{"id":43992,"date":"2022-07-21T09:12:09","date_gmt":"2022-07-21T09:12:09","guid":{"rendered":" https:\/\/dev.way.com\/blog\/?p=43992"},"modified":"2022-07-21T09:19:38","modified_gmt":"2022-07-21T09:19:38","slug":"p0178-code","status":"publish","type":"post","link":"https:\/\/dev.way.com\/journal\/p0178-code\/","title":{"rendered":"How to Fix a P0178 Code \u2013 Causes, Symptoms and Cost"},"content":{"rendered":"<p style=\"text-align: center;\"><em>The manufacturer code P0178 is not frequently used. The engine fuel has a flag set in the computer memory to indicate that it contains or once included water. The code solely serves as a warning that there is water in the fuel, and fuel additives could ruin it.<\/em><\/p>\n<p><span data-preserver-spaces=\"true\">The last thing you want to deal with while driving is a check engine light on the dash. However, when it does, it might not be very comforting. They give you the code as you rush it to the parts store. But what follows?<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">The good news is that if you have a P0178 error code, fixing it is a rather simple procedure. We&#8217;ll go through everything you need to know to get your car running again.<\/span><\/p>\n<p><a href=\"http:\/\/www.way.com\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-44037 size-large\" src=\"https:\/\/blog.way.com\/wp-content\/uploads\/2022\/07\/MicrosoftTeams-image-2-1024x379.jpg\" alt=\"The manufacturer code P0178 is not frequently used.\" width=\"640\" height=\"237\" srcset=\"http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/MicrosoftTeams-image-2-1024x379.jpg 1024w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/MicrosoftTeams-image-2-300x111.jpg 300w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/MicrosoftTeams-image-2-768x284.jpg 768w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/MicrosoftTeams-image-2-1536x569.jpg 1536w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/MicrosoftTeams-image-2-2048x758.jpg 2048w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #e71346;color:#e71346\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #e71346;color:#e71346\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/#What_does_Code_P0178_mean\" >What does Code P0178 mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/#What_causes_Code_P0178\" >What causes Code P0178?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/#What_are_the_Symptoms_of_Code_P0178\" >What are the Symptoms of Code P0178?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/#How_does_a_mechanic_scan_for_Code_P0178\" >How does a mechanic scan for Code P0178?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/#What_to_avoid_when_checking_for_Code_P0178\" >What to avoid when checking for Code P0178?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/#How_serious_is_code_P0178\" >How serious is code P0178?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/#How_to_Fix_P0178_code\" >How to Fix P0178 code?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/#Cost_of_repairing_a_P0178_issue\" >Cost of repairing a P0178 issue<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_does_Code_P0178_mean\"><\/span><span data-preserver-spaces=\"true\">What does Code P0178 mean?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">Fuel composition sensors are not standard equipment in cars; they are uncommon. This sensor, which informs your engine of the current composition of ethanol in the fuel, is only present in vehicles that can use flex fuel.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">When your engine displays the P0178 code, the sensor is either not producing any readings or producing readings outside the normal range. <\/span><span data-preserver-spaces=\"true\">In either case, your engine will default to a predetermined value and won&#8217;t be able to transition as it should between standard fuel and flex-fuel.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media0.giphy.com\/media\/8L0Pky6C83SzkzU55a\/giphy.gif?cid=790b761135e4a4a9c76bf6865bc43ca06e765bbecd5796ff&amp;rid=giphy.gif&amp;ct=g\" alt=\"Internet Nerd GIF by MINI Italia\" \/><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/giphy.com\/gifs\/mini-italia-8L0Pky6C83SzkzU55a\">via GIPHY<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_causes_Code_P0178\"><\/span><span data-preserver-spaces=\"true\">What causes Code P0178?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">A malfunctioning fuel composition sensor is the most frequent reason for a code P0178. Although that is the most typical issue, other issues could arise.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">If the sensor input is below standards, the engine control module (ECM) recognizes that the sensor circuit is open. Likewise, if the wiring or connection to the sensor is not creating a complete circuit due to a loose connection or cut wiring, the ECM senses that the circuit is open.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">The code informs you that the reading is either not getting to the ECM or is outside acceptable bounds. Of course, even if the sensor is functioning properly, a wiring problem will prevent the reading from reaching the ECM, which will cause the code to be set.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Lastly, your Power Control Module may have an issue (PCM). These issues are exceedingly uncommon, and it&#8217;s more likely that an update is all that&#8217;s required.\u00a0<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">The check engine light would rarely come on without an update because PCMs are extremely durable parts.<\/span><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">Failure of the fuel composition sensor<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Wiring problems<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Failure of the power control module (PCM)<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Updating the Power Control Module (PCM)<\/span><\/li>\n<\/ul>\n<h2><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-43994 size-large\" src=\"https:\/\/blog.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513605652_XL-min-1024x683.jpg\" alt=\"The fuel you currently use will be one of the most important aspects influencing your car's symptoms when it has the code P0178.\" width=\"640\" height=\"427\" srcset=\"http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513605652_XL-min-1024x683.jpg 1024w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513605652_XL-min-300x200.jpg 300w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513605652_XL-min-768x512.jpg 768w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513605652_XL-min-1536x1024.jpg 1536w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513605652_XL-min-2048x1365.jpg 2048w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513605652_XL-min-600x400.jpg 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"What_are_the_Symptoms_of_Code_P0178\"><\/span><span data-preserver-spaces=\"true\">What are the Symptoms of Code P0178?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">The fuel you currently use will be one of the most important aspects influencing your car&#8217;s symptoms when it has the code P0178.\u00a0<\/span><span data-preserver-spaces=\"true\">You&#8217;ll typically be unable to use flex-fuel since the Engine Control Module (ECM) defaults to a value.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">However, even if your car isn&#8217;t designed to run on flex fuel, your engine can usually handle it. So you&#8217;ll only see a loss in engine power, jerky starts, and more fuel consumption. Rarely, but occasionally, you won&#8217;t be able to start your car at all.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">You will experience the same signs and symptoms if your car gets a P0178 code:<\/span><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">Engine performance drops.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Does not start or difficult to start<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Lower mileage<\/span><\/li>\n<\/ul>\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-43995 size-large\" src=\"https:\/\/blog.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513583670_XL-min-1024x683.jpg\" alt=\"How does a mechanic scan for Code P0178? Scans the codes, records the freeze frame information, then clears the codes to ensure that the codes have returned. Performs a visual inspection of all the sensors' wiring and connections to look for loose connections or broken wires. Checks to determine if the sensor is testing within requirements.\" width=\"640\" height=\"427\" srcset=\"http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513583670_XL-min-1024x683.jpg 1024w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513583670_XL-min-300x200.jpg 300w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513583670_XL-min-768x512.jpg 768w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513583670_XL-min-1536x1024.jpg 1536w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513583670_XL-min-2048x1365.jpg 2048w, http:\/\/wordwblog02.way.com\/wp-content\/uploads\/2022\/07\/Depositphotos_513583670_XL-min-600x400.jpg 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"How_does_a_mechanic_scan_for_Code_P0178\"><\/span>How does a mechanic scan for Code P0178?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span data-preserver-spaces=\"true\">Scans the codes, records the freeze frame information, then clears the codes to ensure that the codes have returned.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Performs a visual inspection of all the sensors&#8217; wiring and connections to look for loose connections or broken wires.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Checks to determine if the sensor is testing within requirements.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"What_to_avoid_when_checking_for_Code_P0178\"><\/span><span data-preserver-spaces=\"true\">What to avoid when checking for Code P0178?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">To avoid misdiagnosis, adhere to this easy rule:<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Please make sure the connections to the sensor are making good contact by visually inspecting them. After servicing the filter, the connection might not have been securely secured, causing it to become loose.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_serious_is_code_P0178\"><\/span><span data-preserver-spaces=\"true\">How serious is code P0178?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">While a P0178 error code can be temporarily ignored, having the problem fixed as soon as possible is preferable. Use ordinary fuel instead of flex-fuel until you can have it fixed.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">That said, it cannot continue in that manner indefinitely. Without precise readings from the fuel composition sensor, the engine cannot adapt its performance to changing ethanol levels in the fuel, as was intended by the manufacturer.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Your engine suffers over time from sluggish starts and poor performance. Therefore you should take care of these issues as soon as possible:<\/span><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">If too much water is in the fuel and the sensor cannot detect it, problems with the engine starting and running may occur.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">The engine could stall or misfire.<\/span><\/li>\n<\/ul>\n<p><span data-preserver-spaces=\"true\">The check engine and water in fuel lights will be illuminated if there are no fuel-related issues.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Fix_P0178_code\"><\/span><span data-preserver-spaces=\"true\">How to Fix P0178 code?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">To fix the P0178 code you should check to see if the fuel composition sensor is the issue.\u00a0 <\/span><span data-preserver-spaces=\"true\">The simple solution is to buy a new fuel composition sensor and replace the old one.\u00a0<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Unfortunately, the task can be a little challenging, and the sensor isn&#8217;t particularly inexpensive. For example, replacing the sensor costs between $500 and $600 in labor and supplies. Even worse, a dealership is the only place where you can test the sensor itself.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Even though the sensor is the issue 95% of the time, it would be nice to have guarantees before spending a few hundred dollars on a part.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">The wiring can then be checked to ensure everything is in working order. You most likely have a PCM issue if there isn&#8217;t a break between the PCM and the fuel composition sensor. It might require updating, reflashing, or replacement.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">You must take the PCM to a dealership or another location with the appropriate programming equipment to have it corrected, regardless of what the PCM requires.\u00a0<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">This is not a DIY project since even if you change the PCM, you&#8217;ll still need to program it to the engine.<\/span><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">Clearing the Check Engine Light&#8217;s codes and draining the water from the fuel filter.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Changing the open, faulty sensor.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Repairing the sensor&#8217;s open circuit, burned wiring, or connection.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Clearing the codes and replacing the sensor with the fuel filter housing.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cost_of_repairing_a_P0178_issue\"><\/span><span data-preserver-spaces=\"true\">Cost of repairing a P0178 issue<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">P0178 stands for &#8220;Fuel Composition Sensor Circuit Low Input&#8221; as a diagnostic trouble code (DTC). Numerous things can cause this. Thus a technician must identify the precise cause in your case to clear the code.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">For $120, a qualified car mechanic will visit your house or office to run the check engine light diagnostic. You&#8217;ll get an upfront price for the suggested once they&#8217;ve identified the issue.<\/span><\/p>\n<hr \/>\n<p style=\"text-align: center;\"><em><span data-preserver-spaces=\"true\">Here&#8217;s more info on\u00a0<\/span><\/em><a class=\"editor-rtfLink\" href=\"https:\/\/www.way.com\/airport-parking\" target=\"_blank\" rel=\"noopener\"><em><span data-preserver-spaces=\"true\">top-rated airport parking<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">,\u00a0<\/span><\/em><a class=\"editor-rtfLink\" href=\"https:\/\/www.way.com\/cities\" target=\"_blank\" rel=\"noopener\"><em><span data-preserver-spaces=\"true\">the best parking spots in your city<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">, affordable\u00a0<\/span><\/em><a class=\"editor-rtfLink\" href=\"https:\/\/www.way.com\/auto-insurance\" target=\"_blank\" rel=\"noopener\"><em><span data-preserver-spaces=\"true\">auto insurance<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">, easy\u00a0<\/span><\/em><a class=\"editor-rtfLink\" href=\"https:\/\/www.way.com\/auto-refinance\" target=\"_blank\" rel=\"noopener\"><em><span data-preserver-spaces=\"true\">auto refinance<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">, and\u00a0<\/span><\/em><a class=\"editor-rtfLink\" href=\"https:\/\/www.way.com\/car-wash-near-me\" target=\"_blank\" rel=\"noopener\"><em><span data-preserver-spaces=\"true\">high-quality car washes near you<\/span><\/em><\/a><em><span data-preserver-spaces=\"true\">.<\/span><\/em><\/p>\n<hr \/>\n<p style=\"text-align: center;\">\n","protected":false},"excerpt":{"rendered":"<p>The manufacturer code P0178 is not frequently used. The engine fuel has a flag set in the computer memory to indicate that it contains or once included water. The code solely serves as a warning that there is water in the fuel, and fuel additives could ruin it. The last thing you want to deal&hellip; <a class=\"more-link\" href=\"https:\/\/dev.way.com\/journal\/p0178-code\/\">Continue reading <span class=\"screen-reader-text\">How to Fix a P0178 Code \u2013 Causes, Symptoms and Cost<\/span><\/a><\/p>\n","protected":false},"author":46,"featured_media":43993,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,605,5676],"tags":[],"class_list":["post-43992","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cars-explained","category-car-care-tips","category-engine-codes","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.3 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>P0178 Code: Know the causes, symptoms and cost<\/title>\n<meta name=\"description\" content=\"The manufacturer code P0178 is not frequently used. The code solely serves as a warning that there is water in the fuel. Read to know more.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Fix a P0178 Code \u2013 Causes, Symptoms and Cost\" \/>\n<meta property=\"og:description\" content=\"The manufacturer code P0178 is not frequently used. The code solely serves as a warning that there is water in the fuel. 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