{"id":78148,"date":"2025-08-22T18:17:14","date_gmt":"2025-08-22T23:17:14","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78148"},"modified":"2025-08-22T18:17:14","modified_gmt":"2025-08-22T23:17:14","slug":"p0729-obd2-gear-6-incorrect-ratio","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0729-obd2-gear-6-incorrect-ratio","title":{"rendered":"P0729 OBD2: Gear 6 Incorrect Ratio"},"content":{"rendered":"<p>The P0729 code is an OBD-II trouble code that indicates a Gear 6 Incorrect Ratio. This code is triggered when the Transmission Control Module (TCM) detects that the transmission is not engaging the correct gear as expected.<\/p>\n<h2>What Does the P0729 Code Mean?<\/h2>\n<p>OBD-II Code P0729 is defined as a Gear 6 Incorrect Ratio. The TCM relies on inputs from both the Input Speed Sensor and the Output Speed Sensor to determine the correct gear engagement. If there is a discrepancy between these signals, the TCM will set the P0729 code.<\/p>\n<h2>What Causes the P0729 Code?<\/h2>\n<p>Several factors can trigger the P0729 code, including:<\/p>\n<ul>\n<li>Internal transmission failure<\/li>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Transmission Control Module (TCM) failure<\/li>\n<li>Low transmission fluid level<\/li>\n<li>Transmission valve body failure<\/li>\n<li>Wiring issues<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0729 Code?<\/h2>\n<p>Drivers experiencing the P0729 code may notice:<\/p>\n<ul>\n<li>Increased fuel consumption<\/li>\n<li>Transmission may not shift properly<\/li>\n<\/ul>\n<h2>How Serious Is the P0729 Code?<\/h2>\n<p>The P0729 code is considered urgent. It indicates significant malfunctions that can potentially cause severe damage to the vehicle or pose risks to driver and passenger safety. Immediate attention is recommended to prevent further complications.<\/p>\n<h2>How to Diagnose the P0729 Code<\/h2>\n<p>Proper diagnosis of the P0729 code involves a comprehensive approach:<\/p>\n<ol>\n<li>Use an OBD-II scanner to confirm the P0729 code and check for any additional codes.<\/li>\n<li>Inspect the wiring and connectors related to the Input and Output Speed Sensors.<\/li>\n<li>Check the transmission fluid level and condition.<\/li>\n<li>Test the Input Speed Sensor and Output Speed Sensor for proper operation.<\/li>\n<li>Examine the transmission for any internal issues.<\/li>\n<\/ol>\n<h2>Common Repairs for the P0729 Code<\/h2>\n<p>Repairs may include:<\/p>\n<ul>\n<li>Automatic Transmission Fluid\/Filter Change<\/li>\n<li>Replacing faulty Input or Output Speed Sensors<\/li>\n<li>Repairing or replacing wiring and connectors<\/li>\n<li>Fixing internal transmission issues or replacing the TCM<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0729 Code?<\/h2>\n<p>The cost to fix the P0729 code can vary widely based on the specific issue and the make and model of the vehicle. On average, repairs may range from $100 to $1,500, depending on whether it involves simple fluid changes or more complicated repairs such as transmission replacement.<\/p>\n<h2>Can I Fix the P0729 Code Myself?<\/h2>\n<p>While some aspects of diagnosing and fixing the P0729 code can be done by a knowledgeable DIYer, it is recommended to consult with a professional mechanic. Proper diagnosis and repairs require specialized tools and expertise to ensure the problem is accurately identified and resolved.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P0729 code is an OBD-II trouble code that indicates a Gear 6 Incorrect Ratio. This code is triggered when the Transmission Control Module (TCM) detects that the transmission is not engaging the correct gear as expected. What Does the P0729 Code Mean? OBD-II Code P0729 is defined as a Gear 6 Incorrect Ratio. The &hellip;<\/p>\n","protected":false},"author":26,"featured_media":93390,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[11987],"tags":[],"class_list":["post-78148","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-p-obd2-codes-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P0729 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0729 code, what causes gear 6 incorrect ratio, and how to diagnose and fix common issues to maintain optimal engine performance.\" \/>\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.emanualonline.com\/blog\/p0729-obd2-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 OBD2: Gear 6 Incorrect Ratio\" \/>\n<meta property=\"og:description\" content=\"The P0729 code is an OBD-II trouble code that indicates a Gear 6 Incorrect Ratio. This code is triggered when the Transmission Control Module (TCM)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0729-obd2-gear-6-incorrect-ratio\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/jee514\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-22T23:17:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"JC Landry\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:site\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"JC Landry\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0729-obd2-gear-6-incorrect-ratio#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0729-obd2-gear-6-incorrect-ratio\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P0729 OBD2: Gear 6 Incorrect Ratio\",\"datePublished\":\"2025-08-22T23:17:14+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0729-obd2-gear-6-incorrect-ratio\"},\"wordCount\":406,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0729-obd2-gear-6-incorrect-ratio#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/p0729-obd2-gear-6-incorrect-ratio.png\",\"articleSection\":[\"P Codes - 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He also loves cats, Johnny Cash and Subarus.","sameAs":["https:\/\/www.facebook.com\/jee514","https:\/\/www.instagram.com\/rat_in_chief\/","https:\/\/www.linkedin.com\/in\/jean-claude-landry-857781186\/"],"url":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"}]}},"uagb_featured_image_src":{"full":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0729-obd2-gear-6-incorrect-ratio-1050x525.png",1050,525,true]},"uagb_author_info":{"display_name":"JC Landry","author_link":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"},"uagb_comment_info":0,"uagb_excerpt":"The P0729 code is an OBD-II trouble code that indicates a Gear 6 Incorrect Ratio. This code is triggered when the Transmission Control Module (TCM) detects that the transmission is not engaging the correct gear as expected. What Does the P0729 Code Mean? OBD-II Code P0729 is defined as a Gear 6 Incorrect Ratio. 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