{"id":75532,"date":"2022-10-17T22:27:21","date_gmt":"2022-10-18T05:27:21","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=75532"},"modified":"2024-05-13T16:50:44","modified_gmt":"2024-05-13T23:50:44","slug":"p0179-code-fuel-composition-sensor-high-input","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0179-code-fuel-composition-sensor-high-input\/","title":{"rendered":"P0179 Code: Fuel Composition Sensor High Input"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_2be7bd-8d > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_2be7bd-8d > .kt-inside-inner-col,.kadence-column_2be7bd-8d > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_2be7bd-8d > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_2be7bd-8d > .kt-inside-inner-col{flex-direction:column;}.kadence-column_2be7bd-8d > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_2be7bd-8d > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_2be7bd-8d{position:relative;}@media all and (max-width: 1024px){.kadence-column_2be7bd-8d > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_2be7bd-8d > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_2be7bd-8d qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-0b20ae  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-6156a9\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_6422a7-0d, .wp-block-kadence-advancedheading.kt-adv-heading_6422a7-0d[data-kb-block=\"kb-adv-heading_6422a7-0d\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_6422a7-0d mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_6422a7-0d[data-kb-block=\"kb-adv-heading_6422a7-0d\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_6422a7-0d img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_6422a7-0d[data-kb-block=\"kb-adv-heading_6422a7-0d\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_6422a7-0d summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_6422a7-0d\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P0179 code stands for &ldquo;Fuel Composition Sensor High Input.&rdquo;<\/li><li>This code is set when the PCM detects a high-voltage input coming from the fuel composition sensor circuit.<\/li><li>Some potential causes include a failed fuel composition sensor or a malfunctioning PCM.<\/li><li>Symptoms to look out for include an illuminated check engine light, reduced engine performance, poor fuel economy, and ignition trouble.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>In order for the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> (PCM) to identify the fuel composition and modify the fuel distribution, vehicles that can run on varying percentages of ethanol (Flex Fuel, E85) have a fuel composition sensor in the fuel system.<\/p>\n\n\n\n<p>P0179 is a generic trouble code related to a fault in your fuel composition sensor or its circuit. Know more about it through this article.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0179 Code Mean?<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Diagnostic trouble code\">Diagnostic trouble code<\/a> (DTC) P0179 stands for &ldquo;Fuel Composition Sensor High Input.&rdquo; The code is set once the PCM detects a high-voltage input coming from the fuel composition sensor circuit.<\/p>\n\n\n\n<p>Some vehicles are equipped with a <a href=\"https:\/\/www.carparts.com\/flex-fuel-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel composition sensor\">fuel composition sensor<\/a>. This sensor keeps track of the amount of ethanol in the gasoline inside a flex-fuel engine. Every time you fill up the tank, the amount of ethanol can change, requiring proper changes for the best performance and fuel efficiency.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-composition-sensor-or-flex-fuel-sensor-featured-1024x602.jpg\" alt=\"fuel composition sensor or flex fuel sensor featured\" class=\"wp-image-76229\" width=\"1024\" height=\"602\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-composition-sensor-or-flex-fuel-sensor-featured-1024x602.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-composition-sensor-or-flex-fuel-sensor-featured-300x176.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-composition-sensor-or-flex-fuel-sensor-featured-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-composition-sensor-or-flex-fuel-sensor-featured-1536x904.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-composition-sensor-or-flex-fuel-sensor-featured-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/fuel-composition-sensor-or-flex-fuel-sensor-featured.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Some vehicles are equipped with a fuel composition sensor. This sensor keeps track of the amount of ethanol in the gasoline inside a flex-fuel engine.<\/figcaption><\/figure>\n\n\n\n<p>Depending on the level of ethanol, the fuel composition sensor circuit provides a signal to the PCM. To burn the fuel more effectively, the PCM modifies the fuel injector pulse width and ignition timing as necessary.<\/p>\n\n\n\n<p>Code P0179 is set once the PCM detects a voltage signal that&rsquo;s way above factory specifications. This code is usually indicative of an electrical circuit issue.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0179 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Causes of the P0179 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Fuel composition sensor malfunction<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Bad PCM\">Bad PCM<\/a><\/li><li>Outdated PCM software<\/li><li>Wiring problems<\/li><\/ul>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Symptoms of the P0179 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Illuminated check engine light\">Illuminated check engine light<\/a><\/li><li>Poor engine performance<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Difficulty starting engine\">Difficulty starting engine<\/a><\/li><li>Decreased fuel economy<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0179 Code<\/h2>\n\n\n\n<p>DTC P0179&nbsp; is a generic powertrain code that can be logged across different makes and models. However, that doesn&rsquo;t mean there is only one way to diagnose and clear this trouble code. Luckily, you can always have a certified mechanic do the job for you.<\/p>\n\n\n\n<p>Here is a video of what the diagnostic procedure for this code might involve:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"02 Chevy Tahoe\/GMC Yukon Hard Start P0172, P0175, P0179 Diag Repair\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/LDpPOxe9gTA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0179 Code<\/h2>\n\n\n\n<p>Attempting to fix a DTC P0179 code isn&rsquo;t easy. If you don&rsquo;t have enough technical know-how to get the job done, you might just end up causing more issues. If you&rsquo;re not sure about anything, it&rsquo;s best to have the problem fixed by a trained professional to ensure that all steps and protocols are followed properly.<\/p>\n\n\n\n<p>But if you think you can handle the problem on your own, make sure you have the right information before proceeding. Remember that there is no one-size-fits-all solution that works on all makes and models. Before you start, you might want to look into Chilton guides or an ALLDATA membership to get vehicle-specific repair information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Shop for a New Fuel Composition Sensor<\/h2>\n\n\n\n<p>The symptoms related to a logged P0179 code may be troublesome to deal with as most of them cause issues with the engine. Thankfully, one of the ways to clear it is by replacing a faulty <a href=\"https:\/\/www.carparts.com\/flex-fuel-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel composition sensor\">fuel composition sensor<\/a>.<\/p>\n\n\n\n<p>Get a high-quality replacement by shopping at <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>!<\/p>\n\n\n\n<p>Use our vehicle selector to input your ride&rsquo;s year, make, and model to browse compatible sensors. Further enhance your shopping experience by using our search filters to shop based on your preferred brands or price range.<\/p>\n\n\n\n<p>Our customer support is also available 24\/7 to assist you with any concerns you may have.<\/p>\n\n\n\n<p>We have warehouses scattered across the country, so you can expect your package to be packed and shipped in no time. Place your order before noon ET and receive in as fast two business days.<\/p>\n\n\n\n<p>Visit our website today to get the best deals on the market!<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>In order for the powertrain control module (PCM) to identify the fuel composition and modify the fuel distribution, vehicles that&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0179-code-fuel-composition-sensor-high-input\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":76228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[1314],"tags":[1323,3185],"ppma_author":[2607,2855],"class_list":{"0":"post-75532","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-engine-control-module-2","9":"tag-flex-fuel-sensor","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0179 Code: Fuel Composition Sensor High Input - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Read on to find out what a P0179 code means and what could happen to your vehicle if this code is set.\" \/>\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.carparts.com\/blog\/p0179-code-fuel-composition-sensor-high-input\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0179 Code: Fuel Composition Sensor High Input - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Read on to find out what a P0179 code means and what could happen to your vehicle if this code is set.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0179-code-fuel-composition-sensor-high-input\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-18T05:27:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-13T23:50:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/p0179-code-flex-fuel-sensor-issue.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1333\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0179-code-fuel-composition-sensor-high-input\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0179-code-fuel-composition-sensor-high-input\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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