{"id":85058,"date":"2023-06-07T18:38:57","date_gmt":"2023-06-08T01:38:57","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=85058"},"modified":"2023-10-11T08:21:17","modified_gmt":"2023-10-11T15:21:17","slug":"p1778-code-step-motor-circuit-intermittent","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p1778-code-step-motor-circuit-intermittent\/","title":{"rendered":"P1778 Code: Step Motor Circuit Intermittent"},"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_0d9468-98 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_0d9468-98 > .kt-inside-inner-col,.kadence-column_0d9468-98 > .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_0d9468-98 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_0d9468-98 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_0d9468-98 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_0d9468-98 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_0d9468-98{position:relative;}@media all and (max-width: 1024px){.kadence-column_0d9468-98 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_0d9468-98 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_0d9468-98 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-9646f1  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-2b5ad0\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_b3d956-1a, .wp-block-kadence-advancedheading.kt-adv-heading_b3d956-1a[data-kb-block=\"kb-adv-heading_b3d956-1a\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_b3d956-1a mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_b3d956-1a[data-kb-block=\"kb-adv-heading_b3d956-1a\"] 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_b3d956-1a img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_b3d956-1a[data-kb-block=\"kb-adv-heading_b3d956-1a\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_b3d956-1a summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_b3d956-1a\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Issues with the step motor function or its circuit will alert the powertrain control module to register a P1778 code.<\/li><li>There are no other symptoms for a logged P1778 code other than an illuminated check engine light.<\/li><li>This code usually applies to vehicles with an OBD-II system and a continuously variable transmission (CVT).<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The stepper motor is a direct-current (DC) motor that moves from no voltage to full voltage. It can have as many as 180 steps of motion.<\/p>\n\n\n\n<p>If the PCM detects a problem with the transaxle stepper motor, on-board diagnostics will log a P1778 trouble code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P1778 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> P1778 stands for &ldquo;Step Motor Circuit Intermittent.&rdquo;<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/stepper-motor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"stepper motor\">stepper motor<\/a> serves as a reversible DC motor, moving a shaft back and forth to move a conical valve. Depending on the conical valve&rsquo;s direction, the engine can either increase or decrease its idle speed.<\/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\/2023\/07\/photo-showing-where-a-stepper-motor-is-located-1024x954.jpg\" alt=\"photo showing where a stepper motor is located\" class=\"wp-image-87478\" width=\"1024\" height=\"954\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/photo-showing-where-a-stepper-motor-is-located-1024x954.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/photo-showing-where-a-stepper-motor-is-located-300x279.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/photo-showing-where-a-stepper-motor-is-located-768x715.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/photo-showing-where-a-stepper-motor-is-located-1536x1430.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/photo-showing-where-a-stepper-motor-is-located-150x140.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/photo-showing-where-a-stepper-motor-is-located.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Photo showing where a stepper motor is located | Image Source: Richard McCuistian.<\/figcaption><\/figure>\n\n\n\n<p>A typical stepper motor has a permanent magnet and two electromagnets with the PCM controlling the latter. As the computer pulses the windings and changes their polarity, the stepper motor&rsquo;s armature rotates 90 degrees at a time.<\/p>\n\n\n\n<p>A DTC 1778 is triggered when the PCM detects a problem with the step motor function or its circuit.<\/p>\n\n\n\n<p>For more technical information about P1778, you can read our notes about the <a href=\"https:\/\/www.carparts.com\/blog\/p1778-code-step-motor-circuit-intermittent\/#More_About_the_Stepper_Motor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"stepper motor\">stepper motor<\/a>.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P1778 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<h3 class=\"wp-block-heading\">P1778 on Some Nissan Altima Vehicles<\/h3>\n\n\n\n<p>In some <a href=\"https:\/\/www.carparts.com\/nissan\/altima\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Nissan Altima\">Nissan Altima<\/a> vehicles, a P1778 code is detected when there is a great difference between the number of steps for the stepper motor and the actual gear ratio.<\/p>\n\n\n\n<p>This code is most likely to appear when the mechanical system is experiencing some issues, affecting the speed mechanism&rsquo;s operation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of the P1778 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Faulty stepper motor<\/li><li>Wiring issues<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P1778 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><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P1778 Code<\/h2>\n\n\n\n<p>DTC P1778 is a model-specific powertrain code that usually applies to vehicles with an OBD-II system and a continuously variable transmission (CVT).<\/p>\n\n\n\n<p>Diagnosing this trouble code might involve using a few tools and conducting a visual inspection of the affected part.<\/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>If you&rsquo;re not familiar with the diagnostic procedure yet, it&rsquo;s always a good idea to have a professional mechanic do the job for you. Otherwise, you can go ahead and do it yourself.<\/p>\n\n\n\n<p>To help you out, here are some videos you can watch to get an idea of what the process usually involves.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P1778 Code<\/h2>\n\n\n\n<p>Without the right tools and information, fixing a P1778 code can be frustrating and confusing. If done incorrectly, the repair might do more harm than good.<\/p>\n\n\n\n<p>If you&rsquo;re not confident in your DIY skills yet, you can always bring your vehicle to a trusted auto repair shop and have a mechanic take care of your daily driver.<\/p>\n\n\n\n<p>But if you think you can handle the job on your own, make sure to have the right equipment and repair manual before proceeding.<\/p>\n\n\n\n<p>Guides like those from Chilton or an ALLDATA subscription contain vehicle-specific repair information, so you might want to check those out before you begin.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">More About the Stepper Motor<\/h2>\n\n\n\n<p>One familiar application of a stepper motor is an <a href=\"https:\/\/www.carparts.com\/idle-control-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"idle air control (IAC) valve\">idle air control (IAC) valve<\/a> on the <a href=\"https:\/\/www.carparts.com\/throttle-body\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle body\">throttle body<\/a> that controls engine idle speeds and prevents the engine from stalling. 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) counts the number of steps the stepper motor does to determine its relative position.<\/p>\n\n\n\n<p>But code P1778 has nothing at all to do with idle speed control. The Nissan continuous variable transaxle (CVT) uses a stepper motor to move the active pulley for gear changes. A stepper motor can move its shaft in or out in a very controlled fashion rather than simply spinning the shaft to pull a load, enabling the TCM to provide gear ranges very similar to a conventional transaxle by moving the active pulley in steps.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>The Nissan continuous variable transaxle (CVT) uses a stepper motor to move the active pulley for gear changes.<\/p><cite><em>&ndash;<\/em><a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\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\/2023\/07\/pulleys-in-a-standard-CVT-and-how-they-resemble-a-go-cart-style-variable-speed-system-1024x529.jpg\" alt=\"pulleys in a standard CVT and how they resemble a go cart style variable speed system\" class=\"wp-image-87479\" width=\"1024\" height=\"529\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/pulleys-in-a-standard-CVT-and-how-they-resemble-a-go-cart-style-variable-speed-system-1024x529.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/pulleys-in-a-standard-CVT-and-how-they-resemble-a-go-cart-style-variable-speed-system-300x155.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/pulleys-in-a-standard-CVT-and-how-they-resemble-a-go-cart-style-variable-speed-system-768x397.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/pulleys-in-a-standard-CVT-and-how-they-resemble-a-go-cart-style-variable-speed-system-1536x794.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/pulleys-in-a-standard-CVT-and-how-they-resemble-a-go-cart-style-variable-speed-system-150x78.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/07\/pulleys-in-a-standard-CVT-and-how-they-resemble-a-go-cart-style-variable-speed-system.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>CVT transaxles typically use a steel push-belt consisting of hundreds of segments and multiple layers. However, the general illustration you see here provides a general understanding of the pulleys in a standard CVT and how they resemble a go-cart style variable speed system. The stepper motor moves one side of the active pulley and the other pulley responds against spring pressure. Notice how high gear and low gear are provided. | Image Source: Richard McCuistian.<\/figcaption><\/figure>\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 stepper motor is a direct-current (DC) motor that moves from no voltage to full voltage. It can have as&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p1778-code-step-motor-circuit-intermittent\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":85063,"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":[1323,1703,3805],"ppma_author":[2607,2985],"class_list":{"0":"post-85058","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-engine-control-module-2","9":"tag-idle-control-valve","10":"tag-stepper-motor","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>P1778 Code: Step Motor Circuit Intermittent - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what does code P1778 mean and what could happen to your vehicle once it logs this code in this article.\" \/>\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\/p1778-code-step-motor-circuit-intermittent\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P1778 Code: Step Motor Circuit Intermittent - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what does code P1778 mean and what could happen to your vehicle once it logs this code in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p1778-code-step-motor-circuit-intermittent\/\" \/>\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=\"2023-06-08T01:38:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-11T15:21:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/mechanic-resolving-p1778-code-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1363\" \/>\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\\\/p1778-code-step-motor-circuit-intermittent\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p1778-code-step-motor-circuit-intermittent\\\/\"},\"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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