{"id":67868,"date":"2022-03-31T00:19:00","date_gmt":"2022-03-31T07:19:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=67868"},"modified":"2023-08-29T21:37:05","modified_gmt":"2023-08-30T04:37:05","slug":"p0633-code-immobilizer-key-not-programmed-ecm-pcm","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0633-code-immobilizer-key-not-programmed-ecm-pcm\/","title":{"rendered":"P0633 Code: Immobilizer Key not Programmed &#8211; ECM \/ PCM"},"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_c96d87-22 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_c96d87-22 > .kt-inside-inner-col,.kadence-column_c96d87-22 > .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_c96d87-22 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_c96d87-22 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_c96d87-22 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_c96d87-22 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_c96d87-22{position:relative;}@media all and (max-width: 1024px){.kadence-column_c96d87-22 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_c96d87-22 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_c96d87-22 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-3bbdca  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-27801a\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_b90641-1a, .wp-block-kadence-advancedheading.kt-adv-heading_b90641-1a[data-kb-block=\"kb-adv-heading_b90641-1a\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_b90641-1a mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_b90641-1a[data-kb-block=\"kb-adv-heading_b90641-1a\"] 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_b90641-1a img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_b90641-1a[data-kb-block=\"kb-adv-heading_b90641-1a\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_b90641-1a summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_b90641-1a\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The diagnostic trouble code (DTC) P0633 stands for &ldquo;Immobilizer Key not Programmed &ndash; ECM\/PCM.&rdquo;<\/li><li>This code is set when the PCM detects an unknown transponder signal.<\/li><li>The P0633 code can be logged because of a bad anti-theft control module, an ignition key that isn&rsquo;t programmed to the vehicle, and wiring problems.<\/li><li>When this code is logged, the anti-theft light will be activated and your engine may not start.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The immobilizer key is one of the security measures that protect your vehicle from thieves. It replaces the traditional metal key that you insert into the <a href=\"https:\/\/www.carparts.com\/door-lock-cylinder\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"door lock cylinders\">door lock cylinders<\/a> and ignition cylinder. <a href=\"https:\/\/www.carparts.com\/blog\/web-stories\/tiktok-hyundai-kia-challenge\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Without the immobilizer\">Without the immobilizer<\/a> key, you cannot lock, unlock, start, and turn off your vehicle.<\/p>\n\n\n\n<p>If you try to start the vehicle with an ignition key that isn&rsquo;t programmed into the anti-theft control module, its diagnostics will log a P0633 code and the anti-theft light will switch on.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0633 Code Mean?<\/h2>\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\/03\/car-key-being-inserted-into-door-lock-cylinder-1024x683.jpg\" alt=\"car key being inserted into door lock cylinder\" class=\"wp-image-67885\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-key-being-inserted-into-door-lock-cylinder-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-key-being-inserted-into-door-lock-cylinder-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-key-being-inserted-into-door-lock-cylinder-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-key-being-inserted-into-door-lock-cylinder-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-key-being-inserted-into-door-lock-cylinder-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-key-being-inserted-into-door-lock-cylinder-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-key-being-inserted-into-door-lock-cylinder-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The immobilizer key is one of the security measures that protect your vehicle from thieves.<\/figcaption><\/figure>\n\n\n\n<p>The <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) P0633 indicates &ldquo;Immobilizer Key not Programmed &ndash; ECM\/PCM.&rdquo;<\/p>\n\n\n\n<p>The immobilizer key fob contains a transponder that emits an electronic signal and runs on a small internal battery. When the key fob comes within range of your vehicle, it sends the signal to controllers like the engine control module (ECM) or powertrain control module (PCM).<\/p>\n\n\n\n<p>If everything is working properly, the car&rsquo;s computer unlocks the doors and enables the push-to-start button. Conversely, moving the immobilizer key out of reach of the vehicle does the opposite&mdash;the doors lock and the push-to-start button is deactivated.<\/p>\n\n\n\n<p>Each immobilizer key has a transponder signal that only it possesses. The signal for your car&rsquo;s stock key is programmed into the relevant controllers&mdash;the <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ECM\/PCM\">ECM\/PCM<\/a>, the anti-theft control module, and the body control module (BCM).<\/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\/03\/Car-key-fob-close-look-1024x680.jpg\" alt=\"Car key fob close look\" class=\"wp-image-67886\" width=\"1024\" height=\"680\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Car-key-fob-close-look-1024x680.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Car-key-fob-close-look-300x199.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Car-key-fob-close-look-768x510.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Car-key-fob-close-look-1536x1020.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Car-key-fob-close-look-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/Car-key-fob-close-look-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>If the immobilizer key is replaced, the new key&rsquo;s transponder signal must be programmed into the controllers.<\/figcaption><\/figure>\n\n\n\n<p>If the immobilizer key is replaced, the new key&rsquo;s transponder signal must be programmed into the controllers. Likewise, a new ECM\/PCM will need the old key fob&rsquo;s signal entered into its memory.<\/p>\n\n\n\n<p>The PCM regularly checks the fob signal from the immobilizer key and compares it with the signals programmed into the anti-theft control module. If the controller detects a transponder signal that it does not recognize, it will set the general code P0633.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of DTC P0633 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 P0633 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Bad anti-theft control module<\/li><li>Ignition key isn&rsquo;t programmed to the vehicle<\/li><li>Problem with the <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wiring\">wiring<\/a> like corrosion and shorted circuit<\/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 P0633 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Anti-theft light is switched on<\/li><li>Engine won&rsquo;t start<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0633 Code<\/h2>\n\n\n\n<p>The P0633 code is a generic diagnostic trouble code (DTC) and applies to many OBD-II vehicles built from 1996 or later. Despite being a generic code, the specific steps of the repair process can vary according to many factors.<\/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.<\/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=\"Honda Civic Key Fob Replacement\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/gUjOQ4jxsek?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 P0633 Code<\/h2>\n\n\n\n<p>Attempting to fix a P0633 code can become a frustrating task if you don&rsquo;t have the right tools and know-how to test the anti-theft module. In most cases, it&rsquo;s best to leave the job to professionals.<br>For DIYers with advanced technical knowledge and hands-on experience who prefer to test and replace their vehicle&rsquo;s anti-theft control module on their own, it will be helpful to rely on 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 refer to an online repair database\">repair manual or refer to an online repair database<\/a>.<\/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 immobilizer key is one of the security measures that protect your vehicle from thieves. It replaces the traditional metal&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0633-code-immobilizer-key-not-programmed-ecm-pcm\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":67887,"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":[3259,1323],"ppma_author":[2607,2855],"class_list":{"0":"post-67868","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-door-lock-cylinder","9":"tag-engine-control-module-2","10":"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>P0633 Code: Immobilizer Key not Programmed - ECM \/ PCM - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what a P0633 code means, its possible causes, and the common symptoms associated with this code.\" \/>\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\/p0633-code-immobilizer-key-not-programmed-ecm-pcm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0633 Code: Immobilizer Key not Programmed - ECM \/ PCM - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what a P0633 code means, its possible causes, and the common symptoms associated with this code.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0633-code-immobilizer-key-not-programmed-ecm-pcm\/\" \/>\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=\"2022-03-31T07:19:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-30T04:37:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/03\/car-key-with-car-in-background-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1365\" \/>\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=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0633-code-immobilizer-key-not-programmed-ecm-pcm\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0633-code-immobilizer-key-not-programmed-ecm-pcm\\\/\"},\"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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