{"id":571,"date":"2026-02-21T15:24:46","date_gmt":"2026-02-21T20:24:46","guid":{"rendered":"https:\/\/www.4roadservice.com\/resources\/?page_id=571"},"modified":"2026-02-22T21:30:54","modified_gmt":"2026-02-23T02:30:54","slug":"detroit-diesel-spn-3364-fmi-2","status":"publish","type":"page","link":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3364-fmi-2\/","title":{"rendered":"Detroit Diesel SPN 3364 FMI 2 \u2013 DEF Quality \/ Sensor Fault"},"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 3364 FMI 2 indicates a Diesel Exhaust Fluid (DEF) quality or sensor fault. This code commonly appears when the DEF concentration is incorrect or when the DEF sensor is malfunctioning.<\/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 illuminated<\/li>\n\n\n\n<li>DEF warning message<\/li>\n\n\n\n<li>Engine derate countdown<\/li>\n\n\n\n<li>Reduced power<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Cause<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This fault is typically triggered by contaminated DEF, incorrect DEF concentration, failed DEF quality sensor, or wiring issues within the aftertreatment system.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Can You Keep Driving?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Driving may be possible temporarily, but continued operation can lead to progressive derate and eventual speed limitation if not addressed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Action<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect DEF quality and ensure correct fluid concentration. Replace contaminated DEF if necessary. If the issue persists, perform diagnostic testing on the DEF sensor and wiring.<\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1771788804128\"><strong class=\"schema-faq-question\">What causes SPN 3364 FMI 2?<\/strong> <p class=\"schema-faq-answer\">Common causes include contaminated DEF fluid, incorrect DEF concentration, sensor failure, wiring issues, or crystallization buildup in the DEF tank.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771788805728\"><strong class=\"schema-faq-question\">What does Detroit Diesel SPN 3364 FMI 2 mean?<\/strong> <p class=\"schema-faq-answer\">SPN 3364 FMI 2 indicates that the Diesel Exhaust Fluid (DEF) quality sensor is reporting an out-of-range or erratic signal.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771788806768\"><strong class=\"schema-faq-question\">Can I keep driving with SPN 3364 FMI 2?<\/strong> <p class=\"schema-faq-answer\">Driving may be possible temporarily, but unresolved DEF quality faults can trigger progressive engine derate.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771788808010\"><strong class=\"schema-faq-question\">Will SPN 3364 FMI 2 cause a speed limit?<\/strong> <p class=\"schema-faq-answer\">Yes. If the DEF issue is not corrected, the engine control module may limit vehicle speed to comply with emissions regulations.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771788809065\"><strong class=\"schema-faq-question\">How do I fix SPN 3364 FMI 2?<\/strong> <p class=\"schema-faq-answer\">How do I fix SPN 3364 FMI 2?<\/p> <\/div> <\/div>\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\">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\">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 3364 FMI 2 indicates a Diesel Exhaust Fluid (DEF) quality or sensor fault. This code commonly appears when the DEF concentration is incorrect or when the DEF sensor is malfunctioning. Symptoms Cause This fault is typically triggered by contaminated DEF, incorrect DEF concentration, failed DEF &hellip; <a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-3364-fmi-2\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Detroit Diesel SPN 3364 FMI 2 \u2013 DEF Quality \/ Sensor Fault<\/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-571","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>Detroit Diesel SPN 3364 FMI 2 \u2013 DEF Quality \/ Sensor Fault (Meaning &amp; Fix)<\/title>\n<meta name=\"description\" content=\"Detroit Diesel SPN 3719 FMI 0 indicates high DPF soot load requiring regeneration. Learn symptoms, causes, and how to fix it fast.\" \/>\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-3364-fmi-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Detroit Diesel SPN 3364 FMI 2 \u2013 DEF Quality \/ Sensor Fault (Meaning &amp; Fix)\" \/>\n<meta property=\"og:description\" content=\"Detroit Diesel SPN 3719 FMI 0 indicates high DPF soot load requiring regeneration. 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