{"id":78342,"date":"2025-08-15T14:54:57","date_gmt":"2025-08-15T19:54:57","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78342"},"modified":"2025-08-15T14:54:57","modified_gmt":"2025-08-15T19:54:57","slug":"p0845-obd2-transmission-fluid-pressure-sensor-switch-b-circuit","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0845-obd2-transmission-fluid-pressure-sensor-switch-b-circuit","title":{"rendered":"P0845 OBD2: Transmission Fluid Pressure Sensor\/Switch &#8220;B&#8221; Circuit"},"content":{"rendered":"<p>OBD-II Code P0845 is related to the transmission fluid pressure sensor and indicates a malfunction within the vehicle&#8217;s transmission system. This code is critical for ensuring smooth gear shifts and overall transmission performance.<\/p>\n<h2>What Does the P0845 Code Mean?<\/h2>\n<p>OBD-II Code P0845 is defined as a Transmission Fluid Pressure Sensor\/Switch &#8220;B&#8221; Circuit. This code is triggered when the engine&#8217;s control module (PCM) or Transmission Control Module (TCM) detects an issue with the hydraulic fluid pressure switch that regulates the hydraulic fluid needed for effective gear shifting.<\/p>\n<h2>What Causes the P0845 Code?<\/h2>\n<p>The P0845 code can be caused by several factors, including:<\/p>\n<ul>\n<li>Transmission Control Module (TCM) failure<\/li>\n<li>Low transmission fluid level<\/li>\n<li>Failure of the transmission fluid pressure sensor<\/li>\n<li>Wiring issues related to the sensor or circuit<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0845 Code?<\/h2>\n<p>Symptoms of the P0845 code may include:<\/p>\n<ul>\n<li>Increased fuel consumption<\/li>\n<li>Transmission may not shift properly<\/li>\n<li>Unusual transmission noises<\/li>\n<\/ul>\n<h2>How Serious Is the P0845 Code?<\/h2>\n<p>The P0845 code is classified as urgent. Ignoring this issue can lead to severe damage to the transmission system, which may result in costly repairs or even complete transmission failure. Immediate attention is recommended to avoid further complications.<\/p>\n<h2>How to Diagnose the P0845 Code<\/h2>\n<p>Diagnosing the P0845 code involves a few steps:<\/p>\n<ol>\n<li>Use an OBD-II scanner to confirm the presence of the P0845 code and check for any other related codes.<\/li>\n<li>Inspect the transmission fluid level and condition.<\/li>\n<li>Examine the wiring and connectors for damage.<\/li>\n<li>Test the transmission fluid pressure sensor for proper operation.<\/li>\n<li>Check the Transmission Control Module (TCM) for faults.<\/li>\n<\/ol>\n<h2>Common Repairs for the P0845 Code<\/h2>\n<p>Repairs for the P0845 code may include:<\/p>\n<ul>\n<li>Replacing the transmission fluid pressure sensor<\/li>\n<li>Repairing or replacing damaged wiring or connectors<\/li>\n<li>Refilling or replacing low or contaminated transmission fluid<\/li>\n<li>Replacing the Transmission Control Module if found faulty<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0845 Code?<\/h2>\n<p>The cost to repair the P0845 code can vary widely depending on the underlying issue. Typically, you might expect to pay:<\/p>\n<ul>\n<li>Sensor replacement: $100 &#8211; $300<\/li>\n<li>Wiring repairs: $50 &#8211; $150<\/li>\n<li>Transmission fluid service: $80 &#8211; $200<\/li>\n<li>TCM replacement: $400 &#8211; $1,200<\/li>\n<\/ul>\n<h2>Can I Fix the P0845 Code Myself?<\/h2>\n<p>While some repairs, such as checking fluid levels or inspecting wiring, can be done by DIY enthusiasts, it is advisable to seek professional assistance for issues related to the Transmission Control Module or sensor replacement. Accurate diagnostics often require specialized tools and expertise.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>OBD-II Code P0845 is related to the transmission fluid pressure sensor and indicates a malfunction within the vehicle&#8217;s transmission system. This code is critical for ensuring smooth gear shifts and overall transmission performance. What Does the P0845 Code Mean? OBD-II Code P0845 is defined as a Transmission Fluid Pressure Sensor\/Switch &#8220;B&#8221; Circuit. This code is &hellip;<\/p>\n","protected":false},"author":26,"featured_media":92875,"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-78342","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 P0845 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0845 code, what causes transmission fluid pressure sensor issues, and how to diagnose and fix common problems to maintain optimal transmission 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\/p0845-obd2-transmission-fluid-pressure-sensor-switch-b-circuit\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0845 OBD2: Transmission Fluid Pressure Sensor\/Switch &quot;B&quot; Circuit\" \/>\n<meta property=\"og:description\" content=\"OBD-II Code P0845 is related to the transmission fluid pressure sensor and indicates a malfunction within the vehicle&#039;s transmission system. This code is\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0845-obd2-transmission-fluid-pressure-sensor-switch-b-circuit\" \/>\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=\"2025-08-15T19:54:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0845-obd2-transmission-fluid-pressure-sensorswitch-b-circuit.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\\\/p0845-obd2-transmission-fluid-pressure-sensor-switch-b-circuit#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0845-obd2-transmission-fluid-pressure-sensor-switch-b-circuit\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P0845 OBD2: Transmission Fluid Pressure Sensor\\\/Switch &#8220;B&#8221; 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This code is critical for ensuring smooth gear shifts and overall transmission performance. What Does the P0845 Code Mean? OBD-II Code P0845 is defined as a Transmission Fluid Pressure Sensor\/Switch &#8220;B&#8221; Circuit. 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