{"id":76115,"date":"2022-10-16T18:37:22","date_gmt":"2022-10-17T01:37:22","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=76115"},"modified":"2023-09-04T22:29:51","modified_gmt":"2023-09-05T05:29:51","slug":"u0020-code-low-speed-can-communication-bus-performance","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/u0020-code-low-speed-can-communication-bus-performance\/","title":{"rendered":"U0020 Code: Low Speed CAN Communication Bus 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_c65d25-35 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_c65d25-35 > .kt-inside-inner-col,.kadence-column_c65d25-35 > .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_c65d25-35 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_c65d25-35 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_c65d25-35 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_c65d25-35 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_c65d25-35{position:relative;}@media all and (max-width: 1024px){.kadence-column_c65d25-35 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_c65d25-35 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_c65d25-35 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-e5807d  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-cf5567\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_19c4e1-ee, .wp-block-kadence-advancedheading.kt-adv-heading_19c4e1-ee[data-kb-block=\"kb-adv-heading_19c4e1-ee\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_19c4e1-ee mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_19c4e1-ee[data-kb-block=\"kb-adv-heading_19c4e1-ee\"] 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_19c4e1-ee img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_19c4e1-ee[data-kb-block=\"kb-adv-heading_19c4e1-ee\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_19c4e1-ee summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_19c4e1-ee\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The U0020 code stands for &ldquo;Low Speed CAN Communication Bus Performance.&rdquo;&nbsp;<\/li><li>This code is set when the system perceives a problem with the low-speed CAN bus.<\/li><li>Some common causes include network problems, a low voltage condition, a faulty control module, and wiring issues.<\/li><li>Symptoms to look out for include an illuminated check engine light and problems with the electronics and computer controls.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The controller area network (CAN) is a data bus that lets various systems like <a href=\"https:\/\/www.carparts.com\/blog\/how-does-power-steering-work-with-example-diagrams\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"electronic steering\">electronic steering<\/a>, climate control, <a href=\"https:\/\/www.carparts.com\/blog\/what-is-abs-anti-lock-braking-system-a-complete-guide\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"anti-lock braking\">anti-lock braking<\/a>, and lighting controls, among others, communicate with one another.<\/p>\n\n\n\n<p>The CAN protocol was approved by the Environmental Protection Agency (EPA) for 2003 and newer vehicles. It was proposed as a legal requirement for all vehicles by 2008.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the U0020 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) U0020 stands for &ldquo;Low Speed CAN Communication Bus Performance.&rdquo;<\/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\/10\/driver-perforns-car-functionality-inspection-1024x682.jpg\" alt=\"driver perforns car functionality inspection\" class=\"wp-image-76132\" width=\"1024\" height=\"682\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/driver-perforns-car-functionality-inspection-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/driver-perforns-car-functionality-inspection-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/driver-perforns-car-functionality-inspection-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/driver-perforns-car-functionality-inspection-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/driver-perforns-car-functionality-inspection-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/driver-perforns-car-functionality-inspection-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/driver-perforns-car-functionality-inspection-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/driver-perforns-car-functionality-inspection.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Trouble code U0020 is a generic powertrain code that can be logged in vehicles with an OBD-II system.<\/figcaption><\/figure>\n\n\n\n<p>The CAN bus is a central network that lets all modules see the messages being sent by different modules. While this might be the case, the messages being transmitted have their respective identifiers that only let the affected module act on the data received.<\/p>\n\n\n\n<p>There are three CAN classifications according to speed rating with Class A as the lowest and Class C as the highest classification.<\/p>\n\n\n\n<p>The CAN bus is subject to an electrical fault, which can affect the performance of other systems. If a problem with the low-speed CAN bus occurs, on-board diagnostics (OBD-II) will log a U0020 trouble code.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code U0020 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 U0020 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Network problems<\/li><li>Low voltage condition<\/li><li>Faulty control module<\/li><li>Wiring issues, such as a damaged wire or poor connection<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the U0020 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/carparts.com\/blog\/check-engine-light-flashing\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"Illuminated check engine light\">Illuminated check engine light<\/a><\/li><li>Various problems with the electronics and computer controls<\/li><\/ul>\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<h2 class=\"wp-block-heading\">How to Diagnose the U0020 Code<\/h2>\n\n\n\n<p>Trouble code U0020 is a generic powertrain code that can be logged in vehicles with an OBD-II system. However, steps for diagnosis can vary, depending on vehicle specifications. Diagnosing a trouble code might require you to use a scan tool and inspect the vehicle for damaged or corroded wiring, among others.<\/p>\n\n\n\n<p>If you&rsquo;re not used to doing this task on your own, you can always seek the help of a certified mechanic to do the job for you. Otherwise, you can go ahead and diagnose the problem on your own.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the U0020 Code<\/h2>\n\n\n\n<p>Without the right tools and technical knowledge, attempting to fix a U0020 code can be tricky and might even lead to further complications if done incorrectly. Under these circumstances, it&rsquo;s best to bring your vehicle to the nearest repair shop and have a trained professional perform the necessary repairs.<\/p>\n\n\n\n<p>But if you think you have enough DIY skills to do the job yourself, make sure to have the right equipment and information before proceeding. Trouble codes don&rsquo;t have a universal solution that will work for all makes and models, which is why it&rsquo;s important to consult the right manuals. Guides like those from Chilton or an ALLDATA subscription contain vehicle-specific repair information, so you might want to check those out before you proceed.<\/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>The controller area network (CAN) is a data bus that lets various systems like electronic steering, climate control, anti-lock braking,&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/u0020-code-low-speed-can-communication-bus-performance\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":76133,"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":[],"ppma_author":[2607,2855],"class_list":{"0":"post-76115","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>U0020 Code: Low Speed CAN Communication Bus Performance - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what a U0020 code means and the most common causes that could trigger it.\" \/>\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\/u0020-code-low-speed-can-communication-bus-performance\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0020 Code: Low Speed CAN Communication Bus Performance - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what a U0020 code means and the most common causes that could trigger it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/u0020-code-low-speed-can-communication-bus-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=\"2022-10-17T01:37:22+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-05T05:29:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/two-mechanics-encounter-u0020-code-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1362\" \/>\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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/u0020-code-low-speed-can-communication-bus-performance\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/u0020-code-low-speed-can-communication-bus-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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