{"id":1027,"date":"2026-08-01T14:58:49","date_gmt":"2026-08-01T18:58:49","guid":{"rendered":"https:\/\/www.4roadservice.com\/resources\/?page_id=1027"},"modified":"2026-08-01T15:16:08","modified_gmt":"2026-08-01T19:16:08","slug":"detroit-diesel-spn-27-fmi-9-egr-valve-position-error","status":"publish","type":"page","link":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-9-egr-valve-position-error\/","title":{"rendered":"Detroit Diesel SPN 27 FMI 9 \u2013 EGR Valve Position Error (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 27 FMI 9 indicates that the EGR valve position is not matching the commanded position from the ECM. This code appears on DD13, DD15, and DD16 engines and means the exhaust gas recirculation system is not responding correctly, which can affect emissions control, engine performance, and combustion efficiency.<\/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>EGR or emissions warning light illuminated <\/li>\n\n\n\n<li>Rough idle or unstable engine operation <\/li>\n\n\n\n<li>Reduced engine performance Engine derate possible Increased <\/li>\n\n\n\n<li>NOx emissions <\/li>\n\n\n\n<li>Black smoke from exhaust possible<\/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 ECM detects a discrepancy between the commanded EGR valve position and the actual position reported by the valve sensor. Common causes include:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Excessive carbon deposits in the EGR system<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Carbon buildup on the EGR valve preventing proper movement<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Stuck or seized EGR valve<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failed EGR valve position sensor<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Damaged EGR valve actuator motor<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wiring or connector fault at the EGR valve<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">EGR cooler restriction affecting valve operation<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Can You Keep Driving?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Limited driving may be possible but an EGR valve position error affects combustion efficiency and emissions control. Engine performance will be impacted and a derate condition may follow if the fault persists. Address this promptly to avoid further carbon buildup or component damage.<\/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 for carbon buildup and clean if necessary. Check the valve actuator and position sensor for proper operation. Inspect wiring and connectors at the EGR valve for damage or corrosion. If cleaning does not resolve the issue the EGR valve assembly may need to be replaced.<\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1771789499992\"><strong class=\"schema-faq-question\"><strong>What does Detroit Diesel SPN 27 FMI 9 mean?<\/strong><\/strong> <p class=\"schema-faq-answer\"><br>It means the EGR valve is not moving to the position commanded by the ECM, indicating a mechanical, electrical, or carbon buildup issue with the valve or its control system.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785610294962\"><strong class=\"schema-faq-question\">What causes SPN 27 FMI 9?<\/strong> <p class=\"schema-faq-answer\">The most common causes are carbon buildup preventing valve movement, a stuck or seized EGR valve, a failed position sensor, or a wiring fault at the valve connector.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785610314410\"><strong class=\"schema-faq-question\">Can I keep driving with SPN 27 FMI 9?<\/strong> <p class=\"schema-faq-answer\">Short distances may be possible but EGR valve position errors affect combustion and emissions control. A derate condition may follow if not addressed promptly.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785610333857\"><strong class=\"schema-faq-question\">Will SPN 27 FMI 9 cause a derate?<\/strong> <p class=\"schema-faq-answer\">Yes. If the ECM cannot control EGR valve position correctly it will trigger derate conditions to limit emissions and protect the engine.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785610356713\"><strong class=\"schema-faq-question\">How do I clear SPN 27 FMI 9?<\/strong> <p class=\"schema-faq-answer\">Clean or replace the EGR valve and inspect the position sensor and wiring. Once the valve responds correctly to ECM commands and position feedback matches commanded values 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-2659-fmi-0\/\" data-type=\"link\" data-id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-2659-fmi-0\/\">SPN 2659 FMI 0 <\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-4364-fmi-18\/\" data-type=\"link\" data-id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-4364-fmi-18\/\">SPN 4364 FMI 18 <\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-11-egr-valve-circuit-fault\/\" data-type=\"link\" data-id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-11-egr-valve-circuit-fault\/\">SPN 27 FMI 11<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-4360-fmi-18-aftertreatment-scr-inducement-active\/\" data-type=\"link\" data-id=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-4360-fmi-18-aftertreatment-scr-inducement-active\/\">SPN 4360 FMI 18<\/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 27 FMI 9 indicates that the EGR valve position is not matching the commanded position from the ECM. This code appears on DD13, DD15, and DD16 engines and means the exhaust gas recirculation system is not responding correctly, which can affect emissions control, engine performance, &hellip; <a href=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-9-egr-valve-position-error\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Detroit Diesel SPN 27 FMI 9 \u2013 EGR Valve Position Error (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-1027","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 100 FMI 1 \u2013 Engine Oil Pressure Low<\/title>\n<meta name=\"description\" content=\"Detroit Diesel SPN 100 FMI 1 means engine oil pressure low. 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Learn common causes, symptoms, and repair steps for DD13, DD15, and DD16 engines.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-9-egr-valve-position-error\/\" \/>\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=\"2026-08-01T19:16:08+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-27-fmi-9-egr-valve-position-error\\\/\",\"url\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/detroit-diesel-spn-27-fmi-9-egr-valve-position-error\\\/\",\"name\":\"Detroit Diesel SPN 100 FMI 1 \u2013 Engine Oil Pressure Low\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.4roadservice.com\\\/resources\\\/#website\"},\"datePublished\":\"2026-08-01T18:58:49+00:00\",\"dateModified\":\"2026-08-01T19:16:08+00:00\",\"description\":\"Detroit Diesel SPN 100 FMI 1 means engine oil pressure low. 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A derate condition may follow if not addressed promptly.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-9-egr-valve-position-error\/#faq-question-1785610333857","position":4,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-9-egr-valve-position-error\/#faq-question-1785610333857","name":"Will SPN 27 FMI 9 cause a derate?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. If the ECM cannot control EGR valve position correctly it will trigger derate conditions to limit emissions and protect the engine.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-9-egr-valve-position-error\/#faq-question-1785610356713","position":5,"url":"https:\/\/www.4roadservice.com\/resources\/detroit-diesel-spn-27-fmi-9-egr-valve-position-error\/#faq-question-1785610356713","name":"How do I clear SPN 27 FMI 9?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Clean or replace the EGR valve and inspect the position sensor and wiring. Once the valve responds correctly to ECM commands and position feedback matches commanded values the code should clear.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P6wicq-gz","_links":{"self":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/1027","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=1027"}],"version-history":[{"count":2,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/1027\/revisions"}],"predecessor-version":[{"id":1036,"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/pages\/1027\/revisions\/1036"}],"wp:attachment":[{"href":"https:\/\/www.4roadservice.com\/resources\/wp-json\/wp\/v2\/media?parent=1027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}