{"id":10894,"date":"2021-08-06T02:18:00","date_gmt":"2021-08-06T09:18:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=10894"},"modified":"2024-05-29T01:18:25","modified_gmt":"2024-05-29T08:18:25","slug":"p0121-code-throttle-pedal-position-sensor-a-circuit-range-performance-problem","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0121-code-throttle-pedal-position-sensor-a-circuit-range-performance-problem\/","title":{"rendered":"P0121 Code: Throttle\/Pedal Position Sensor &#8220;A&#8221; Circuit Range\/Performance Problem"},"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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_4cb91c-bd > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_4cb91c-bd > .kt-inside-inner-col,.kadence-column_4cb91c-bd > .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_4cb91c-bd > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_4cb91c-bd > .kt-inside-inner-col{flex-direction:column;}.kadence-column_4cb91c-bd > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_4cb91c-bd > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_4cb91c-bd{position:relative;}@media all and (max-width: 1024px){.kadence-column_4cb91c-bd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_4cb91c-bd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_4cb91c-bd qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-7d9bc3  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-e75997\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_a7becc-e4, .wp-block-kadence-advancedheading.kt-adv-heading_a7becc-e4[data-kb-block=\"kb-adv-heading_a7becc-e4\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_a7becc-e4 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_a7becc-e4[data-kb-block=\"kb-adv-heading_a7becc-e4\"] 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_a7becc-e4 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_a7becc-e4[data-kb-block=\"kb-adv-heading_a7becc-e4\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_a7becc-e4 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_a7becc-e4\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>P0121 stands for &ldquo;Throttle\/Pedal Position Sensor &ldquo;A&rdquo; Circuit Range\/Performance Problem.&rdquo; It&rsquo;s when the modules detect that the throttle position sensor is operating outside a predetermined range.<\/li><li>The code is usually caused by a defective throttle position sensor, a faulty TP sensor circuit, or issues with the throttle body.<\/li><li>Some of its symptoms include ignition difficulties, engine stalling, and rough idling.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The error code P0121 may indicate an issue related to your engine&rsquo;s throttle position sensor. Let&rsquo;s take a look at code P0121 and its other potential consequences.  <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0121 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0121 stands for &ldquo;Throttle\/Pedal Position Sensor &ldquo;A&rdquo; Circuit Range\/Performance Problem.&rdquo; The ECM\/PCM stores this code (or some other similar codes) if the module detects that the Throttle Position Sensor is operating outside of a predetermined range. <\/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\/2020\/06\/throttle-position-sensor-1024x816.jpeg\" alt=\"throttle position sensor\" class=\"wp-image-10903\" width=\"1024\" height=\"816\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/throttle-position-sensor-1024x816.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/throttle-position-sensor-300x239.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/throttle-position-sensor-768x612.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/throttle-position-sensor.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A throttle position sensor operating outside of a predetermined range can trigger code P0121.<\/figcaption><\/figure>\n\n\n\n<p>Also, on some vehicles, the code may be set when the TP and manifold absolute pressure (MAP) signals do not agree. <\/p>\n\n\n\n<p><em><strong>Note:<\/strong> Although code P0121 is a generic code specified by the Society of Automotive Engineers (SAE), the code&rsquo;s definition may be different depending on the vehicle manufacturer. <\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is a Throttle Position Sensor?<\/h3>\n\n\n\n<p>The throttle position (TP) sensor measures how much the engine&rsquo;s throttle blade is open. Older vehicles with mechanical throttle linkage have just one TP sensor, whereas newer vehicles with electronic throttle control (ETC) have two. You&rsquo;ll find the sensor(s) located on the <a href=\"https:\/\/www.carparts.com\/throttle-body\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle body assembly\">throttle body assembly<\/a>. <\/p>\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<p><strong>For an advanced, technical description of different configurations of throttle position sensors, as well as how the sensor can trigger an OBD code like P0121 read our discussion <a href=\"https:\/\/www.carparts.com\/blog\/p0122-code-throttle-position-sensor-switch-a-circuit-low-input\/#A_Closer_Look_at_Throttle_Position_Sensors\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"here\">here<\/a>.<\/strong><\/p>\n\n\n\n<p>You&rsquo;ll notice that the code also mentions a pedal position sensor. This indicates that, on some vehicles, the code may point to a problem with the accelerator pedal position (APP) sensor, rather than the TP sensor. In an ETC system, the control module uses a pair of APP sensors as a primary input for control of the throttle motor\/ throttle blade. <\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/car-throttle-body-1024x680.jpeg\" alt=\"car throttle body\" class=\"wp-image-10907\" width=\"1024\" height=\"680\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/car-throttle-body-1024x680.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/car-throttle-body-300x199.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/car-throttle-body-768x510.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/car-throttle-body.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A faulty throttle body is one of the common causes of code P0121.<\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\">What Causes a P0121 Code?<\/h2>\n\n\n\n<p>Several factors contribute to the trouble code P0121. Below is a list of common causes.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/bad-throttle-position-sensor-symptoms-what-you-need-to-know\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Defective throttle position sensor\">Defective throttle position sensor<\/a><\/li><li>Fault in the TP sensor circuit <\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/bad-throttle-body-symptoms\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Problem with the throttle body\">Problem with the throttle body<\/a><\/li><li>Problems with other sensors (e.g., MAP and MAF sensors)<\/li><li>Issues with the control module (e.g., software in need of update)<\/li><li>Faulty <a href=\"https:\/\/www.carparts.com\/accelerator-pedal-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"APP sensor\">APP sensor<\/a> <\/li><li>Fault in the APP circuit <\/li><\/ul>\n\n\n\n<p><em><strong>Note: <\/strong>If there are other <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"codes\">codes<\/a> stored in addition to P0121, the causes and symptoms may differ from those listed here. <\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0121 Code?<\/h2>\n\n\n\n<p>When code P0121 is set, you may notice one or more of the following symptoms: <\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The <a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light is on\">check engine light is on<\/a><\/li><li>The engine might be hard to start<\/li><li>The engine may hesitate during acceleration<\/li><li>The engine may stall<\/li><li>The engine may run rough or not idle correctly <\/li><li>The vehicle may be stuck in &ldquo;reduced power&rdquo; mode or fail-safe mode<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0121 Code<\/h2>\n\n\n\n<p>Because P0121 has many potential causes, it&rsquo;s best to leave the diagnosis to a professional. But if you decide to troubleshoot the code yourself, the video below will give you an idea of what might be involved: <\/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=\"How to test a throttle position sensor (P0121, P0122) GM wiring integrity\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/h17kYyFrExE?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 P0121 Code<\/h2>\n\n\n\n<p>Code P0121 has many potential causes&mdash;and many potential fixes. Some diagnostic work is needed to determine the correct route toward a proper repair. <\/p>\n\n\n\n<p>With that said, only vehicle owners with sufficient technical knowledge should attempt DIY fixes on a vehicle with a P0121 code. Otherwise, bring the vehicle to the nearest auto repair shop and get a trained professional to repair the problem. <\/p>\n\n\n\n<p>If you do decide to tackle the P0121 fix yourself, keep in mind that different types of vehicles may require their own distinct solutions&mdash;so always consult the appropriate repair information for your application. <\/p>\n\n\n\n<p>Repair manuals, such as those from Chilton, are useful, but an ALLDATA subscription is even better. ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Buying a New Throttle Position Sensor to Fix DTC P0121<\/h2>\n\n\n\n<p>One of the best and most reliable ways to fix DTC P0121 is to replace a bad <a href=\"https:\/\/www.carparts.com\/throttle-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle position sensor\">throttle position sensor<\/a>. Failing to address this problem could lead to problems with ignition, engine stalling, and rough idling. On the bright side, you can get a replacement sensor easily thanks to <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>We only source our sensors from the most trusted manufacturers in the industry before delivering them to you at affordable prices. Since our warehouses are strategically located all over the US, you can receive your order within days.<\/p>\n\n\n\n<p>It&rsquo;s ill-advised to drive if your vehicle logs DTC P0121 so it&rsquo;s important to get the problem addressed as soon as possible. Browse our collection of high-quality replacement parts, and shop for a new throttle position sensor today!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n<!-- start of editable content -->\n\n<a href=\"https:\/\/www.carparts.com\/throttle-position-sensor\" target=\"_blank\" aria-label=\"Throttle Position Sensor\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/kit1-010319-03-a_1\">\n<strong>Throttle Position Sensor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/throttle-body\" target=\"_blank\" aria-label=\"Throttle Body\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/rc31500003_1\">\n<strong>Throttle Body<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/accelerator-pedal-position-sensor\" target=\"_blank\" aria-label=\"Accelerator Pedal Position Sensor\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/rc32160001_1\">\n<strong>Accelerator Pedal Position Sensor<\/strong>\n<\/a>\n\n<!-- end of editable content -->\n\n<\/div>\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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The error code P0121 may indicate an issue related to your engine&rsquo;s throttle position sensor. Let&rsquo;s take a look at&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0121-code-throttle-pedal-position-sensor-a-circuit-range-performance-problem\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":10901,"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":[1680,1679],"ppma_author":[2607,2985],"class_list":{"0":"post-10894","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-accelerator-pedal-position-sensor","9":"tag-throttle-position-sensor","10":"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>P0121 Code: Throttle\/Pedal Position Sensor &quot;A&quot; Circuit Range\/Performance Problem - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"The P0121 code might indicate an issue related to the engine&#039;s throttle position sensor. Learn more about this code with this quick guide.\" \/>\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\/p0121-code-throttle-pedal-position-sensor-a-circuit-range-performance-problem\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0121 Code: Throttle\/Pedal Position Sensor &quot;A&quot; Circuit Range\/Performance Problem - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"The P0121 code might indicate an issue related to the engine&#039;s throttle position sensor. Learn more about this code with this quick guide.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0121-code-throttle-pedal-position-sensor-a-circuit-range-performance-problem\/\" \/>\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=\"2021-08-06T09:18:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-29T08:18:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/06\/throttle-position-sensor-automotive.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\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=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0121-code-throttle-pedal-position-sensor-a-circuit-range-performance-problem\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0121-code-throttle-pedal-position-sensor-a-circuit-range-performance-problem\\\/\"},\"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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