{"id":16278,"date":"2021-05-04T01:10:00","date_gmt":"2021-05-04T08:10:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16278"},"modified":"2025-05-08T00:46:25","modified_gmt":"2025-05-08T07:46:25","slug":"u0073-code-control-module-communication-bus-a-off","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/u0073-code-control-module-communication-bus-a-off\/","title":{"rendered":"U0073 Code: Control Module Communication Bus \u201cA\u201d Off"},"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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column16278_bbc496-30 > .kt-inside-inner-col,.kadence-column16278_bbc496-30 > .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-column16278_bbc496-30 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16278_bbc496-30 > .kt-inside-inner-col{flex-direction:column;}.kadence-column16278_bbc496-30 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16278_bbc496-30 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16278_bbc496-30{position:relative;}@media all and (max-width: 1024px){.kadence-column16278_bbc496-30 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16278_bbc496-30 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16278_bbc496-30 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-ce987b  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-4e4dd7\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading16278_c557c1-d2, .wp-block-kadence-advancedheading.kt-adv-heading16278_c557c1-d2[data-kb-block=\"kb-adv-heading16278_c557c1-d2\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading16278_c557c1-d2 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading16278_c557c1-d2[data-kb-block=\"kb-adv-heading16278_c557c1-d2\"] 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-heading16278_c557c1-d2 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading16278_c557c1-d2[data-kb-block=\"kb-adv-heading16278_c557c1-d2\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading16278_c557c1-d2 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading16278_c557c1-d2\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The U0073 means your control modules aren&rsquo;t communicating properly.<\/li>\n\n\n\n<li>Some of the common symptoms of the code include an illuminated check engine light, engine power loss, and reduced fuel economy.<\/li>\n\n\n\n<li>It&rsquo;s best to leave the code to professionals since it&rsquo;s a tricky code to clear.<\/li>\n\n\n\n<li>Fixing a U0073 code typically involves checking the battery level, inspecting the CANbus for visible damage, and searching for any related Technical Service Bulletins (TSBs).<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">What Does the U0073 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) U0073 stands for &ldquo;Control Module Communication Bus &ldquo;A&rdquo; Off.&rdquo; OBD code U0073 &nbsp;is a communication system DTC that applies to most vehicles. Usually, this code is triggered when communication is lost intermittently or fully between your vehicle&rsquo;s control modules.<\/p>\n\n\n\n<p>U0073 is a <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"communication system diagnostic code\">communication system diagnostic code<\/a> related to your CANbus. This code can register in a variety of modules, including the PCM, TCM, <a href=\"https:\/\/www.carparts.com\/blog\/what-are-the-symptoms-of-a-bad-abs-module-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"anti-lock braking system\">anti-lock braking system<\/a> (ABS), or <a href=\"https:\/\/www.carparts.com\/body-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"body control module\">body control module<\/a> (BCM).<\/p>\n\n\n\n    <div class=\"ai-summary-widget\">\n\n        <div class=\"ai-summary-grid\">\n\n            <div>\n                <div class=\"ai-avatar\">\n                    <figure>\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/ai-summary\/ai-bot\" alt=\"AI robot\">\n                    <\/figure>\n                    <span>ELI5<\/span>\n                <\/div>\n            <\/div>\n            <div>\n                <p>The control module communication bus \"A\" is a network of wires that lets your car's computers talk to each other. The computers control the engine, transmission, and other systems in your car. They need to send signals and data to each other. The control module communication bus \"A\" carries that important information between the computer. It's a controller area network (CAN) bus, a type of data network.<\/p>    \n            <\/div>\n\n        <\/div>\n\n        <div class=\"ai-summary-tooltip\">   \n            <p>Not everyone is an auto repair expert. <strong>ELI5 (&ldquo;Explain Like I&rsquo;m Five&rdquo;)<\/strong> provides layperson-friendly explanations of complex automotive concepts, systems, &amp; parts, so you can fully understand their importance. Great for casual car owners and DIY beginners! Powered by AI.<\/p>\n        <\/div>\n\n    <\/div>\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\/2020\/09\/body-control-module-1024x683.jpeg\" alt=\"body control module\" class=\"wp-image-16304\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/body-control-module-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/body-control-module-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/body-control-module-768x513.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/body-control-module-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/body-control-module-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/body-control-module.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The U0073 code can register in a variety of modules, including the PCM, TCM, anti-lock braking system (ABS), or body control module (BCM).<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">An In-Depth Look at Code U0073&nbsp;<\/h3>\n\n\n\n<p>Your vehicle&rsquo;s data network is much like a human body&rsquo;s nervous system, as it connects various modules. For example, a 2019 <a href=\"https:\/\/www.carparts.com\/ford\/f-150\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"F150\">F150<\/a> (depending on its equipment package) may have 40 modules, all of which communicate with each other. Many vehicles have far more modules than 40, and there are switches embedded in modules that send the switch signals over the network on some of them.&nbsp;<\/p>\n\n\n<style>.kadence-column16278_36f99b-3a > .kt-inside-inner-col,.kadence-column16278_36f99b-3a > .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-column16278_36f99b-3a > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16278_36f99b-3a > .kt-inside-inner-col{flex-direction:column;}.kadence-column16278_36f99b-3a > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16278_36f99b-3a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16278_36f99b-3a{position:relative;}@media all and (max-width: 1024px){.kadence-column16278_36f99b-3a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16278_36f99b-3a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16278_36f99b-3a kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id16278_16c2b2-f3 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id16278_16c2b2-f3 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id16278_16c2b2-f3 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id16278_16c2b2-f3 > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id16278_16c2b2-f3 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id16278_16c2b2-f3 > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id16278_16c2b2-f3 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id16278_16c2b2-f3 alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column16278_a1dc96-67 > .kt-inside-inner-col{display:flex;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col{min-height:45px;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col,.kadence-column16278_a1dc96-67 > .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-column16278_a1dc96-67 > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col > *, .kadence-column16278_a1dc96-67 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16278_a1dc96-67 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16278_a1dc96-67{position:relative;}@media all and (max-width: 1024px){.kadence-column16278_a1dc96-67 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column16278_a1dc96-67 > .kt-inside-inner-col > *, .kadence-column16278_a1dc96-67 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16278_a1dc96-67 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column16278_a1dc96-67 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col > *, .kadence-column16278_a1dc96-67 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16278_a1dc96-67 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16278_a1dc96-67 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16278_a1dc96-67 kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image16278_dc672c-3e.kb-image-is-ratio-size, .kb-image16278_dc672c-3e .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image16278_dc672c-3e.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image16278_dc672c-3e .kb-image-is-ratio-size{align-self:unset;}.kb-image16278_dc672c-3e figure{max-width:45px;}.kb-image16278_dc672c-3e .image-is-svg, .kb-image16278_dc672c-3e .image-is-svg img{width:100%;}.kb-image16278_dc672c-3e .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image16278_dc672c-3e\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column16278_359d0f-d5 > .kt-inside-inner-col,.kadence-column16278_359d0f-d5 > .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-column16278_359d0f-d5 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16278_359d0f-d5 > .kt-inside-inner-col{flex-direction:column;}.kadence-column16278_359d0f-d5 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16278_359d0f-d5 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16278_359d0f-d5{position:relative;}@media all and (max-width: 1024px){.kadence-column16278_359d0f-d5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16278_359d0f-d5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16278_359d0f-d5 inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\nThere are high and low-speed networks, one-wire and two-wire networks, and modules on the vehicle network that act as translators. They receive input from the various networks and send them out to the modules that need the information.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p0141-code-oxygen-sensor-heater-circuit-malfunction-bank-1-sensor-2\/\" target=\"_self\" rel=\"dofollow\" class=\"u6391a6a23f634c5b8ad45af3baff617a\"><style> .u6391a6a23f634c5b8ad45af3baff617a { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .u6391a6a23f634c5b8ad45af3baff617a:active, .u6391a6a23f634c5b8ad45af3baff617a:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u6391a6a23f634c5b8ad45af3baff617a { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u6391a6a23f634c5b8ad45af3baff617a .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u6391a6a23f634c5b8ad45af3baff617a .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u6391a6a23f634c5b8ad45af3baff617a:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P0141 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>The U0073 code doesn&rsquo;t apply to all newer vehicles. It mostly applies to vehicles equipped with the faster network referred to as the CAN bus, of which there are different speeds. CAN bus speeds are determined by the importance of the information the CAN bus is expected to deliver.&nbsp;<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>The U0073 code doesn&rsquo;t apply to all newer vehicles. It mostly applies to vehicles equipped with the faster network referred to as the CAN bus, of which there are different speeds. CAN bus speeds are determined by the importance of the information the CAN bus is expected to deliver.<\/p>\n<cite>&ndash;<a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p>The fastest CAN busses do the most time-sensitive work on vehicles, particularly powertrain (engine\/transmission) control, vehicle dynamics, etc. More recently, engine control modules (ECM) and <a href=\"https:\/\/www.carparts.com\/transmission-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission control modules\">transmission control modules<\/a> (TCM) are separate modules rather than being concentrated in just one powertrain control module (PCM). Thus, some of the more important information exchanged between modules are the messages between the ECM and TCM during normal driving.<\/p>\n\n\n\n<p>With that in mind, just about any issue a vehicle may have can be network-related, thus the bevy of Uxxx codes that can be set in modern vehicle systems.<\/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>Unexpected issues can cause network codes. For instance, a <a href=\"https:\/\/www.carparts.com\/vehicle\/2007\/cadillac\/escalade\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"2007 Cadillac Escalade\">2007 Cadillac Escalade<\/a> can have a <a href=\"https:\/\/www.carparts.com\/blog\/why-is-my-traction-control-light-on-causes-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"flashing traction control light\">flashing traction control light<\/a> and a stored network code due to extremely high fuel pressure from an in-tank pump with a bad fuel pressure regulator. With that in mind, note that Uxxx codes aren&rsquo;t typically DIY serviceable beyond checking fuses, examining module connections, or looking for chafed or damaged wire harnesses. Moisture intrusion on vehicles with body water leaks can be an issue as well, and just about any module that has to be replaced must have some programming done.<\/p>\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\/2021\/05\/car-engine-control-unite-ECU-and-electric-fuse-box-1024x683.jpg\" alt=\"car engine control unite ECU and electric fuse box\" class=\"wp-image-38659\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/05\/car-engine-control-unite-ECU-and-electric-fuse-box-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/05\/car-engine-control-unite-ECU-and-electric-fuse-box-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/05\/car-engine-control-unite-ECU-and-electric-fuse-box-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/05\/car-engine-control-unite-ECU-and-electric-fuse-box-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/05\/car-engine-control-unite-ECU-and-electric-fuse-box-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/05\/car-engine-control-unite-ECU-and-electric-fuse-box-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/05\/car-engine-control-unite-ECU-and-electric-fuse-box-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">More recently, engine control modules (ECM) and transmission control modules (TCM) are separate modules rather than being concentrated in just one powertrain control module (PCM).<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the U0073 Code?&nbsp;<\/h2>\n\n\n\n<p>Here are some of the possible causes that could trigger the U0073 code:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An issue with one of the control modules<\/li>\n\n\n\n<li>A data network problem<\/li>\n\n\n\n<li>A circuit problem, such as damaged wiring or a poor connection&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the U0073 Code?&nbsp;<\/h2>\n\n\n\n<p>Common symptoms associated with the code include the following:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Illuminated check engine light\">Illuminated check engine light<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/what-triggers-reduced-engine-power\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Loss of engine power\">Loss of engine power<\/a><\/li>\n\n\n\n<li>Reduced fuel economy<\/li>\n\n\n\n<li>A possible no-crank or no-starting condition<\/li>\n\n\n\n<li>A driver information message (DIC) message is displayed<\/li>\n\n\n\n<li>Transmission won&rsquo;t shift<\/li>\n\n\n\n<li>Various other symptoms too numerous to list&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the U0073 Code<\/h2>\n\n\n\n<p>Resolving code U0073 can be challenging. It is usually best to leave the job to trusted professionals with the tools to isolate the concern and repair it.&nbsp;<\/p>\n\n\n\n<p>However, if you&rsquo;re confident about your DIY repair skills, here is a video you can watch to help you learn more about code U0073 diagnosis:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Chevy Silverado No Communication\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/2-qnsfC5o7Q?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the U0073 Code&nbsp;<\/h2>\n\n\n\n<p>Fixing the U0073 code can be tricky, especially since solutions can vary depending on your vehicle&rsquo;s make and model. With that being said, a few things you can attempt include:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Battery Check<\/h3>\n\n\n\n<p>Do a quick <a href=\"https:\/\/www.carparts.com\/blog\/how-to-check-car-battery\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check on your vehicle&rsquo;s battery\">check on your vehicle&rsquo;s battery<\/a> to see if it&rsquo;s still running strong. Low power can lead to the U0073 code being flashed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Other DTC Logs<\/h3>\n\n\n\n<p>Using a code reader, you can check for other DTC logs that might be linked to the U0073 code. Addressing the other logs might also solve U0073.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Visual Inspection<\/h3>\n\n\n\n<p>Do a quick visual inspection of the CANbus area. Any broken wires or loose connectors can trigger the U0073 code. Replacing or repairing these parts might be the simple solution you need to fixing U0073.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Technical Service Bulletins (TSBs)<\/h3>\n\n\n\n<p>Keep an eye out for any <a href=\"https:\/\/www.carparts.com\/blog\/how-tsbs-make-diagnosing-and-repairing-cars-easier\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"TSBs from your vehicle&rsquo;s manufacturer\">TSBs from your vehicle&rsquo;s manufacturer<\/a> about your vehicle&rsquo;s model and year. These bulletins will often let you know if there&rsquo;s a specific problem linked to your vehicle&rsquo;s model that needs addressing and how to get it fixed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Seek Professional Assistance<\/h3>\n\n\n\n<p>The CANbus module is an especially complex system that you need to be familiar with before making any type of repair. We recommend contacting a licensed mechanic for their assistance rather than attempting further repairs by yourself. Here are the steps a professional might need to do:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check the battery level and all the connections to the CANbus unit to ensure everything is clean and tight.<\/li>\n\n\n\n<li>Using a scanner, a professional can read any diagnostic trouble codes that the system memory has stored. This allows them to compare the codes to the manufacturer&rsquo;s diagnostics codes and identify the problem faster.<\/li>\n\n\n\n<li>Using a different scanning tool to confirm the continuity in all CANbus &lsquo;A&rsquo; modules.<\/li>\n\n\n\n<li>Test-drive the vehicle and test that each module is communicating with the diagnostic computer.<\/li>\n\n\n\n<li>Troubleshoot the different components to test if any parts are prone to failure.<\/li>\n\n\n\n<li>Once they identify the issues, they can replace the problematic components, including the ECM, with parts using identical configurations and <a href=\"https:\/\/www.carparts.com\/blog\/where-is-the-vin-number-on-a-car\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vehicle identification numbers\">vehicle identification numbers<\/a> (VIN).<\/li>\n\n\n\n<li>Test-drive the vehicle a final time after replacing the components.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Is the Engine Code U0077?<\/h2>\n\n\n\n<p>Similar to the U0073 code, U0077 codes are stored in the error memory of the control unit. The U0077-00 is defined as the Control Module Communication Chassis Expansion CAN Bus Off Code, which is related to communication problems of the data bus systems.<\/p>\n\n\n\n<p>It&rsquo;s typically addressed by checking the vehicle&rsquo;s battery, electrical system voltage, and various system components.<\/p>\n\n\n\n<p>Depending on your vehicle&rsquo;s year, make, and model, you might have to check with your manufacturer regarding any TSBs. For example, GM issued a TSB for several Chevrolet Silverado and GMC Sierra models regarding the U0077 error code. A high resistance\/open in the Communication Enable circuit 5986 can trigger various DTCs, including the U0077. Owners of said vehicles were advised to repair any opens in the circuit and review their warranty information.<\/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\/body-control-module\" target=\"_blank\" aria-label=\"body 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\/ac10427828_1\">\n<strong>Body Control Module<\/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\/a1785371_1\">\n<strong>Engine Control Module<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/transmission-control-module\" target=\"_blank\" aria-label=\"transmission 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\/ac25185602_1\">\n<strong>Transmission Control Module<\/strong>\n<\/a>\n\n<!-- end of editable content -->\n\n<\/div>\n\n\n\n<p><\/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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>What Does the U0073 Code Mean? Diagnostic trouble code (DTC) U0073 stands for &ldquo;Control Module Communication Bus &ldquo;A&rdquo; Off.&rdquo; OBD&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/u0073-code-control-module-communication-bus-a-off\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":16306,"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":[1882,504,1222],"ppma_author":[2607,2985],"class_list":{"0":"post-16278","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-body-control-module","9":"tag-engine-control-module","10":"tag-transmission-control-module","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>U0073 Code: Control Module Communication Bus \u201cA\u201d Off - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what OBD-II code U0073 is, its possible causes, and the common symptoms related to it with the help of 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\/u0073-code-control-module-communication-bus-a-off\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0073 Code: Control Module Communication Bus \u201cA\u201d Off - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what OBD-II code U0073 is, its possible causes, and the common symptoms related to it with the help of this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/u0073-code-control-module-communication-bus-a-off\/\" \/>\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:author\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2021-05-04T08:10:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-08T07:46:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/anti-lock-braking-system-module.jpeg\" \/>\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=\"author\" content=\"CarParts.com Research Team, Richard McCuistian, ASE Certified Master Automobile Technician\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/CarPartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"CarParts.com Research Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/u0073-code-control-module-communication-bus-a-off\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/u0073-code-control-module-communication-bus-a-off\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1651\",\"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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