{"id":67690,"date":"2022-03-22T20:01:32","date_gmt":"2022-03-23T03:01:32","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=67690"},"modified":"2023-08-17T18:05:10","modified_gmt":"2023-08-18T01:05:10","slug":"p0651-code-sensor-reference-voltage-b-circuit-open","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0651-code-sensor-reference-voltage-b-circuit-open\/","title":{"rendered":"P0651 Code: Sensor Reference Voltage \u201cB\u201d Circuit \/ Open"},"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_6b4155-61 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_6b4155-61 > .kt-inside-inner-col,.kadence-column_6b4155-61 > .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_6b4155-61 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_6b4155-61 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_6b4155-61 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_6b4155-61 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_6b4155-61{position:relative;}@media all and (max-width: 1024px){.kadence-column_6b4155-61 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_6b4155-61 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_6b4155-61 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-622bdb  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-4e7113\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_820cf2-f3, .wp-block-kadence-advancedheading.kt-adv-heading_820cf2-f3[data-kb-block=\"kb-adv-heading_820cf2-f3\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_820cf2-f3 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_820cf2-f3[data-kb-block=\"kb-adv-heading_820cf2-f3\"] 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_820cf2-f3 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_820cf2-f3[data-kb-block=\"kb-adv-heading_820cf2-f3\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_820cf2-f3 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_820cf2-f3\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P0651 code stands for &ldquo;Sensor Reference Voltage &ldquo;B&rdquo; Circuit\/Open.&rdquo;<\/li><li>It&rsquo;s triggered when the powertrain control module (PCM) detects issues with the 5-volt reference signal.<\/li><li>Blown fuses or fusible links are possible causes for the code.<\/li><li>Rough running and misfires are two symptoms to keep an eye out for.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Plugging in a scan tool into your vehicle&rsquo;s OBD-II port allows you to view codes that have been set, which can help you figure out what&rsquo;s wrong with it. If this is your first time encountering the P0651 fault code, you might wonder what it means and what are its possible causes. This guide will help you know more about this code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0651 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0651 stands for &ldquo;Sensor Reference Voltage &ldquo;B&rdquo; Circuit\/Open.&rdquo; This code sets if the powertrain control module (PCM) detects a potential issue with its 5-volt reference signal.<\/p>\n\n\n\n<p>The PCM sends out a five-volt reference signal to all applicable <a href=\"https:\/\/www.carparts.com\/blog\/car-engine-sensors\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine sensors\">engine sensors<\/a>. As the sensor resistance changes in response to varying pressure, temperature, or speed conditions, it sends the PCM an input voltage signal.<\/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\/03\/car-ecm-1024x683.jpg\" alt=\"car ecm\" class=\"wp-image-67708\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-ecm-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-ecm-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-ecm-768x513.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-ecm-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-ecm-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-ecm.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Code P0651 sets if the PCM detects a potential issue with its 5-volt reference signal.<\/figcaption><\/figure>\n\n\n\n<p>If the PCM discovers a potential problem with this reference signal or if it doesn&rsquo;t receive an input signal from one of the engine sensors, it will set the P0651 code.<\/p>\n\n\n\n<p>The P0651 fault code is typically accompanied by more specific sensor codes. However, if it&rsquo;s stored alone, there might be a problem with the PCM&rsquo;s programming.<\/p>\n\n\n\n<p>The severity of the P0651 code depends on which circuit is having the open condition. To properly determine the severity of this code, one might need to check other trouble codes stored in the vehicle&rsquo;s memory alongside this code.<\/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 code P0651 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 P0651 Code?<\/h2>\n\n\n\n<p>Trouble codes can have several possible triggers. Here are some of the most common causes of the P0651 code:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Open circuits or connectors<\/li><li>Defective or <a href=\"https:\/\/www.carparts.com\/blog\/blown-alternator-fuse-symptoms-location-and-faq\/#Other_Electrical_Oddities\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"blown fuses\">blown fuses<\/a> or fusible links<\/li><li>Defective system power relay<\/li><li>Faulty engine sensor&nbsp;<\/li><li>PCM failure<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Wiring\">Wiring<\/a> issues<\/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\/03\/automotive-fuse-1024x683.jpg\" alt=\"automotive fuse\" class=\"wp-image-67709\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/automotive-fuse-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/automotive-fuse-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/automotive-fuse-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/automotive-fuse-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/automotive-fuse-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/automotive-fuse.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Defective or blown fuses or fusible links can trigger the code P0651.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0651 Code?<\/h2>\n\n\n\n<p>When you&rsquo;re dealing with certain DTCs, you might notice several symptoms, but that&rsquo;s not always the case. Some DTCs might not show any signs at all. As for the P0651, here are some of the most common signs you might notice:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Illuminated malfunctioning indicator lamp or <a href=\"\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light\">check engine light<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Engine might not start\">Engine might not start<\/a><\/li><li>Vehicle stuck in &ldquo;limp&rdquo; mode<\/li><li>Engine performance problems, such as rough running and misfiring<\/li><li>Transmission might not shift properly<\/li><li>Other powertrain malfunctions<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0651 Code<\/h2>\n\n\n\n<p>Different trouble codes can share the same symptoms, potential causes, and areas of concern, making DTC repair complicated. Before you make any repairs or replace parts, you need to perform a thorough diagnosis first. Doing so can help you avoid damaging your vehicle even further and racking up a hefty repair bill. If you&rsquo;re not familiar with DTC troubleshooting, you will need the expertise of a professional.<\/p>\n\n\n\n<p>If you want to know more about how diagnostic and repair procedures are conducted for the P0651 fault code, there are a lot of resources available today. Of all these resources, <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vehicle-specific repair manuals\">vehicle-specific repair manuals<\/a> are your best choice. That&rsquo;s because they contain detailed repair information as well as helpful illustrations and diagrams.<\/p>\n\n\n\n<p>Here are some videos that explain P0661 diagnosis and repair in more detail:<\/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=\"2005 Cobalt Chevy p2135 p2138 p0651\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/KaolHxDMJU4?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 P0651 Code<\/h2>\n\n\n\n<p>As previously mentioned, <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"trouble codes\">trouble codes<\/a> can have multiple possible causes, each with its own set of possible solutions. These solutions can vary depending on the vehicle manufacturer. This is why there are no magic bullet solutions for DTCs. A solution to the P0651 in a Chevy truck might not be able to fix the P0651 in a VW car.<\/p>\n\n\n\n<p>Proper troubleshooting is important before you can proceed with repairs. That said, not everyone has access to the specialized tools and know-how needed to fix and diagnose the P0651. If you&rsquo;re not confident in your knowledge of DTC repairs, it&rsquo;s best to have a mechanic do the job for you so you can avoid more severe problems later on.<\/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>Plugging in a scan tool into your vehicle&rsquo;s OBD-II port allows you to view codes that have been set, which&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0651-code-sensor-reference-voltage-b-circuit-open\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":67707,"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-67690","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 v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0651 Code: Sensor Reference Voltage \u201cB\u201d Circuit \/ Open - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Having a hard time dealing with the P0651 code? This brief guide can help you figure out its meaning, common causes, and symptoms.\" \/>\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\/p0651-code-sensor-reference-voltage-b-circuit-open\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0651 Code: Sensor Reference Voltage \u201cB\u201d Circuit \/ Open - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Having a hard time dealing with the P0651 code? This brief guide can help you figure out its meaning, common causes, and symptoms.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0651-code-sensor-reference-voltage-b-circuit-open\/\" \/>\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=\"2022-03-23T03:01:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-18T01:05:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/obd-tool-scanner.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\\\/p0651-code-sensor-reference-voltage-b-circuit-open\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0651-code-sensor-reference-voltage-b-circuit-open\\\/\"},\"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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