{"id":16199,"date":"2021-09-02T23:34:00","date_gmt":"2021-09-03T06:34:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16199"},"modified":"2024-05-29T07:00:08","modified_gmt":"2024-05-29T14:00:08","slug":"c0040-code-right-front-wheel-speed-circuit-malfunction","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/c0040-code-right-front-wheel-speed-circuit-malfunction\/","title":{"rendered":"C0040 Code: Right Front Wheel Speed Circuit 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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_6c5cd3-0a > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_6c5cd3-0a > .kt-inside-inner-col,.kadence-column_6c5cd3-0a > .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_6c5cd3-0a > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_6c5cd3-0a > .kt-inside-inner-col{flex-direction:column;}.kadence-column_6c5cd3-0a > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_6c5cd3-0a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_6c5cd3-0a{position:relative;}@media all and (max-width: 1024px){.kadence-column_6c5cd3-0a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_6c5cd3-0a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_6c5cd3-0a qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-5aed50  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-935c1e\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_5e0477-16, .wp-block-kadence-advancedheading.kt-adv-heading_5e0477-16[data-kb-block=\"kb-adv-heading_5e0477-16\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_5e0477-16 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_5e0477-16[data-kb-block=\"kb-adv-heading_5e0477-16\"] 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_5e0477-16 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_5e0477-16[data-kb-block=\"kb-adv-heading_5e0477-16\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_5e0477-16 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_5e0477-16\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The C0040 code stands for &ldquo;Right Front Wheel Speed Circuit Malfunction.&rdquo;<\/li><li>It&rsquo;s logged when the anti-locking brake system (ABS) notices an issue with the right front wheel speed sensor.<\/li><li>Some common triggers for the code include a faulty wheel speed sensor and wheel speed sensor circuit problems.<\/li><li>This code has high repair urgency and difficulty level, so it must be resolved immediately by a professional.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Almost all modern vehicles come with vehicle dynamics systems, which, at the very least, include anti-lock brakes (ABS). For the <a href=\"https:\/\/www.carparts.com\/blog\/what-is-abs-anti-lock-braking-system-a-complete-guide\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ABS system\">ABS system<\/a> to work, the vehicle dynamics module(s) need(s) wheel speed information for each of the four wheels.<\/p>\n\n\n\n<p>The ABS system then uses wheel speed information to pulse the brakes during a sudden hard braking event to prevent wheel lockup, because when the wheels are sliding rather than rolling, you can&rsquo;t steer the vehicle, and that&rsquo;s dangerous. Most newer vehicles have vehicle stability systems with steering wheel rotation and vehicle yaw sensors so that during evasive maneuvers, the module will apply the brakes on just one wheel (depending on sensor inputs to keep the vehicle under the control of the driver. These are important systems designed to prevent accidents.<\/p>\n\n\n\n<p>The ABS code C0040 is a <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) that warns of a potential malfunction in one of the wheel speed sensors or the sensor&rsquo;s circuit.<\/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<h2 class=\"wp-block-heading\">What Does the C0040 Code Mean?<\/h2>\n\n\n\n<p>The C044 code stands for &ldquo;Right Front Wheel Speed Circuit Malfunction.&rdquo; It is set when the ABS module notices that there is an issue with the right front wheel speed sensor or its circuitry.<\/p>\n\n\n\n<p>The wheel speed sensors provide wheel speed input to the electronic module(s) that prevent wheel lockup and provide vehicle stability functions. There are usually four sensors, although some earlier ABS systems on rear wheel drive pickups and vans may simply measure rear axle speed or transmission output shaft speed. Cars always have four sensors if equipped with ABS, and vehicle dynamics systems always have a sensor at each wheel.<\/p>\n\n\n\n<p>If you&rsquo;re planning a DIY fix, you can read our technical discussion about <a href=\"https:\/\/www.carparts.com\/blog\/c0040-code-right-front-wheel-speed-circuit-malfunction\/#A_Closer_Look_at_Wheel_Speed_Sensors\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wheel speed sensors\">wheel speed sensors<\/a>.<\/p>\n\n\n\n<p>Continue reading to learn the possible causes of C0040.<\/p>\n\n\n\n<p><em><strong>Note<\/strong>: The definition of code C0040 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 Possible Causes of the C0040 Code?<\/h2>\n\n\n\n<p>As with most OBD-II codes, there are multiple possible reasons why the code C0040 may register in your vehicle&rsquo;s memory. Below are just some of these causes:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Faulty wheel speed sensor<\/li><li>Wheel speed sensor circuit problems<\/li><li>Reluctor or <a href=\"https:\/\/www.carparts.com\/blog\/how-much-does-a-wheel-bearing-replacement-cost-plus-more-faqs-answered\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wheel bearing\">wheel bearing<\/a> issues<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/what-are-the-symptoms-of-a-bad-abs-module-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Problem with the ABS module\">Problem with the ABS module<\/a><\/li><\/ul>\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\/2020\/09\/abs-warning-light-on-1024x683.jpeg\" alt=\"abs warning light on\" class=\"wp-image-16203\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/abs-warning-light-on-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/abs-warning-light-on-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/abs-warning-light-on-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/abs-warning-light-on-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/abs-warning-light-on-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/abs-warning-light-on.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>An illuminated ABS light is a common symptom of the C0040 code. <\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Symptoms of the C0040 Code?<\/h2>\n\n\n\n<p>If you&rsquo;re dealing with the C0040 code, you might deal with the following signs and symptoms as well.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Illuminated ABS light<\/li><li>Other illuminated warning lights (i.e. traction control)<\/li><li>Inoperative ABS system<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the C0040 Code<\/h2>\n\n\n\n<p>Troubleshooting OBD-II codes such as the code C0040 may sound intimidating, but it helps if you have the proper tools and information sources.<\/p>\n\n\n\n<p>As a seasoned DIYer, you may refer to a handy <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or database\">repair manual or database<\/a> for information. Consulting professional mechanics and technicians help, too. There are other sources and guides out there you can use for more information. Below is a helpful video resource on the C0040 code that you can use:<\/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=\"Solving a C0040 ABS Code using a Tech2\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/nachBPzhbvY?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 C0040 Code<\/h2>\n\n\n\n<p>There is no one-size-fits-all solution for OBD-II codes such as the C0040 because vehicles have different configurations and repair instructions, depending on their make and model. However, C0040 repair doesn&rsquo;t have to become complicated, as there are a lot of resources available such as repair manuals and databases. If you&rsquo;re not that confident in your own repair skills, you might want to leave the repairs to a professional so you can avoid more issues down the line.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Other Notes About C0040<\/strong><\/h2>\n\n\n\n<p>C0040 has high repair importance and difficulty level. This means that an amateur DIYer may lack the ability to address the issue properly without the proper tools and information. Problems with the wheel speed sensor may not affect your brake function, but it can affect handling in wet, slick, or icy road conditions. This is because the wheel speed sensors are also a primary input to the traction control and stability control systems.<\/p>\n\n\n\n<p>To prevent any further damage to the sensor or its related components, be vigilant and quick to address the issue immediately.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A Closer Look at Wheel Speed Sensors<\/h2>\n\n\n\n<p>Older wheel speed sensors are usually located outside the <a href=\"https:\/\/www.carparts.com\/wheel-hub\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wheel hub\">wheel hub<\/a>. Like any other speed sensor, this can be an <strong>inductive sensor<\/strong> (magnet with a wire coil surrounding it) that produces an AC analog wave, or it can be digital, so that it produces a square wave signal. Some square wave wheel speed sensors can even detect whether the vehicle is moving forward or backward.<\/p>\n\n\n\n<p>The sensor typically either reads steel teeth moving past the sensor as the wheel spins (this is very common) or in some cases, a series of small, carefully spaced magnets will be embedded in the bearing grease seal and the sensor will be designed to read those magnetic pulses. There are times when the magnets embedded within the bearing grease seal may cause a wheel speed sensor code, and in that case, the bearing must be replaced.<\/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\/2020\/09\/wheel-hub-with-abs-sensor-1024x896.jpeg\" alt=\"wheel hub with abs sensor\" class=\"wp-image-16202\" width=\"1024\" height=\"896\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/wheel-hub-with-abs-sensor-1024x896.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/wheel-hub-with-abs-sensor-300x263.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/wheel-hub-with-abs-sensor-768x672.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/wheel-hub-with-abs-sensor-150x131.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/wheel-hub-with-abs-sensor.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption> Older wheel speed sensors are usually located outside the <a href=\"https:\/\/www.carparts.com\/wheel-hub\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wheel hub\">wheel hub<\/a>. You can often find modern wheel speed sensors in the wheel hub assembly. <\/figcaption><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>There are times when the magnets embedded within the bearing grease seal may cause a wheel speed sensor code, and in that case, the bearing must be replaced.<\/p><cite>&ndash;<a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p>The information that the sensors generate is used by the <a href=\"https:\/\/www.carparts.com\/abs-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ABS computer or module\">ABS computer or module<\/a>to control the ABS system. It may also be used by other modules, however, this depends on the make and model of the vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a New Wheel Speed Sensor for Your Vehicle<\/h2>\n\n\n\n<p>The symptoms above are only some of the head-scratching issues your vehicle could develop if it logged the C0040 code due to a faulty <a href=\"https:\/\/www.carparts.com\/abs-speed-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wheel speed sensor\">wheel speed sensor<\/a>. As such, you must replace it as soon as you can. With <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>, you can get what you need and repair your ride in time.<\/p>\n\n\n\n<p>All our parts are on hand and ready to ship from a warehouse near you. So if you place your order today, you can get your new sensor in as fast as two business days.<\/p>\n\n\n\n<p>You can browse our wide array of wheel speed sensors anytime anywhere on your mobile device or computer. Fill in the vehicle selector to view compatible parts, then use the filters to check out the sensors that match your preferred specs, brand, and price range. You can place your order using our website or dial our toll-free hotline for further assistance.<\/p>\n\n\n\n<p>So don&rsquo;t sit around and wait for the negative effects of a faulty wheel speed sensor to get worse. Order a replacement today.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n<!-- start of editable content -->\n\n<a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" aria-label=\"Engine Control Module\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/a1790044v_1\">\n<strong>Engine Control Module<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/abs-control-module\" target=\"_blank\" aria-label=\"ABS Control Module\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/a1121000_1\">\n<strong>ABS Control Module<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/abs-speed-sensor\" target=\"_blank\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/rt31080005_1\">\n<strong>ABS Speed Sensor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/wheel-hub\" target=\"_blank\" aria-label=\"Wheel Hub\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repc283707_1\">\n<strong>Wheel Hub<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/axle-shaft\" target=\"_blank\" aria-label=\"Axle Shaft\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/rd28170001_1\">\n<strong>Axle Shaft<\/strong>\n<\/a>\n\n<!-- end of editable content -->\n\n<\/div>\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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Almost all modern vehicles come with vehicle dynamics systems, which, at the very least, include anti-lock brakes (ABS). For the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/c0040-code-right-front-wheel-speed-circuit-malfunction\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":16201,"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":[1863,1865,888,1323,710],"ppma_author":[2607,2985],"class_list":{"0":"post-16199","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-abs-control-module","9":"tag-abs-speed-sensor","10":"tag-axle-shaft","11":"tag-engine-control-module-2","12":"tag-wheel-hub","13":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C0040 Code: Right Front Wheel Speed Circuit Malfunction - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"The C0040 code indicates an issue with one of the wheel speed sensors of a vehicle. Find out more about this code with this short guide.\" \/>\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\/c0040-code-right-front-wheel-speed-circuit-malfunction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C0040 Code: Right Front Wheel Speed Circuit Malfunction - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"The C0040 code indicates an issue with one of the wheel speed sensors of a vehicle. 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