{"id":74644,"date":"2022-10-06T00:50:16","date_gmt":"2022-10-06T07:50:16","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=74644"},"modified":"2023-10-02T17:36:24","modified_gmt":"2023-10-03T00:36:24","slug":"p0864-code-tcm-communication-circuit-range-performance","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0864-code-tcm-communication-circuit-range-performance\/","title":{"rendered":"P0864 Code: TCM Communication Circuit Range\/Performance"},"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_56f422-3f > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_56f422-3f > .kt-inside-inner-col,.kadence-column_56f422-3f > .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_56f422-3f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_56f422-3f > .kt-inside-inner-col{flex-direction:column;}.kadence-column_56f422-3f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_56f422-3f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_56f422-3f{position:relative;}@media all and (max-width: 1024px){.kadence-column_56f422-3f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_56f422-3f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_56f422-3f qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-7e6b5a  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-c3a0b2\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_c44783-22, .wp-block-kadence-advancedheading.kt-adv-heading_c44783-22[data-kb-block=\"kb-adv-heading_c44783-22\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_c44783-22 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_c44783-22[data-kb-block=\"kb-adv-heading_c44783-22\"] 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_c44783-22 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_c44783-22[data-kb-block=\"kb-adv-heading_c44783-22\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_c44783-22 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_c44783-22\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The diagnostic trouble code (DTC) P0864 indicates &ldquo;TCM Communication Circuit Range\/Performance.&rdquo;<\/li><li>The powertrain control module (PCM) will log the P0864 code if the transmission control module (TCM) can&rsquo;t contact the engine control module (ECM) and vice versa.<\/li><li>Common causes of the P0864 code are a failed TCM, faulty wiring, and ECM failure.&nbsp;<\/li><li>The P0864 code can show symptoms like erratic shifting, the transmission refusing to shift, and delayed shifting between gears.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Vehicles have computers that run specific vehicle systems by changing certain variables in their operation. Two of these computers are the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine control module (ECM)\">engine control module (ECM)<\/a> and <a href=\"https:\/\/www.carparts.com\/transmission-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission control module (TCM)\">transmission control module (TCM)<\/a>.&nbsp; The P0864 code, or other related trouble codes, can be stored if there are communications problems between these two components.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0864 Code Mean?<\/h2>\n\n\n\n<p>The P0864 code is defined as &ldquo;TCM Communication Circuit Range\/Performance.&rdquo; This code is triggered when the TCM can&rsquo;t communicate with the ECM or vice versa. When this code is stored, there&rsquo;s a good chance that there are other stored <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"diagnostic trouble codes (DTCs)\">diagnostic trouble codes (DTCs)<\/a> related to the ECM or TCM.<\/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\/2022\/09\/automotive-transmission-control-module-1024x614.jpg\" alt=\"automotive transmission control module image\" class=\"wp-image-74726\" width=\"1024\" height=\"614\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/automotive-transmission-control-module-1024x614.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/automotive-transmission-control-module-300x180.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/automotive-transmission-control-module-768x461.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/automotive-transmission-control-module-150x90.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/automotive-transmission-control-module.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The P0864 code is triggered when the TCM can&rsquo;t communicate with the ECM or vice versa.<\/figcaption><\/figure>\n\n\n\n<p>This code can also have various transmission-related symptoms because the ECM needs information from the TCM in order to command the right shift timings. Without these two computers working together to help your vehicle run more efficiently, you can expect your vehicle to consume more fuel.<\/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><em><strong>Note:<\/strong> The definition of the P0864 code can 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 P0864 Code?<\/h2>\n\n\n\n<p>The issues that trigger the P0864 code are commonly caused by the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Failed TCM<\/li><li>Faulty <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wiring\">wiring<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/bad-engine-control-module-ecm-symptoms-repair-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty ECM\">Faulty ECM<\/a><\/li><li>PCM or TCM programming errors<\/li><li>Data network problems<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0864 Code?<\/h2>\n\n\n\n<p>Common symptoms of the P0864 code include the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Erratic shifting<\/li><li>The transmission refuses to shift<\/li><li>The transmission shifts are delayed<\/li><li>Vehicle stuck in <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><\/li><li>Decreased fuel economy<\/li><li>Other transmission-related DTCs<\/li><\/ul>\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\/2022\/09\/engine-control-module-of-a-car-1024x614.jpg\" alt=\"engine control module of a car\" class=\"wp-image-74727\" width=\"1024\" height=\"614\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/engine-control-module-of-a-car-1024x614.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/engine-control-module-of-a-car-300x180.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/engine-control-module-of-a-car-768x461.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/engine-control-module-of-a-car-150x90.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/engine-control-module-of-a-car.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Your car might have a faulty ECM if it&rsquo;s logging the code P0864.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0864 Code<\/h2>\n\n\n\n<p>The P0864 can trigger in most modern vehicles. Diagnosing trouble codes related to electrical components might require you to unplug connectors and use a digital multimeter to check for abnormal readings from various sensors. However, keep in mind that the steps for diagnosis and repair can vary, depending on vehicle specifications. This can be incredibly difficult without the right equipment and knowledge. If you aren&rsquo;t familiar with the process, it&rsquo;s best to let a mechanic do the job for you to ensure that all steps and protocols are followed correctly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0864 Code<\/h2>\n\n\n\n<p>Without the right tools and technical knowledge, fixing the P0864 code can be frustrating and confusing. It can even lead to further complications down the road if you don&rsquo;t follow the appropriate repair process. If you aren&rsquo;t confident in your DIY skills, you can always bring your vehicle to the nearest repair shop and have a professional mechanic do the job for you.<\/p>\n\n\n\n<p>But if you think you have what it takes to fix the problem on your own, make sure to have the <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"right repair information\">right repair information<\/a> before proceeding. There&rsquo;s no such thing as a magic bullet that can resolve all trouble codes for every make and model, which is why having vehicle-specific repair information is a must. You can check out Chilton repair manuals or get an ALLDATA subscription to get the right guides for your vehicle.<\/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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Vehicles have computers that run specific vehicle systems by changing certain variables in their operation. Two of these computers are&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0864-code-tcm-communication-circuit-range-performance\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":74739,"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":[1222],"ppma_author":[2607,2855],"class_list":{"0":"post-74644","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-transmission-control-module","9":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0864 Code: TCM Communication Circuit Range\/Performance - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn more about the definition and common causes and symptoms of the diagnostic trouble code P0864 in this article.\" \/>\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\/p0864-code-tcm-communication-circuit-range-performance\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0864 Code: TCM Communication Circuit Range\/Performance - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn more about the definition and common causes and symptoms of the diagnostic trouble code P0864 in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0864-code-tcm-communication-circuit-range-performance\/\" \/>\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=\"2022-10-06T07:50:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-03T00:36:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/09\/obd-scanner-tool.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\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\\\/p0864-code-tcm-communication-circuit-range-performance\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0864-code-tcm-communication-circuit-range-performance\\\/\"},\"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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