{"id":78339,"date":"2025-08-15T14:55:06","date_gmt":"2025-08-15T19:55:06","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78339"},"modified":"2025-08-15T15:07:19","modified_gmt":"2025-08-15T20:07:19","slug":"p0842-obd2-transmission-fluid-pressure-sensor-switch-a-circuit-low","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0842-obd2-transmission-fluid-pressure-sensor-switch-a-circuit-low","title":{"rendered":"P0842 OBD2: Transmission Fluid Pressure Sensor\/Switch &#8220;A&#8221; Circuit Low"},"content":{"rendered":"<h2>What Does the P0842 Code Mean?<\/h2>\n<p>OBD-II Code P0842 is defined as a Transmission Fluid Pressure Sensor\/Switch &#8220;A&#8221; Circuit Low. This code indicates that the engine&#8217;s control module (PCM) or Transmission Control Module (TCM) has detected an issue related to the transmission fluid pressure switch.<\/p>\n<h2>What Causes the P0842 Code?<\/h2>\n<p>The causes of the P0842 code can vary, but typically include:<\/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 affecting the sensor or TCM<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0842 Code?<\/h2>\n<p>Drivers may experience several symptoms when the P0842 code is present, including:<\/p>\n<ul>\n<li>Increased fuel consumption<\/li>\n<li>Transmission may not shift properly<\/li>\n<\/ul>\n<h2>How Serious Is the P0842 Code?<\/h2>\n<p>The P0842 code is classified as urgent and indicates that immediate action is necessary. Ignoring this code can lead to severe damage to the vehicle&#8217;s transmission system, affecting overall vehicle safety and driving performance.<\/p>\n<h2>How to Diagnose the P0842 Code<\/h2>\n<p>A proper diagnosis for the P0842 code involves:<\/p>\n<ul>\n<li>Using an OBD-II scanner to confirm the code<\/li>\n<li>Checking transmission fluid levels and condition<\/li>\n<li>Inspecting wiring and connectors for damage or corrosion<\/li>\n<li>Testing the transmission fluid pressure sensor for functionality<\/li>\n<li>Verifying the operation of the TCM<\/li>\n<\/ul>\n<h2>Common Repairs for the P0842 Code<\/h2>\n<p>Repairs 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 transmission fluid to the proper level<\/li>\n<li>Replacing the Transmission Control Module (TCM) if necessary<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0842 Code?<\/h2>\n<p>The cost to fix the P0842 code can vary widely based on the specific issue. Basic repairs, like changing the transmission fluid, might cost around $100-$200, while replacing the TCM can range from $500 to over $1000, depending on the vehicle make and model.<\/p>\n<h2>Can I Fix the P0842 Code Myself?<\/h2>\n<p>While some DIY enthusiasts may be able to handle basic repairs, such as checking fluid levels or replacing a sensor, diagnosing and fixing the underlying issues related to the TCM or wiring should be performed by a professional to ensure safety and proper functionality.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Does the P0842 Code Mean? OBD-II Code P0842 is defined as a Transmission Fluid Pressure Sensor\/Switch &#8220;A&#8221; Circuit Low. This code indicates that the engine&#8217;s control module (PCM) or Transmission Control Module (TCM) has detected an issue related to the transmission fluid pressure switch. What Causes the P0842 Code? The causes of the P0842 &hellip;<\/p>\n","protected":false},"author":26,"featured_media":92881,"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-78339","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 P0842 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0842 code, what causes transmission fluid pressure sensor\/switch &quot;A&quot; 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\/p0842-obd2-transmission-fluid-pressure-sensor-switch-a-circuit-low\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0842 OBD2: Transmission Fluid Pressure Sensor\/Switch &quot;A&quot; Circuit Low\" \/>\n<meta property=\"og:description\" content=\"What Does the P0842 Code Mean? OBD-II Code P0842 is defined as a Transmission Fluid Pressure Sensor\/Switch &quot;A&quot; Circuit Low. 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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\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-circuit-low-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0842-obd2-transmission-fluid-pressure-sensorswitch-a-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 P0842 Code Mean? OBD-II Code P0842 is defined as a Transmission Fluid Pressure Sensor\/Switch &#8220;A&#8221; Circuit Low. This code indicates that the engine&#8217;s control module (PCM) or Transmission Control Module (TCM) has detected an issue related to the transmission fluid pressure switch. What Causes the P0842 Code? The causes of the P0842&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78339","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=78339"}],"version-history":[{"count":3,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78339\/revisions"}],"predecessor-version":[{"id":92925,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78339\/revisions\/92925"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/92881"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=78339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=78339"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=78339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}