{"id":74143,"date":"2022-10-09T23:23:09","date_gmt":"2022-10-10T06:23:09","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=74143"},"modified":"2024-01-20T00:24:02","modified_gmt":"2024-01-20T08:24:02","slug":"p0503-code-vehicle-speed-sensor-a-intermittent-erratic-high","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0503-code-vehicle-speed-sensor-a-intermittent-erratic-high\/","title":{"rendered":"P0503 Code: Vehicle Speed Sensor &#8220;A&#8221; Intermittent\/Erratic\/High"},"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_004e21-44 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_004e21-44 > .kt-inside-inner-col,.kadence-column_004e21-44 > .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_004e21-44 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_004e21-44 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_004e21-44 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_004e21-44 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_004e21-44{position:relative;}@media all and (max-width: 1024px){.kadence-column_004e21-44 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_004e21-44 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_004e21-44 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-ed5c0e  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-85040a\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_f26526-5a, .wp-block-kadence-advancedheading.kt-adv-heading_f26526-5a[data-kb-block=\"kb-adv-heading_f26526-5a\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_f26526-5a mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_f26526-5a[data-kb-block=\"kb-adv-heading_f26526-5a\"] 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_f26526-5a img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_f26526-5a[data-kb-block=\"kb-adv-heading_f26526-5a\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_f26526-5a summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_f26526-5a\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P0503 code stands for &ldquo;Vehicle Speed Sensor &ldquo;A&rdquo; Intermittent\/Erratic\/High.&rdquo;<\/li><li>This code may be logged when the PCM doesn&rsquo;t get the right response from the speed sensor and when the latter is underperforming or making noise.<\/li><li>Some possible causes include problems with the PCM or other modules, short or open wire leading to VSS or issues with the connectors, or if the PCM isn&rsquo;t configured for the size of the used tire.<\/li><li>Symptoms to look out for include an illuminated check engine light, a malfunctioning speedometer, and erratic shifting with an automatic transmission.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/speed-sensor?&amp;itemsperpage=15&amp;refinements%5Bpart%5D=Speed_Sensor&amp;refinements%5Btype%5D=Vehicle_speed_sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vehicle speed sensor\">vehicle speed sensor<\/a> (VSS) keeps track of how fast the vehicle is going. It sends its readings to the speedometer and 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). The PCM uses the speed reading to adjust various processes. VSS data also goes to the control modules that run important systems such as the transmission, ABS traction control, and power steering.<\/p>\n\n\n\n<p>&nbsp;If the VSS is underperforming or making noise, the PCM will log a P0503 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does P0503 Mean?<\/h2>\n\n\n\n<p>The <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) P0503 indicates &ldquo;Vehicle Speed Sensor &ldquo;A&rdquo; Intermittent\/Erratic\/High.&rdquo;<\/p>\n\n\n\n<p>Other names for this DTC code include:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Vehicle Speed Sensor (VSS) Malfunction<\/li><li>Vehicle Speed Sensor &ldquo;A&rdquo; Range\/Performance<\/li><li>Vehicle Speed Sensor &ldquo;A&rdquo; Low Input<\/li><\/ul>\n\n\n\n<p>Depending on the design of the vehicle and its VSS, the vehicle speed sensor may be found on the <a href=\"https:\/\/www.carparts.com\/differential\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"differential\">differential<\/a>, speedometer head, <a href=\"https:\/\/www.carparts.com\/transmission-assembly\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission\">transmission<\/a>, or transaxle.<\/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\/09\/vehicle-speed-sensor-vss-replacement-part-1024x681.jpg\" alt=\"vehicle speed sensor vss replacement part\" class=\"wp-image-74295\" width=\"1024\" height=\"681\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/vehicle-speed-sensor-vss-replacement-part-1024x681.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/vehicle-speed-sensor-vss-replacement-part-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/vehicle-speed-sensor-vss-replacement-part-768x511.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/vehicle-speed-sensor-vss-replacement-part-1536x1022.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/vehicle-speed-sensor-vss-replacement-part-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/vehicle-speed-sensor-vss-replacement-part-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/vehicle-speed-sensor-vss-replacement-part.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The vehicle speed sensor (VSS) keeps track of how fast the vehicle is going.<\/figcaption><\/figure>\n\n\n\n<p>Most VSS calculate the vehicle&rsquo;s speed based on the speed of the transmission output shaft. Some sensors measure the differential gear&rsquo;s speed or use the readings provided by the wheel speed sensors. No matter where the vehicle speed signal comes from, the VSS gives real-time data on how fast the vehicle is going.<\/p>\n\n\n\n<p>The PCM regularly checks the vehicle speed sensor. If the computer doesn&rsquo;t get the right response from the sensor, it will set the generic powertrain code P0503.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code P0503 can differ according to the vehicle manufacturer. Check 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 P0503 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Problem with the PCM\">Problem with the PCM<\/a> or other module<\/li><li>Short or open wire leading to VSS or issues with connectors<\/li><li>PCM not configured for the tire size being used (this won&rsquo;t usually set a P0500)<\/li><li>Damaged drive gear<\/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 P0503 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>Malfunctioning <a href=\"https:\/\/www.carparts.com\/speedometer\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"speedometer\">speedometer<\/a><\/li><li>Erratic shifting with an automatic transmission<\/li><li>Inactive or erratic ABS performance<\/li><li>Traction control not engaging or engaging when it shouldn&rsquo;t<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0503 Code<\/h2>\n\n\n\n<p>The P0503 code is a generic powertrain code that various makes and models can log. However, this does not mean that there is a one-size-fits-all solution to identify its underlying problem.<\/p>\n\n\n\n<p>If you&rsquo;re not confident about conducting diagnostic tests on your vehicle, it&rsquo;s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here is a video that can give you an idea of what the 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=\"Ford P0503 P0720 P0722 - Alternator AC Ripple Test\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/WnVpaWjbuEc?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 P0503 Code<\/h2>\n\n\n\n<p>Attempting to fix a P0503 code can become a challenging task if you don&rsquo;t have the right tools and know-how to test the vehicle speed sensor. In most cases, it&rsquo;s best to leave the job to professionals.<\/p>\n\n\n\n<p>For DIYers with advanced technical knowledge and hands-on experience who prefer to test and replace their vehicle&rsquo;s vehicle speed sensors on their own, it will be helpful to rely on the appropriate <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 refer to an online repair database\">repair manual or refer to an online repair database<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get Replacement Parts to Fix Code P0503<\/h2>\n\n\n\n<p>A damaged <a href=\"https:\/\/www.carparts.com\/speedometer-drive-gear\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"drive gear\">drive gear<\/a> is one of the common issues that can cause the PCM to log this trouble code. Fortunately, it&rsquo;s not too difficult to find a replacement that&rsquo;s compatible with your vehicle at <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>Simply enter your ride&rsquo;s year, make, and model into our vehicle selector after searching for the part you need to narrow down the results to compatible products. Then, choose from our wide selection of replacement parts that come at competitive prices.<\/p>\n\n\n\n<p>The best part? We source our components from the most reliable names in the industry, each carefully selected and vetted by a team of professionals. At CarParts.com, we want you to get the most bang for your buck.<\/p>\n\n\n\n<p>You can place your order online on our website or use our toll-free hotline for further assistance. Our friendly customer service representatives are always happy to help round-the-clock.<\/p>\n\n\n\n<p>Take advantage of our best deals 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 vehicle speed sensor (VSS) keeps track of how fast the vehicle is going. It sends its readings to the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0503-code-vehicle-speed-sensor-a-intermittent-erratic-high\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":74296,"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":[1323,1601],"ppma_author":[2607,2855],"class_list":{"0":"post-74143","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-speed-sensor-2","10":"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>P0503 Code: Vehicle Speed Sensor &quot;A&quot; Intermittent\/Erratic\/High - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what a P0503 code means, the possible causes, and the common symptoms associated with this code in this article.\" \/>\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\/p0503-code-vehicle-speed-sensor-a-intermittent-erratic-high\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0503 Code: Vehicle Speed Sensor &quot;A&quot; Intermittent\/Erratic\/High - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what a P0503 code means, the possible causes, and the common symptoms associated with this code in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0503-code-vehicle-speed-sensor-a-intermittent-erratic-high\/\" \/>\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=\"2022-10-10T06:23:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-01-20T08:24:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/mechanic-encounters-p0503-code-in-obd-diagnostic.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1331\" \/>\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\\\/p0503-code-vehicle-speed-sensor-a-intermittent-erratic-high\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0503-code-vehicle-speed-sensor-a-intermittent-erratic-high\\\/\"},\"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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