{"id":78492,"date":"2025-08-08T10:10:10","date_gmt":"2025-08-08T15:10:10","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=78492"},"modified":"2025-08-08T10:10:10","modified_gmt":"2025-08-08T15:10:10","slug":"p0978-obd2-shift-solenoid-c-control-circuit-range-performance","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0978-obd2-shift-solenoid-c-control-circuit-range-performance","title":{"rendered":"P0978 OBD2: Shift Solenoid &#8220;C&#8221; Control Circuit Range\/Performance"},"content":{"rendered":"<p>The P0978 OBD-II code indicates a problem with the Shift Solenoid &#8220;C&#8221; control circuit, which is crucial for the proper functioning of your vehicle&#8217;s transmission.<\/p>\n<h2>What Does the P0978 Code Mean?<\/h2>\n<p>The P0978 code is triggered when the Transmission Control Module (TCM) detects that the Shift Solenoid &#8220;C&#8221; is not performing within its expected range or performance level. This can lead to issues with the vehicle&#8217;s transmission, causing it to not shift properly.<\/p>\n<h2>What Causes the P0978 Code?<\/h2>\n<p>Several factors can contribute to the P0978 code, including:<\/p>\n<ul>\n<li>Transmission Control Module (TCM) failure<\/li>\n<li>Low transmission fluid level<\/li>\n<li>Failure of the transmission shift solenoid<\/li>\n<li>Wiring issues affecting the circuit<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0978 Code?<\/h2>\n<p>Common symptoms associated with the P0978 code include:<\/p>\n<ul>\n<li>Increased fuel consumption<\/li>\n<li>Transmission may not shift properly<\/li>\n<\/ul>\n<h2>How Serious Is the P0978 Code?<\/h2>\n<p>The P0978 code is categorized as urgent. It indicates that immediate action is necessary, as ignoring this code can lead to severe damage to the vehicle&#8217;s transmission and potentially harm the driver and passengers.<\/p>\n<h2>How to Diagnose the P0978 Code<\/h2>\n<p>Diagnosing the P0978 code involves a comprehensive approach:<\/p>\n<ul>\n<li>Use an OBD-II scanner to confirm the P0978 code and check for any additional codes.<\/li>\n<li>Inspect transmission fluid levels and quality.<\/li>\n<li>Examine the wiring and connectors related to the shift solenoid.<\/li>\n<li>Test the TCM and shift solenoid for proper operation.<\/li>\n<\/ul>\n<h2>Common Repairs for the P0978 Code<\/h2>\n<p>Common repairs to resolve the P0978 code may include:<\/p>\n<ul>\n<li>Replacing the transmission shift solenoid<\/li>\n<li>Repairing or replacing damaged wiring and connectors<\/li>\n<li>Refilling or replacing low or contaminated transmission fluid<\/li>\n<li>Replacing a faulty Transmission Control Module (TCM)<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0978 Code?<\/h2>\n<p>The cost to fix the P0978 code can vary based on the specific repairs needed. On average, repairs can range from $100 to $1,000, depending on whether you need to replace a solenoid, repair wiring, or replace the TCM.<\/p>\n<h2>Can I Fix the P0978 Code Myself?<\/h2>\n<p>While some DIY enthusiasts may be able to perform basic checks such as inspecting fluid levels and wiring, diagnosing and repairing transmission-related issues often require specialized knowledge and tools. It&#8217;s recommended to consult with a professional mechanic to ensure proper diagnosis and repair, especially for urgent issues like the P0978 code.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P0978 OBD-II code indicates a problem with the Shift Solenoid &#8220;C&#8221; control circuit, which is crucial for the proper functioning of your vehicle&#8217;s transmission. What Does the P0978 Code Mean? The P0978 code is triggered when the Transmission Control Module (TCM) detects that the Shift Solenoid &#8220;C&#8221; is not performing within its expected range &hellip;<\/p>\n","protected":false},"author":26,"featured_media":92420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[11987],"tags":[],"class_list":["post-78492","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-p-obd2-codes-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P0978 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0978 code, what causes shift solenoid &quot;C&quot; control circuit range\/performance issues, and how to diagnose and fix common problems to maintain optimal transmission performance.\" \/>\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.emanualonline.com\/blog\/p0978-obd2-shift-solenoid-c-control-circuit-range-performance\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0978 OBD2: Shift Solenoid &quot;C&quot; Control Circuit Range\/Performance\" \/>\n<meta property=\"og:description\" content=\"The P0978 OBD-II code indicates a problem with the Shift Solenoid &quot;C&quot; control circuit, which is crucial for the proper functioning of your vehicle&#039;s\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0978-obd2-shift-solenoid-c-control-circuit-range-performance\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/jee514\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-08T15:10:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"JC Landry\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:site\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"JC Landry\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0978-obd2-shift-solenoid-c-control-circuit-range-performance#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p0978-obd2-shift-solenoid-c-control-circuit-range-performance\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P0978 OBD2: Shift Solenoid &#8220;C&#8221; 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He also loves cats, Johnny Cash and Subarus.","sameAs":["https:\/\/www.facebook.com\/jee514","https:\/\/www.instagram.com\/rat_in_chief\/","https:\/\/www.linkedin.com\/in\/jean-claude-landry-857781186\/"],"url":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"}]}},"uagb_featured_image_src":{"full":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0978-obd2-shift-solenoid-c-control-circuit-rangeperformance-1050x525.png",1050,525,true]},"uagb_author_info":{"display_name":"JC Landry","author_link":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"},"uagb_comment_info":0,"uagb_excerpt":"The P0978 OBD-II code indicates a problem with the Shift Solenoid &#8220;C&#8221; control circuit, which is crucial for the proper functioning of your vehicle&#8217;s transmission. What Does the P0978 Code Mean? The P0978 code is triggered when the Transmission Control Module (TCM) detects that the Shift Solenoid &#8220;C&#8221; is not performing within its expected range&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78492","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/comments?post=78492"}],"version-history":[{"count":1,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78492\/revisions"}],"predecessor-version":[{"id":85191,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/78492\/revisions\/85191"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/92420"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=78492"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=78492"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=78492"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}