD and Sierra 2500HD\/3500HD models equipped with upper and lower shutters, the top passenger-side louver\/vane of the upper shutter is intentionally missing from the shutter assembly for airflow reasons. Do not replace the shutter for the missing louver\/vane.<\/p>\n<p>Refer to Bulletin #21-NA-077 for additional information.<\/p>\n<p>&nbsp;<\/p>\n<p><em>&#8211; Thanks to David MacGillis, Kevin Minor and Hassan Abdallah<\/em><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The aero shutters on some 2019-2021 Silverado 1500, Tahoe, Suburban, Sierra 1500, Yukon, Escalade; 2020-2021 Silverado 2500HD\/3500HD and Sierra 2500HD\/3500HD models may have several conditions that could potentially cause improper [&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":[108],"tags":[],"class_list":["post-16027","post","type-post","status-publish","format-standard","hentry","category-2022-march-b"],"_links":{"self":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/16027","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=16027"}],"version-history":[{"count":1,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/16027\/revisions"}],"predecessor-version":[{"id":16028,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/16027\/revisions\/16028"}],"wp:attachment":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16027"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}