{"id":10654,"date":"2025-08-16T14:17:45","date_gmt":"2025-08-16T18:17:45","guid":{"rendered":"https:\/\/www.calemonlaw.com\/blog\/?p=10654"},"modified":"2025-08-22T14:08:42","modified_gmt":"2025-08-22T18:08:42","slug":"brake-pressure-switch-safety-defect-in-chevrolet-silverado-medium-duty-trucks","status":"publish","type":"post","link":"https:\/\/www.calemonlaw.com\/blog\/?p=10654","title":{"rendered":"Brake Pressure Switch Safety Defect in Chevrolet Silverado Medium Duty Trucks"},"content":{"rendered":"\n<p>General Motors (GM) has confirmed a <strong>serious safety defect<\/strong> affecting certain <strong>2019\u20132024 Chevrolet Silverado Medium Duty trucks<\/strong>. This issue involves the <strong>brake pressure sensor assembly<\/strong>, which may allow brake fluid to leak into the electrical components of the brake pressure switch. Over time, the defect can lead to <strong>short circuits, loss of brake system function, and even under hood fires<\/strong>, creating a significant risk of property damage and personal injury.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Models Are Affected?<\/h2>\n\n\n\n<p>The following Chevrolet Silverado Medium Duty trucks are included in this safety defect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>2019 Chevrolet 6500<\/strong><\/li>\n\n\n\n<li><strong>2019\u20132024 Chevrolet Silverado 4500<\/strong><\/li>\n\n\n\n<li><strong>2019\u20132021, 2023\u20132024 Chevrolet Silverado 5500<\/strong><\/li>\n\n\n\n<li><strong>2019, 2021\u20132024 Chevrolet Silverado 6500<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Trucks produced before 2019 use a different brake sensor design and are not affected. Certain <strong>2024 Silverado Medium Duty models<\/strong> built with a brake switch wire harness that includes silicone sealant are also excluded.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why This Is a Safety Concern<\/h2>\n\n\n\n<p>If brake fluid leaks past the diaphragm seal into the electrical portion of the brake pressure sensor:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>switch and fuse can short circuit<\/strong>.<\/li>\n\n\n\n<li>The circuit may generate <strong>excessive heat<\/strong>, leading to a fire risk.<\/li>\n\n\n\n<li>A fire can occur even <strong>when the vehicle is parked and unattended<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>This is not only a performance issue but a <strong>direct safety hazard<\/strong> for owners and the public.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Chronology of Events Leading to the Defect Finding<\/h2>\n\n\n\n<p>The journey to identifying this defect spans several years, beginning with earlier issues and continuing into 2025:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>April 13, 2023<\/strong> \u2013 GM issued NHTSA Recall 23V-266 addressing zinc sealant fragmentation in brake pressure sensors that could cause brake fluid leaks and under hood fires.<\/li>\n\n\n\n<li><strong>October 11, 2024<\/strong> \u2013 GM\u2019s quality team received a report of unintended brake pump activation in a 2023 Silverado Medium Duty truck that was <em>not<\/em> part of the earlier recall. The issue was escalated through the <strong>Speak Up For Safety (SUFS)<\/strong> program.<\/li>\n\n\n\n<li><strong>November 24, 2024<\/strong> \u2013 GM opened a formal investigation after discovering brake fluid in the wiring harness of the newer sensor design.<\/li>\n\n\n\n<li><strong>December 18, 2024<\/strong> \u2013 Another field report surfaced involving a 2021 Silverado truck already repaired under the 23V-266 campaign. GM\u2019s analysis confirmed fluid intrusion.<\/li>\n\n\n\n<li><strong>January 2025<\/strong> \u2013 Additional warranty-returned parts tested positive for brake fluid contamination in the harness.<\/li>\n\n\n\n<li><strong>March 3, 2025<\/strong> \u2013 GM and International Motors partnered with Akron Rubber Development Lab (ARDL) for material analysis.<\/li>\n\n\n\n<li><strong>April 24, 2025<\/strong> \u2013 Testing revealed that the rubber diaphragm was degrading due to the supplier\u2019s use of an <strong>unauthorized chemical<\/strong> that reacted with brake fluid.<\/li>\n\n\n\n<li><strong>April 30, 2025<\/strong> \u2013 GM identified one confirmed fire among 160 reports and began deeper field analysis.<\/li>\n\n\n\n<li><strong>May 28, 2025<\/strong> \u2013 GM inspected the affected vehicle and concluded the fire was linked to the defect.<\/li>\n\n\n\n<li><strong>June 5, 2025<\/strong> \u2013 GM\u2019s Safety Field Action Decision Authority (SFADA) determined a <strong>safety defect existed<\/strong> in 2019\u20132024 Silverado Medium Duty trucks.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">The Cause of the Safety Defect<\/h2>\n\n\n\n<p>Investigations revealed that a <strong>supplier used an unauthorized chemical<\/strong> in the rubber diaphragm of the brake pressure sensor assembly. This material degraded when exposed to brake fluid, allowing leaks into the sensor\u2019s electrical system and creating the potential for fires.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Warning Signs Owners May See<\/h2>\n\n\n\n<p>Drivers may notice a <strong>\u201cService Brake System\u201d warning light<\/strong> on the dashboard as the defect develops. GM advises that vehicles should be <strong>parked outdoors and away from buildings<\/strong> until the problem is corrected.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Fix for Silverado Owners<\/h2>\n\n\n\n<p>GM\u2019s remedy involves replacing the <strong>brake pressure switch wire harness<\/strong> with an improved design.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Interim owner notifications<\/strong> were mailed on <strong>July 29, 2025<\/strong>.<\/li>\n\n\n\n<li>A <strong>second notification<\/strong> will be sent once parts are fully available.<\/li>\n\n\n\n<li>Vehicles that were previously repaired under Recall 23V-266 will also require the updated repair.<\/li>\n<\/ul>\n\n\n\n<p>GM has assigned this campaign <strong>number N242482680<\/strong>, and the <strong>NHTSA campaign number is 25V-390<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>General Motors (GM) has confirmed a serious safety defect affecting certain 2019\u20132024 Chevrolet Silverado Medium Duty trucks. This issue involves the brake pressure sensor assembly, which may allow brake fluid to leak into the electrical components of the brake pressure switch. Over time, the defect can lead to short circuits, loss of brake system function,&hellip; <a href=\"https:\/\/www.calemonlaw.com\/blog\/?p=10654\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,78,15,1317],"tags":[1149,1246,1115,1354],"class_list":["post-10654","post","type-post","status-publish","format-standard","hentry","category-miscellaneous","category-chevrolet","category-general-motors","category-lemon-alert","tag-automobile-fire","tag-fire-risk","tag-manufacturer-defect","tag-repeated-repair-attempts"],"_links":{"self":[{"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/10654","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10654"}],"version-history":[{"count":4,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/10654\/revisions"}],"predecessor-version":[{"id":10658,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/10654\/revisions\/10658"}],"wp:attachment":[{"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}