{"id":77608,"date":"2022-11-14T16:57:46","date_gmt":"2022-11-15T00:57:46","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=77608"},"modified":"2024-12-17T18:23:55","modified_gmt":"2024-12-18T02:23:55","slug":"p0729-code-gear-6-incorrect-ratio","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0729-code-gear-6-incorrect-ratio\/","title":{"rendered":"P0729 Code: Gear 6 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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column77608_54c960-c5 > .kt-inside-inner-col,.kadence-column77608_54c960-c5 > .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-column77608_54c960-c5 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column77608_54c960-c5 > .kt-inside-inner-col{flex-direction:column;}.kadence-column77608_54c960-c5 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column77608_54c960-c5 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column77608_54c960-c5{position:relative;}@media all and (max-width: 1024px){.kadence-column77608_54c960-c5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column77608_54c960-c5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column77608_54c960-c5 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-269539  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-ef92bb\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading77608_ae5137-55, .wp-block-kadence-advancedheading.kt-adv-heading77608_ae5137-55[data-kb-block=\"kb-adv-heading77608_ae5137-55\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading77608_ae5137-55 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading77608_ae5137-55[data-kb-block=\"kb-adv-heading77608_ae5137-55\"] 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-heading77608_ae5137-55 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading77608_ae5137-55[data-kb-block=\"kb-adv-heading77608_ae5137-55\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading77608_ae5137-55 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading77608_ae5137-55\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Code P0729 is set once the calculation based on data transmitted by sensors to the transmission control module falls outside the desired range.<\/li>\n\n\n\n<li>The common causes of a P0729 code include a bad TCM, a failed transmission valve body, and a wiring issue.<\/li>\n\n\n\n<li>The common symptoms of a P0729 code include poor fuel economy and incorrect transmission shifting.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>In automatic transmission vehicles, 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) 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) monitors the operation of the transmission and its components. It relies on input from various sensors. If the PCM detects an issue in the transmission, particularly in gear shifting, it might log a P0729 error code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0729 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) P0729 stands for &ldquo;Gear 6 Incorrect Ratio.&rdquo; The code is set once it is determined that the transmission is not in the desired gear.<\/p>\n\n\n\n<p>Automatic transmissions shift gears using clutches to hold several elements of two or more planetary gear sets with varying gear ratios. Torque converters are used between the engine and transmission to increase engine torque and drive the rear wheels.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"684\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts-1024x684.jpg\" alt=\"automatic transmission moving parts\" class=\"wp-image-77930\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts-1024x684.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts-768x513.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts-1536x1025.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/automatic-transmission-moving-parts.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Most modern transmissions have multiple planetary gearsets and even share gears among themselves.<\/figcaption><\/figure>\n\n\n\n<p>Newer vehicles often have more than four gear ratios for better fuel economy. The control modules also determine when to shift up or down between gears depending on various data, such as throttle position and vehicle speed.<\/p>\n\n\n\n<p>The TCM uses data from various sensors to keep track of the transmission&rsquo;s performance. For example, gear ratio and torque converter slip are determined by comparing engine speed to the transmission speed sensor. Code P0729 will be set if the calculation falls far from the desired range.<\/p>\n\n\n\n<p>Driving with this trouble code isn&rsquo;t recommended. So have your vehicle inspected by a trusted mechanic right away once your OBD scan tool retrieves this code.<\/p>\n\n\n\n<p>For a more technical understanding of P0729, read our advanced discussion about <a href=\"#An_In-Depth_Look_at_the_Planetary_Gearset\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"planetary gearsets\">planetary gearsets<\/a>.<\/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><strong><em>Note:<\/em><\/strong><em> The definition of code P0729 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 P0729 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bad TCM<\/li>\n\n\n\n<li>Internal transmission failure<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/how-to-check-automatic-transmission-fluid\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Low transmission fluid\">Low transmission fluid<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/transmission-valve-body-what-it-is-how-it-works-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Failed transmission valve body\">Failed transmission valve body<\/a><\/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> problem<\/li>\n\n\n\n<li>Internal transmission failure<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0729 Code?<\/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\/11\/car-transmission-shifting-issue-1024x683.jpg\" alt=\"car transmission shifting issue\" class=\"wp-image-77928\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-transmission-shifting-issue-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-transmission-shifting-issue-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-transmission-shifting-issue-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-transmission-shifting-issue-1536x1025.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-transmission-shifting-issue-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-transmission-shifting-issue-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-transmission-shifting-issue-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/car-transmission-shifting-issue.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Improper transmission shifting is a common symptom of P0729 code.<\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor fuel economy<\/li>\n\n\n\n<li>Improper transmission shifting<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose a P0729 Code<\/h2>\n\n\n\n<p>P0729 is a generic code, but that doesn&rsquo;t mean that there&rsquo;s only one way to determine what&rsquo;s causing it. The process tends to vary depending on the vehicle, so it&rsquo;s best to take your vehicle to a professional for a proper diagnosis.<\/p>\n\n\n\n<p>On the other hand, if you have the tools and know-how to diagnose code P0729, you can go ahead and do it yourself.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix a P0729 Code<\/h2>\n\n\n\n<p>Troubleshooting error codes can be tricky, and the P0729 error code is no exception. If you attempt to solve the problem on your own without the right tools or knowledge, you&rsquo;ll risk making the issue worse. So it&rsquo;s best to let a professional clear the code for you.<\/p>\n\n\n\n<p>However, if you&rsquo;re a seasoned auto repair DIYer, you can go ahead and resolve the code yourself. Before you begin, make sure to read the appropriate manual or consult an online repair database for vehicle-specific repair information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">An In-Depth Look at the Planetary Gearset<\/h2>\n\n\n\n<p>The heart of the automatic transmission (except on chain-type continuous variable units) is the planetary gear set. There are multiple planetary gearsets in most newer transmissions.<\/p>\n\n\n\n<p>The planetary gearset in its basic form consists of a sun gear, a ring gear, and planet gears in between, with the planet gears spinning on shafts connected to a &ldquo;planet carrier.&rdquo;<\/p>\n\n\n\n<p>Holding the planet gear carrier stationary while driving the sun gear will spin the ring gear backwards. That&rsquo;s basically how reverse works. Holding the sun gear while driving the ring gear provides one gear, and holding the ring gear while driving the sun gear provides yet another range. Holding the sun gear while driving the planet carrier provides yet another gear.<\/p>\n\n\n\n<p>Most modern transmissions have multiple planetary gearsets and even share gears among themselves.<\/p>\n\n\n\n<p>The way the different elements are held or driven depends on hydraulic application of clutches and &ldquo;holding members&rdquo; that work like brakes. These driving and holding members are connected to the various elements. There are also one-way clutches usually called &ldquo;sprag&rdquo; or &ldquo;roller&rdquo; type clutches that are purely mechanical.<\/p>\n\n\n\n<p>The hydraulics that apply the holding members (brakes) and driving clutches are controlled by spool valves in the valve body along with solenoids that control line pressure and either trap or release pressure from various channels.<\/p>\n\n\n\n<p>Gear selection is made with a large manually operated spool valve that is connected to the shift linkage to determine the gear range selected by the driver. Park engages a large locking device called a &ldquo;pawl&rdquo; in a heavy gear to prevent the output shaft from turning.<\/p>\n\n\n\n<p>Older transmissions had a mechanical governor and an output sensor to drive the speedometer cable. Newer transmissions are electronically controlled by the PCM or TCM.<\/p>\n\n\n\n<p>You can learn more about how codes like P0729 are set in our technical discussion about gear ratios.<\/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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>In automatic transmission vehicles, the powertrain control module (PCM) or transmission control module (TCM) monitors the operation of the transmission&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0729-code-gear-6-incorrect-ratio\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":77929,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"_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":[3617,3618,1686,1323,1215,1222,3168],"ppma_author":[2607,2985],"class_list":{"0":"post-77608","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-input-shaft","9":"tag-automatic-transmission-output-shaft","10":"tag-crankshaft","11":"tag-engine-control-module-2","12":"tag-torque-converter","13":"tag-transmission-control-module","14":"tag-valve-body","15":"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>P0729 Code: Gear 6 Incorrect Ratio - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Read on to find out what a P0729 code means and what could happen to your vehicle if you leave it unresolved.\" \/>\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\/p0729-code-gear-6-incorrect-ratio\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0729 Code: Gear 6 Incorrect Ratio - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Read on to find out what a P0729 code means and what could happen to your vehicle if you leave it unresolved.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0729-code-gear-6-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=\"2022-11-15T00:57:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-12-18T02:23:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/driver-on-road-transmission-shifting.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1335\" \/>\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=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0729-code-gear-6-incorrect-ratio\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0729-code-gear-6-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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