{"id":16228,"date":"2021-10-22T02:04:00","date_gmt":"2021-10-22T09:04:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16228"},"modified":"2024-06-03T23:23:47","modified_gmt":"2024-06-04T06:23:47","slug":"p0734-code-gear-4-incorrect-ratio","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0734-code-gear-4-incorrect-ratio\/","title":{"rendered":"P0734 Code: Gear 4 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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_074d2a-bd > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_074d2a-bd > .kt-inside-inner-col,.kadence-column_074d2a-bd > .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_074d2a-bd > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_074d2a-bd > .kt-inside-inner-col{flex-direction:column;}.kadence-column_074d2a-bd > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_074d2a-bd > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_074d2a-bd{position:relative;}@media all and (max-width: 1024px){.kadence-column_074d2a-bd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_074d2a-bd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_074d2a-bd qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-eb8ac3  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-c48401\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_647375-26, .wp-block-kadence-advancedheading.kt-adv-heading_647375-26[data-kb-block=\"kb-adv-heading_647375-26\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_647375-26 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_647375-26[data-kb-block=\"kb-adv-heading_647375-26\"] 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_647375-26 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_647375-26[data-kb-block=\"kb-adv-heading_647375-26\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_647375-26 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_647375-26\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P0734 code stands for &ldquo;Gear 4 Incorrect Ratio.&rdquo; It&rsquo;s logged when the PCM detects that the RPM of your input speed sensor doesn&rsquo;t match the expected RPM in 4th gear.<\/li><li>Some possible causes for the code include low transmission fluid, a defective 4th gear shift solenoid, and transmission failure.<\/li><li>A lit check engine light, the inability to shift to 4th gear, transmission slipping, and reduced fuel economy are some of the telltale signs of this trouble code.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>A slipping transmission is never a good sign. Generally, any error in shifting gears warrants a trip to your mechanic. The code P0734 is one of the many <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD-II codes\">OBD-II codes<\/a> related to this issue. If your scan tool reads this code, it pays to know what it means and how to address it.<\/p>\n\n\n\n<p>Below is an informative guide to help you understand code P0734 better.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0734 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0734 stands for &ldquo;Gear 4 Incorrect Ratio.&rdquo; It is triggered once your 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 your input speed sensor and the transmission output speed sensor doesn&rsquo;t match what the ECM\/PCM expects to see in 4th gear.<\/p>\n\n\n\n<p>This error code sometimes indicates that the transmission is slipping. It can happen when your vehicle is shifting to 4th gear or even when driving at steady speeds. It can also mean that the shift to 4th gear never happened for some reason.<\/p>\n\n\n\n<p>If you&rsquo;re planning a DIY solution to code P0734, you should read 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=\"gear ratios\">gear ratios<\/a> for more information. Otherwise, you can read the following section for the most likely causes of P0734.<\/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\/2021\/10\/Hand-holding-the-car-gear-lever-1024x683.jpg\" alt=\"Hand holding the car gear lever\" class=\"wp-image-45268\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/Hand-holding-the-car-gear-lever-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/Hand-holding-the-car-gear-lever-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/Hand-holding-the-car-gear-lever-768x513.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/Hand-holding-the-car-gear-lever-1536x1025.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/Hand-holding-the-car-gear-lever-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/Hand-holding-the-car-gear-lever-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/Hand-holding-the-car-gear-lever-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>P0734 code can happen when your vehicle is shifting to 4th gear or even when driving at steady speeds.<\/figcaption><\/figure>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0734 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 P0734 Code?<\/h2>\n\n\n\n<p>Error code P0734 can be triggered due to several reasons. Here are some of the possible causes of this code:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Low transmission fluid<\/li><li>Defective 4th gear-related shift solenoid<\/li><li>Mechanical failure in the transmission<\/li><li>Malfunctioning transmission control module (rare)<\/li><li>Faulty <a href=\"https:\/\/www.carparts.com\/valve-body\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"valve body\">valve body<\/a><\/li><li>Blocked hydraulic passages due to dirty transmission fluid<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0734 Code?<\/h2>\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\/2021\/10\/check-engine-light-on-as-a-common-symptom-of-issue-1024x678.jpg\" alt=\"check engine light on as a common symptom of issue\" class=\"wp-image-45266\" width=\"1024\" height=\"678\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/check-engine-light-on-as-a-common-symptom-of-issue-1024x678.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/check-engine-light-on-as-a-common-symptom-of-issue-300x199.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/check-engine-light-on-as-a-common-symptom-of-issue-768x509.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/check-engine-light-on-as-a-common-symptom-of-issue-1536x1017.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/check-engine-light-on-as-a-common-symptom-of-issue-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/10\/check-engine-light-on-as-a-common-symptom-of-issue-150x99.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Check engine light flashing is a common symptom of the P0734 code.<\/figcaption><\/figure>\n\n\n\n<p>Here are some of the common symptoms you should watch for in relation to the code:<\/p>\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\">Check engine light<\/a><\/li><li>Inability to shift to 4th gear\/delayed shift<\/li><li>Transmission slipping<\/li><li>Decreased fuel economy<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0734 Code<\/h2>\n\n\n\n<p>Diagnosing code P0734 isn&rsquo;t easy. Since this code can be triggered due to several causes, it may be difficult to pinpoint the underlying fault that is causing it. If you&rsquo;re not well-versed with auto repair, it is best to leave the job to a mechanic.<\/p>\n\n\n\n<p>However, if you have great DIY repair skills, you may handle the task yourself. Consult your manufacturer&rsquo;s repair manual for the diagnostic steps that are fit for your vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0734 Code<\/h2>\n\n\n\n<p>Just like any other diagnostic trouble code, there is no one fix for P0734 that can work for all makes and models. For example, repair steps for a P0734 in Dodge may not be the same for a P0734 in Subaru. Again, if you&rsquo;re not well-versed with auto repair, it is best to take your vehicle to your auto repair shop for proper diagnosis and repair.<\/p>\n\n\n\n<p>If you&rsquo;re determined to fix this code yourself, you can use online auto repair sources and guides to help you identify the repair steps compatible with your make and model. You may get an ALLDATA single-vehicle subscription, which should be useful in fixing this code and other issues with your car you may potentially face in the future.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OBD Codes and Gear Ratios<\/h2>\n\n\n\n<p>The ECM\/PCM knows how fast the output shaft should be spinning in each gear because the gear ratios are written into the algorithms. It watches crankshaft rpm, turbine shaft (transmission input shaft) rpm, and output shaft rpm. It knows what gear it is commanding and as it watches the speed of the engine, the input shaft, and the output shaft, it knows if the gear it has commanded is in play.<\/p>\n\n\n\n<p>You might notice the same thing watching the tach on the dash. You can tell when the transmission shifts by watching the tach and the speedometer. If, for example, you&rsquo;re accustomed to seeing 1500 rpm at 50 mph on your particular vehicle with a steady throttle but suddenly you notice that the tach is showing 2400 rpm at 50 mph under the same conditions, you know 4th gear never engaged or that the clutches for that gear are slipping.<\/p>\n\n\n\n<p>Automatic transmissions use multiple gear ratios to manipulate engine output. Your vehicle&rsquo;s <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> (PCM) or <a href=\"https:\/\/www.carparts.com\/transmission-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission control module\">transmission control module<\/a> (TCM) uses the data, such as information regarding throttle position vs. vehicle speed, to determine when to shift up and down between gears.<\/p>\n\n\n\n<p>The data collected from different sensors are also used to check if all transmission components are working as they should. For example, the engine speed is typically calculated against the transmission speed sensor. This data is used to analyze gear ratio and detect torque converter slip.<\/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>Once your PCM detects that the data does not match the expected value, it will most likely trigger DTC P0734 and illuminate the check engine light.<\/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\/automatic-transmission-fluid\" target=\"_blank\" aria-label=\"Automatic Transmission Fluid\" 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\/fbi29449_1\" alt=\"Automatic Transmission Fluid\">\n<strong>Automatic Transmission Fluid<\/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\/transmission-control-module\" target=\"_blank\" aria-label=\"MTransmission 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\/ac21693_1\" alt=\"Transmission Control Module\">\n<strong>Transmission 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\/ac96043296_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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>A slipping transmission is never a good sign. Generally, any error in shifting gears warrants a trip to your mechanic&#8230;. <a href=\"https:\/\/www.carparts.com\/blog\/p0734-code-gear-4-incorrect-ratio\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":16231,"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":[1898,1221,1323,1601,1222],"ppma_author":[2607,2985],"class_list":{"0":"post-16228","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-automatic-transmission-shift-kit","9":"tag-automatic-transmission-solenoid","10":"tag-engine-control-module-2","11":"tag-speed-sensor-2","12":"tag-transmission-control-module","13":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0734 Code: Gear 4 Incorrect Ratio - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn more about the meaning of the diagnostic trouble code P0734, its possible triggers, and the common symptoms related to it.\" \/>\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\/p0734-code-gear-4-incorrect-ratio\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0734 Code: Gear 4 Incorrect Ratio - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn more about the meaning of the diagnostic trouble code P0734, its possible triggers, and the common symptoms related to it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0734-code-gear-4-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=\"2021-10-22T09:04:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-04T06:23:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/transmission-cross-section-car-1024x679.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"679\" \/>\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=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0734-code-gear-4-incorrect-ratio\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0734-code-gear-4-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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