{"id":766,"date":"2026-03-15T12:02:39","date_gmt":"2026-03-15T16:02:39","guid":{"rendered":"https:\/\/www.4roadservice.com\/resources\/?page_id=766"},"modified":"2026-03-15T12:04:10","modified_gmt":"2026-03-15T16:04:10","slug":"detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low","status":"publish","type":"page","link":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/","title":{"rendered":"Detroit Diesel SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low (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 1 indicates that the Diesel Exhaust Fluid (DEF) tank temperature has dropped below the acceptable operating range. This code is most commonly seen on DD13, DD15, and DD16 engines during cold weather operation and can affect DEF flow and 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 system warning light illuminated <\/li>\n\n\n\n<li>Reduced SCR system performance <\/li>\n\n\n\n<li>Possible engine derate in severe cases<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Cause<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DEF freezes at 12\u00b0F (-11\u00b0C). This code triggers when the DEF tank temperature sensor detects fluid that is too cold to flow properly through the dosing system. Common causes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Extreme cold weather operation <\/li>\n\n\n\n<li>Faulty DEF tank heater <\/li>\n\n\n\n<li>Failed DEF temperature sensor <\/li>\n\n\n\n<li>Broken or disconnected heater wiring<\/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 if the DEF system cannot supply fluid to the SCR system due to frozen or cold DEF, a derate condition can follow. In very cold conditions address this before operating the vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Action<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Allow the vehicle to warm up so the DEF tank heater can bring fluid to operating temperature. If the code persists in normal temperatures, inspect the DEF tank heater, temperature sensor, and associated wiring for faults.<\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1773590251918\"><strong class=\"schema-faq-question\"><strong>What does Detroit Diesel SPN 3031 FMI 1 mean?<\/strong><\/strong> <p class=\"schema-faq-answer\">It means the DEF tank temperature has dropped below the minimum operating threshold, which can prevent proper DEF flow to the SCR system.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773590257499\"><strong class=\"schema-faq-question\">What causes SPN 3031 FMI 1?<\/strong> <p class=\"schema-faq-answer\">Most commonly cold weather causing DEF to freeze or become too cold to flow. It can also be caused by a failed DEF tank heater or a faulty temperature sensor.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773590255387\"><strong class=\"schema-faq-question\"><strong>Can I keep driving with SPN 3031 FMI 1?<\/strong><\/strong> <p class=\"schema-faq-answer\">Limited driving may be possible but if the DEF system cannot function properly due to temperature, a derate condition may follow.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773590254907\"><strong class=\"schema-faq-question\">Will SPN 3031 FMI 1 cause a derate?<\/strong> <p class=\"schema-faq-answer\">It can if the SCR system is unable to dose DEF properly as a result of the low temperature condition.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773590254403\"><strong class=\"schema-faq-question\">How do I clear SPN 3031 FMI 1?<\/strong> <p class=\"schema-faq-answer\">Allow the vehicle to warm up fully. If the code clears once the DEF reaches operating temperature, no further action is needed. If it persists, inspect the DEF heater system and temperature sensor.<\/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-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\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-520372-fmi-16\/\" type=\"link\" id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-520372-fmi-16\/\">SPN 520372 FMI 16<\/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 1 indicates that the Diesel Exhaust Fluid (DEF) tank temperature has dropped below the acceptable operating range. This code is most commonly seen on DD13, DD15, and DD16 engines during cold weather operation and can affect DEF flow and SCR system performance. Symptoms &hellip; <a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Detroit Diesel SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low (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-766","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 1 \u2013 DEF Tank Temperature Low<\/title>\n<meta name=\"description\" content=\"Detroit Diesel SPN 3031 FMI 1 means your DEF tank temperature is too low. Learn symptoms, causes, derate risk and how to fix it on DD13, DD15 and DD16 engines.\" \/>\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-1-def-tank-temperature-low\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low\" \/>\n<meta property=\"og:description\" content=\"Detroit Diesel SPN 3031 FMI 1 means your DEF tank temperature is too low. Learn symptoms, causes, derate risk and how to fix it on DD13, DD15 and DD16 engines.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/\" \/>\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=\"2026-03-15T16:04:10+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-1-def-tank-temperature-low\\\/\",\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/\",\"name\":\"SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/#website\"},\"datePublished\":\"2026-03-15T16:02:39+00:00\",\"dateModified\":\"2026-03-15T16:04:10+00:00\",\"description\":\"Detroit Diesel SPN 3031 FMI 1 means your DEF tank temperature is too low. Learn symptoms, causes, derate risk and how to fix it on DD13, DD15 and DD16 engines.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#breadcrumb\"},\"mainEntity\":[{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590251918\"},{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590257499\"},{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590255387\"},{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590254907\"},{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590254403\"}],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Detroit Diesel SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low (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-1-def-tank-temperature-low\\\/#faq-question-1773590251918\",\"position\":1,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590251918\",\"name\":\"What does Detroit Diesel SPN 3031 FMI 1 mean?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It means the DEF tank temperature has dropped below the minimum operating threshold, which can prevent proper DEF flow to the SCR system.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590257499\",\"position\":2,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590257499\",\"name\":\"What causes SPN 3031 FMI 1?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most commonly cold weather causing DEF to freeze or become too cold to flow. It can also be caused by a failed DEF tank heater or a faulty temperature sensor.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590255387\",\"position\":3,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590255387\",\"name\":\"Can I keep driving with SPN 3031 FMI 1?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Limited driving may be possible but if the DEF system cannot function properly due to temperature, a derate condition may follow.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590254907\",\"position\":4,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590254907\",\"name\":\"Will SPN 3031 FMI 1 cause a derate?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It can if the SCR system is unable to dose DEF properly as a result of the low temperature condition.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590254403\",\"position\":5,\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\\\/#faq-question-1773590254403\",\"name\":\"How do I clear SPN 3031 FMI 1?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Allow the vehicle to warm up fully. If the code clears once the DEF reaches operating temperature, no further action is needed. If it persists, inspect the DEF heater system and temperature sensor.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low","description":"Detroit Diesel SPN 3031 FMI 1 means your DEF tank temperature is too low. Learn symptoms, causes, derate risk and how to fix it on DD13, DD15 and DD16 engines.","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-1-def-tank-temperature-low\/","og_locale":"en_US","og_type":"article","og_title":"SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low","og_description":"Detroit Diesel SPN 3031 FMI 1 means your DEF tank temperature is too low. Learn symptoms, causes, derate risk and how to fix it on DD13, DD15 and DD16 engines.","og_url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/","og_site_name":"4RoadService Resources","article_publisher":"https:\/\/www.facebook.com\/4roadservice","article_modified_time":"2026-03-15T16:04:10+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-1-def-tank-temperature-low\/","url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/","name":"SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low","isPartOf":{"@id":"https:\/\/www.4roadservice.com\/resources\/#website"},"datePublished":"2026-03-15T16:02:39+00:00","dateModified":"2026-03-15T16:04:10+00:00","description":"Detroit Diesel SPN 3031 FMI 1 means your DEF tank temperature is too low. Learn symptoms, causes, derate risk and how to fix it on DD13, DD15 and DD16 engines.","breadcrumb":{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#breadcrumb"},"mainEntity":[{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590251918"},{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590257499"},{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590255387"},{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590254907"},{"@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590254403"}],"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.4roadservice.com\/resources\/"},{"@type":"ListItem","position":2,"name":"Detroit Diesel SPN 3031 FMI 1 \u2013 DEF Tank Temperature Low (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-1-def-tank-temperature-low\/#faq-question-1773590251918","position":1,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590251918","name":"What does Detroit Diesel SPN 3031 FMI 1 mean?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"It means the DEF tank temperature has dropped below the minimum operating threshold, which can prevent proper DEF flow to the SCR system.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590257499","position":2,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590257499","name":"What causes SPN 3031 FMI 1?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Most commonly cold weather causing DEF to freeze or become too cold to flow. It can also be caused by a failed DEF tank heater or a faulty temperature sensor.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590255387","position":3,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590255387","name":"Can I keep driving with SPN 3031 FMI 1?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Limited driving may be possible but if the DEF system cannot function properly due to temperature, a derate condition may follow.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590254907","position":4,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590254907","name":"Will SPN 3031 FMI 1 cause a derate?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"It can if the SCR system is unable to dose DEF properly as a result of the low temperature condition.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590254403","position":5,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3031-fmi-1-def-tank-temperature-low\/#faq-question-1773590254403","name":"How do I clear SPN 3031 FMI 1?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Allow the vehicle to warm up fully. If the code clears once the DEF reaches operating temperature, no further action is needed. If it persists, inspect the DEF heater system and temperature sensor.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P6wicq-cm","_links":{"self":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/766","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=766"}],"version-history":[{"count":2,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/766\/revisions"}],"predecessor-version":[{"id":768,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/766\/revisions\/768"}],"wp:attachment":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/media?parent=766"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}