{"id":77680,"date":"2025-08-31T15:03:45","date_gmt":"2025-08-31T20:03:45","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=77680"},"modified":"2025-08-31T15:11:07","modified_gmt":"2025-08-31T20:11:07","slug":"p0428-obd2-catalyst-temperature-sensor-circuit-high","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0428-obd2-catalyst-temperature-sensor-circuit-high","title":{"rendered":"P0428 OBD2: Catalyst Temperature Sensor Circuit High"},"content":{"rendered":"<p>The P0428 code indicates an issue with the catalyst temperature sensor circuit, specifically a high signal being detected. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various components of your vehicle&#8217;s emissions control system.<\/p>\n<h2>What Does the P0428 Code Mean?<\/h2>\n<p>The P0428 code signifies that the engine control module (PCM) has identified an incorrect signal from the catalytic converter temperature sensor. This sensor plays a critical role in ensuring that the catalytic converter operates efficiently and does not overheat.<\/p>\n<h2>What Causes the P0428 Code?<\/h2>\n<ul>\n<li>Catalytic converter temperature sensor failure<\/li>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Wiring issues related to the temperature sensor<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0428 Code?<\/h2>\n<p>Drivers may experience various symptoms when the P0428 code is triggered, including:<\/p>\n<ul>\n<li>Check Engine Light illuminated<\/li>\n<li>Poor engine performance<\/li>\n<li>Decreased fuel efficiency<\/li>\n<li>Potential overheating of the catalytic converter<\/li>\n<\/ul>\n<h2>How Serious Is the P0428 Code?<\/h2>\n<p>The P0428 code is considered to have moderate severity. While it may not pose an immediate threat to the vehicle&#8217;s safety or functionality, it should be diagnosed promptly to prevent further complications and maintain optimal vehicle performance.<\/p>\n<h2>How to Diagnose the P0428 Code<\/h2>\n<p>Diagnosing the P0428 code typically involves the following steps:<\/p>\n<ul>\n<li>Using an OBD-II scanner to confirm the presence of the P0428 code<\/li>\n<li>Inspecting the wiring and connectors associated with the catalytic converter temperature sensor<\/li>\n<li>Testing the temperature sensor for proper function<\/li>\n<li>Checking the PCM for any faults or issues<\/li>\n<\/ul>\n<h2>Common Repairs for the P0428 Code<\/h2>\n<p>Common repairs to address the P0428 code may include:<\/p>\n<ul>\n<li>Replacing a faulty catalytic converter temperature sensor<\/li>\n<li>Repairing or replacing damaged wiring or connectors<\/li>\n<li>Reprogramming or replacing the PCM, if necessary<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0428 Code?<\/h2>\n<p>The cost to repair the P0428 code can vary widely depending on the specific issue and the vehicle make and model. On average, repairs may range from $100 to $600, with sensor replacement being on the lower end and PCM replacement on the higher end.<\/p>\n<h2>Can I Fix the P0428 Code Myself?<\/h2>\n<p>While some aspects of diagnosing and repairing the P0428 code can be performed by a knowledgeable DIYer, it is recommended to seek professional assistance for accurate diagnosis and repair, especially when dealing with the PCM or complex wiring issues.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P0428 code indicates an issue with the catalyst temperature sensor circuit, specifically a high signal being detected. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various components of your vehicle&#8217;s emissions control system. What Does the P0428 Code Mean? The P0428 code signifies that the engine control module (PCM) &hellip;<\/p>\n","protected":false},"author":26,"featured_media":94604,"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-77680","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 v28.1 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P0428 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0428 code, what causes catalyst temperature sensor circuit high, and how to diagnose and fix common issues to maintain optimal engine 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\/p0428-obd2-catalyst-temperature-sensor-circuit-high\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0428 OBD2: Catalyst Temperature Sensor Circuit High\" \/>\n<meta property=\"og:description\" content=\"The P0428 code indicates an issue with the catalyst temperature sensor circuit, specifically a high signal being detected. This code is part of the\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0428-obd2-catalyst-temperature-sensor-circuit-high\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-31T20:03:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-31T20:11:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high.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\" 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He learned to write after spending over a decade doing it.","sameAs":["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\/p0428-obd2-catalyst-temperature-sensor-circuit-high.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/08\/p0428-obd2-catalyst-temperature-sensor-circuit-high-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 P0428 code indicates an issue with the catalyst temperature sensor circuit, specifically a high signal being detected. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various components of your vehicle&#8217;s emissions control system. What Does the P0428 Code Mean? The P0428 code signifies that the engine control module (PCM)&hellip;","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/77680","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=77680"}],"version-history":[{"count":3,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/77680\/revisions"}],"predecessor-version":[{"id":94621,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/77680\/revisions\/94621"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/94604"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=77680"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=77680"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=77680"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}