{"id":64460,"date":"2022-01-11T22:45:10","date_gmt":"2022-01-12T06:45:10","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=64460"},"modified":"2024-12-19T05:09:55","modified_gmt":"2024-12-19T13:09:55","slug":"p2104-code-throttle-actuator-control-system-forced-idle","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2104-code-throttle-actuator-control-system-forced-idle\/","title":{"rendered":"P2104 Code: Throttle Actuator Control System\u4e00Forced Idle"},"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-column64460_9e9d62-83 > .kt-inside-inner-col,.kadence-column64460_9e9d62-83 > .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-column64460_9e9d62-83 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column64460_9e9d62-83 > .kt-inside-inner-col{flex-direction:column;}.kadence-column64460_9e9d62-83 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column64460_9e9d62-83 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column64460_9e9d62-83{position:relative;}@media all and (max-width: 1024px){.kadence-column64460_9e9d62-83 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column64460_9e9d62-83 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column64460_9e9d62-83 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-8a851b  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-d3330c\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading64460_a4913f-22, .wp-block-kadence-advancedheading.kt-adv-heading64460_a4913f-22[data-kb-block=\"kb-adv-heading64460_a4913f-22\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading64460_a4913f-22 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading64460_a4913f-22[data-kb-block=\"kb-adv-heading64460_a4913f-22\"] 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-heading64460_a4913f-22 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading64460_a4913f-22[data-kb-block=\"kb-adv-heading64460_a4913f-22\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading64460_a4913f-22 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading64460_a4913f-22\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The diagnostic trouble code (DTC) P2104 indicates &ldquo;Throttle Actuator Control System&#19968;Forced Idle.&rdquo;<\/li>\n\n\n\n<li>The powertrain control module (PCM) will store this code if it detects an abnormal signal from the components of the electronic throttle control (ETC) system.<\/li>\n\n\n\n<li>Common causes of the P2104 code include a faulty electronic throttle body, acceleration pedal position (APP) sensor assembly failure, and throttle position sensor failure.<\/li>\n\n\n\n<li>A vehicle that sets a P2104 code can show symptoms like decreased engine performance, an illuminated check engine light, and an illuminated anti-lock brake system (ABS) light.<\/li>\n\n\n\n<li>If the PCM detects any mismatch in the redundant signals from the potentiometers, it might take steps to restrict the vehicle&rsquo;s performance for safety reasons without storing a P2104 code.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The electronic throttle control (ETC) system electrically opens the throttle valve. It usually consists of <a href=\"https:\/\/www.carparts.com\/accelerator-pedal-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"accelerator pedal position (APP) sensors\">accelerator pedal position (APP) sensors<\/a>, an electronic <a href=\"https:\/\/www.carparts.com\/throttle-actuator\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle actuator\">throttle actuator<\/a>, <a href=\"https:\/\/www.carparts.com\/throttle-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle position (TP) sensors\">throttle position (TP) sensors<\/a>, and an electronic control unit.<\/p>\n\n\n\n<p>Once the powertrain control module (PCM) detects a problem with the ETC system, a P2104 code will be logged by on-board diagnostics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P2104 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) P2104 stands for &ldquo;Throttle Actuator Control System&#19968;Forced Idle.&rdquo;<\/p>\n\n\n\n<p>As the driver steps on the accelerator pedal, the APP sensors send a signal to the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> and let it know how much power is being requested from the driver. This allows the ETC system to open or close the throttle valve.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"670\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/01\/Accelerator-Pedal-Position-Sensor-1024x670.jpg\" alt=\"Accelerator Pedal Position Sensor image\" class=\"wp-image-80064\" style=\"width:1024px;height:670px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/01\/Accelerator-Pedal-Position-Sensor-1024x670.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/01\/Accelerator-Pedal-Position-Sensor-300x196.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/01\/Accelerator-Pedal-Position-Sensor-768x502.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/01\/Accelerator-Pedal-Position-Sensor-870x570.jpg 870w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/01\/Accelerator-Pedal-Position-Sensor-150x98.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/01\/Accelerator-Pedal-Position-Sensor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">As the driver steps on the accelerator pedal, the APP sensors send a signal to the PCM and let it know how much power is being requested from the driver.<\/figcaption><\/figure>\n\n\n\n<p>If the PCM detects an abnormal signal from any of the ETC system&rsquo;s components, the computer will set code P2104. This code can also be triggered when the throttle is not opening in proportion to the signal received from the APP sensors.<\/p>\n\n\n\n<p>Once the code is set, the vehicle&rsquo;s fail-safe or <a href=\"https:\/\/www.carparts.com\/blog\/web-stories\/what-is-limp-mode\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"limp home mode\">limp home mode<\/a> will kick in, limiting the available power from the engine to prevent unwanted acceleration. This mode usually causes limited engine speed (about 1200 to 1600 RPMs), little to no accelerator pedal response, and a <a href=\"https:\/\/www.carparts.com\/blog\/cruise-control-not-working-causes-and-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"disabled cruise control system\">disabled cruise control system<\/a>.<\/p>\n\n\n\n<p>If you&rsquo;re planning to diagnose or fix P2104 yourself, you can learn more in our technical discussion about <a href=\"#About_Electronic_Throttle_Body_System_Sensors\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"electronic throttle body system sensors\">electronic throttle body system sensors<\/a>.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code P2104 may 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<h2 class=\"wp-block-heading\">What are the Common Causes of the P2104 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faulty electronic <a href=\"https:\/\/www.carparts.com\/throttle-body\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle body\">throttle body<\/a><\/li>\n\n\n\n<li>APP sensor assembly failure<\/li>\n\n\n\n<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=\"Throttle position sensor failure\">Throttle position sensor failure<\/a><\/li>\n\n\n\n<li>Circuit issues, such as damaged <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wires\">wires<\/a> or a poor connection<\/li>\n\n\n\n<li>Issues with the PCM, such as software in need of an update<\/li>\n<\/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 the P2104 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Decreased engine performance<\/li>\n\n\n\n<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>\n\n\n\n<li>Illuminated ABS light<\/li>\n\n\n\n<li>Shifting problems<\/li>\n\n\n\n<li>Little to no throttle response<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P2104 Code<\/h2>\n\n\n\n<p>P2104 is a generic DTC that applies to OBD-II equipped vehicles. However, keep in mind that steps for diagnosis and repair may vary from one vehicle to another.<\/p>\n\n\n\n<p>It&rsquo;s a good idea to bring your vehicle to a licensed mechanic to ensure that the right diagnostic steps are followed. But if you&rsquo;re a seasoned DIYer who has enough knowledge on diagnosing engine codes, then you may go ahead and do it yourself.<\/p>\n\n\n\n<p>To help you out, here is a video that shows 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=\"2004 F150 P2111, P2104 Don't Overlook Basics\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/CpMc3oRUHsw?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 P2104 Code<\/h2>\n\n\n\n<p>Fixing a P2104 code can be confusing and frustrating if you don&rsquo;t have the right tools and know-how. If you plan to diagnose and repair the problem yourself, make sure you&rsquo;re equipped with the appropriate <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>. Both are excellent sources of vehicle-specific repair information, so you might want to check those out.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">About Electronic Throttle Body System Sensors&nbsp;<\/h2>\n\n\n\n<p>Electronic throttle body systems have redundant sensors on the accelerator pedal and redundant throttle position sensors on the throttle body for feedback purposes. The motor that drives the throttle plate doesn&rsquo;t just open the throttle, it closes it as well.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"456\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/2006-ford-explorer-ap-sensor-diagram-1024x456.jpg\" alt=\"diagram of a 2006 ford explorer ap sensor\" class=\"wp-image-80068\" style=\"width:1024px;height:456px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/2006-ford-explorer-ap-sensor-diagram-1024x456.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/2006-ford-explorer-ap-sensor-diagram-300x134.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/2006-ford-explorer-ap-sensor-diagram-768x342.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/2006-ford-explorer-ap-sensor-diagram-150x67.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/01\/2006-ford-explorer-ap-sensor-diagram.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The traces shown in this diagram are the three AP sensors on a 2006 Explorer. Notice that the voltages aren&rsquo;t the same for each sensor, but you can see how the pattern of each AP sensor follows the others. | Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>If the ECM\/PCM detects any mismatch in the redundant signals from any of the potentiometers (accelerator pedal sensors or throttle position sensors), throttle control will be lost and the engine will only idle, but most platforms won&rsquo;t store code P2104. Since 1994, Power Stroke diesels have been programmed to lose throttle response and idle if the idle validation switch and the TP sensor on the accelerator pedal assembly disagree.<\/p>\n\n\n\n<p>On a gas burner, if an intake manifold vacuum leak causes an elevated idle concern, the ECM\/PCM will close the throttle plate, and if the idle remains elevated, the ECM\/PCM will, on some platforms, de-energize the injectors.<\/p>\n\n\n\n<p>It&rsquo;s all about protecting the driver and passengers from disaster.<\/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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The electronic throttle control (ETC) system electrically opens the throttle valve. It usually consists of accelerator pedal position (APP) sensors,&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p2104-code-throttle-actuator-control-system-forced-idle\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":64581,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"_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":[1680,2094,1679],"ppma_author":[2607,2985],"class_list":{"0":"post-64460","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-actuator","10":"tag-throttle-position-sensor","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P2104 Code: Throttle Actuator Control System\u4e00Forced Idle - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what a P2104 code means, its common symptoms as well as its usual causes. 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