{"id":78833,"date":"2025-07-24T15:16:46","date_gmt":"2025-07-24T20:16:46","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78833"},"modified":"2025-07-24T15:31:58","modified_gmt":"2025-07-24T20:31:58","slug":"p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low","title":{"rendered":"P0B39 OBD2: Motor Electronics Coolant Pump &#8220;B&#8221; Control Circuit Low"},"content":{"rendered":"<h2>What Does the P0B39 Code Mean?<\/h2>\n<p>The OBD-II code P0B39 indicates a problem with the Motor Electronics Coolant Pump &#8220;B&#8221; Control Circuit, specifically showing that the circuit is operating at a low level. This code is primarily associated with hybrid vehicles, which utilize a dedicated coolant pump for their hybrid system.<\/p>\n<h2>What Causes the P0B39 Code?<\/h2>\n<p>This code can be triggered by several factors, including:<\/p>\n<ul>\n<li>High voltage coolant pump failure<\/li>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Wiring issues related to the coolant pump circuit<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0B39 Code?<\/h2>\n<p>Common symptoms associated with the P0B39 code include:<\/p>\n<ul>\n<li>Engine may overheat<\/li>\n<\/ul>\n<h2>How Serious Is the P0B39 Code?<\/h2>\n<p>The P0B39 code is classified as urgent, meaning immediate action is necessary. Ignoring this issue can lead to severe damage to the vehicle&#8217;s engine or the hybrid system, potentially putting the driver and passengers at risk.<\/p>\n<h2>How to Diagnose the P0B39 Code<\/h2>\n<p>Diagnosing the P0B39 code involves a systematic approach:<\/p>\n<ul>\n<li>Use an OBD-II scanner to confirm the presence of the code.<\/li>\n<li>Inspect the wiring and connectors associated with the coolant pump for any signs of damage or corrosion.<\/li>\n<li>Test the Motor Electronics Coolant Pump to ensure it is functioning correctly.<\/li>\n<li>Check the PCM for any faults that may be causing the circuit to read low.<\/li>\n<\/ul>\n<h2>Common Repairs for the P0B39 Code<\/h2>\n<p>Repairs for the P0B39 code may include:<\/p>\n<ul>\n<li>Replacing the high voltage coolant pump if it is found to be defective.<\/li>\n<li>Repairing or replacing damaged wiring or connectors.<\/li>\n<li>Reprogramming or replacing the Powertrain Control Module (PCM) if necessary.<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0B39 Code?<\/h2>\n<p>The cost to fix the P0B39 code can vary widely based on the underlying issue. Typical repair costs may range from $100 to $1,500, depending on whether you need to replace the coolant pump, repair wiring, or replace the PCM.<\/p>\n<h2>Can I Fix the P0B39 Code Myself?<\/h2>\n<p>While some DIY enthusiasts may attempt to fix the P0B39 code, it is crucial to have a thorough understanding of automotive systems and diagnostics. If you&#8217;re not confident in diagnosing or repairing the issue, it\u2019s advisable to consult a professional mechanic to avoid further damage and ensure safety.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Does the P0B39 Code Mean? The OBD-II code P0B39 indicates a problem with the Motor Electronics Coolant Pump &#8220;B&#8221; Control Circuit, specifically showing that the circuit is operating at a low level. This code is primarily associated with hybrid vehicles, which utilize a dedicated coolant pump for their hybrid system. What Causes the P0B39 &hellip;<\/p>\n","protected":false},"author":26,"featured_media":91266,"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-78833","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 P0B39 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0B39 code, what causes Motor Electronics Coolant Pump &quot;B&quot; Control Circuit Low, 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\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0B39 OBD2: Motor Electronics Coolant Pump &quot;B&quot; Control Circuit Low\" \/>\n<meta property=\"og:description\" content=\"What Does the P0B39 Code Mean? The OBD-II code P0B39 indicates a problem with the Motor Electronics Coolant Pump &quot;B&quot; Control Circuit, specifically showing\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low\" \/>\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=\"2025-07-24T20:16:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-24T20:31:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low.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\\\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P0B39 OBD2: Motor Electronics Coolant Pump &#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\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/07\/p0b39-obd2-motor-electronics-coolant-pump-b-control-circuit-low-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 P0B39 Code Mean? The OBD-II code P0B39 indicates a problem with the Motor Electronics Coolant Pump &#8220;B&#8221; Control Circuit, specifically showing that the circuit is operating at a low level. This code is primarily associated with hybrid vehicles, which utilize a dedicated coolant pump for their hybrid system. 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