{"id":604,"date":"2026-02-22T11:50:18","date_gmt":"2026-02-22T16:50:18","guid":{"rendered":"https:\/\/www.4roadservice.com\/resources\/?page_id=604"},"modified":"2026-02-22T21:33:27","modified_gmt":"2026-02-23T02:33:27","slug":"detroit-diesel-spn-4364-fmi-18","status":"publish","type":"page","link":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-4364-fmi-18\/","title":{"rendered":"Detroit Diesel SPN 4364 FMI 18 \u2013 EGR Flow Fault (Meaning &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 4364 FMI 18 indicates an issue with Exhaust Gas Recirculation (EGR) flow. This code appears when the EGR system is not operating within expected parameters and can contribute to emissions system faults.<\/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>Rough idle<\/li>\n\n\n\n<li>Reduced fuel efficiency<\/li>\n\n\n\n<li>Increased exhaust smoke<\/li>\n\n\n\n<li>Possible aftertreatment warnings<\/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 commonly triggered by a stuck EGR valve, clogged EGR cooler, faulty EGR differential pressure sensor, or restricted exhaust passages.<\/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 unresolved EGR flow issues can lead to additional emissions faults and eventual engine derate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Action<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect the EGR valve and cooler for blockage or failure. Verify proper sensor readings and clean or replace faulty components as needed.<\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1771790282265\"><strong class=\"schema-faq-question\">What does Detroit Diesel SPN 4364 FMI 18 mean?<\/strong> <p class=\"schema-faq-answer\">SPN 4364 FMI 18 indicates that Exhaust Gas Recirculation (EGR) flow is outside the expected operating range.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771790284250\"><strong class=\"schema-faq-question\">What causes SPN 4364 FMI 18?<\/strong> <p class=\"schema-faq-answer\">Common causes include a stuck EGR valve, clogged EGR cooler, faulty differential pressure sensor, or restricted exhaust passages.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771790285034\"><strong class=\"schema-faq-question\">Can I keep driving with SPN 4364 FMI 18?<\/strong> <p class=\"schema-faq-answer\">Driving may be possible temporarily, but unresolved EGR faults can contribute to emissions issues and engine derate.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771790285729\"><strong class=\"schema-faq-question\">Will SPN 4364 FMI 18 cause a derate?<\/strong> <p class=\"schema-faq-answer\">Yes. If EGR flow remains incorrect, the engine control module may reduce power to protect emissions components.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771790286937\"><strong class=\"schema-faq-question\">How do I fix SPN 4364 FMI 18?<\/strong> <p class=\"schema-faq-answer\">Inspect and clean the EGR valve and cooler, test related sensors, and verify proper exhaust flow before clearing the code.<\/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-520372-fmi-16\/\">SPN 520372 (SCR)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/Detroit_Diesel_Engine_Fault_Codes\/spn-3719-fmi-0\/\">SPN 3719 (DPF)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-5246-fmi-0\/\">SPN 5246 (Aftertreatment)<\/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\">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 4364 FMI 18 indicates an issue with Exhaust Gas Recirculation (EGR) flow. This code appears when the EGR system is not operating within expected parameters and can contribute to emissions system faults. Symptoms Cause This fault is commonly triggered by a stuck EGR valve, clogged &hellip; <a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-4364-fmi-18\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Detroit Diesel SPN 4364 FMI 18 \u2013 EGR Flow Fault (Meaning &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-604","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 4364 FMI 18 \u2013 EGR Flow Fault Fix<\/title>\n<meta name=\"description\" content=\"Detroit Diesel SPN 4364 FMI 18 indicates an EGR flow issue. 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If EGR flow remains incorrect, the engine control module may reduce power to protect emissions components.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-4364-fmi-18\/#faq-question-1771790286937","position":5,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-4364-fmi-18\/#faq-question-1771790286937","name":"How do I fix SPN 4364 FMI 18?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Inspect and clean the EGR valve and cooler, test related sensors, and verify proper exhaust flow before clearing the code.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P6wicq-9K","_links":{"self":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/604","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=604"}],"version-history":[{"count":6,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/604\/revisions"}],"predecessor-version":[{"id":724,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/604\/revisions\/724"}],"wp:attachment":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/media?parent=604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}