{"id":16025,"date":"2022-02-18T02:27:00","date_gmt":"2022-02-18T10:27:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16025"},"modified":"2024-06-05T04:10:11","modified_gmt":"2024-06-05T11:10:11","slug":"p0731-code-gear-1-incorrect-ratio","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0731-code-gear-1-incorrect-ratio\/","title":{"rendered":"P0731 Code: Gear 1 Incorrect Ratio"},"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_bf3540-47 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_bf3540-47 > .kt-inside-inner-col,.kadence-column_bf3540-47 > .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_bf3540-47 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_bf3540-47 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_bf3540-47 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_bf3540-47 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_bf3540-47{position:relative;}@media all and (max-width: 1024px){.kadence-column_bf3540-47 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_bf3540-47 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_bf3540-47 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-c598ee  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-3915f0\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_985356-84, .wp-block-kadence-advancedheading.kt-adv-heading_985356-84[data-kb-block=\"kb-adv-heading_985356-84\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_985356-84 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_985356-84[data-kb-block=\"kb-adv-heading_985356-84\"] 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_985356-84 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_985356-84[data-kb-block=\"kb-adv-heading_985356-84\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_985356-84 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_985356-84\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Diagnostic trouble code (DTC) P0731 stands for &ldquo;Gear 1 Incorrect Ratio.&rdquo; This code implies that the transmission is slipping. The powertrain control module (PCM) detects that the revolutions per minute (RPM) difference between the rotational speed of the two sensors in Gear 1 falls outside the normal range.<\/li><li>Common causes for the P0731 code include a defective gear 1 shift solenoid, internal transmission failure, and a defective speed sensor.<\/li><li>Symptoms of the P0731 code include an illuminated check engine light, the vehicle not shifting properly, and decreased fuel economy.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">One of the <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"diagnostic trouble codes\">diagnostic trouble codes<\/a> that you might encounter is the P0731 code. This is one of the thousands of codes that may be logged by different makes and models. However, the methods for testing and fixing this code may differ among auto manufacturers. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is some generic information about the P0731 code that may help you understand the common triggers and symptoms of this OBD-II code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0731 Code Mean?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Diagnostic trouble code (DTC) P0731 code stands for &ldquo;Gear 1 Incorrect Ratio.&rdquo; This trouble code implies that the transmission is slipping. It may happen while the driver is shifting gears or while driving at steady speeds in the same gear.<\/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\/engine-control-unit-1024x941.jpeg\" alt=\"engine control unit\" class=\"wp-image-16030\" width=\"1024\" height=\"941\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-unit-1024x941.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-unit-300x276.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-unit-768x706.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-unit-150x138.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-control-unit.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The P0731 code is set when the values from the transmission input and output speed sensors do not correlate.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The operation of the transmission and its components is monitored by the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a>(or the <a href=\"https:\/\/www.carparts.com\/transmission-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission control module\">transmission control module<\/a>) with the help of input from various sensors. Two of these sensors are the transmission input speed sensor and the transmission output speed sensor. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The readings from the transmission input and output speed sensors are compared to determine gear ratio and torque converter slip. When the powertrain control module (PCM) detects that the <a href=\"https:\/\/www.carparts.com\/blog\/what-does-car-rpm-stand-for\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"RPM\">RPM<\/a> difference between the rotational speed of the two sensors in Gear 1 falls outside the normal range, the P0731 code is set.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you&rsquo;re planning to fix P0731 yourself, our technical discussion about <a href=\"https:\/\/www.carparts.com\/blog\/p0734-code-gear-4-incorrect-ratio\/#OBD_Codes_and_Gear_Ratios\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD codes and gear ratios\">OBD codes and gear ratios<\/a> can help you come up with a proper solution.<\/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 class=\"wp-block-paragraph\"><em><strong>Note<\/strong>: The definition of code P0731 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 P0731 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Defective Gear 1 Shift Solenoid<\/li><li>Internal transmission failure<\/li><li>Defective <a href=\"https:\/\/www.carparts.com\/speed-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"speed sensor\">speed sensor<\/a><\/li><li>Defective <a href=\"https:\/\/www.carparts.com\/valve-body\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Valve Body\">Valve Body<\/a><\/li><li>Dirty transmission fluid that restricts the hydraulic passages<\/li><li>Low transmission fluid level<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0731 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=\"Check Engine Light will illuminate\">Check Engine Light will illuminate<\/a><\/li><li>Vehicle will not shift properly<\/li><li>Decrease in fuel economy<\/li><li>Whining noise from the transmission pump<\/li><li>Vehicle stuck in &ldquo;<a href=\"https:\/\/www.carparts.com\/blog\/web-stories\/what-is-limp-mode\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"limp mode\">limp mode<\/a>&rdquo; <\/li><li>Vehicle will not move <\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0731 Code<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Identifying the underlying cause of the P0731 code can be difficult, especially if you&rsquo;re not confident with your automotive knowledge. In most cases, it would be best to bring your vehicle to an auto repair shop and seek the help of a professional for an accurate diagnosis. Otherwise, you should refer to the manufacturer&rsquo;s repair information when troubleshooting this code.<\/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\/difficulty-shifting-gears-1024x682.jpeg\" alt=\"difficulty shifting gears\" class=\"wp-image-16032\" width=\"1024\" height=\"682\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/difficulty-shifting-gears-1024x682.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/difficulty-shifting-gears-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/difficulty-shifting-gears-768x511.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/difficulty-shifting-gears-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/difficulty-shifting-gears-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/difficulty-shifting-gears.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Difficulty changing gears is one of the common symptoms of the P0731 code.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0731 Code<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The P0731 code is a generic trouble code that may apply to various makes and models. While vehicles from different manufacturers may share common symptoms, the steps for diagnosis and repair for a P0731 <a href=\"https:\/\/www.carparts.com\/ford\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Ford\">Ford<\/a>code may differ from a P0731 <a href=\"https:\/\/www.carparts.com\/jeep\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Jeep\">Jeep<\/a>code.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you&rsquo;re an advanced DIYer who&rsquo;d like to fix this code on your own, it will be helpful to refer to your <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual\">repair manual<\/a> or get factory vehicle repair information from an online subscription service or a repair manual.<\/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\/speed-sensor\" target=\"_blank\" aria-label=\"Speed Sensor\" 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\/repd313301_1\" alt=\"Speed Sensor\">\n<strong>Speed Sensor<\/strong>\n<\/a>\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\/a1721000_1\" alt=\"Engine Control Module\">\n<strong>Engine Control Module<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/valve-body\" target=\"_blank\" aria-label=\"Valve Body\" 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\/ac24264343_1\" alt=\"Valve Body\">\n<strong>Valve Body<\/strong>\n<\/a>\n\n<!-- end of editable content -->\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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>One of the diagnostic trouble codes that you might encounter is the P0731 code. This is one of the thousands&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0731-code-gear-1-incorrect-ratio\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":16026,"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":[1323,1601,1222],"ppma_author":[2607,2985],"class_list":["post-16025","post","type-post","status-publish","format-standard","has-post-thumbnail","category-obd-ii-trouble-codes","tag-engine-control-module-2","tag-speed-sensor-2","tag-transmission-control-module","entry"],"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0731 Code: Gear 1 Incorrect Ratio - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"This guide will help you learn more about the definition, possible causes, and common symptoms of the P0723 diagnostic trouble code.\" \/>\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\/p0731-code-gear-1-incorrect-ratio\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0731 Code: Gear 1 Incorrect Ratio - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"This guide will help you learn more about the definition, possible causes, and common symptoms of the P0723 diagnostic trouble code.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0731-code-gear-1-incorrect-ratio\/\" \/>\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=\"2022-02-18T10:27:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-05T11:10:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/transmission-gears-1024x683.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"683\" \/>\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\\\/p0731-code-gear-1-incorrect-ratio\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0731-code-gear-1-incorrect-ratio\\\/\"},\"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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He has produced a coffee table book of digital watercolors called \u201cMemories of South Alabama\u201d created from his personal photos, along with a dozen Christian fiction short original novels and a collection of short stories, all available in Kindle or softcover format. 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