{"id":74841,"date":"2022-10-09T19:12:23","date_gmt":"2022-10-10T02:12:23","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=74841"},"modified":"2023-09-04T22:33:29","modified_gmt":"2023-09-05T05:33:29","slug":"p0848-code-transmission-fluid-pressure-sensor-switch-b-circuit-high","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0848-code-transmission-fluid-pressure-sensor-switch-b-circuit-high\/","title":{"rendered":"P0848 Code: Transmission Fluid Pressure Sensor\/Switch &#8220;B&#8221; 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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_ba5a93-ae > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_ba5a93-ae > .kt-inside-inner-col,.kadence-column_ba5a93-ae > .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_ba5a93-ae > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_ba5a93-ae > .kt-inside-inner-col{flex-direction:column;}.kadence-column_ba5a93-ae > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_ba5a93-ae > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_ba5a93-ae{position:relative;}@media all and (max-width: 1024px){.kadence-column_ba5a93-ae > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_ba5a93-ae > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_ba5a93-ae qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-fdcb85  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-eb9319\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_5625cd-f5, .wp-block-kadence-advancedheading.kt-adv-heading_5625cd-f5[data-kb-block=\"kb-adv-heading_5625cd-f5\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_5625cd-f5 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_5625cd-f5[data-kb-block=\"kb-adv-heading_5625cd-f5\"] 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_5625cd-f5 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_5625cd-f5[data-kb-block=\"kb-adv-heading_5625cd-f5\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_5625cd-f5 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_5625cd-f5\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P0848 code stands for &ldquo;Transmission Fluid Pressure Sensor\/Switch &ldquo;B&rdquo; Circuit High.&rdquo;<\/li><li>It&rsquo;s set when the &ldquo;B&rdquo; input readings from the TFP sensor doesn&rsquo;t match the normal operating voltages programmed into the PCM&rsquo;s memory.<\/li><li>Some common causes include low transmission fluid level, a bad transmission fluid pressure sensor, a wiring problem, a faulty TCM, or an internal valve body or transmission problem.<\/li><li>Symptoms to look out for include an illuminated check engine light, poor fuel economy, and trouble shifting between gears correctly.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/auto-trans-oil-pressure-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission fluid pressure sensor\">transmission fluid pressure sensor<\/a> measures the hydraulic fluid pressure inside the transmission. Using the readings from this sensor, the <a href=\"https:\/\/www.carparts.com\/transmission-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission control module\">transmission control module<\/a> (TCM) or <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> (PCM) adjusts various outputs to ensure the efficient operation of the transmission.<\/p>\n\n\n\n<p>If the PCM or TCM finds a problem with the transmission <a href=\"https:\/\/www.carparts.com\/oil-pressure-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fluid pressure sensor\">fluid pressure sensor<\/a> or its circuit, its diagnostics will log a P0848 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0848 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\">Diagnostic trouble code<\/a> (DTC) P0848 indicates &ldquo;Transmission Fluid Pressure Sensor\/Switch &ldquo;B&rdquo; Circuit High.&rdquo;<\/p>\n\n\n\n<p>Hydraulic fluid applies pressure inside the transmission. The transmission fluid pressure sensor converts that pressure into an electrical signal and sends it to the TCM or PCM.<\/p>\n\n\n\n<p>When other controllers need the readings from the TFP sensor to operate, the PCM will share the information over the data communication bus.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/transmission-fluid-pressure-sensor-causing-p0848-code-1024x602.jpg\" alt=\"transmission fluid pressure sensor causing p0848 code\" class=\"wp-image-74842\" width=\"1024\" height=\"602\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/transmission-fluid-pressure-sensor-causing-p0848-code-1024x602.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/transmission-fluid-pressure-sensor-causing-p0848-code-300x176.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/transmission-fluid-pressure-sensor-causing-p0848-code-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/transmission-fluid-pressure-sensor-causing-p0848-code-1536x904.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/transmission-fluid-pressure-sensor-causing-p0848-code-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/transmission-fluid-pressure-sensor-causing-p0848-code.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The transmission fluid pressure sensor converts that pressure into an electrical signal and sends it to the TCM or PCM.<\/figcaption><\/figure>\n\n\n\n<p>The PCM will use the data to determine the right transmission operation pressure or timing for when the transmission shifts between gears. In technical terms, this is the &ldquo;B&rdquo; input.<\/p>\n\n\n\n<p>The PCM regularly checks the transmission fluid pressure sensor and compares the &ldquo;B&rdquo; input readings with the normal operating voltages programmed into its memory. If the signal&rsquo;s voltage doesn&rsquo;t match the correct values, the computer will set the powertrain and engine code P0848.<\/p>\n\n\n\n<p>P0848 often (but not always) concerns the electrical circuit.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0848 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of a Code P0848?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/how-to-check-automatic-transmission-fluid\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Low transmission fluid level\">Low transmission fluid level<\/a><\/li><li>Bad transmission fluid pressure sensor<\/li><li>Problems with the transmission fluid pressure sensor wiring<\/li><li>Faulty TCM<\/li><li>Internal <a href=\"https:\/\/www.carparts.com\/blog\/transmission-valve-body-what-it-is-how-it-works-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"valve body\">valve body<\/a> or <a href=\"https:\/\/www.carparts.com\/blog\/bad-automatic-transmission-symptoms-repair-cost-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission problems\">transmission problems<\/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\">What are the Common Symptoms of a Code P0848?<\/h2>\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>More fuel consumed<\/li><li>Transmission doesn&rsquo;t shift between gears correctly<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0848 Code<\/h2>\n\n\n\n<p>Many vehicle makes and models can develop issues that might lead to the PCM or TCM issuing a P0848 code. The exact reason behind the powertrain code can vary on a case-by-case basis, so there is no single approach that can diagnose it.<\/p>\n\n\n\n<p>If you lack the confidence to run a diagnostic test on your vehicle&rsquo;s transmission fluid pressure sensor, it&rsquo;s best to take it to an auto repair shop. Otherwise, you can diagnose the issue yourself. To give you a better idea of what to do and expect, here is a helpful video on checking the P0848 code:<\/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=\"Transmission Not Shifting P0848 -'08 Honda Civic\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/tf_IyaeV1iw?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 P0848 Code<\/h2>\n\n\n\n<p>You will need the right tools and know-how to evaluate the transmission fluid pressure sensor and other parts covered by the P0848 code. If you don&rsquo;t have those, it&rsquo;s best to leave the job to professionals.<\/p>\n\n\n\n<p>DIYers with advanced technical knowledge and hands-on experience can consult a vehicle-specific <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or online repair database\">repair manual or online repair database<\/a> to make their task easier.<\/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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The transmission fluid pressure sensor measures the hydraulic fluid pressure inside the transmission. Using the readings from this sensor, the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0848-code-transmission-fluid-pressure-sensor-switch-b-circuit-high\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":74843,"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":[2158,3167,1323,1838,1222],"ppma_author":[2607,2855],"class_list":{"0":"post-74841","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-auto-trans-oil-pressure-sensor","9":"tag-automatic-transmission-pressure-sensor","10":"tag-engine-control-module-2","11":"tag-oil-pressure-sensor","12":"tag-transmission-control-module","13":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0848 Code: Transmission Fluid Pressure Sensor\/Switch &quot;B&quot; Circuit High - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what a P0848 code means, the possible causes, and the common symptoms associated with it.\" \/>\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.carparts.com\/blog\/p0848-code-transmission-fluid-pressure-sensor-switch-b-circuit-high\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0848 Code: Transmission Fluid Pressure Sensor\/Switch &quot;B&quot; Circuit High - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what a P0848 code means, the possible causes, and the common symptoms associated with it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0848-code-transmission-fluid-pressure-sensor-switch-b-circuit-high\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-10T02:12:23+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-05T05:33:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/two-mechanics-working-on-p0848-code.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1333\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0848-code-transmission-fluid-pressure-sensor-switch-b-circuit-high\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0848-code-transmission-fluid-pressure-sensor-switch-b-circuit-high\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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