{"id":78365,"date":"2025-08-15T14:32:13","date_gmt":"2025-08-15T19:32:13","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78365"},"modified":"2025-08-15T14:32:13","modified_gmt":"2025-08-15T19:32:13","slug":"p085c-obd2-gear-shift-control-module-b-communication-circuit-high","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p085c-obd2-gear-shift-control-module-b-communication-circuit-high","title":{"rendered":"P085C OBD2: Gear Shift Control Module &#8220;B&#8221; Communication Circuit High"},"content":{"rendered":"<p>The P085C OBD-II code is a diagnostic trouble code that indicates a problem with the communication between the Transmission Control Module (TCM) and the engine computer (PCM). This code is often triggered when the TCM fails to properly communicate with the PCM, which is essential for optimal vehicle performance.<\/p>\n<h2>What Does the P085C Code Mean?<\/h2>\n<p>When the P085C code is set, it signifies that there is a high voltage present in the Gear Shift Control Module &#8220;B&#8221; communication circuit. This communication is vital for the transmission to shift properly and for the overall functionality of the vehicle.<\/p>\n<h2>What Causes the P085C Code?<\/h2>\n<p>The P085C code can be caused by several factors, including:<\/p>\n<ul>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Transmission Control Module (TCM) failure<\/li>\n<li>Wiring issues leading to poor communication<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P085C Code?<\/h2>\n<p>Drivers may experience a range of symptoms when the P085C code is present, including:<\/p>\n<ul>\n<li>Transmission may not shift properly<\/li>\n<li>Engine may not start<\/li>\n<\/ul>\n<h2>How Serious Is the P085C Code?<\/h2>\n<p>The severity of the P085C code is classified as urgent. It indicates a malfunction that can lead to significant damage not only to the transmission but also to the overall vehicle if not addressed promptly. Additionally, it poses potential safety risks for the driver and passengers.<\/p>\n<h2>How to Diagnose the P085C Code<\/h2>\n<p>Diagnosing the P085C code typically involves the following steps:<\/p>\n<ol>\n<li>Utilizing an OBD-II scanner to confirm the presence of the P085C code.<\/li>\n<li>Inspecting the wiring and connectors related to the TCM and PCM for any signs of damage or corrosion.<\/li>\n<li>Testing the TCM and PCM for proper functionality.<\/li>\n<li>Checking for additional trouble codes that may indicate other underlying issues.<\/li>\n<\/ol>\n<h2>Common Repairs for the P085C Code<\/h2>\n<p>Repairs for the P085C code may include:<\/p>\n<ul>\n<li>Replacing the Transmission Control Module (TCM)<\/li>\n<li>Replacing the Powertrain Control Module (PCM)<\/li>\n<li>Repairing or replacing damaged wiring or connectors<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P085C Code?<\/h2>\n<p>The cost to repair the P085C code can vary widely depending on the cause and the make and model of the vehicle. On average, repairs can range from $100 to $1,500. A simple wiring fix may be inexpensive, while a TCM or PCM replacement could be more costly.<\/p>\n<h2>Can I Fix the P085C Code Myself?<\/h2>\n<p>While some aspects of diagnosing and fixing the P085C code may be attempted by a knowledgeable DIYer, it is recommended to seek professional assistance. A proper diagnosis requires specialized tools and expertise, and incorrect repairs can lead to further issues.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P085C OBD-II code is a diagnostic trouble code that indicates a problem with the communication between the Transmission Control Module (TCM) and the engine computer (PCM). This code is often triggered when the TCM fails to properly communicate with the PCM, which is essential for optimal vehicle performance. What Does the P085C Code Mean? &hellip;<\/p>\n","protected":false},"author":26,"featured_media":92803,"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-78365","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 P085C \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P085C code, what causes gear shift control module communication issues, and how to diagnose and fix common problems to maintain optimal vehicle 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\/p085c-obd2-gear-shift-control-module-b-communication-circuit-high\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P085C OBD2: Gear Shift Control Module &quot;B&quot; Communication Circuit High\" \/>\n<meta property=\"og:description\" content=\"The P085C OBD-II code is a diagnostic trouble code that indicates a problem with the communication between the Transmission Control Module (TCM) and the\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p085c-obd2-gear-shift-control-module-b-communication-circuit-high\" \/>\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=\"2025-08-15T19:32:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p085c-obd2-gear-shift-control-module-b-communication-circuit-high.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\\\/p085c-obd2-gear-shift-control-module-b-communication-circuit-high#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p085c-obd2-gear-shift-control-module-b-communication-circuit-high\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P085C OBD2: Gear Shift Control Module &#8220;B&#8221; 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