{"id":10776,"date":"2025-11-07T18:07:37","date_gmt":"2025-11-07T22:07:37","guid":{"rendered":"https:\/\/www.calemonlaw.com\/blog\/?p=10776"},"modified":"2025-11-07T18:13:55","modified_gmt":"2025-11-07T22:13:55","slug":"cadillac-chevrolet-and-gmc-engine-coolant-control-valve-failure","status":"publish","type":"post","link":"https:\/\/www.calemonlaw.com\/blog\/?p=10776","title":{"rendered":"Cadillac, Chevrolet And GMC Engine Coolant Control Valve Failure"},"content":{"rendered":"\n<p>If you drive a <strong>Cadillac Escalade<\/strong>, <strong>Chevrolet Tahoe<\/strong>, <strong>Suburban<\/strong>, <strong>Silverado 1500<\/strong>, <strong>GMC Yukon<\/strong>, or <strong>Sierra 1500<\/strong>, you may have already seen a <strong>Check Engine Light<\/strong> related to a <strong>coolant control valve problem<\/strong>.<br>Many 2021\u20132023 GM vehicles\u2014especially those equipped with the <strong>3.0L Duramax diesel (LM2 or LZ0)<\/strong>\u2014have been affected by failures of the <strong>engine coolant control valve<\/strong>, sometimes called the <em>engine coolant flow control valve<\/em>.<\/p>\n\n\n\n<p>This part plays a crucial role in regulating coolant flow to help the engine maintain proper operating temperature. When it fails or sticks, it can cause check-engine lights, overheating, and even high-speed radiator fan operation after the engine is turned off.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What the Issue Is<\/strong><\/h2>\n\n\n\n<p>The <strong>engine coolant control valve<\/strong> manages how coolant circulates through the radiator and engine. When it fails, owners often report one or more of these <strong>diagnostic trouble codes (DTCs)<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>P1098<\/strong> \u2013 <em>Coolant Control Valve Performance<\/em> (common on 3.0L Duramax models; fans may run at high speed even after the key is off)<\/li>\n\n\n\n<li><strong>P26BB \/ P2B60<\/strong> \u2013 <em>Coolant Flow Control Valve Position\/Learn Faults<\/em><\/li>\n<\/ul>\n\n\n\n<p>These codes can trigger the <strong>Check Engine Light (MIL)<\/strong> and may cause excessive fan noise or poor temperature regulation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Vehicles Involved<\/strong><\/h2>\n\n\n\n<p>GM lists the following vehicles as potentially affected:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>2021\u20132023:<\/strong> Cadillac Escalade, Chevrolet Tahoe \/ Suburban, GMC Yukon \/ Yukon XL<\/li>\n\n\n\n<li><strong>2021\u20132022:<\/strong> Chevrolet Silverado 1500, GMC Sierra 1500<\/li>\n<\/ul>\n\n\n\n<p>The issue is most prevalent in vehicles with the <strong>3.0L Duramax diesel engine (LM2 or LZ0)<\/strong>, but can appear in some gasoline variants as well.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What GM Told Dealers to Do<\/strong><\/h2>\n\n\n\n<p>General Motors has released several <strong>Technical Service Bulletins (TSBs)<\/strong> and <strong>Preliminary Information (PI)<\/strong> documents to guide technicians:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>22-NA-082 (April 2022)<\/strong> \u2013 Software programming update for vehicles displaying P1098 \/ P26BB \/ P2B60 codes.<\/li>\n\n\n\n<li><strong>PIP5791A (January 2022)<\/strong> \u2013 Directs technicians to command the valve open and closed multiple times to verify function before replacement.<\/li>\n\n\n\n<li><strong>Earlier PI (2019 \u2192 carried forward)<\/strong> \u2013 Replace the valve and perform a relearn if previous codes were logged and diagnostics confirm failure.<\/li>\n\n\n\n<li><strong>21-NA-271 (August 2023)<\/strong> \u2013 Advises checking for <strong>kinked cooling hoses<\/strong> that can cause similar fault codes before replacing the valve.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Special Coverage Program for 3.0L Duramax Models<\/strong><\/h2>\n\n\n\n<p>In <strong>September 2025<\/strong>, GM announced a <strong>Special Coverage Program<\/strong> for the coolant control valve affecting certain <strong>3.0L Duramax<\/strong> models.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coverage up to <strong>15 years \/ 150,000 miles (240,000 km)<\/strong> from the vehicle\u2019s in-service date<\/li>\n\n\n\n<li>Applies to Silverado 1500, Sierra 1500, and full-size SUVs equipped with 3.0L Duramax engines<\/li>\n\n\n\n<li>Covers <strong>replacement of the coolant control valve<\/strong> and related programming if diagnostics confirm failure.<\/li>\n\n\n\n<li>Program IDs: <strong>N252508340<\/strong> and <strong>N252508341<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What Owners Should Do<\/strong><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Get the codes read<\/strong> \u2013 Look specifically for <strong>P1098<\/strong>, <strong>P26BB<\/strong>, or <strong>P2B60<\/strong>.<\/li>\n\n\n\n<li><strong>Visit your GM dealer<\/strong> \u2013 Mention <strong>TSB 22-NA-082<\/strong> and <strong>Special Coverage N252508340\/N252508341<\/strong>.<\/li>\n\n\n\n<li><strong>Ask for a diagnostic and repair under warranty coverage<\/strong> if applicable.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>California Lemon Law: Repeated Coolant Valve Problems Could Mean Your Vehicle Is a Lemon<\/strong><\/h2>\n\n\n\n<p>If your GM SUV or truck has been in the shop <strong>multiple times<\/strong> for the repeated issues\u2014or has been <strong>out of service for an extended period<\/strong> due to repeated repairs\u2014you may have additional protection under the <strong>California Lemon Law<\/strong> (formally the <em>Song-Beverly Consumer Warranty Act<\/em>).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>When Lemon Law Might Apply<\/strong><\/h3>\n\n\n\n<p>You may qualify if:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The vehicle is <strong>still under the manufacturer\u2019s warranty<\/strong> (including extended \u201cspecial coverage\u201d programs).<\/li>\n\n\n\n<li>The dealer has <strong>attempted several repairs<\/strong> for the same problem without success.<\/li>\n\n\n\n<li>The issue <strong>substantially impairs<\/strong> the vehicle\u2019s use, value, or safety (for example, repeated overheating or engine cooling failure).<\/li>\n\n\n\n<li>The vehicle has spent a <strong>significant number of days in the shop<\/strong> for warranty-related repairs.<\/li>\n<\/ul>\n\n\n\n<p>If those conditions apply, California law may require <strong>GM to repurchase or replace<\/strong> your vehicle.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>How to Take Action<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Keep records<\/strong> of all service visits, repair orders, and communication with your dealer.<\/li>\n\n\n\n<li><strong>Request a copy<\/strong> of your vehicle\u2019s repair history and diagnostic codes.<\/li>\n\n\n\n<li><strong>Consult a California Lemon Law attorney<\/strong> or consumer-protection advocate if your issue persists after repeated repairs.<\/li>\n<\/ol>\n\n\n\n<p><em>(Tip: Lemon Law claims can often be handled at no cost to the consumer\u2014attorney fees are typically paid by the manufacturer if you prevail.)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you drive a Cadillac Escalade, Chevrolet Tahoe, Suburban, Silverado 1500, GMC Yukon, or Sierra 1500, you may have already seen a Check Engine Light related to a coolant control valve problem.Many 2021\u20132023 GM vehicles\u2014especially those equipped with the 3.0L Duramax diesel (LM2 or LZ0)\u2014have been affected by failures of the engine coolant control valve,&hellip; <a href=\"https:\/\/www.calemonlaw.com\/blog\/?p=10776\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":10778,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,79,10,78,15,1521,1317],"tags":[1078,1249,1646,1016],"class_list":["post-10776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-miscellaneous","category-cadillac","category-california-lemon-law","category-chevrolet","category-general-motors","category-gmc","category-lemon-alert","tag-check-engine-light","tag-engine-cooling-problem","tag-lemon-alert","tag-lemon-law-attorney"],"_links":{"self":[{"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/10776","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=10776"}],"version-history":[{"count":4,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/10776\/revisions"}],"predecessor-version":[{"id":10782,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/10776\/revisions\/10782"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=\/wp\/v2\/media\/10778"}],"wp:attachment":[{"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.calemonlaw.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}