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Covers warning lights, gauges, indicators, and information displays, with emphasis on Malfunction Indicator Lamp behavior and Diesel Exhaust Fluid (DEF) warnings. Includes cautions about continued driving with active alerts, potential impacts on emission systems and fuel economy, and steps for emissions inspection/maintenance readiness via the Data Link Connector (DLC).",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/2021-duramax-diesel-supplement-operating-and-maintenance-guide/661905/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/2021-duramax-diesel-supplement-operating-and-maintenance-guide/661905.png","ImageObject",300,407,{"name":92,"@type":93},"naya.afterrain","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does the Malfunction Indicator Lamp (Check Engine Light) indicate?","Question",{"text":112,"@type":113},"It indicates a malfunction in the vehicle’s emission control on-board diagnostic system. If it is on while the engine is running, the vehicle may require service.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Why can the Diesel Exhaust Fluid (DEF) warning light appear?",{"text":117,"@type":113},"It can come on when the system detects a problem with the Diesel Exhaust Fluid (DEF) management system. The supplement directs readers to the DEF section for details.",{"name":119,"@type":110,"acceptedAnswer":120},"What should be considered for emissions inspection/maintenance testing?",{"text":121,"@type":113},"The test equipment typically connects to the vehicle’s Data Link Connector (DLC) under the instrument panel left of the steering wheel. Devices not used for the test or service may affect vehicle operation, and certain warning-light conditions can cause the vehicle to fail inspection.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},661905,1793187952,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":144},962094248482,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","Contents  \nIntroduction .............................. 1  \nInstruments and Controls ................. 3  \nDriving and Operating .................... 8  \nVehicle Care ............................. 24  \nService and Maintenance ................ 41  \nTechnical Data .......................... 49  \nIndex ........................... 52  \nLitho in U.S.A.  \nPart No. 84557033 C Third Printing  \nIntroduction  \nThe names, logos, emblems, slogans, vehicle model names, and vehicle body designs appearing in this manual including, but not limited to, GM, the GM logo, CHEVROLET, GMC, the CHEVROLET and GMC Truck Emblems, SILVERADO, TAHOE, SUBURBAN, SIERRA, YUKON, DENALI, and Duramax are trademarks and/or service marks of General Motors LLC, its subsidiaries, affiliates, or licensors.  \nFor vehicles first sold in Canada, substitute the name “General Motors of Canada Company” for GMC and Chevrolet Motor Division wherever they appear in this manual.  \nThis manual describes features that may or may not be on the vehicle because of optional equipment that was not purchased on the vehicle, model variants, country specifications, features/applications that may not be available in your region, or changes subsequent to the printing of this owner’s manual.  \nRefer to the purchase documentation relating to your specific vehicle to confirm the features.  \nThis manual contains information that pertains to the operation of the diesel engine. It also contains the Diesel Maintenance Schedule. The sections in this manual correspond to the sections in the owner’s manual. This manual, along with the owner’s manual, will assist you in the proper use and maintenance of the vehicle.  \nKeep this manual in the vehicle for quick reference.  \nCanadian Vehicle Owners  \nA French language manual can be obtained from your dealer, [at www.helminc.com](at www.helminc.com), or from:  \nPropriétaires Canadiens  \nOn peut obtenir un exemplaire de ce guide en français auprès du concessionnaire ou à l'adresse suivante:  \n© 2021 General Motors LLC. All Rights Reserved.  \nHelm, Incorporated Attention: Customer Service 47911 Halyard Drive Plymouth, MI 48170  \nUSA  \nUsing this Supplement  \nThis supplement contains information specific to the unique components of the vehicle. It does not explain everything you need to know about the vehicle. Read this supplement along with the owner’s manual to learn about the vehicle's features and controls.  \nIndex  \nA good place to look for what you need is the Index in the back of this supplement. It is an alphabetical list of what is in the supplement, and the page number where you will find it.  \nInstruments and Controls  \nWarning Lights, Gauges, and Indicators  \nInstrument Cluster ....................... 3  \nMalfunction Indicator Lamp (Check Engine Light) .................................. 5  \nWait-to-Start Light ....................... 6  \nDiesel Exhaust Fluid (DEF) Warning Light ................................... 7  \nInformation Displays  \nDriver Information Center (DIC) .......... 7  \nWarning Lights, Gauges, and Indicators Instrument Cluster  \nBase Level Chevrolet English Cluster Shown, Metric Similar  \nUplevel Chevrolet English Cluster Shown, Metric Similar  \nUplevel GMC English Cluster Shown, Metric Similar  \nMalfunction Indicator Lamp (Check Engine Light)  \nThis light is part of the vehicle’s emission control on-board diagnostic system. If this light is on while the engine is running, a malfunction has been detected and the vehicle may require service. The light should come on to show that it is working when  \nthe ignition is on with the engine not running. See “Ignition Positions” in the owner’s manual.  \nThis light may also come on when the system has detected a problem with the Diesel Exhaust Fluid (DEF) management system. See Diesel Exhaust Fluid 0 12.  \n\n| \u003Cbr>Malfunctions are often indicated by the system before any problem is noticeable. Being aware of the light and seeking service promptly when it comes on may prevent damage. |  |\n|","cbCainAhKYiviQ1p","https://ap.wps.com/l/cbCainAhKYiviQ1p","pdf",1927090,56,"English","# Introduction\n## Instruments and Controls\n## Driving and Operating\n## Vehicle Care\n## Service and Maintenance\n## Technical Data\n## Index","[{\"question\":\"What does the Malfunction Indicator Lamp (Check Engine Light) indicate?\",\"answer\":\"It indicates a malfunction in the vehicle’s emission control on-board diagnostic system. If it is on while the engine is running, the vehicle may require service.\"},{\"question\":\"Why can the Diesel Exhaust Fluid (DEF) warning light appear?\",\"answer\":\"It can come on when the system detects a problem with the Diesel Exhaust Fluid (DEF) management system. The supplement directs readers to the DEF section for details.\"},{\"question\":\"What should be considered for emissions inspection/maintenance testing?\",\"answer\":\"The test equipment typically connects to the vehicle’s Data Link Connector (DLC) under the instrument panel left of the steering wheel. Devices not used for the test or service may affect vehicle operation, and certain warning-light conditions can cause the vehicle to fail inspection.\"}]","2021 Duramax Diesel Supplement - Operating and Maintenance Guide | PDF",141]