{"id":64121,"date":"2021-12-16T00:09:58","date_gmt":"2021-12-16T08:09:58","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=64121"},"modified":"2024-08-19T23:54:26","modified_gmt":"2024-08-20T06:54:26","slug":"p0483-code-cooling-fan-rationality-check-malfunction","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0483-code-cooling-fan-rationality-check-malfunction\/","title":{"rendered":"P0483 Code: Cooling Fan Rationality Check Malfunction"},"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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column64121_db0aca-5c > .kt-inside-inner-col,.kadence-column64121_db0aca-5c > .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-column64121_db0aca-5c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column64121_db0aca-5c > .kt-inside-inner-col{flex-direction:column;}.kadence-column64121_db0aca-5c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column64121_db0aca-5c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column64121_db0aca-5c{position:relative;}@media all and (max-width: 1024px){.kadence-column64121_db0aca-5c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column64121_db0aca-5c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column64121_db0aca-5c inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-4d6f74  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-7c64dc\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading64121_3d9c3d-88, .wp-block-kadence-advancedheading.kt-adv-heading64121_3d9c3d-88[data-kb-block=\"kb-adv-heading64121_3d9c3d-88\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading64121_3d9c3d-88 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading64121_3d9c3d-88[data-kb-block=\"kb-adv-heading64121_3d9c3d-88\"] 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-heading64121_3d9c3d-88 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading64121_3d9c3d-88[data-kb-block=\"kb-adv-heading64121_3d9c3d-88\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading64121_3d9c3d-88 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading64121_3d9c3d-88\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DTC P0483 stands for &ldquo;Cooling Fan Rationality Check Malfunction&rdquo;<\/li>\n\n\n\n<li>This code is set when the PCM detects that the current being drawn by the cooling fan control circuit is either too high or too low.<\/li>\n\n\n\n<li>Code P0483 is commonly caused by cooling fan control module failure, problems with the cooling fan, and wiring issues.<\/li>\n\n\n\n<li>Common symptoms include a lit check engine light, cooling fans that are always on even when they shouldn&rsquo;t be, and an overheating engine.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Identifying what a trouble code means is important to properly fix the issues in your vehicle. If you recently encountered the P0483 code, this article will help you learn more about its meaning, possible causes, and common symptoms.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0483 Code Mean?&nbsp;<\/h2>\n\n\n\n<p>The P0483 code is defined as &ldquo;cooling fan rationality check malfunction.&rdquo; It is usually triggered by your powertrain control module (PCM) when it detects that the current being drawn by the cooling fan control circuit is either too high or too low. This means that the cooling fan is operating differently from how the PCM intended.<\/p>\n\n\n\n<p><strong>P0483 on a 2006 Subaru<\/strong><\/p>\n\n\n\n<p>The meaning of code P0483 varies from manufacturer to manufacturer. On a 2006 Subaru, for example, a pure &ldquo;rationality check&rdquo; is used. If the engine coolant temperature is greater than or equal to 100&deg;C (212&deg;F) and the radiator fan command from the ECM changes from OFF to ON, the engine coolant temperature is monitored and expected to decrease. If it doesn&rsquo;t, this code is set. That&rsquo;s a simple rationality test.<\/p>\n\n\n\n<p><strong>P0483 on a 2006 Chevrolet Trailblazer<\/strong><\/p>\n\n\n\n<p>On a 2006 Chevy Trailblazer, P0483 is set when the difference between the commanded and actual cooling fan speeds are greater than 1000 rpm. In other words, the ECM\/PCM is monitoring the speed of the fan (which is variable) and when the fan speed isn&rsquo;t within range of the expected commanded window, this code is set.<\/p>\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<p>The 2006 Ford cooling fan criteria for this code is very similar to the 2006 Chevy Trailblazer fan and the pinpoint test leads through a test of circuits, connectors, and components.<\/p>\n\n\n\n<p>Our quick discussion about <a href=\"https:\/\/www.carparts.com\/blog\/p0483-code-cooling-fan-rationality-check-malfunction\/#A_Quick_Note_About_Rationality_Checks\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"rationality checks\">rationality checks<\/a> and <a href=\"https:\/\/www.carparts.com\/blog\/p0483-code-cooling-fan-rationality-check-malfunction\/#About_Electric_Cooling_Fans\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"electric cooling fans\">electric cooling fans<\/a> can help you better understand how P0483 is set.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> Again, the definition of code P0483 may 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 P0483 Code?<\/h2>\n\n\n\n<p>The definition indicates that there is a problem with the cooling fan, but it can also be caused by other components. Its list of common causes include:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/cooling-fan-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Cooling fan control module\">Cooling fan control module<\/a> failure&nbsp;<\/li>\n\n\n\n<li>Cooling fan failure<\/li>\n\n\n\n<li>Cooling fan relay module failure<\/li>\n\n\n\n<li>Wiring issues<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/what-are-the-common-signs-of-a-bad-thermostat\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty thermostat\">Faulty thermostat<\/a> or <a href=\"https:\/\/www.carparts.com\/blog\/signs-of-a-bad-water-pump\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"water pump\">water pump<\/a><\/li>\n\n\n\n<li>Faulty PCM&nbsp;<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/car-thermostat-1024x683.jpg\" alt=\"car thermostat\" class=\"wp-image-64346\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/car-thermostat-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/car-thermostat-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/car-thermostat-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/car-thermostat-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/car-thermostat-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/12\/car-thermostat.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">A faulty thermostat is one of the common causes of P0483 code.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0483 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cooling fans are always turned on<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-overheats-when-the-ac-is-on-causes-and-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Engine overheating\">Engine overheating<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Check engine light is on\">Check engine light is on<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0483 Code<\/h2>\n\n\n\n<p>While the definition of the code indicates that the cooling fan has a problem, identifying whether it&rsquo;s caused by the cooling fan or the cooling fan module may be difficult for inexperienced users. To get an accurate diagnosis, you may want to consult a trusted mechanic. If you want to learn about diagnosing a P0483 code, you can check out the video below.<\/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=\"P0483 Cooling Fan Problem - Subaru Outback\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/YElByNoAz90?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 P0483 Code<\/h2>\n\n\n\n<p>Before you perform any repair, you&rsquo;ll need to accurately diagnose the cause of the code. There isn&rsquo;t usually an all-encompassing fix for any <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD-II code\">OBD-II code<\/a>, which is why diagnosis is important. Otherwise, you might end up fixing or replacing a part that&rsquo;s still functioning.&nbsp;<\/p>\n\n\n\n<p>Once you&rsquo;ve identified the issue causing the P0483 code, you can then consult online auto repair resources and how-to guides for possible solutions.&nbsp;<\/p>\n\n\n\n<p>All vehicles are different. This means a fix for an OBD-II code for one vehicle may not be applicable for another. As a result, you should <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"consult your vehicle&rsquo;s repair manual\">consult your vehicle&rsquo;s repair manual<\/a> when it comes to troubleshooting and repairing diagnostic trouble codes. Chilton repair manuals may also be useful. However, ALLDATA subscriptions are even better, as they provide detailed factory repair information for drivers who want to do repairs themselves.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Notes About P0483&nbsp;<\/h2>\n\n\n\n<p>The definition of this code typically applies to all OBD-II equipped vehicles. They can show up more often in certain vehicle models made by <a href=\"https:\/\/www.carparts.com\/cooling-fan-assembly\/isuzu\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Isuzu\">Isuzu<\/a>, <a href=\"https:\/\/www.carparts.com\/cooling-fan-assembly\/ford\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Ford\">Ford<\/a>, <a href=\"https:\/\/www.carparts.com\/cooling-fan-assembly\/mazda\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Mazda\">Mazda<\/a>, <a href=\"https:\/\/www.carparts.com\/cooling-fan-assembly\/mercedes-benz\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Mercedes Benz\">Mercedes Benz<\/a>, and <a href=\"https:\/\/www.carparts.com\/cooling-fan-assembly\/subaru\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Subaru\">Subaru<\/a>.&nbsp;<\/p>\n\n\n\n<p>There are other cooling fan-related trouble codes such as the <a href=\"https:\/\/www.carparts.com\/blog\/p0480-code-fan-1-control-circuit\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P0480\">P0480<\/a>, <a href=\"https:\/\/www.carparts.com\/blog\/p0481-code-fan-2-control-circuit\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P0481\">P0481<\/a>, P0482, P0484, and P0485.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A Quick Note About Rationality Checks<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"941\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/automotive-ecm-monitoring-various-car-parts-1024x941.jpg\" alt=\"automotive ecm monitoring various car parts\" class=\"wp-image-79950\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/automotive-ecm-monitoring-various-car-parts-1024x941.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/automotive-ecm-monitoring-various-car-parts-300x276.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/automotive-ecm-monitoring-various-car-parts-768x705.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/automotive-ecm-monitoring-various-car-parts-1536x1411.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/automotive-ecm-monitoring-various-car-parts-150x138.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/automotive-ecm-monitoring-various-car-parts.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The ECM\/PCM is always watching related inputs and comparing them to one another.<\/figcaption><\/figure>\n\n\n\n<p>The ECM\/PCM is always watching related inputs and comparing them to one another. For just one example of many, let&rsquo;s say that on a vehicle that uses idle air control (IAC) and a MAF sensor. The ECM\/PCM commands the IAC to increase idle airflow and idle speed, but the mass airflow input doesn&rsquo;t reflect increased airflow. This indicates that either the MAF isn&rsquo;t reliable or the IAC failed to increase airflow, and a code will be set based on the lack of MAF response.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">About Electric Cooling Fans<\/h2>\n\n\n\n<p>Belt-driven engine cooling fans were the order of things until transversely mounted front wheel drive engines made electric cooling fans necessary. But belt driven fans rob power from the engine, and so electrically driven or electrically controlled fans have largely become the order of things even on linear mounted engines in gasoline powered vehicles.<\/p>\n\n\n\n<p>Electrically driven cooling fans have a powerful DC motor driving a fan that draws air through the radiator and A\/C condenser when the vehicle isn&rsquo;t moving. Many vehicles will have two fans that work together. GM and Ford tended to use a trio of relays and two switches so that the fans could either run at half speed (in series) or full speed (parallel), depending on prevailing demands. These systems can also run just one fan rather than using both fans.<\/p>\n\n\n\n<p>Some electric cooling fans use a special module to control the fan(s). But many vehicles still have viscous clutches that enable the fan to spin much slower than the driving pulley. Except that since the early 2000s, these viscous clutches are controlled by the ECM\/PCM rather than with the old-fashioned integral bi-metal spring and valve affair used on older viscous fan systems. This kind of control enables the ECM\/PCM to precisely control the speed of the cooling fan in a variable<em> <\/em>fashion rather than simply having one or two speeds.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a New Cooling Fan Control Module to Clear Code P0483<\/h2>\n\n\n\n<p>If a bad <a href=\"https:\/\/www.carparts.com\/cooling-fan-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"cooling fan control module\">cooling fan control module<\/a> triggered the P0483 code, don&rsquo;t put off replacing it to prevent fan and engine problems. For an OE-grade module that won&rsquo;t break the bank, look no further than <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>Our website makes it easy for car owners like you to find the right parts for your ride. Simply use our vehicle selector and search filters to view compatible modules with the brand and price you prefer. Our selection includes accurate and detailed fitment information, so you&rsquo;re sure to get exactly what your car needs to get back on the road.<\/p>\n\n\n\n<p>We make it a point to get all our auto parts from the most trusted manufacturers in the industry. In short, you won&rsquo;t have to worry about your new cooling fan control module failing you any time soon.<\/p>\n\n\n\n<p>On top of that, you won&rsquo;t have to wait too long to get them either. All our parts are on hand and ready to ship from a distribution center near you to guarantee fast shipping.<\/p>\n\n\n\n<p>Don&rsquo;t hold off on addressing DTC P0483. Shop now to get your hands on a new cooling fan control module in no time!<\/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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Identifying what a trouble code means is important to properly fix the issues in your vehicle. If you recently encountered&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0483-code-cooling-fan-rationality-check-malfunction\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":64344,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"_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":[1063],"ppma_author":[2607,2985],"class_list":{"0":"post-64121","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-cooling-fan-assembly","9":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0483 Code: Cooling Fan Rationality Check Malfunction - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"The P0483 code is triggered when your vehicle\u2019s cooling fan has issues. Learn more about its definition, causes, and symptoms here.\" \/>\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\/p0483-code-cooling-fan-rationality-check-malfunction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0483 Code: Cooling Fan Rationality Check Malfunction - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"The P0483 code is triggered when your vehicle\u2019s cooling fan has issues. 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