{"id":67863,"date":"2022-04-08T00:28:41","date_gmt":"2022-04-08T07:28:41","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=67863"},"modified":"2024-08-16T06:08:15","modified_gmt":"2024-08-16T13:08:15","slug":"p0504-code-brake-switch-a-b-correlation-code","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0504-code-brake-switch-a-b-correlation-code\/","title":{"rendered":"P0504 Code: Brake Switch A\/B Correlation Code"},"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-column67863_254c63-19 > .kt-inside-inner-col,.kadence-column67863_254c63-19 > .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-column67863_254c63-19 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column67863_254c63-19 > .kt-inside-inner-col{flex-direction:column;}.kadence-column67863_254c63-19 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column67863_254c63-19 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column67863_254c63-19{position:relative;}@media all and (max-width: 1024px){.kadence-column67863_254c63-19 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column67863_254c63-19 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column67863_254c63-19 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-e72819  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-1d1c14\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading67863_7528b0-68, .wp-block-kadence-advancedheading.kt-adv-heading67863_7528b0-68[data-kb-block=\"kb-adv-heading67863_7528b0-68\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading67863_7528b0-68 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading67863_7528b0-68[data-kb-block=\"kb-adv-heading67863_7528b0-68\"] 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-heading67863_7528b0-68 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading67863_7528b0-68[data-kb-block=\"kb-adv-heading67863_7528b0-68\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading67863_7528b0-68 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading67863_7528b0-68\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Diagnostic trouble code (DTC) P0504 stands for &ldquo;Brake Switch A\/B Correlation Code.&rdquo; Any problem with the brake switch, which closes and activates the brake lights when the driver steps on the brake pedal, will cause on-board diagnostics (OBD) to log a P0504 code.<\/li>\n\n\n\n<li>Causes of the P0504 code include a failed brake light switch, a brake pedal that&rsquo;s out of adjustment, wiring issues, and powertrain control module (PCM) failure.<\/li>\n\n\n\n<li>Symptoms of the P0504 code include shifting issues, the engine stalling when braking, inoperative cruise control, and brake lights that won&rsquo;t illuminate.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The brake switch alerts the powertrain control module (PCM) that the brake pedal is depressed. The switch receives current from a constantly hot fuse and is normally open (N.O.) unless the driver steps on the brake pedal. If the PCM detects an incorrect signal or an electrical fault coming from the brake switch, it will log a P0504 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How a Brake Switch Works<\/h2>\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\/2022\/04\/shoe-steps-on-brake-pedal-pad-1024x683.jpg\" alt=\"stepping on the brake pedal pad\" class=\"wp-image-68092\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/shoe-steps-on-brake-pedal-pad-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/shoe-steps-on-brake-pedal-pad-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/shoe-steps-on-brake-pedal-pad-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/shoe-steps-on-brake-pedal-pad-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/shoe-steps-on-brake-pedal-pad-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/shoe-steps-on-brake-pedal-pad-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/shoe-steps-on-brake-pedal-pad-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">As the driver steps on the brake pedal, a spring causes the brake switch to close which completes the electrical circuit and activates the brake lights.<\/figcaption><\/figure>\n\n\n\n<p>As the driver steps on the brake pedal, a spring causes the brake switch to close which completes the electrical circuit and activates the brake lights. Once the pedal is released, a plunger connected to the switch is depressed and turns off the lights.<\/p>\n\n\n\n<p>The brake switch is also used as an input switch for cruise control, anti-lock brakes, and brake shift interlock.<\/p>\n\n\n\n<p>The brake and <a href=\"https:\/\/www.carparts.com\/turn-signal-switch\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"turn signal switches\">turn signal switches<\/a> are not connected for systems using separate filaments for the stop and turn signal lights. If the vehicle uses one filament for both lights, brake switch current is routed through contacts within the turn signal switch.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does a P0504 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) stands for &ldquo;Brake Switch A\/B Correlation Code.&rdquo;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/auto-mechanic-using-diagnostic-scan-tool-inside-the-car-1024x682.jpg\" alt=\"auto mechanic using diagnostic scan tool inside the car\" class=\"wp-image-68094\" style=\"width:1024px;height:682px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/auto-mechanic-using-diagnostic-scan-tool-inside-the-car-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/auto-mechanic-using-diagnostic-scan-tool-inside-the-car-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/auto-mechanic-using-diagnostic-scan-tool-inside-the-car-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/auto-mechanic-using-diagnostic-scan-tool-inside-the-car-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/auto-mechanic-using-diagnostic-scan-tool-inside-the-car-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/auto-mechanic-using-diagnostic-scan-tool-inside-the-car-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/auto-mechanic-using-diagnostic-scan-tool-inside-the-car.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Any problem with the brake switch will cause on-board diagnostics (OBD) to log a P0504 code.<\/figcaption><\/figure>\n\n\n\n<p>The brake light switch is a &ldquo;normally open&rdquo; switch held by a tab on the brake pedal. This keeps the brake lights turned off. Once the brakes are applied, the switch closes and activates the brake lights.<\/p>\n\n\n\n<p>Any problem with the brake switch will cause on-board diagnostics (OBD) to log a P0504 code.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code P0504 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 P0504 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Failed <a href=\"https:\/\/www.carparts.com\/brake-light-switch\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"brake light switch\">brake light switch<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/brake-pedal-pad\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Brake pedal\">Brake pedal<\/a> out of adjustment<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Wiring\">Wiring<\/a> issues<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> failure<\/li>\n<\/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 P0504 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shifting issues<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-shuts-off-while-driving-causes-what-to-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Engine stalling when braking\">Engine stalling when braking<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/cruise-control-not-working-causes-and-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Inoperative cruise control\">Inoperative cruise control<\/a><\/li>\n\n\n\n<li>Brake lights won&rsquo;t illuminate<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0504 Code<\/h2>\n\n\n\n<p>DTC P0504 is a generic powertrain code. Makes like <a href=\"https:\/\/carparts.com\/kia\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"Kia\">Kia<\/a>, <a href=\"https:\/\/www.carparts.com\/hyundai\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Hyundai\">Hyundai<\/a>, and <a href=\"https:\/\/www.carparts.com\/toyota\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Toyota\">Toyota<\/a>, can log a P0504 code. While vehicles can exhibit similar symptoms, steps for diagnosis and repair can vary depending on their specifications. If you&rsquo;re not familiar with auto repair, it might be a good idea to bring your vehicle to a professional.<\/p>\n\n\n\n<p>Here is a video that shows what the diagnostic process 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=\"2007 Santa Fe P0504 Brake Switch A\/B Correlation\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/JIg5BK0xK5E?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 P0504 Code<\/h2>\n\n\n\n<p>Attempting to fix a P0504 code can be confusing if you don&rsquo;t have the right tools and information. If you&rsquo;re not confident with your DIY skills yet, it would be best to consult a certified mechanic.&nbsp;If you&rsquo;re a seasoned DIYer who plans on resolving this code on your own, <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"make sure to read your vehicle&rsquo;s repair manual\">make sure to read your vehicle&rsquo;s repair manual<\/a> before proceeding. You can check out guides like those from Chilton or an ALLDATA subscription for vehicle-specific repair information before your start.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Get a New Brake Light Switch Online<\/h2>\n\n\n\n<p>If a bad brake light switch is the cause of the P0504 code being set in your vehicle, it&rsquo;s best to avoid driving it until you have replaced its bad brake light switch. Order a replacement brake light switch from CarParts.com and have it quickly delivered to your doorstep.<\/p>\n\n\n\n<p>CarParts.com delivers the brake light switch that you need to where you need it. When you purchase a product from our online store, our nearest distribution warehouse processes your order and ships your new part. If you live anywhere in the continental US and order by noon ET, you can expect your replacement brake light switch to reach your home in several business days. We exclusively source our products from the top brands, ensuring that you get the performance and reliability you deserve. Ask our helpful customer service team for assistance with our products, such as fitment and pricing.<\/p>\n\n\n\n<p>Get an affordable, high-quality brake light switch at CarParts.com. Browse our selection of <a href=\"https:\/\/www.carparts.com\/brake-light-switch\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"brake light switches\">brake light switches<\/a> and order what you need today.<\/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>The brake switch alerts the powertrain control module (PCM) that the brake pedal is depressed. The switch receives current from&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0504-code-brake-switch-a-b-correlation-code\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":68093,"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":[1800,1323,1648],"ppma_author":[2607,2855],"class_list":{"0":"post-67863","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-brake-light-switch","9":"tag-engine-control-module-2","10":"tag-turn-signal-switch","11":"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>P0504 Code: Brake Switch A\/B Correlation Code - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what P0504 means, its symptoms, and the most common causes that can trigger this code. Plus find out what to do if your car logs P0504.\" \/>\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\/p0504-code-brake-switch-a-b-correlation-code\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0504 Code: Brake Switch A\/B Correlation Code - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what P0504 means, its symptoms, and the most common causes that can trigger this code. Plus find out what to do if your car logs P0504.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0504-code-brake-switch-a-b-correlation-code\/\" \/>\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=\"2022-04-08T07:28:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-08-16T13:08:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/shoe-stepping-on-brake-pedal-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1365\" \/>\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\\\/p0504-code-brake-switch-a-b-correlation-code\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0504-code-brake-switch-a-b-correlation-code\\\/\"},\"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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