{"id":77987,"date":"2025-08-25T13:34:48","date_gmt":"2025-08-25T18:34:48","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=77987"},"modified":"2025-09-02T22:12:24","modified_gmt":"2025-09-03T03:12:24","slug":"p0651-obd2-sensor-reference-voltage-b-circuit-open","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0651-obd2-sensor-reference-voltage-b-circuit-open","title":{"rendered":"P0651 OBD2: Sensor Reference Voltage &#8220;B&#8221; Circuit\/Open"},"content":{"rendered":"<p><strong>What Does the P0651 Code Mean?<\/strong><\/p>\n<p>The P0651 code indicates an issue with the sensor reference voltage &#8216;B&#8217; circuit. This code is set when the engine control module (PCM) detects a problem with the 5-volt reference signal that it sends out to the engine sensors.<\/p>\n<p><strong>What Causes the P0651 Code?<\/strong><\/p>\n<ul>\n<li>Engine sensor failure<\/li>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Wiring issues, such as shorts or breaks in the wiring<\/li>\n<\/ul>\n<p><strong>What Are the Symptoms of the P0651 Code?<\/strong><\/p>\n<ul>\n<li>The engine may not start<\/li>\n<li>Other engine performance issues may arise<\/li>\n<\/ul>\n<p><strong>How Serious Is the P0651 Code?<\/strong><\/p>\n<p>The severity of the P0651 code is considered moderate. While it may not pose an immediate threat to the safety or functionality of the vehicle, it is crucial to diagnose and address the issue within a reasonable timeframe to prevent further complications.<\/p>\n<p><strong>How to Diagnose the P0651 Code<\/strong><\/p>\n<p>Diagnosing the P0651 code typically involves the following steps:<\/p>\n<ul>\n<li>Using an OBD-II scanner to confirm the code<\/li>\n<li>Inspecting wiring and connectors for damage or corrosion<\/li>\n<li>Testing the sensor reference voltage output<\/li>\n<li>Evaluating the PCM for faults<\/li>\n<\/ul>\n<p><strong>Common Repairs for the P0651 Code<\/strong><\/p>\n<ul>\n<li>Repairing or replacing damaged wiring<\/li>\n<li>Replacing faulty engine sensors<\/li>\n<li>Reprogramming or replacing the PCM if necessary<\/li>\n<\/ul>\n<p><strong>How Much Does It Cost to Fix the P0651 Code?<\/strong><\/p>\n<p>The cost for repairs associated with the P0651 code can vary widely, depending on the specific issue. Typical repair costs can range from $100 to $1,500, largely influenced by whether wiring, sensors, or the PCM needs to be replaced.<\/p>\n<p><strong>Can I Fix the P0651 Code Myself?<\/strong><\/p>\n<p>If you have automotive repair experience, you may be able to troubleshoot and fix the P0651 code yourself. However, due to the complexity of the issue, it is often recommended to consult a certified shop for a professional diagnosis and repairs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Does the P0651 Code Mean? The P0651 code indicates an issue with the sensor reference voltage &#8216;B&#8217; circuit. This code is set when the engine control module (PCM) detects a problem with the 5-volt reference signal that it sends out to the engine sensors. What Causes the P0651 Code? Engine sensor failure Powertrain Control &hellip;<\/p>\n","protected":false},"author":26,"featured_media":93845,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[11987],"tags":[],"class_list":["post-77987","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-p-obd2-codes-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P0651 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0651 code, what causes sensor reference voltage &#039;B&#039; circuit\/open, and how to diagnose and fix common issues to maintain optimal engine performance.\" \/>\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.emanualonline.com\/blog\/p0651-obd2-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 OBD2: Sensor Reference Voltage &quot;B&quot; Circuit\/Open\" \/>\n<meta property=\"og:description\" content=\"What Does the P0651 Code Mean? The P0651 code indicates an issue with the sensor reference voltage &#039;B&#039; circuit. This code is set when the engine control\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0651-obd2-sensor-reference-voltage-b-circuit-open\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/jee514\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-25T18:34:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-03T03:12:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"JC Landry\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:site\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"JC Landry\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0651-obd2-sensor-reference-voltage-b-circuit-open#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0651-obd2-sensor-reference-voltage-b-circuit-open\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P0651 OBD2: Sensor Reference Voltage &#8220;B&#8221; 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He also loves cats, Johnny Cash and Subarus.","sameAs":["https:\/\/www.facebook.com\/jee514","https:\/\/www.instagram.com\/rat_in_chief\/","https:\/\/www.linkedin.com\/in\/jean-claude-landry-857781186\/"],"url":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"}]}},"uagb_featured_image_src":{"full":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0651-obd2-sensor-reference-voltage-b-circuitopen-1050x525.png",1050,525,true]},"uagb_author_info":{"display_name":"JC Landry","author_link":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"},"uagb_comment_info":0,"uagb_excerpt":"What Does the P0651 Code Mean? The P0651 code indicates an issue with the sensor reference voltage &#8216;B&#8217; circuit. This code is set when the engine control module (PCM) detects a problem with the 5-volt reference signal that it sends out to the engine sensors. What Causes the P0651 Code? Engine sensor failure Powertrain Control&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/77987","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/comments?post=77987"}],"version-history":[{"count":3,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/77987\/revisions"}],"predecessor-version":[{"id":95147,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/77987\/revisions\/95147"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/93845"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=77987"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=77987"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=77987"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}