{"id":18471,"date":"2022-03-16T00:47:00","date_gmt":"2022-03-16T07:47:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=18471"},"modified":"2024-06-08T09:01:51","modified_gmt":"2024-06-08T16:01:51","slug":"p0115-code-engine-coolant-temperature-sensor-1-circuit","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0115-code-engine-coolant-temperature-sensor-1-circuit\/","title":{"rendered":"P0115 Code: Engine Coolant Temperature Sensor 1 Circuit"},"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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_ae2489-c8 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_ae2489-c8 > .kt-inside-inner-col,.kadence-column_ae2489-c8 > .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_ae2489-c8 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_ae2489-c8 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_ae2489-c8 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_ae2489-c8 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_ae2489-c8{position:relative;}@media all and (max-width: 1024px){.kadence-column_ae2489-c8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_ae2489-c8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_ae2489-c8 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-3b8b32  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-fce25d\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_8bf16a-a1, .wp-block-kadence-advancedheading.kt-adv-heading_8bf16a-a1[data-kb-block=\"kb-adv-heading_8bf16a-a1\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_8bf16a-a1 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_8bf16a-a1[data-kb-block=\"kb-adv-heading_8bf16a-a1\"] 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_8bf16a-a1 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_8bf16a-a1[data-kb-block=\"kb-adv-heading_8bf16a-a1\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_8bf16a-a1 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_8bf16a-a1\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The P0115 code is logged once the PCM detects an erratic or irrational input signal coming from the engine coolant temperature (ECT) sensor circuit.<\/li><li>It can also be logged if the PCM senses an unusually high or low voltage from the ECT sensor circuit.<\/li><li>Some common causes of a P0115 code are a bad ECT sensor, an open ECT sensor return circuit, and a damaged ECT sensor connector.<\/li><li>Some common symptoms associated with this code are hard starting, poor fuel economy, and engine overheating. However, there are many cases where there are no noticeable symptoms.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>A vehicle&rsquo;s engine accumulates heat as it operates. Engine coolant is circulated within the engine to absorb heat. With the help of the radiator and the rest of the engine cooling system, that heat is dispersed into the atmosphere. The <a href=\"https:\/\/www.carparts.com\/radiator\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"radiator\">radiator<\/a> is referred to by engineers as a &ldquo;heat exchanger.&rdquo; The cooling system maintains the engine&rsquo;s optimal operating temperature by keeping it at optimum temperature &ndash; the engine doesn&rsquo;t need to be too hot, for obvious reasons, but it doesn&rsquo;t need to run too cold either. As peculiar as it may seem, running too hot OR too cold will both cause engine damage. Running too cold causes sludge buildup within the engine, which can eventually starve the engine of oil, effectively destroying it. Running too hot can kill an engine very quickly.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>As peculiar as it may seem, running too hot or too cold will both cause engine damage.<\/p><cite><em>&ndash;&nbsp;<\/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<p>The P0115 code indicates that there is a potential issue with the sensor that monitors the engine coolant temperature. Find out more about this trouble code with this informative guide.<\/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\/image-of-a-coolant-temperature-sensor-1-1024x645.jpeg\" alt=\"image of a coolant temperature sensor\" class=\"wp-image-67681\" width=\"1024\" height=\"645\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/image-of-a-coolant-temperature-sensor-1-1024x645.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/image-of-a-coolant-temperature-sensor-1-300x189.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/image-of-a-coolant-temperature-sensor-1-768x484.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/image-of-a-coolant-temperature-sensor-1-150x95.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/image-of-a-coolant-temperature-sensor-1.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Code P0015 may be set when the PCM detects erratic or irrational input signals coming from the ECT sensor circuit.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0115 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0115 stands for &ldquo;Engine Coolant Temperature Sensor Circuit.&rdquo; This code sets when the powertrain control module (PCM) detects erratic or irrational input signals coming from the engine coolant temperature (ECT) sensor circuit. The code may also register if the PCM detects an abnormally low or high voltage signal from the engine coolant temperature sensor circuit. The &lsquo;1&rsquo; portion of the code points to sensor # 1 in vehicles with two coolant temperature sensors.<\/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>The engine coolant temperature sensor measures the temperature of the engine coolant. This two-wire sensor is a thermistor that changes resistance with temperature. One wire carries the 5V reference signal from the PCM and the other is the ground wire.<\/p>\n\n\n\n<p>As the temperature of the engine coolant changes, the sensor&rsquo;s resistance changes on its ground signal to the PCM. If the engine is cold, the sensor&rsquo;s resistance is high, but if the engine is warm, the resistance is low.<\/p>\n\n\n\n<p>The PCM uses the data from the engine coolant temperature sensor to control the air-fuel ratio, ignition spark timing, cooling fan operation, and other components of the emissions control system.<\/p>\n\n\n\n<p>If you&rsquo;re planning to troubleshoot P0115 yourself, you can find more useful information in our technical discussion about <a href=\"https:\/\/www.carparts.com\/blog\/p0117-code-engine-coolant-temperature-sensor-1-circuit-low\/#How_the_Engine_Coolant_Temperature_Sensor_Can_Trigger_OBD_Codes\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"how the engine coolant temperature sensor can trigger OBD codes\">how the engine coolant temperature sensor can trigger OBD codes<\/a>.<\/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\/car-engine-overheat-1024x683.jpeg\" alt=\"car engine overheating\" class=\"wp-image-18477\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/car-engine-overheat-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/car-engine-overheat-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/car-engine-overheat-768x513.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/car-engine-overheat-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/car-engine-overheat-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/car-engine-overheat.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>An overheating engine is a possible cause of code P0115.<\/figcaption><\/figure>\n\n\n\n<p><em><strong>Note: <\/strong>The definition of code P0115 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<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0115 Code?<\/h2>\n\n\n\n<p>DTCs, such as the P0115 code, have a number of possible causes. This is mainly due to the fact that DTCs themselves can only point to the nature and location of the potential issue and not the main cause itself. Listed below are some of the possible reasons why the P0115 code sets:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/engine-coolant-temperature-sensor-purpose-location-and-failure-signs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Faulty ECT sensor\">Faulty ECT sensor<\/a><\/li><li>ECT sensor return circuit is open<\/li><li>ECT sensor connector is damaged (check pins for damage and\/or moisture)<\/li><li>ECT sensor signal circuit is open or shorted to voltage<\/li><li>PCM has failed<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/car-overheats-when-the-ac-is-on-causes-and-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Engine overheating\">Engine overheating<\/a><\/li><li>Low coolant level<\/li><li>Air in the cooling system<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0115 Code?<\/h2>\n\n\n\n<p>When there is a potential issue with sensors or sensor circuits, the vehicle&rsquo;s computer system stores information about the issue as a <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>. The computer may also send a signal to turn the malfunction indicator lamp (MIL) on. In some cases, an activated MIL is the only indicator that there is a problem.<\/p>\n\n\n\n<p>However, you may observe other signs if you encounter other DTCs. If you&rsquo;re dealing with the P0115 code, you may notice the following symptoms:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Malfunction indicator lamp (MIL) or <a href=\"\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light illuminated\">check engine light illuminated<\/a><\/li><li>Engine may be hard starting<\/li><li>Poor fuel economy<\/li><li>Engine running extremely rich or lean<\/li><li>Engine dying <\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/what-damage-to-expect-from-an-overheating-car\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Engine overheating\">Engine overheating<\/a><\/li><li>In many cases, no unusual symptoms may be noticed<\/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\/engine-hard-starting-1024x683.jpeg\" alt=\"engine hard starting\" class=\"wp-image-18478\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/engine-hard-starting-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/engine-hard-starting-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/engine-hard-starting-768x513.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/engine-hard-starting-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/engine-hard-starting-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/10\/engine-hard-starting.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A hard starting engine might indicate that your car computer has logged code P0115.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0115 Code<\/h2>\n\n\n\n<p>In order to fix DTCs, such as the P0115 code, you&rsquo;ll need to conduct a thorough diagnosis. Diagnostic trouble codes can only point you to the nature and the location of the potential problem, not the issue itself. For you to formulate an effective and long-term solution, you&rsquo;ll have to determine the exact root cause.<\/p>\n\n\n\n<p>There are a lot of sources to help you troubleshoot DTCs. Vehicle-specific <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manuals and databases\">repair manuals and databases<\/a> are the best sources because they have detailed repair instructions as well as helpful diagrams and illustrations. Online materials such as how-to videos, blogs, and <a href=\"https:\/\/www.carparts.com\/blog\/best-online-resources-to-help-you-learn-how-to-fix-cars\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"online training tools\">online training tools<\/a> are also quite helpful.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0115 Code<\/h2>\n\n\n\n<p>Fixing DTCs takes time and effort. First, you have to determine what triggered the code in the first place. Doing this requires you to narrow down the list of possible causes until you reach the main issue.<\/p>\n\n\n\n<p>Second, you have to note that vehicles are built differently so terminology, DTC setting conditions, and repair instructions will differ depending on the make. For example, the P0115 on <a href=\"https:\/\/www.carparts.com\/coolant-temperature-sensor\/nissan\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Nissan\">Nissan<\/a> vehicles puts the engine in a fail-safe mode while the P0115 ion <a href=\"https:\/\/www.carparts.com\/coolant-temperature-sensor\/toyota\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Toyota\">Toyota<\/a> vehicles doesn&rsquo;t.<\/p>\n\n\n\n<p>Repair manuals can definitely help the seasoned DIYer to fix the issue. However, if you&rsquo;re not confident in your DTC repair skills, it&rsquo;s best to leave the job to a certified mechanic and\/or technician.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a New Engine Coolant Temperature Sensor for Your Vehicle<\/h2>\n\n\n\n<p>A malfunctioning <a href=\"https:\/\/www.carparts.com\/coolant-temperature-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine coolant temperature sensor\">engine coolant temperature sensor<\/a> can trigger an OBD code and cause various engine issues that are hard and costly to fix. It usually starts with the engine overheating, so don&rsquo;t think twice about replacing it.<\/p>\n\n\n\n<p>Thankfully, it&rsquo;s easy to find a replacement engine coolant temperature sensor with the help of <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>. Use our vehicle selector and filters to view top-notch engine coolant temperature sensors that fit your ride and needs.<\/p>\n\n\n\n<p>If you want to fix your ride as soon as possible, know that we have warehouses strategically located across the country. That means you won&rsquo;t have to wait weeks for your order.<\/p>\n\n\n\n<p>Your ECT sensor is a crucial engine component, and we make sure that we&rsquo;re giving you the best possible replacements for your ride. That&rsquo;s why we source our parts from top aftermarket brands in the country. They&rsquo;re rigorously tested during manufacturing, so you can be sure they&rsquo;ll last a long time.<\/p>\n\n\n\n<p>Don&rsquo;t wait for your car to break down before you have your ECT sensor replaced. Order what you need today!<\/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  \n\n    <!-- start of editable content --> \n\n    <a href=\"https:\/\/www.carparts.com\/radiator\" target=\"_blank\" aria-label=\"radiator\" rel=\"noopener\"> \n\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\/p2822_1\" alt=\"radiator\"> \n\n<strong>Radiator<\/strong> \n\n    <\/a>   \n\n    <a href=\"https:\/\/www.carparts.com\/coolant-temperature-sensor\" target=\"_blank\" aria-label=\"coolant temperature sensor\" rel=\"noopener\"> \n\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\/repf312802_1\" alt=\"coolant temperature sensor\"> \n\n<strong>Coolant Temperature Sensor<\/strong> \n\n    <\/a>  \n\n \n\n     <!-- end of editable content --> \n\n  \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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>A vehicle&rsquo;s engine accumulates heat as it operates. Engine coolant is circulated within the engine to absorb heat. With the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0115-code-engine-coolant-temperature-sensor-1-circuit\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":18475,"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":[1252],"ppma_author":[2607,2985],"class_list":{"0":"post-18471","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-coolant-temperature-sensor","9":"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>P0115 Code: Engine Coolant Temperature Sensor 1 Circuit - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"What does the P0115 trouble code mean and how should you address its root cause? Answer these questions and more with this brief guide.\" \/>\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\/p0115-code-engine-coolant-temperature-sensor-1-circuit\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0115 Code: Engine Coolant Temperature Sensor 1 Circuit - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"What does the P0115 trouble code mean and how should you address its root cause? 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