{"id":71337,"date":"2022-09-06T00:11:11","date_gmt":"2022-09-06T07:11:11","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=71337"},"modified":"2023-09-04T20:54:42","modified_gmt":"2023-09-05T03:54:42","slug":"p0843-code-transmission-fluid-pressure-sensor-switch-a-circuit-high","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0843-code-transmission-fluid-pressure-sensor-switch-a-circuit-high\/","title":{"rendered":"P0843 Code: Transmission Fluid Pressure Sensor \/ Switch \u201cA\u201d Circuit High"},"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\"> 2<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_651ece-08 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_651ece-08 > .kt-inside-inner-col,.kadence-column_651ece-08 > .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_651ece-08 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_651ece-08 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_651ece-08 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_651ece-08 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_651ece-08{position:relative;}@media all and (max-width: 1024px){.kadence-column_651ece-08 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_651ece-08 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_651ece-08 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-df1883  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-d1d24a\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_a9f770-c6, .wp-block-kadence-advancedheading.kt-adv-heading_a9f770-c6[data-kb-block=\"kb-adv-heading_a9f770-c6\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_a9f770-c6 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_a9f770-c6[data-kb-block=\"kb-adv-heading_a9f770-c6\"] 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_a9f770-c6 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_a9f770-c6[data-kb-block=\"kb-adv-heading_a9f770-c6\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_a9f770-c6 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_a9f770-c6\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>DTC P0843 code stands for Transmission Fluid Sensor\/Switch &ldquo;A&rdquo; Circuit High. It&rsquo;s logged when the PCM or TCM receives a voltage signal from the TFPS that doesn&rsquo;t match the normal operating voltage.<\/li><li>Some issues that could trigger the P0843 code include a bad TFPS, a malfunctioning PCM (or TCM), and circuit-related issues.<\/li><li>Aside from an illuminated check engine light, your transmission might not shift properly or your vehicle might enter limp mode due to the trouble code.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>You may use a scan tool to try to figure out what could be wrong with your vehicle. If a P0843 code has been logged, you&rsquo;ll need to know about its definition, common causes, and common symptoms.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0843 Code Mean?<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Diagnostic trouble code (DTC)\">Diagnostic trouble code (DTC)<\/a> P0843 code stands for Transmission Fluid Sensor\/Switch &ldquo;A&rdquo; Circuit High. The powertrain control module (PCM) or transmission control module (TCM) triggers the P0843 code if it&nbsp;receives a voltage signal from the <a href=\"https:\/\/www.carparts.com\/automatic-transmission-oil-pressure-switch\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission fluid pressure switch (TFPS)\">transmission fluid pressure switch (TFPS)<\/a> that doesn&rsquo;t match the normal operating voltage. This can indicate that there&rsquo;s an issue with either the TFPS or its circuit. Sometimes, the code can also indicate an internal transmission concern.<\/p>\n\n\n\n<p>The TFPS is responsible for measuring hydraulic pressure inside the transmission, which is important because it gives the PCM some insight into whether the transmission is functioning as it should.<\/p>\n\n\n\n<p><em><strong>Note: <\/strong>The definition of the P0843 code can 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<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/checking-obd-code.png\" alt=\"checking obd code\" class=\"wp-image-71575\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/checking-obd-code.png 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/checking-obd-code-300x200.png 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/checking-obd-code-768x512.png 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/checking-obd-code-600x400.png 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/checking-obd-code-150x100.png 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Your PCM\/TCM triggers the P0843 code if it&nbsp;receives a voltage signal from the TFPS that doesn&rsquo;t match the normal operating voltage.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of the P0843 Code?<\/h2>\n\n\n\n<p>There are several things that can trigger the P0843 code including:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Failed TFPS<\/li><li>Circuit problems, such as a damaged <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wire\">wire<\/a> or poor connection<\/li><li>Failed PCM\/TCM<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0843 Code?<\/h2>\n\n\n\n<p>The P0843 code can develop the following symptoms:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Illuminated check engine light\">Illuminated check engine light<\/a><\/li><li>Transmission doesn&rsquo;t shift properly<\/li><li>Vehicle enters <a href=\"https:\/\/www.carparts.com\/blog\/web-stories\/what-is-limp-mode\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"limp mode\">limp mode<\/a><\/li><\/ul>\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<h2 class=\"wp-block-heading\">How to Diagnose the P0843 Code<\/h2>\n\n\n\n<p>If a P0843 code has been triggered, you can&rsquo;t automatically assume that it&rsquo;s caused by the common causes associated with it. You still need to determine the actual cause before you conduct any repairs. You risk fixing a completely functional component if you skip doing an accurate diagnosis.<\/p>\n\n\n\n<p>The diagnostic process typically involves tests and inspections that might require the use of specialized tools and knowledge. If you find that this might be difficult, then you should reach out to a professional mechanic.<\/p>\n\n\n\n<p>Interested to learn how to diagnose the problem on your own? Watch the video below to get an idea of what the process might involve:<\/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=\"P0843 2008 Honda Accord\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/QfwBUh4H71Y?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 P0843 Code<\/h2>\n\n\n\n<p>If you want to fix the problems associated with the P0843 code, then you need to know that there isn&rsquo;t a single procedure that will guarantee a fix. Vehicle designs can vary greatly from one model to another, so something that works for one vehicle model might not be applicable to another. Your course of action will depend on the diagnosis, which is why getting an accurate diagnosis is important.<\/p>\n\n\n\n<p>It&rsquo;s best to consult a professional mechanic if you don&rsquo;t have much experience diagnosing or fixing error codes.<\/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\"> 2<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>You may use a scan tool to try to figure out what could be wrong with your vehicle. If a&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0843-code-transmission-fluid-pressure-sensor-switch-a-circuit-high\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":71567,"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":[1887],"ppma_author":[2607,2855],"class_list":{"0":"post-71337","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-automatic-transmission-oil-pressure-switch","9":"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>P0843 Code: Transmission Fluid Pressure Sensor \/ Switch \u201cA\u201d Circuit High - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Looking for the definition, common problems and symptoms associated with the P0843 code? 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