{"id":16144,"date":"2021-07-23T03:36:00","date_gmt":"2021-07-23T10:36:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=16144"},"modified":"2026-02-10T19:03:03","modified_gmt":"2026-02-11T03:03:03","slug":"p0117-code-engine-coolant-temperature-sensor-1-circuit-low","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0117-code-engine-coolant-temperature-sensor-1-circuit-low\/","title":{"rendered":"P0117 Code: Engine Coolant Temperature Sensor 1 Circuit Low"},"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\"> 7<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column16144_19c06f-b3 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16144_19c06f-b3 > .kt-inside-inner-col,.kadence-column16144_19c06f-b3 > .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-column16144_19c06f-b3 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16144_19c06f-b3 > .kt-inside-inner-col{flex-direction:column;}.kadence-column16144_19c06f-b3 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16144_19c06f-b3 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16144_19c06f-b3{position:relative;}@media all and (max-width: 1024px){.kadence-column16144_19c06f-b3 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16144_19c06f-b3 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16144_19c06f-b3 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-e2cdbc  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-b66b9c\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading16144_d72824-26, .wp-block-kadence-advancedheading.kt-adv-heading16144_d72824-26[data-kb-block=\"kb-adv-heading16144_d72824-26\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading16144_d72824-26 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading16144_d72824-26[data-kb-block=\"kb-adv-heading16144_d72824-26\"] 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-heading16144_d72824-26 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading16144_d72824-26[data-kb-block=\"kb-adv-heading16144_d72824-26\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading16144_d72824-26 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading16144_d72824-26\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The P0117 code stands for &ldquo;Engine Coolant Temperature (ECT) Sensor 1 Circuit Low&rdquo;, which means your powertrain control module has detected a low voltage input from ETC sensor 1.<\/li>\n\n\n\n<li>A defective ETC sensor, air pockets in the coolant system, and other cooling system issues are some of the common causes of the P0117 code.<\/li>\n\n\n\n<li>The common symptoms of the P0117 code include an activated check engine light, poor fuel economy, and an overheating engine.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Proper engine temperature must be maintained for the engine to function well. If the engine runs cold, it can consume excessive amounts of fuel, affecting the overall performance of the vehicle. If the engine runs too hot, it can permanently damage your engine and its surrounding components.<\/p>\n\n\n\n<p>The engine cooling system maintains the optimal operating temperature of an engine. The engine coolant absorbs heat from the engine, while the sensors monitor its temperature. The P0117 code indicates a problem with one of the engine coolant temperature sensors in your vehicle. Find out more about this error code and what to do in case you encounter it using this short guide.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0117 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0117 stands for &ldquo;Engine Coolant Temperature Sensor 1 Circuit Low.&rdquo; It indicates that the vehicle&rsquo;s powertrain control module or PCM has detected a low voltage input from the engine coolant temperature (ECT) sensor 1.<\/p>\n\n\n\n<p>The ECT sensor monitors changes in the temperature of your engine&rsquo;s coolant. The information it obtains is sent to the PCM, which uses the data to regulate the air-to-fuel ratio, cooling fan operation, ignition spark timing, and other powertrain-related outputs.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/asian-mechanic-checking-under-the-car-hood-1024x682.jpg\" alt=\"asian mechanic checking under the car hood\" class=\"wp-image-42117\" style=\"width:1024px;height:682px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/asian-mechanic-checking-under-the-car-hood-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/asian-mechanic-checking-under-the-car-hood-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/asian-mechanic-checking-under-the-car-hood-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/asian-mechanic-checking-under-the-car-hood-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/asian-mechanic-checking-under-the-car-hood-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/asian-mechanic-checking-under-the-car-hood-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/asian-mechanic-checking-under-the-car-hood.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">P0117 code indicates that the vehicle&rsquo;s powertrain control module or PCM has detected a low voltage input from the engine coolant temperature (ECT) sensor 1.<\/figcaption><\/figure>\n\n\n\n<p>Once the PCM detects a signal voltage that&rsquo;s lower than the normal operating range of the sensor, the OBD code P0117 registers in your vehicle&rsquo;s memory. The low signal that the PCM detects from the ECT sensor can mean that the engine coolant is excessively hot.<\/p>\n\n\n\n<p>For a technical understanding of how the engine coolant temperature sensor can trigger OBD codes like P0117, read our in-depth explanation <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=\"here\">here<\/a>.<\/p>\n\n\n\n<p>Read on to learn the possible causes of P0117, as well as symptoms.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0117 Code?<\/h2>\n\n\n\n<p>There are a lot of issues that could trigger the engine code P0117. Below are just some of the possible causes of P0117:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Defective <a href=\"https:\/\/www.carparts.com\/blog\/engine-coolant-temperature-sensor-purpose-location-and-failure-signs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine coolant temp sensor\">engine coolant temp sensor<\/a><\/li>\n\n\n\n<li>Cooling system problems leading to <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>\n\n\n\n<li>Damaged or corroded engine coolant temp wiring or connection<\/li>\n\n\n\n<li>Air pocket in the coolant system<\/li>\n\n\n\n<li>PCM issues<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-coolant-temperature-sensor-1024x683.jpeg\" alt=\"engine coolant temperature sensor\" class=\"wp-image-16149\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-coolant-temperature-sensor-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-coolant-temperature-sensor-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-coolant-temperature-sensor-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-coolant-temperature-sensor-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-coolant-temperature-sensor-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/engine-coolant-temperature-sensor.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">A defective engine coolant temp sensor can cause the P0117 code.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0117 Code?<\/h2>\n\n\n\n<p>Should you encounter the P0117 code, there are a few signs you have to look out for. This code points to issues with the ECT sensor and high engine coolant temperature. Below is a list of the most common symptoms of this trouble code:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Activated check engine light\">Activated check engine light<\/a><\/li>\n\n\n\n<li>In some cases, the engine may be hard starting and or get poor fuel economy<\/li>\n\n\n\n<li>Engine may run rough<\/li>\n\n\n\n<li>May not idle<\/li>\n\n\n\n<li>May start and then die<\/li>\n\n\n\n<li>Engine overheating&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0117 Code<\/h2>\n\n\n\n<p><strong><em>WARNING: To avoid serious burns, never remove the coolant fill cap on a hot engine under any circumstances.<\/em><\/strong><\/p>\n\n\n\n<p>Like other OBD-II codes, the P0117 code has multiple possible causes. It&rsquo;s important to pinpoint the exact reason behind the issue to determine a proper fix. Here are some video resources that can help you reach an accurate diagnosis:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Acura TL Engine Coolant Temperature Sensor P0117 \/ P0118\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/6Osk_aguZ3U?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Engine Coolant Temperature Sensor P0117 \/ P0118 | How to Test and Replace\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/vhputa79rLQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0117 Code<\/h2>\n\n\n\n<p>There is no single solution to the P0117 code because there are a lot of reasons why this code is set. Repair steps will also vary depending on the vehicle&rsquo;s make and model. That&rsquo;s why proper diagnosis is important.<\/p>\n\n\n<style>.kadence-column16144_955960-3c > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16144_955960-3c > .kt-inside-inner-col,.kadence-column16144_955960-3c > .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-column16144_955960-3c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16144_955960-3c > .kt-inside-inner-col{flex-direction:column;}.kadence-column16144_955960-3c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16144_955960-3c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16144_955960-3c{position:relative;}@media all and (max-width: 1024px){.kadence-column16144_955960-3c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16144_955960-3c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16144_955960-3c kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id16144_5bbdb7-ab > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id16144_5bbdb7-ab > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id16144_5bbdb7-ab > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-bottom:20px;padding-left:16px;padding-right:32px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id16144_5bbdb7-ab > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id16144_5bbdb7-ab > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id16144_5bbdb7-ab > .kt-row-column-wrap{padding-top:28px;padding-bottom:25px;padding-left:16px;padding-right:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id16144_5bbdb7-ab .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id16144_5bbdb7-ab alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column16144_abf9d1-8c > .kt-inside-inner-col{display:flex;}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col,.kadence-column16144_abf9d1-8c > .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-column16144_abf9d1-8c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col > *, .kadence-column16144_abf9d1-8c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16144_abf9d1-8c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16144_abf9d1-8c{position:relative;}@media all and (max-width: 1024px){.kadence-column16144_abf9d1-8c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column16144_abf9d1-8c > .kt-inside-inner-col > *, .kadence-column16144_abf9d1-8c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16144_abf9d1-8c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column16144_abf9d1-8c > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col > *, .kadence-column16144_abf9d1-8c > .kt-inside-inner-col > figure.wp-block-image, .kadence-column16144_abf9d1-8c > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column16144_abf9d1-8c > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16144_abf9d1-8c kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image16144_89571e-f3.kb-image-is-ratio-size, .kb-image16144_89571e-f3 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image16144_89571e-f3.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image16144_89571e-f3 .kb-image-is-ratio-size{align-self:unset;}.kb-image16144_89571e-f3 figure{max-width:45px;}.kb-image16144_89571e-f3 .image-is-svg, .kb-image16144_89571e-f3 .image-is-svg img{width:100%;}.kb-image16144_89571e-f3 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image16144_89571e-f3\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column16144_041b0c-13 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column16144_041b0c-13 > .kt-inside-inner-col,.kadence-column16144_041b0c-13 > .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-column16144_041b0c-13 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column16144_041b0c-13 > .kt-inside-inner-col{flex-direction:column;}.kadence-column16144_041b0c-13 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column16144_041b0c-13 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column16144_041b0c-13{position:relative;}@media all and (max-width: 1024px){.kadence-column16144_041b0c-13 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column16144_041b0c-13 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16144_041b0c-13 inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\nOne slick trick is to disconnect the ECT sensor and recheck the codes to see if the opposite code (P0118) is set with the sensor disconnected. But realize that if the wiring short that has caused the P0117 is near the ECT connector, you may inadvertently &ldquo;fix&rdquo; the P0117 while disconnecting the sensor &ndash; and this can be confusing. This particular sensor circuit isn&rsquo;t rocket science, but do your research on where the sensor is before you begin.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/p0115-code-engine-coolant-temperature-sensor-1-circuit\/\" target=\"_self\" rel=\"dofollow\" class=\"u0c27cedc42d9027c7c4d23a454e40d15\"><style> .u0c27cedc42d9027c7c4d23a454e40d15 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .u0c27cedc42d9027c7c4d23a454e40d15:active, .u0c27cedc42d9027c7c4d23a454e40d15:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u0c27cedc42d9027c7c4d23a454e40d15 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u0c27cedc42d9027c7c4d23a454e40d15 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u0c27cedc42d9027c7c4d23a454e40d15 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u0c27cedc42d9027c7c4d23a454e40d15:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">P0115 Code: Engine Coolant Temperature Sensor 1 Circuit<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>If you&rsquo;re trying to resolve the issue yourself, you&rsquo;ll need trusted resources that can give you accurate information on repairs, component location, and diagnosis. Repair guides and manuals that contain factory repair information, like ALLDATA, will give you step-by-step instructions on how to address the problem. Consider getting an ALLDATA subscription to expand your knowledge base on OBD-II diagnosis and repair.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Notes About P0117<\/h2>\n\n\n\n<p>Most of the symptoms of the P0117 code indicate performance issues with the engine. This means it must be resolved immediately. P0117 can put the vehicle in a failsafe mode, which causes the car to be relegated to a certain speed and\/or gear range.<\/p>\n\n\n\n<p>Address the issue immediately. Stop driving the vehicle and go to a shop as soon as the code registers or a combination of its symptoms appear. Ignoring this trouble code may lead to further damage to your engine and your vehicle.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/coolant-temperature-sensor-connector-1024x683.jpeg\" alt=\"coolant temperature sensor connector\" class=\"wp-image-16150\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/coolant-temperature-sensor-connector-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/coolant-temperature-sensor-connector-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/coolant-temperature-sensor-connector-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/coolant-temperature-sensor-connector-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/coolant-temperature-sensor-connector-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/coolant-temperature-sensor-connector.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\"> Repair steps will also vary depending on the vehicle&rsquo;s make and model. That&rsquo;s why proper diagnosis is important.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How the Engine Coolant Temperature Sensor Can Trigger OBD Codes<\/h2>\n\n\n\n<p>Engine coolant (ECT) and intake air temperature (IAT) sensors are what is referred to as &ldquo;negative temperature coefficient.&rdquo;<\/p>\n\n\n\n<p>The filament in a lamp and copper wiring are both &ldquo;positive temperature coefficient,&rdquo; meaning that as the temperature of the conductor increases, the resistance increases as well. But lamp filaments and copper wiring aren&rsquo;t temperature sensing elements. The Thermistor element of ECT and IAT sensors is designed to react to heat in a specific and predictable way.<\/p>\n\n\n\n<p>The ECT sensor is either submerged in the engine&rsquo;s coolant in a strategic spot so that it changes resistance as the temperature of the coolant or it measures the temperature of the cylinder head(s), because the heads are the hottest part of the engine.<\/p>\n\n\n\n<p>Two-wire temperature sensors of this type typically receive 4.6 volts on one wire, and the other wire is the &ldquo;signal return&rdquo; (ground), with both wires coming from the ECM\/PCM. Inside the PCM there is a 5 volt rail that feeds each two wire temperature sensor, but the 5 volts passes through a current dropping resistor (there is a different resistor for each sensor), thus the voltage delivered to the sensor is only 4.6 volts, which is what is reflected when the sensor is disconnected.<\/p>\n\n\n\n<p>Some ECT sensor circuits are wired so that the sensor circuit will &ldquo;shift gears&rdquo; to maintain temperature resolution voltage &ndash; the sensor&rsquo;s voltage may drop until a certain temperature is reached and then jump back to a higher voltage and begin to drop again. GM and Chrysler are the most notable platforms that do this.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"748\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/ect-sensor-track-1024x748.png\" alt=\"ect sensor track\" class=\"wp-image-68375\" style=\"width:1024px;height:748px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/ect-sensor-track-1024x748.png 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/ect-sensor-track-300x219.png 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/ect-sensor-track-768x561.png 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/ect-sensor-track-150x110.png 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/04\/ect-sensor-track.png 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Graph showing ECT sensor&rsquo;s track | Image source: Richard McCuistian<\/figcaption><\/figure>\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 ECM\/PCM is measuring sensor voltage between this internal ECM\/PCM resistor and the Thermistor built into the ECT. So, if either sensor wire (ECT signal or signal return) is cut or if there is an open circuit in the sensor itself, the voltage will read 4.6 volts, which equates to -40 degrees &ndash; which is where Fahrenheit and Celcius cross. -40 is the same temperature on both scales. This throws a P0118 code.<\/p>\n\n\n\n<p>However, if the ECT signal wire is shorted to the signal return (ground) or if the ECT signal wire is shorted to the engine block, the sensed voltage will drop to zero. Other than a scenario where the engine temperature is at meltdown levels (275&deg; F), this shorted wiring syndrome is the only scenario that will store a P0117 code.<\/p>\n\n\n\n<p>Some vehicles use this sensor via the vehicle network to report engine temperature to the Instrument cluster but more commonly, the cluster temp gauge gets its information from a dedicated engine coolant temp sensor. For that reason, if a P0117 has been stored but you&rsquo;re noticing normal temperature on your gauge, it may be a skewed sensor.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where To Get Parts To Resolve the P0117 Code<\/h2>\n\n\n\n<p>Leaving the P0117 code unresolved might leave your engine running rough. This code is usually caused by a defective engine coolant temperature sensor. Other engine issues also occasionally accompany this DTC, so getting it resolved as quickly as possible is in your best interest. Thankfully, finding a new coolant temperature sensor is quick and easy at CarParts.com.<\/p>\n\n\n\n<p>At <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>, we have a wide selection of coolant temperature sensors and other parts for your vehicle. Finding the right engine coolant temperature sensor for your vehicle is also easy with our built-in vehicle selector. Pick your vehicle&rsquo;s year, make, and model so you&rsquo;ll see only parts that fit. We only source our coolant temperature sensors from the most trusted manufacturers in the industry, so you know you&rsquo;re getting your money&rsquo;s worth.&nbsp;<\/p>\n\n\n\n<p>Order a new <a href=\"https:\/\/www.carparts.com\/coolant-temperature-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"coolant temperature sensor\">coolant temperature sensor<\/a> in just a few easy clicks at CarParts.com today.<\/p>\n\n\n\n<div class=\"shop-project\">\n\n    <h2>Shop this Project<\/h2>\n\n    <ul class=\"shop-project-list\">\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/replacement\/rd31280001\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/images\/rd31280001_3\" alt=\"Replacement &ndash; Coolant Temperature Sensor, Sold individually\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/images\/rd31280001_3\" alt=\"Replacement &ndash; Coolant Temperature Sensor, Sold individually\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/replacement\/rd31280001\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Replacement &ndash; Coolant Temperature Sensor, Sold individually\">Replacement &ndash; Coolant Temperature Sensor, Sold individually<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$4.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/replacement\/rd31280001\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/replacement\/reph312802\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/images\/reph312802_3\" alt=\"Replacement &ndash; Coolant Temperature Sensor, Sold individually\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/images\/reph312802_3\" alt=\"Replacement &ndash; Coolant Temperature Sensor, Sold individually\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/replacement\/reph312802\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Replacement &ndash; Coolant Temperature Sensor, Sold individually\">Replacement &ndash; Coolant Temperature Sensor, Sold individually<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-5.svg\" alt=\"5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$7.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/replacement\/reph312802\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/apa-uro-parts\/uro62110788115\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/uro62110788115_1\" alt=\"APA\/URO Parts&reg; &ndash; 62110788115 APA\/URO Parts OE Replacement Coolant Temperature Sensor, Sold individually\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/uro62110788115_1\" alt=\"APA\/URO Parts&reg; &ndash; 62110788115 APA\/URO Parts OE Replacement Coolant Temperature Sensor, Sold individually\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/apa-uro-parts\/uro62110788115\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"APA\/URO Parts&reg; &ndash; 62110788115 APA\/URO Parts OE Replacement Coolant Temperature Sensor, Sold individually\">APA\/URO Parts&reg; &ndash; 62110788115 APA\/URO Parts OE Replacement Coolant Temperature Sensor, Sold individually<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-0.svg\" alt=\"0 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$18.49<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/coolant-temperature-sensor\/apa-uro-parts\/uro62110788115\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n            <\/ul>\n<\/div>\n\n\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\"> 7<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Proper engine temperature must be maintained for the engine to function well. If the engine runs cold, it can consume&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0117-code-engine-coolant-temperature-sensor-1-circuit-low\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":16148,"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-16144","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 v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0117 Code: Engine Coolant Temperature Sensor 1 Circuit Low - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"The P0117 code alerts the driver of a potential problem regarding the engine coolant temperature sensor. Find out more about this code.\" \/>\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\/p0117-code-engine-coolant-temperature-sensor-1-circuit-low\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0117 Code: Engine Coolant Temperature Sensor 1 Circuit Low - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"The P0117 code alerts the driver of a potential problem regarding the engine coolant temperature sensor. Find out more about this code.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0117-code-engine-coolant-temperature-sensor-1-circuit-low\/\" \/>\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:author\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-23T10:36:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-11T03:03:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/temperature-gauge-face.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"994\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team, Richard McCuistian, ASE Certified Master Automobile Technician\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/CarPartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"CarParts.com Research Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0117-code-engine-coolant-temperature-sensor-1-circuit-low\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0117-code-engine-coolant-temperature-sensor-1-circuit-low\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1651\",\"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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