{"id":71360,"date":"2022-09-01T23:50:49","date_gmt":"2022-09-02T06:50:49","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=71360"},"modified":"2023-09-04T20:32:50","modified_gmt":"2023-09-05T03:32:50","slug":"p0638-code-throttle-actuator-control-range-performance-bank-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0638-code-throttle-actuator-control-range-performance-bank-1\/","title":{"rendered":"P0638 Code: Throttle Actuator Control Range \/ Performance (Bank 1)"},"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_d3a936-85 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_d3a936-85 > .kt-inside-inner-col,.kadence-column_d3a936-85 > .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_d3a936-85 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_d3a936-85 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_d3a936-85 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_d3a936-85 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_d3a936-85{position:relative;}@media all and (max-width: 1024px){.kadence-column_d3a936-85 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_d3a936-85 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_d3a936-85 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-7a1ae0  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-a0d001\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_434574-1e, .wp-block-kadence-advancedheading.kt-adv-heading_434574-1e[data-kb-block=\"kb-adv-heading_434574-1e\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_434574-1e mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_434574-1e[data-kb-block=\"kb-adv-heading_434574-1e\"] 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_434574-1e img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_434574-1e[data-kb-block=\"kb-adv-heading_434574-1e\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_434574-1e summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_434574-1e\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>A logged P0638 code means that the PCM has detected that the throttle actuator is not in the right position.<\/li><li>A faulty throttle body assembly, defective throttle position sensor, wiring issues, and a faulty PCM can trigger this code.<\/li><li>If this code is present, the engine could stall, run rough, or stay in limp mode.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>On vehicles with electronic throttle control, the <a href=\"https:\/\/www.carparts.com\/throttle-actuator\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle (ETC) actuator\">throttle (ETC) actuator<\/a> controls the engine&rsquo;s air intake. It makes sure that the right amount of air enters the engine to mix with the fuel for efficient energy production. Too much air will result in a lean fuel-air mixture, while too little air leads to the engine running rich.<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> (PCM) monitors the throttle actuator&rsquo;s movement. It will log a P0638 code if it detects that the actuator is not in the position it should be in.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0638 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) P0638 stands for &ldquo;Throttle Actuator Control Range\/Performance.&rdquo;<\/p>\n\n\n\n<p>The throttle actuator is a modern version of the <a href=\"https:\/\/www.carparts.com\/throttle-body\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle body\">throttle body<\/a>, a device at the inlet of the <a href=\"https:\/\/www.carparts.com\/intake-manifold\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"intake manifold\">intake manifold<\/a> with a butterfly valve inside it. In a drive-by-wire system, the actuator is fully computerized and dispenses with physical cables.<\/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\/08\/Replacement-Part-Throttle-Position-Sensor-1024x602.jpg\" alt=\"Replacement Part Throttle Position Sensor\" class=\"wp-image-71984\" width=\"1024\" height=\"602\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/Replacement-Part-Throttle-Position-Sensor-1024x602.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/Replacement-Part-Throttle-Position-Sensor-300x176.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/Replacement-Part-Throttle-Position-Sensor-768x452.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/Replacement-Part-Throttle-Position-Sensor-1536x904.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/Replacement-Part-Throttle-Position-Sensor-150x88.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/Replacement-Part-Throttle-Position-Sensor.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The throttle position sensor keeps the PCM informed about the throttle actuator being open.<\/figcaption><\/figure>\n\n\n\n<p>The throttle actuator typically has two throttle position sensors. The <a href=\"https:\/\/www.carparts.com\/throttle-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle position sensor\">throttle position sensor<\/a> keeps the PCM informed about the throttle actuator being open. The throttle position sensors, together with one or more <a href=\"https:\/\/www.carparts.com\/accelerator-pedal-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"accelerator pedal sensors\">accelerator pedal sensors<\/a>, provide the PCM with information regarding the desired and actual throttle position.<\/p>\n\n\n\n<p>The PCM uses the information to adjust how much fuel the injectors spray, among other things. If it doesn&rsquo;t get the right response from the actuator, it will set the powertrain code P0638.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0638 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 the P0638 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/bad-throttle-body-symptoms\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty throttle body assembly\">Faulty throttle body assembly<\/a><\/li><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=\"Bad throttle position sensor\">Bad throttle position sensor<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Wiring problems\">Wiring problems<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Bad PCM\">Bad PCM<\/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 the P0638 Code?<\/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>Engine performance problems, such as rough running and <a href=\"https:\/\/www.carparts.com\/blog\/car-shuts-off-while-driving-causes-what-to-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"stalling\">stalling<\/a><\/li><li>Vehicle stuck in <a href=\"https:\/\/www.carparts.com\/blog\/what-triggers-reduced-engine-power\/#Reduced_Engine_Power_Mode\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"&ldquo;limp&rdquo; mode\">&ldquo;limp&rdquo; mode<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0638 Code<\/h2>\n\n\n\n<p>The P0638 code is a generic trouble code, which means vehicles made by different auto manufacturers can log it. The affected vehicles can exhibit similar symptoms, but that doesn&rsquo;t mean that they share the same steps for diagnosing the code. The process can vary depending on the make and model.<\/p>\n\n\n\n<p>If you&rsquo;re not confident about conducting diagnostic tests on your vehicle, it&rsquo;s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here are some videos that can give you 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-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Drive-By-Wire or Electronic Throttle Actuator\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/fXe1p4DAw8A?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<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=\"Audi P0638, PWM\/Duty cycle explained\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/yxjcBO4V8Uk?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 P0638 Code<\/h2>\n\n\n\n<p>Fixing the P0638 code can be tricky, especially if you don&rsquo;t have the right tools and know-how. So if you&rsquo;re not confident that you can do it yourself, take your vehicle to an auto repair shop and let professionals resolve the issue.<\/p>\n\n\n\n<p>But if you&rsquo;re a DIYer with in-depth automotive know-how, you can go ahead and resolve the P0638 code on your own. 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> before you get started.<\/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>On vehicles with electronic throttle control, the throttle (ETC) actuator controls the engine&rsquo;s air intake. It makes sure that the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0638-code-throttle-actuator-control-range-performance-bank-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":71985,"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":[1680,1323,1186,2094,1615,1679],"ppma_author":[2607,2855],"class_list":{"0":"post-71360","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-engine-control-module-2","10":"tag-intake-manifold","11":"tag-throttle-actuator","12":"tag-throttle-body","13":"tag-throttle-position-sensor","14":"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>P0638 Code: Throttle Actuator Control Range \/ Performance (Bank 1) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn the definition of the P0638 code, its possible causes and common symptoms. Find out what to do if you have this code on your scanner.\" \/>\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\/p0638-code-throttle-actuator-control-range-performance-bank-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0638 Code: Throttle Actuator Control Range \/ Performance (Bank 1) - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn the definition of the P0638 code, its possible causes and common symptoms. Find out what to do if you have this code on your scanner.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0638-code-throttle-actuator-control-range-performance-bank-1\/\" \/>\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=\"2022-09-02T06:50:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-05T03:32:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/08\/new-replacement-throttle-actuator-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1366\" \/>\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\\\/p0638-code-throttle-actuator-control-range-performance-bank-1\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0638-code-throttle-actuator-control-range-performance-bank-1\\\/\"},\"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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