{"id":855,"date":"2026-03-15T15:15:45","date_gmt":"2026-03-15T19:15:45","guid":{"rendered":"https:\/\/www.4roadservice.com\/resources\/?page_id=855"},"modified":"2026-03-15T15:15:48","modified_gmt":"2026-03-15T19:15:48","slug":"detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high","status":"publish","type":"page","link":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/","title":{"rendered":"Detroit Diesel SPN 3031 FMI 16 \u2013 DEF Tank Temperature High (Meaning, Causes &amp; Fix)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-fault-codes-dd13-dd15-dd16\/\">\u2190 Back to Detroit Diesel Fault Codes<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Detroit Diesel SPN 3031 FMI 16 indicates that the DEF tank temperature has risen above the acceptable operating range. This code appears on DD13, DD15, and DD16 engines and is important to address promptly as excessive heat can degrade DEF fluid quality, damage the DEF tank and components, and affect SCR system performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Symptoms<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check engine light on <\/li>\n\n\n\n<li>DEF or SCR warning light illuminated <\/li>\n\n\n\n<li>DEF fluid may degrade faster than normal <\/li>\n\n\n\n<li>SCR system performance may be affected <\/li>\n\n\n\n<li>Engine derate possible if DEF quality is compromised<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Cause<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This code triggers when the DEF tank temperature sensor detects fluid above the maximum acceptable threshold. Common causes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faulty DEF tank cooling system <\/li>\n\n\n\n<li>DEF tank heater stuck in the on position <\/li>\n\n\n\n<li>Excessive heat exposure from nearby exhaust components <\/li>\n\n\n\n<li>Faulty DEF temperature sensor giving false high readings <\/li>\n\n\n\n<li>Operating in extremely high ambient temperatures <\/li>\n\n\n\n<li>Blocked or restricted DEF tank cooling lines<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Can You Keep Driving?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Short distances may be possible but prolonged exposure to high temperatures will degrade DEF fluid quality and can damage the tank and dosing components. If DEF quality becomes compromised a derate condition will follow. Address this fault promptly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Action<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Check the DEF tank heater to ensure it is not stuck in the on position. Inspect the DEF tank cooling system and lines for blockages or failures. If the temperature reading seems inconsistent with conditions, have the DEF temperature sensor tested. Allow the system to cool and recheck before continuing operation.<\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1773601924855\"><strong class=\"schema-faq-question\">What does Detroit Diesel SPN 3031 FMI 16 mean?<\/strong> <p class=\"schema-faq-answer\">It means the DEF tank temperature has risen above the acceptable operating range, which can degrade DEF fluid quality and affect SCR system performance.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773601927252\"><strong class=\"schema-faq-question\">What causes SPN 3031 FMI 16?<\/strong> <p class=\"schema-faq-answer\">The most common causes are a DEF tank heater stuck on, a failed cooling system for the DEF tank, excessive heat from nearby exhaust components, or a faulty DEF temperature sensor.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773601926860\"><strong class=\"schema-faq-question\">Can I keep driving with SPN 3031 FMI 16?<\/strong> <p class=\"schema-faq-answer\">Short distances may be possible but continued operation with high DEF tank temperature risks degrading the fluid and damaging dosing components, which can lead to further faults and derate.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773601926524\"><strong class=\"schema-faq-question\"><strong>Will SPN 3031 FMI 16 cause a derate?<\/strong><\/strong> <p class=\"schema-faq-answer\">It can if the high temperature condition degrades DEF quality to the point where the SCR system can no longer meet emissions thresholds.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773601926116\"><strong class=\"schema-faq-question\"><strong>How do I clear SPN 3031 FMI 16?<\/strong><\/strong> <p class=\"schema-faq-answer\">Identify and fix the heat source \u2014 check the DEF tank heater, cooling lines, and temperature sensor. Once the tank temperature returns to the acceptable range and the sensor confirms normal readings the code should clear.<\/p> <\/div> <\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Related codes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/\" type=\"link\" id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/\">SPN 3031 FMI 1 <\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3509-fmi-16-def-concentration-out-of-range\/\" type=\"link\" id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3509-fmi-16-def-concentration-out-of-range\/\">SPN 3509 FMI 16 <\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3364-fmi-2\/\" type=\"link\" id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3364-fmi-2\/\">SPN 3364 FMI 2 <\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3936-fmi-1-def-level-low\/\" type=\"link\" id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3936-fmi-1-def-level-low\/\">SPN 3936 FMI 1<\/a><\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">Need Immediate Help With This Fault Code?<\/h2>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">If your engine is derating, losing power, or unable to complete regeneration, don\u2019t risk further damage or costly downtime.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use 4RoadService to locate mobile truck repair, dealer diagnostics, or emergency roadside assistance near your location.<\/p>\n\n\n\n<div class=\"wp-block-buttons has-off-white-background-color has-background is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.4roadservice.com\/truck-dealers\">Find Truck Repair Near Me<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-text-align-center wp-element-button\" href=\"https:\/\/www.4roadservice.com\/truck-repair\">Find Mobile Road Service<\/a><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Important Notice<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The information provided above is for general informational purposes only and should not replace official OEM service procedures. Always consult the manufacturer\u2019s service manual or a qualified diesel technician before performing repairs. Operating a vehicle with active fault codes may result in further damage.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u2190 Back to Detroit Diesel Fault Codes Detroit Diesel SPN 3031 FMI 16 indicates that the DEF tank temperature has risen above the acceptable operating range. This code appears on DD13, DD15, and DD16 engines and is important to address promptly as excessive heat can degrade DEF fluid quality, damage the DEF tank and components, &hellip; <a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Detroit Diesel SPN 3031 FMI 16 \u2013 DEF Tank Temperature High (Meaning, Causes &amp; Fix)<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-855","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SPN 3031 FMI 16 - DEF Tank Temperature High<\/title>\n<meta name=\"description\" content=\"Detroit Diesel SPN 3031 FMI 16 means DEF tank temperature is too high. Learn symptoms, causes, derate risk and how to fix it.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SPN 3031 FMI 16 - DEF Tank Temperature High\" \/>\n<meta property=\"og:description\" content=\"Detroit Diesel SPN 3031 FMI 16 means DEF tank temperature is too high. Learn symptoms, causes, derate risk and how to fix it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/\" \/>\n<meta property=\"og:site_name\" content=\"4RoadService Resources\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/4roadservice\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-15T19:15:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.4roadservice.com\/resources\/wp-content\/uploads\/2015\/08\/logo-sidebar@2x.png\" \/>\n\t<meta property=\"og:image:width\" content=\"380\" \/>\n\t<meta property=\"og:image:height\" content=\"64\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@4RoadService\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/\",\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/\",\"name\":\"SPN 3031 FMI 16 - DEF Tank Temperature High\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/#website\"},\"datePublished\":\"2026-03-15T19:15:45+00:00\",\"dateModified\":\"2026-03-15T19:15:48+00:00\",\"description\":\"Detroit Diesel SPN 3031 FMI 16 means DEF tank temperature is too high. Learn symptoms, causes, derate risk and how to fix it.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#breadcrumb\"},\"mainEntity\":[{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601924855\"},{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601927252\"},{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926860\"},{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926524\"},{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926116\"}],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Detroit Diesel SPN 3031 FMI 16 \u2013 DEF Tank Temperature High (Meaning, Causes &amp; Fix)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/#website\",\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/\",\"name\":\"4RoadService Resources\",\"description\":\"Tools, Repairs &amp; Resources for Truck Drivers\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/#organization\",\"name\":\"4RoadService.com\",\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/blog.4roadservice.com\\\/wp-content\\\/uploads\\\/2015\\\/08\\\/logo-sidebar@2x.png\",\"contentUrl\":\"https:\\\/\\\/blog.4roadservice.com\\\/wp-content\\\/uploads\\\/2015\\\/08\\\/logo-sidebar@2x.png\",\"width\":380,\"height\":64,\"caption\":\"4RoadService.com\"},\"image\":{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/4roadservice\",\"https:\\\/\\\/x.com\\\/4RoadService\"]},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601924855\",\"position\":1,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601924855\",\"name\":\"What does Detroit Diesel SPN 3031 FMI 16 mean?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It means the DEF tank temperature has risen above the acceptable operating range, which can degrade DEF fluid quality and affect SCR system performance.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601927252\",\"position\":2,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601927252\",\"name\":\"What causes SPN 3031 FMI 16?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The most common causes are a DEF tank heater stuck on, a failed cooling system for the DEF tank, excessive heat from nearby exhaust components, or a faulty DEF temperature sensor.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926860\",\"position\":3,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926860\",\"name\":\"Can I keep driving with SPN 3031 FMI 16?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Short distances may be possible but continued operation with high DEF tank temperature risks degrading the fluid and damaging dosing components, which can lead to further faults and derate.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926524\",\"position\":4,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926524\",\"name\":\"Will SPN 3031 FMI 16 cause a derate?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It can if the high temperature condition degrades DEF quality to the point where the SCR system can no longer meet emissions thresholds.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926116\",\"position\":5,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\\\/#faq-question-1773601926116\",\"name\":\"How do I clear SPN 3031 FMI 16?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Identify and fix the heat source \u2014 check the DEF tank heater, cooling lines, and temperature sensor. Once the tank temperature returns to the acceptable range and the sensor confirms normal readings the code should clear.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"SPN 3031 FMI 16 - DEF Tank Temperature High","description":"Detroit Diesel SPN 3031 FMI 16 means DEF tank temperature is too high. Learn symptoms, causes, derate risk and how to fix it.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/","og_locale":"en_US","og_type":"article","og_title":"SPN 3031 FMI 16 - DEF Tank Temperature High","og_description":"Detroit Diesel SPN 3031 FMI 16 means DEF tank temperature is too high. Learn symptoms, causes, derate risk and how to fix it.","og_url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/","og_site_name":"4RoadService Resources","article_publisher":"https:\/\/www.facebook.com\/4roadservice","article_modified_time":"2026-03-15T19:15:48+00:00","og_image":[{"width":380,"height":64,"url":"https:\/\/www.4roadservice.com\/resources\/wp-content\/uploads\/2015\/08\/logo-sidebar@2x.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_site":"@4RoadService","twitter_misc":{"Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":["WebPage","FAQPage"],"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/","url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/","name":"SPN 3031 FMI 16 - DEF Tank Temperature High","isPartOf":{"@id":"https:\/\/www.4roadservice.com\/resources\/#website"},"datePublished":"2026-03-15T19:15:45+00:00","dateModified":"2026-03-15T19:15:48+00:00","description":"Detroit Diesel SPN 3031 FMI 16 means DEF tank temperature is too high. Learn symptoms, causes, derate risk and how to fix it.","breadcrumb":{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#breadcrumb"},"mainEntity":[{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601924855"},{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601927252"},{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926860"},{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926524"},{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926116"}],"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.4roadservice.com\/resources\/"},{"@type":"ListItem","position":2,"name":"Detroit Diesel SPN 3031 FMI 16 \u2013 DEF Tank Temperature High (Meaning, Causes &amp; Fix)"}]},{"@type":"WebSite","@id":"https:\/\/www.4roadservice.com\/resources\/#website","url":"https:\/\/www.4roadservice.com\/resources\/","name":"4RoadService Resources","description":"Tools, Repairs &amp; Resources for Truck Drivers","publisher":{"@id":"https:\/\/www.4roadservice.com\/resources\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.4roadservice.com\/resources\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.4roadservice.com\/resources\/#organization","name":"4RoadService.com","url":"https:\/\/www.4roadservice.com\/resources\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.4roadservice.com\/resources\/#\/schema\/logo\/image\/","url":"https:\/\/blog.4roadservice.com\/wp-content\/uploads\/2015\/08\/logo-sidebar@2x.png","contentUrl":"https:\/\/blog.4roadservice.com\/wp-content\/uploads\/2015\/08\/logo-sidebar@2x.png","width":380,"height":64,"caption":"4RoadService.com"},"image":{"@id":"https:\/\/www.4roadservice.com\/resources\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/4roadservice","https:\/\/x.com\/4RoadService"]},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601924855","position":1,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601924855","name":"What does Detroit Diesel SPN 3031 FMI 16 mean?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"It means the DEF tank temperature has risen above the acceptable operating range, which can degrade DEF fluid quality and affect SCR system performance.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601927252","position":2,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601927252","name":"What causes SPN 3031 FMI 16?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The most common causes are a DEF tank heater stuck on, a failed cooling system for the DEF tank, excessive heat from nearby exhaust components, or a faulty DEF temperature sensor.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926860","position":3,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926860","name":"Can I keep driving with SPN 3031 FMI 16?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Short distances may be possible but continued operation with high DEF tank temperature risks degrading the fluid and damaging dosing components, which can lead to further faults and derate.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926524","position":4,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926524","name":"Will SPN 3031 FMI 16 cause a derate?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"It can if the high temperature condition degrades DEF quality to the point where the SCR system can no longer meet emissions thresholds.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926116","position":5,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-16-def-tank-temperature-high\/#faq-question-1773601926116","name":"How do I clear SPN 3031 FMI 16?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Identify and fix the heat source \u2014 check the DEF tank heater, cooling lines, and temperature sensor. Once the tank temperature returns to the acceptable range and the sensor confirms normal readings the code should clear.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P6wicq-dN","_links":{"self":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/comments?post=855"}],"version-history":[{"count":4,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/855\/revisions"}],"predecessor-version":[{"id":861,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/855\/revisions\/861"}],"wp:attachment":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/media?parent=855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}