{"id":17759,"date":"2022-07-15T02:24:00","date_gmt":"2022-07-15T09:24:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=17759"},"modified":"2024-06-08T09:01:21","modified_gmt":"2024-06-08T16:01:21","slug":"p0078-code-exhaust-valve-control-solenoid-circuit-b1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0078-code-exhaust-valve-control-solenoid-circuit-b1\/","title":{"rendered":"P0078 Code: Exhaust Valve Control Solenoid Circuit B1"},"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_906ae3-21 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_906ae3-21 > .kt-inside-inner-col,.kadence-column_906ae3-21 > .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_906ae3-21 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_906ae3-21 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_906ae3-21 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_906ae3-21 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_906ae3-21{position:relative;}@media all and (max-width: 1024px){.kadence-column_906ae3-21 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_906ae3-21 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_906ae3-21 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-e39908  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-f0b3af\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_0d1128-13, .wp-block-kadence-advancedheading.kt-adv-heading_0d1128-13[data-kb-block=\"kb-adv-heading_0d1128-13\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_0d1128-13 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_0d1128-13[data-kb-block=\"kb-adv-heading_0d1128-13\"] 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_0d1128-13 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_0d1128-13[data-kb-block=\"kb-adv-heading_0d1128-13\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_0d1128-13 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_0d1128-13\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Diagnostic trouble code (DTC) P0078 stands for &ldquo;Exhaust Valve Control Solenoid Circuit Bank 1.&rdquo;<\/li><li>A bad VVTsolenoid and an outdated PCM software can trigger the P0078 code. In some cases, it can also be logged because of circuit issues.<\/li><li>The common symptoms associated with this code include poor engine performance and reduced fuel economy.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>P0078 is an engine trouble code related to a possible issue in the exhaust valve control solenoid circuit. Since these solenoids are crucial to the operation of your vehicle, any underlying issue must be addressed right away. Read on to learn more about this trouble code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0078 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) P0078 stands for &ldquo;Exhaust Valve Control Solenoid Circuit Bank 1.&rdquo; It is triggered once the powertrain control module (PCM) detects a possible issue in the exhaust valve control solenoid circuit located in Bank 1.<\/p>\n\n\n\n<p>Bank 1 is the side of the engine where cylinder #1 is located. Specifically, it is triggered once the PCM perceives a voltage signal that&rsquo;s either intermittent or out of the specified 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\/10\/obd-code-0078-1024x681.jpeg\" alt=\"obd code 0078\" class=\"wp-image-17774\" width=\"1024\" height=\"681\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/obd-code-0078-1024x681.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/obd-code-0078-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/obd-code-0078-768x511.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/obd-code-0078-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/obd-code-0078-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/obd-code-0078.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Code P0078 indicates that your PCM perceives a voltage signal that&rsquo;s either intermittent or out of the specified range.<\/figcaption><\/figure>\n\n\n\n<p>In modern vehicles, the PCM regulates the open and close movement of the intake and\/or <a href=\"https:\/\/www.carparts.com\/exhaust-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust valves\">exhaust valves<\/a> through the variable valve timing (VVT) system. It does this task with the help of actuator(s) that are mounted at the end of the <a href=\"https:\/\/www.carparts.com\/camshaft\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"camshaft(s)\">camshaft(s)<\/a>.<\/p>\n\n\n\n<p>To successfully adjust the camshaft position, the PCM regulates engine oil to each actuator using a control solenoid. This solenoid is regulated by the PCM with the help of a pulse width modulated (PWM) signal.<\/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>Once your PCM detects that the voltage signal from the exhaust valve control solenoid circuit is either intermittent or out of the specified range, it will trigger the P0078 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the Solenoid Do?<\/h2>\n\n\n\n<p>The ECM\/PCM sends a &ldquo;pulse width&rdquo; signal to a simple two-wire oil control solenoid that delivers oil to an adjustable cam phaser which is spring loaded to its default position.<\/p>\n\n\n\n<p>As oil pressure is applied, the relationship between the cam gear and the camshaft&ndash;the angle, as it were&ndash;changes so that the valves are operating with a different timing than default.<\/p>\n\n\n\n<p>This was done on <a href=\"https:\/\/www.carparts.com\/vehicle\/1995\/Ford\/Contour\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"1995 Ford Contours\">1995 Ford Contours<\/a> only on the exhaust camshaft to close the valves early, leaving some exhaust gas in the combustion chamber rather than recirculating it through an <a href=\"https:\/\/www.carparts.com\/blog\/what-does-an-egr-valve-do\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"EGR valve\">EGR valve<\/a>, but the Contour used helical gears moving in a linear fashion to alter cam timing. However, an oil control solenoid was still the activating component.<\/p>\n\n\n\n<p>Using a pulse width duty cycle means the ECM\/PCM turns the solenoid on and off really fast to regulate the pressure it uses to adjust the cam timing on the fly. Some engines have both intake and exhaust camshafts operating this way. Read our technical discussion about <a href=\"https:\/\/www.carparts.com\/blog\/p0012-code-intake-a-camshaft-position-timing-over-retarded-bank-1\/#An_In-Depth_Look_at_Camshaft_Angle_and_VVT\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"camshaft angle and VVT\">camshaft angle and VVT<\/a> for more information that can help you resolve P0078.<\/p>\n\n\n\n<p><em><strong>Note: <\/strong>The definition of code P0078 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<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid-1024x1024.jpeg\" alt=\"variable timing solenoid\" class=\"wp-image-17782\" width=\"1024\" height=\"1024\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid-1024x1024.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid-300x300.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid-768x768.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid-75x75.jpeg 75w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid-600x600.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid-928x928.jpeg 928w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid-150x150.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/variable-timing-solenoid.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A faulty VVT solenoid can cause P0078 code.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0078 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Circuit issues (e.g., corroded terminals, poor connection)<\/li><li>Malfunctioning VVT solenoid<\/li><li>Malfunctioning PCM or software in need of an update<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0078 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=\"Check engine light is on\">Check engine light is on<\/a><\/li><li>Poor engine performance<\/li><li>Decreased fuel economy<\/li><\/ul>\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\/10\/low-fuel-level-1024x683.jpeg\" alt=\"low fuel level\" class=\"wp-image-17783\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/low-fuel-level-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/low-fuel-level-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/low-fuel-level-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/low-fuel-level-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/low-fuel-level-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/low-fuel-level.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Decreased fuel economy may indicate code P0078.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0078 Code <\/h2>\n\n\n\n<p>Diagnosing a P0078 code isn&rsquo;t an easy task. If you don&rsquo;t have the proper tools and the automotive repair experience, it&rsquo;s best to take your vehicle to the nearest repair shop for proper diagnosis and repair.<\/p>\n\n\n\n<p>However, if you&rsquo;re an experienced DIYer and you&rsquo;re up for the challenge, we recommend consulting vehicle-specific repair manuals. These guides will help you identify the exact repair procedures that may work for your vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0078 Code <\/h2>\n\n\n\n<p>There is no universal solution for trouble codes, including code P0078. Vehicles are made and programmed differently, so their repair and diagnostic procedures may vary. For instance, the repair procedures for a P0078 on a <a href=\"https:\/\/www.carparts.com\/nissan\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Nissan\">Nissan<\/a> may not work for a P0078 on a <a href=\"https:\/\/www.carparts.com\/ford\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Ford\">Ford<\/a>.<\/p>\n\n\n\n<p>If you are determined to fix the issue yourself, you can consult vehicle-specific repair manuals or <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"subscribe to an online database\">subscribe to an online database<\/a>. Doing so will help you identify the exact fix that may work for your vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Find a Replacement VVT Solenoid to Resolve DTC P0078<\/h2>\n\n\n\n<p>As mentioned previously, a malfunctioning <a href=\"https:\/\/www.carparts.com\/variable-timing-solenoid\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"VVT solenoid\">VVT solenoid<\/a> has the potential to cause a lot of problems, including DTC P0078. If you have a solenoid that isn&rsquo;t functioning properly, it&rsquo;s not a good idea to drive your vehicle until it&rsquo;s replaced. Thankfully, getting a replacement is easy with <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 offer solenoids that passed the highest quality control standards. They&rsquo;re also carefully handpicked by our team of professionals to ensure they&rsquo;re built to last. On top of that, all our products come with a low-price guarantee to help you get the best value for your money.<\/p>\n\n\n\n<p>Our website makes it easy for car owners like you to find the right parts for your ride. After entering your car&rsquo;s specifications into our vehicle selector, use the search filters to view the solenoids that match your preferred brand, price, and feature.<\/p>\n\n\n\n<p>Browse our collection of high-quality solenoids now!<\/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\/exhaust-valve\" target=\"_blank\" aria-label=\"exhaust valve\" rel=\"noopener\">\n        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_210,w_210,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/dnjev101_1\" alt=\"exhaust valve\">\n\t<strong>Exhaust Valve<\/strong>\n    <\/a>\n\n   <a href=\"https:\/\/www.carparts.com\/variable-timing-solenoid\" target=\"_blank\" aria-label=\"variable timing solenoid\" rel=\"noopener\">\n        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_210,w_210,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repn380802_1\" alt=\"variable timing solenoid\">\n\t<strong>Variable Timing Solenoid<\/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>P0078 is an engine trouble code related to a possible issue in the exhaust valve control solenoid circuit. Since these&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0078-code-exhaust-valve-control-solenoid-circuit-b1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":17770,"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":[1184,1695],"ppma_author":[2607,2985],"class_list":{"0":"post-17759","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-exhaust-valve-2","9":"tag-variable-timing-solenoid","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0078 Code: Exhaust Valve Control Solenoid Circuit B1 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn more about code P0078, what causes it, the common symptoms related to it, and some tips on how to diagnose and fix it.\" \/>\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\/p0078-code-exhaust-valve-control-solenoid-circuit-b1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0078 Code: Exhaust Valve Control Solenoid Circuit B1 - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn more about code P0078, what causes it, the common symptoms related to it, and some tips on how to diagnose and fix it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0078-code-exhaust-valve-control-solenoid-circuit-b1\/\" \/>\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=\"2022-07-15T09:24:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-08T16:01:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/P0078-Code.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1001\" \/>\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\\\/p0078-code-exhaust-valve-control-solenoid-circuit-b1\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0078-code-exhaust-valve-control-solenoid-circuit-b1\\\/\"},\"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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