{"id":66479,"date":"2022-02-03T23:29:16","date_gmt":"2022-02-04T07:29:16","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=66479"},"modified":"2025-03-24T19:42:22","modified_gmt":"2025-03-25T02:42:22","slug":"u0001-code-high-speed-can-communication-bus","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/u0001-code-high-speed-can-communication-bus\/","title":{"rendered":"U0001 Code: High Speed CAN Communication Bus"},"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-column66479_80ed6f-ec > .kt-inside-inner-col,.kadence-column66479_80ed6f-ec > .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-column66479_80ed6f-ec > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column66479_80ed6f-ec > .kt-inside-inner-col{flex-direction:column;}.kadence-column66479_80ed6f-ec > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column66479_80ed6f-ec > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column66479_80ed6f-ec{position:relative;}@media all and (max-width: 1024px){.kadence-column66479_80ed6f-ec > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column66479_80ed6f-ec > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column66479_80ed6f-ec inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-63e0c7  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-4a6893\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading66479_9566f4-8f, .wp-block-kadence-advancedheading.kt-adv-heading66479_9566f4-8f[data-kb-block=\"kb-adv-heading66479_9566f4-8f\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading66479_9566f4-8f mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading66479_9566f4-8f[data-kb-block=\"kb-adv-heading66479_9566f4-8f\"] 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-heading66479_9566f4-8f img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading66479_9566f4-8f[data-kb-block=\"kb-adv-heading66479_9566f4-8f\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading66479_9566f4-8f summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading66479_9566f4-8f\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The U0001 code stands for &ldquo;High-Speed CAN Communication Bus.&rdquo; It means the PCM detects an error within the high-speed CAN communication bus circuit or modules.<\/li>\n\n\n\n<li>CAN bus circuit issues, defective battery or corroded terminals, or a malfunctioning control module may trigger the code.<\/li>\n\n\n\n<li>Stalling and difficulty starting are some of the most common symptoms associated with the U0001 code.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Modern vehicles are equipped with various types of sensors and computers. To keep your ride running smoothly, there must be uninterrupted communication between these components. That&rsquo;s the reason why control area network (CAN) systems were developed.<\/p>\n\n\n\n<p>The high-speed CAN bus is a data network that links your ride&rsquo;s control modules that communicate at a relatively fast rate. When your vehicle&rsquo;s powertrain control module (PCM) detects that there&rsquo;s something wrong with a CAN bus circuit or control module, it will trigger the U0001 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the U0001 Code Mean?<\/h2>\n\n\n\n<p><strong>Diagnostic trouble code (DTC) U0001 stands for &ldquo;High Speed CAN communication bus.&rdquo;<\/strong> Your vehicle&rsquo;s CAN system connects various modules in your vehicle. Each module has a unique identification code for communicating on the network.<\/p>\n\n\n\n<p>The high-speed CAN operates at a certain data rate. U0001 is a communication system diagnostic code that can be logged when the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> detects an error within the high-speed CAN communication bus circuit or modules.<\/p>\n\n\n\n<p>You might notice other related CAN codes flash alongside the U0001 code depending on your vehicle. For instance, the U0002-00 &ldquo;CAN bus C off performance&rdquo; code on a Jeep will occasionally flash alongside the U0001 code on the same vehicle. The U0002 code in a Jeep indicates a possible issue with the transmission valve body or the vehicle&rsquo;s totally integrated power module (TIPM).<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code U0001 may 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<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"684\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/mechanic-using-a-multimeter-to-perform-car-tests-1024x684.jpg\" alt=\"mechanic using a multimeter to perform car tests\" class=\"wp-image-66481\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/mechanic-using-a-multimeter-to-perform-car-tests-1024x684.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/mechanic-using-a-multimeter-to-perform-car-tests-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/mechanic-using-a-multimeter-to-perform-car-tests-768x513.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/mechanic-using-a-multimeter-to-perform-car-tests-1536x1025.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/mechanic-using-a-multimeter-to-perform-car-tests-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/mechanic-using-a-multimeter-to-perform-car-tests-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/mechanic-using-a-multimeter-to-perform-car-tests-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\"> Diagnostic and repair procedures <em>for the U0001 Code<\/em> can differ per vehicle manufacturer. <\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Causes of the U0001 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CAN bus circuit issue<\/li>\n\n\n\n<li>Defective <a href=\"https:\/\/www.carparts.com\/battery\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"battery\">battery<\/a> or corroded <a href=\"https:\/\/www.carparts.com\/battery-terminal\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"terminals\">terminals<\/a><\/li>\n\n\n\n<li>Malfunctioning control module<\/li>\n<\/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\">What are the Common Symptoms of the U0001 Code?<\/h2>\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\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Difficulty starting your vehicle\">Difficulty starting your vehicle<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-shuts-off-while-driving-causes-what-to-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Stalling\">Stalling<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the U0001 Code<\/h2>\n\n\n\n<p>The tricky thing about network codes is a totally unrelated system can cause the issue, so be very careful when you&rsquo;re trying to diagnose or fix U series codes.<\/p>\n\n\n\n<p>Also, keep in mind that while code U0001 is a generic powertrain code and can present similar symptoms and triggers across various makes and models, its diagnostic and repair procedures can differ per vehicle manufacturer.<\/p>\n\n\n\n<p>If you&rsquo;re not familiar with the process of diagnosing trouble codes on your own, it might be best to leave the job to a certified mechanic. However, if you think you have the right tools and knowledge to do the job yourself, then feel free to diagnose the problem on your own.<\/p>\n\n\n\n<p>To help you out, here&rsquo;s a video that shows you what the process might involve:<\/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=\"CAN BUS testing\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/52rGiRCMJ4I?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 U0001 Code<\/h2>\n\n\n\n<p>Fixing a U0001 code isn&rsquo;t an easy task. If you&rsquo;re not an experienced automotive DIYer, it&rsquo;s a good idea to bring your vehicle to a certified mechanic to ensure that proper tests and repair procedures are carried out.<\/p>\n\n\n\n<p>But if you think you can get the job done yourself, make sure you have the right repair tools on hand.&nbsp; We recommend reading your vehicle&rsquo;s <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or checking out an online database for vehicle-specific repair information\">repair manual or checking out an online database for vehicle-specific repair information<\/a>.<\/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>Modern vehicles are equipped with various types of sensors and computers. To keep your ride running smoothly, there must be&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/u0001-code-high-speed-can-communication-bus\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":66482,"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":[73,3186],"ppma_author":[2607,2985],"class_list":{"0":"post-66479","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-battery","9":"tag-battery-terminal","10":"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>U0001 Code: High Speed CAN Communication Bus - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what the U0001 code means, its probable causes, and the common symptoms associated with 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\/u0001-code-high-speed-can-communication-bus\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0001 Code: High Speed CAN Communication Bus - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what the U0001 code means, its probable causes, and the common symptoms associated with it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/u0001-code-high-speed-can-communication-bus\/\" \/>\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=\"2022-02-04T07:29:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-25T02:42:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/02\/old-mechanic-doing-car-inspections-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1365\" \/>\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\\\/u0001-code-high-speed-can-communication-bus\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/u0001-code-high-speed-can-communication-bus\\\/\"},\"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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