{"id":106378,"date":"2024-05-16T02:31:39","date_gmt":"2024-05-16T09:31:39","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=106378"},"modified":"2024-08-03T09:27:50","modified_gmt":"2024-08-03T16:27:50","slug":"how-to-test-a-speed-sensor","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/how-to-test-a-speed-sensor\/","title":{"rendered":"How To Test a Speed Sensor"},"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-column106378_bc033e-a5 > .kt-inside-inner-col,.kadence-column106378_bc033e-a5 > .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-column106378_bc033e-a5 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column106378_bc033e-a5 > .kt-inside-inner-col{flex-direction:column;}.kadence-column106378_bc033e-a5 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column106378_bc033e-a5 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column106378_bc033e-a5{position:relative;}@media all and (max-width: 1024px){.kadence-column106378_bc033e-a5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column106378_bc033e-a5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column106378_bc033e-a5 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-c8a2f3  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-b1d70a\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading106378_ec25ec-a2, .wp-block-kadence-advancedheading.kt-adv-heading106378_ec25ec-a2[data-kb-block=\"kb-adv-heading106378_ec25ec-a2\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading106378_ec25ec-a2 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading106378_ec25ec-a2[data-kb-block=\"kb-adv-heading106378_ec25ec-a2\"] 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-heading106378_ec25ec-a2 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading106378_ec25ec-a2[data-kb-block=\"kb-adv-heading106378_ec25ec-a2\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading106378_ec25ec-a2 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading106378_ec25ec-a2\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Troubleshooting a faulty transmission sensor requires you to find the sensor, remove it from the transmission, and test it using the right tool for that particular sensor.<\/li>\n\n\n\n<li>If your vehicle&rsquo;s onboard diagnostics system has stored a trouble code related to the speed sensor, you can skip testing the sensor and replace it immediately.<\/li>\n\n\n\n<li>Transmission speed sensors let the powertrain control module (PCM) monitor transmission shaft speeds and change transmission gears accordingly.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>If your vehicle&rsquo;s automatic transmission has jerky gear changes or erratic shifting, then it could be due to a faulty transmission speed sensor. If ignored, this can cause excessive fuel consumption or even transmission damage (although this is rare). In this article, we&rsquo;ll discuss how the <a href=\"https:\/\/www.carparts.com\/automatic-transmission-speed-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission speed sensor\">transmission speed sensor<\/a> works and share some tips to help you determine whether it&rsquo;s causing your vehicle&rsquo;s problems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How To Test a Transmission Speed Sensor<\/h2>\n\n\n\n<p>Testing a transmission speed sensor involves several important steps. If the scan tool you&rsquo;re using provides datastream information on the sensors in question, this may be the only tool you need.<\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/what-does-service-4wd-mean-triggers-how-to-clear-and-more\/\" target=\"_self\" rel=\"dofollow\" class=\"ubedd6f1dca3eafb23dea3cbf230027e8\"><style> .ubedd6f1dca3eafb23dea3cbf230027e8 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .ubedd6f1dca3eafb23dea3cbf230027e8:active, .ubedd6f1dca3eafb23dea3cbf230027e8:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .ubedd6f1dca3eafb23dea3cbf230027e8 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .ubedd6f1dca3eafb23dea3cbf230027e8 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .ubedd6f1dca3eafb23dea3cbf230027e8 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .ubedd6f1dca3eafb23dea3cbf230027e8:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">What Does Service 4WD Mean? Triggers, How to Clear, and More<\/span><\/div><\/a><\/div><\/div>\n\n\n<style>.kadence-column106378_6786df-98 > .kt-inside-inner-col,.kadence-column106378_6786df-98 > .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-column106378_6786df-98 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column106378_6786df-98 > .kt-inside-inner-col{flex-direction:column;}.kadence-column106378_6786df-98 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column106378_6786df-98 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column106378_6786df-98{position:relative;}@media all and (max-width: 1024px){.kadence-column106378_6786df-98 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column106378_6786df-98 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column106378_6786df-98 kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id106378_992266-a6 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id106378_992266-a6 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id106378_992266-a6 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id106378_992266-a6 > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id106378_992266-a6 .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id106378_992266-a6 .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id106378_992266-a6 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id106378_992266-a6 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id106378_992266-a6 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id106378_992266-a6 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id106378_992266-a6 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id106378_992266-a6 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id106378_992266-a6 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id106378_992266-a6 > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id106378_992266-a6 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id106378_992266-a6 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id106378_992266-a6 alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column106378_4df4cd-5c > .kt-inside-inner-col{display:flex;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col{min-height:45px;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col,.kadence-column106378_4df4cd-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-column106378_4df4cd-5c > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col > *, .kadence-column106378_4df4cd-5c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column106378_4df4cd-5c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column106378_4df4cd-5c{position:relative;}@media all and (max-width: 1024px){.kadence-column106378_4df4cd-5c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column106378_4df4cd-5c > .kt-inside-inner-col > *, .kadence-column106378_4df4cd-5c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column106378_4df4cd-5c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column106378_4df4cd-5c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col > *, .kadence-column106378_4df4cd-5c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column106378_4df4cd-5c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column106378_4df4cd-5c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column106378_4df4cd-5c kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image106378_49d95b-a8.kb-image-is-ratio-size, .kb-image106378_49d95b-a8 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image106378_49d95b-a8.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image106378_49d95b-a8 .kb-image-is-ratio-size{align-self:unset;}.kb-image106378_49d95b-a8 figure{max-width:45px;}.kb-image106378_49d95b-a8 .image-is-svg, .kb-image106378_49d95b-a8 .image-is-svg img{width:100%;}.kb-image106378_49d95b-a8 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image106378_49d95b-a8\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column106378_af2f95-ef > .kt-inside-inner-col,.kadence-column106378_af2f95-ef > .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-column106378_af2f95-ef > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column106378_af2f95-ef > .kt-inside-inner-col{flex-direction:column;}.kadence-column106378_af2f95-ef > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column106378_af2f95-ef > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column106378_af2f95-ef{position:relative;}@media all and (max-width: 1024px){.kadence-column106378_af2f95-ef > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column106378_af2f95-ef > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column106378_af2f95-ef inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\n            If you aren&rsquo;t getting a reading or if the reading you&rsquo;re getting is intermittent, you may have a wire harness concern to track down or you may have a pin fit issue in a connector somewhere in the circuit.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Diagnosing With a Scan Tool<\/h3>\n\n\n\n<p>Use a scan tool to check for error codes related to the transmission speed sensor, and again, check the sensor using the datastream. If the scan tool shows these codes and the datastream indicates intermittent, skewed output, or no output, then you&rsquo;ll need to replace the sensor if the circuits check out. However, if there aren&rsquo;t any codes present, you&rsquo;ll need to diagnose the issue by testing the sensor and ruling it out of the equation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Locating the Transmission Speed Sensor<\/h3>\n\n\n\n<p>Where is the transmission speed sensor located? This will require research to make sure you aren&rsquo;t working on the wrong sensor. There is no pat answer that will help you find the sensor on just any and every vehicle, but you can find the location of the sensor on your vehicle online.<\/p>\n\n\n\n<p>But as an example, on some Hyundai vehicles like the <a href=\"https:\/\/www.carparts.com\/automatic-transmission-speed-sensor\/hyundai\/elantra\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Elantra\">Elantra<\/a>, the sensor will be located behind the valve body, which requires you to drain the vehicle&rsquo;s <a href=\"https:\/\/www.carparts.com\/blog\/what-is-transmission-fluid-and-other-faqs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission fluid\">transmission fluid<\/a> and get the valve body out of the way. You&rsquo;ll only see the wiring harness and speed sensors once the valve body has been removed.<\/p>\n\n\n\n<p>Meanwhile, a 2001 to 2005 <a href=\"https:\/\/www.carparts.com\/automatic-transmission-speed-sensor\/ford\/explorer\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Ford Explorer&rsquo;s speed sensor\">Ford Explorer&rsquo;s speed sensor<\/a> is accessible from outside the transmission case. To reach it, you&rsquo;ll need to raise your vehicle and look for the <a href=\"https:\/\/www.carparts.com\/wiring-harness\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wiring harness\">wiring harness<\/a> outside the transmission case. The wiring harness will lead to the speed sensor located on top of the transmission case.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Disconnecting the Sensor<\/h3>\n\n\n\n<p>You&rsquo;ll need a socket wrench to remove the transmission speed sensors that are bolted onto their mounting point.<\/p>\n\n\n\n<p>After the bolt is removed, use some elbow grease to free the sensor. Sometimes, you&rsquo;ll need to gently pry it out using pliers. Be careful when you do this, because some fluid can leak out from where the sensor is inserted.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"802\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/1990s-ford-f150-output-shaft-sensor-1024x802.jpg\" alt=\"image of a 1990s ford f150 output shaft sensor\" class=\"wp-image-108797\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/1990s-ford-f150-output-shaft-sensor-1024x802.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/1990s-ford-f150-output-shaft-sensor-300x235.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/1990s-ford-f150-output-shaft-sensor-768x602.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/1990s-ford-f150-output-shaft-sensor-150x118.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/1990s-ford-f150-output-shaft-sensor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">An output shaft sensor on a late 1990s F150. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Testing a Transmission Speed Sensor<\/h3>\n\n\n\n<p>If you can get to the sensor terminals, you don&rsquo;t have to remove the sensor to test it. You can unplug the sensor and measure the resistance if it&rsquo;s a variable reluctance sensor with a copper winding and a magnet. You can measure the output of the sensor as AC voltage.<\/p>\n\n\n\n<p><em><strong>Caution:<\/strong> Don&rsquo;t do this if you don&rsquo;t know how, and don&rsquo;t ever work on any vehicle that isn&rsquo;t properly and safely supported.<\/em><\/p>\n\n\n\n<p>If it&rsquo;s a Hall Effect sensor, you&rsquo;ll need to use a scope rather than measuring the sensor resistance. A scope is something that&rsquo;s not usually available in a DIY garage.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"702\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/hall-effect-sensor-and-variable-reluctance-speed-sensor-diagram-1-1024x702.jpg\" alt=\"diagram of a hall effect sensor and variable reluctance speed sensor\" class=\"wp-image-108799\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/hall-effect-sensor-and-variable-reluctance-speed-sensor-diagram-1-1024x702.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/hall-effect-sensor-and-variable-reluctance-speed-sensor-diagram-1-300x206.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/hall-effect-sensor-and-variable-reluctance-speed-sensor-diagram-1-768x526.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/hall-effect-sensor-and-variable-reluctance-speed-sensor-diagram-1-150x103.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/hall-effect-sensor-and-variable-reluctance-speed-sensor-diagram-1.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Diagram showing how to test a variable reluctance speed sensor and Hall Effect sensor | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Inspecting the Wiring Harness<\/h3>\n\n\n\n<p>The wiring that connects to the sensor is equally important. Inspect the wiring for any fraying, damage, or exposed conductors. Damaged wiring can also compromise the sensor&rsquo;s function, so you&rsquo;ll need to replace the wiring for the sensor to give accurate readings.<\/p>\n\n\n\n<p>Troubleshooting a faulty transmission speed sensor can be a difficult task, especially if you aren&rsquo;t familiar with your vehicle&rsquo;s transmission or with the various different types of sensors. If you have trouble following the diagnostic steps in this article, we recommend you leave the task to a professional.<\/p>\n\n\n\n<link rel=\"stylesheet\" href=\"https:\/\/fonts.googleapis.com\/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@24,100,0,0\">\n<link rel=\"stylesheet\" href=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/OwlCarousel2\/2.3.4\/assets\/owl.carousel.min.css\">\n<link rel=\"stylesheet\" href=\"https:\/\/www.carparts.com\/blog\/wp-content\/themes\/genesis_child\/custom\/widgets\/customer-reviews\/assets\/css\/styles.css?v1.0.23\">\n\n<section class=\"customer-reviews-banner\">\n    <div class=\"crb-flex\">\n\n        <div class=\"owl-carousel crb-carousel\">\n            <div><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/v1714710789\/carparts\/blog\/widgets\/customer-reviews\/customer-reviews-01\" alt=\"first customer reviews screenshot\"><\/div>\n            <div><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/v1714710789\/carparts\/blog\/widgets\/customer-reviews\/customer-reviews-02\" alt=\"second customer reviews screenshot\"><\/div>\n            <div><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/v1714710789\/carparts\/blog\/widgets\/customer-reviews\/customer-reviews-03\" alt=\"third customer reviews screenshot\"><\/div>\n            <div><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/v1714710789\/carparts\/blog\/widgets\/customer-reviews\/customer-reviews-04\" alt=\"fourth customer reviews screenshot\"><\/div>\n            <div><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/v1714710789\/carparts\/blog\/widgets\/customer-reviews\/customer-reviews-05\" alt=\"fifth customer reviews screenshot\"><\/div>\n            <div><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/v1714710789\/carparts\/blog\/widgets\/customer-reviews\/customer-reviews-06\" alt=\"sixth customer reviews screenshot\"><\/div>\n            <div><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/v1714710789\/carparts\/blog\/widgets\/customer-reviews\/customer-reviews-07\" alt=\"seventh customer reviews screenshot\"><\/div>\n            <div><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/v1714710789\/carparts\/blog\/widgets\/customer-reviews\/customer-reviews-08\" alt=\"eight customer reviews screenshot\"><\/div>\n        <\/div>\n\n        <div class=\"crb-details\">\n            <span>Thousands of happy customers choose CarParts.com.<\/span>\n            <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n        <\/div>\n    <\/div>\n\n<\/section>\n\n<script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/OwlCarousel2\/2.3.4\/owl.carousel.min.js\"><\/script>\n<script src=\"https:\/\/www.carparts.com\/blog\/wp-content\/themes\/genesis_child\/custom\/widgets\/customer-reviews\/assets\/js\/script.js?v1.0.0\"><\/script>\n\n\n\n<h2 class=\"wp-block-heading\">What Does a Transmission Speed Sensor Do?<\/h2>\n\n\n\n<p>Electronic transmissions are usually equipped with multiple transmission speed sensors that report to the ECM\/PCM\/TCM how fast the input and output shafts of the transmission are spinning. The torque converter turbine is splined to the transmission input shaft, also known as the &ldquo;turbine shaft.&rdquo;<\/p>\n\n\n\n<p>The transmission input speed sensor measures the speed of the input (turbine) shaft, which transfers power from the engine to the transmission. The output speed sensor measures the speed of the output shaft, which connects the transmission to either the differential on front wheel drive vehicles or the driveshaft on rear wheel drive vehicles.<\/p>\n\n\n\n<p>Some transmissions may have a speed sensor for one or more of the transmission&rsquo;s internal intermediate shafts as well, so the number of sensors varies widely from platform to platform.<\/p>\n\n\n\n<p>The ECM or TCM knows how fast each shaft should be spinning in each gear, factoring in the speed of the turbine shaft and whether or not the torque converter is modulating, locked, or spinning freely. The gear ratios and the different shaft speeds corresponding with these ratios are written into the computer&rsquo;s algorithms for feedback and comparison.<\/p>\n\n\n\n<p>The control module (ECM\/TCM\/PCM) compares crankshaft rpm, turbine shaft (transmission input shaft) rpm, intermediate shaft where equipped, and output shaft rpm. It knows what gear it is commanding and it knows if the gear it has commanded is in play based on input from the sensors.<\/p>\n\n\n\n<p>Transmission shaft speed sensors can be inductive sensors (magnet with a wire coil surrounding it) that produces an AC analog wave, or the sensor can be digital (Hall Effect) that produces a square wave. The sensor typically reads steel teeth moving past the sensor as the shaft spins.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Getting Your Hands on a New Speed Sensor<\/h2>\n\n\n\n<p>If you&rsquo;ve tested your speed sensor and learned that it&rsquo;s indeed been rendered inoperative, it&rsquo;s important to do two things: find the source of the problem and replace the speed sensor as soon as possible.<\/p>\n\n\n\n<p>Replacing a bad speed sensor is crucial because driving with one can lead to many problems. For example, without a functional speed sensor, you won&rsquo;t be able to know how fast your vehicle is going. The anti-lock braking system also won&rsquo;t activate properly, putting you in active danger every time you drive.<\/p>\n\n\n\n<p>Finding a <a href=\"https:\/\/www.carparts.com\/speed-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"replacement speed sensor\">replacement speed sensor<\/a> that&rsquo;s compatible with your vehicle can be tricky. Fortunately, <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a> is here to help.<\/p>\n\n\n\n<p>The best part? You don&rsquo;t need to leave your home to get a new sensor. Simply input your ride&rsquo;s details into our vehicle selector tool to view direct-fit parts, then use the search filters to find the ones that match your preferred price, brand, and specs. Place your order, and wait for it to arrive at your doorstep&mdash;it&rsquo;s that easy!<\/p>\n\n\n\n<p>Our auto parts are carefully selected by a team of professionals to guarantee both quality and longevity. You won&rsquo;t have to worry about your new speed sensor failing you any time soon.<\/p>\n\n\n\n<p>Don&rsquo;t put yourself at risk by driving without an operative speed sensor. Shop now to get your hands on a replacement that&rsquo;s built to last with CarParts.com.<\/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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>If your vehicle&rsquo;s automatic transmission has jerky gear changes or erratic shifting, then it could be due to a faulty&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/how-to-test-a-speed-sensor\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":106518,"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":[52,3748],"tags":[3615],"ppma_author":[2607,2985],"class_list":{"0":"post-106378","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-transmission","9":"tag-automatic-transmission-speed-sensor","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>How To Test a Speed Sensor - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Transmission speed sensors are crucial, so it\u2019s important that they work well. Learn how to test a transmission speed sensor 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\/how-to-test-a-speed-sensor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Test a Speed Sensor - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Transmission speed sensors are crucial, so it\u2019s important that they work well. 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