{"id":14938,"date":"2021-10-26T02:43:00","date_gmt":"2021-10-26T09:43:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=14938"},"modified":"2024-07-19T20:13:49","modified_gmt":"2024-07-20T03:13:49","slug":"p0125-code-insufficient-coolant-temperature-for-closed-loop-fuel-control","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0125-code-insufficient-coolant-temperature-for-closed-loop-fuel-control\/","title":{"rendered":"P0125 Code: Insufficient Coolant Temperature for Closed Loop Fuel Control"},"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_15bbbe-b2 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_15bbbe-b2 > .kt-inside-inner-col,.kadence-column_15bbbe-b2 > .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_15bbbe-b2 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_15bbbe-b2 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_15bbbe-b2 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_15bbbe-b2 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_15bbbe-b2{position:relative;}@media all and (max-width: 1024px){.kadence-column_15bbbe-b2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_15bbbe-b2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_15bbbe-b2 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-226c56  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-19fbb3\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_107067-d0, .wp-block-kadence-advancedheading.kt-adv-heading_107067-d0[data-kb-block=\"kb-adv-heading_107067-d0\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_107067-d0 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_107067-d0[data-kb-block=\"kb-adv-heading_107067-d0\"] 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_107067-d0 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_107067-d0[data-kb-block=\"kb-adv-heading_107067-d0\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_107067-d0 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_107067-d0\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Code P0125 code stands for &ldquo;Insufficient Coolant Temperature for Closed Loop Fuel Control.&rdquo; It can register in your vehicle&rsquo;s system if the PCM notices that the engine isn&rsquo;t reaching its operating temperature.<\/li><li>A damaged ECT sensor, low coolant levels, and a stuck thermostat are common reasons why OBD can log this code.<\/li><li>If your engine is running too cold, it can consume more fuel and exhibit poor heater performance.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>What does the P0125 code mean and what causes it? This guide will help you find out more. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0125 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0125 code stands for &ldquo;Insufficient Coolant Temperature for Closed Loop Fuel Control.&rdquo; It might register if the engine does not reach its normal operating temperature.<\/p>\n\n\n\n<p>A similar code is the P0128, which is a lesser manifestation of this same condition. <strong>Usually the P0125 means the engine is running very cold &ndash; the <a href=\"https:\/\/www.carparts.com\/blog\/p0128-coolant-temperature-below-thermostat-regulating-temperature\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"P0128\">P0128<\/a> means it&rsquo;s running only slightly cold<\/strong>. But both usually have the same root cause(s).<\/p>\n\n\n\n<p>The issue probably won&rsquo;t negatively affect drivability, but you may notice decreased fuel economy and poor heater performance.<\/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<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0125 Code?<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD-II codes\">OBD-II codes<\/a> have a variety of possible causes and triggers. The same goes for the P0125 code. If you encounter this code, you might be looking at problems relating to the engine cooling system, particularly the ECT sensor or thermostat. Below are the possible causes of this trouble code: <\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Defective or <a href=\"https:\/\/www.carparts.com\/blog\/engine-coolant-temperature-sensor-purpose-location-and-failure-signs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"damaged ECT sensor\">damaged ECT sensor<\/a><\/li><li>Damaged <a href=\"https:\/\/www.carparts.com\/coolant-temperature-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"coolant temperature sensor\">coolant temperature sensor<\/a> wiring or connection<\/li><li>Low coolant levels<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/coolant-leak-symptoms-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Coolant leaks\">Coolant leaks<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/thermostat\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Thermostat\">Thermostat<\/a> is stuck open <\/li><li>Damaged ECM<\/li><\/ul>\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\/p2181-code-cooling-system-performance\/\" target=\"_self\" rel=\"dofollow\" class=\"u29e388337dbd548d820ed85bd085c895\"><style> .u29e388337dbd548d820ed85bd085c895 { 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; } .u29e388337dbd548d820ed85bd085c895:active, .u29e388337dbd548d820ed85bd085c895:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u29e388337dbd548d820ed85bd085c895 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u29e388337dbd548d820ed85bd085c895 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u29e388337dbd548d820ed85bd085c895 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u29e388337dbd548d820ed85bd085c895: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\">P2181 Code: Cooling System Performance<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p><strong>Important Note:<\/strong> Some late 90s Toyotas will set a P0125 even though the engine is running at normal temperature because of an O2 sensor heater issue without even setting a code for the heater. This is due to the fact that the O2 sensor heater accelerates closed loop operation.<\/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\/08\/low-coolant-level-1024x683.jpeg\" alt=\"low coolant level\" class=\"wp-image-14963\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/low-coolant-level-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/low-coolant-level-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/low-coolant-level-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/low-coolant-level-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/low-coolant-level-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/low-coolant-level.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Another possible cause of code P0125 is low coolant level.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0125 Code?<\/h2>\n\n\n\n<p>The P0125 code might not register as urgent. But all the same, if the check engine light lights up and this code appears on your scanner, it pays to check if the symptoms match up. Early detection of this problem can help save you time, effort, and resources in future repairs. Here are the common symptoms of this DTC:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Illuminated check engine light<\/li><li>Bad fuel economy<\/li><li>Poor heater performance<\/li><li>Car may overheat (but not likely &ndash; usually it&rsquo;ll run too cold)<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0125 Code<\/h2>\n\n\n\n<p>From a defective engine thermostat to a damaged engine cooling fan, many issues can trigger the P0125 code, making it tricky to identify its underlying cause. Watch the videos below to help you learn more about the diagnostic process: <\/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=\"How to Test and Replace an Engine Coolant Temperature Sensor P0115 \/ P0125\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/bPAIFL8VH9w?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=\"Ford 2.0L 2.3L 2.5L Engines P0125 P0128 Insufficient Coolant Temp: Thermostat Housing Replacement\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/VNcRPxGXCz8?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 P0125 Code<\/h2>\n\n\n\n<p>Because a one-size-fits-all solution doesn&rsquo;t exist for OBD-II trouble codes, you must figure out the appropriate fix for your issue. Leave the task to a professional if you are not well-versed with automotive repair. Otherwise, start looking for the exact cause of the problem. Then, using <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 auto repair resources and guides\">online auto repair resources and guides<\/a>, determine the most effective way to resolve the issue.<\/p>\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\/p0507-code-idle-control-system-rpm-higher-than-expected\/\" target=\"_self\" rel=\"dofollow\" class=\"ubd99d10e6184f8e5bcfe1686d7d8ecff\"><style> .ubd99d10e6184f8e5bcfe1686d7d8ecff { 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; } .ubd99d10e6184f8e5bcfe1686d7d8ecff:active, .ubd99d10e6184f8e5bcfe1686d7d8ecff:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .ubd99d10e6184f8e5bcfe1686d7d8ecff { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .ubd99d10e6184f8e5bcfe1686d7d8ecff .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .ubd99d10e6184f8e5bcfe1686d7d8ecff .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .ubd99d10e6184f8e5bcfe1686d7d8ecff: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\">P0507 Code: Idle Control System RPM Higher than Expected<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>Want to expand your knowledge on factory repair? Invest in an ALLDATA single-vehicle subscription. It will help you fix not only the P0125 code but also any other issues that your vehicle may encounter in the future.<\/p>\n\n\n\n<p>Finally, keep in mind that the solution for the P0125 code varies based not only on what triggered it but also on the vehicle&rsquo;s make and model. So be sure to <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check your owner&rsquo;s manual\">check your owner&rsquo;s manual<\/a> before implementing repairs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Notes About P0125<\/h2>\n\n\n\n<p>The trouble code P0125 is typically associated with other codes that could help you narrow down the cause of the problem. P0126 as well as P0128 can occur along with this trouble code. P0126 means &ldquo;Insufficient Coolant Temperature for Stable Operation,&rdquo; while P0128 means &ldquo;Engine Coolant Temperature Below Thermostat Regulating Temperature.&rdquo; If the P0125 occurs with one of these, you&rsquo;ll need to look up their causes and symptoms so you can determine the cause of this engine problem more efficiently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why P0125 Must Be Addressed As Soon As Possible<\/h2>\n\n\n\n<p>Like so many other components we don&rsquo;t often think about, the ECM\/PCM has within its programming the opening temperature of the engine&rsquo;s cooling system thermostat; what that means is the the ECM\/PCM is programmed to recognize <strong>when the thermostat opens and closes<\/strong> based on coolant temperature.<\/p>\n\n\n<style>.kadence-column_f90353-26 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_f90353-26 > .kt-inside-inner-col,.kadence-column_f90353-26 > .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_f90353-26 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_f90353-26 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_f90353-26 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_f90353-26 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_f90353-26{position:relative;}@media all and (max-width: 1024px){.kadence-column_f90353-26 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_f90353-26 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_f90353-26 kb-section-dir-vertical kb-section-sm-dir-vertical pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>#kt-layout-id_e6f8b9-c4 > .kt-row-column-wrap{align-content:start;}:where(#kt-layout-id_e6f8b9-c4 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}#kt-layout-id_e6f8b9-c4 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:var( --global-kb-row-default-top, 25px );padding-bottom:var( --global-kb-row-default-bottom, 25px );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)));}#kt-layout-id_e6f8b9-c4 > .kt-row-layout-overlay{opacity:0.00;}#kt-layout-id_e6f8b9-c4 .kt-row-layout-bottom-sep{height:100px;}#kt-layout-id_e6f8b9-c4 .kt-row-layout-bottom-sep svg{width:100%;}#kt-layout-id_e6f8b9-c4 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}#kt-layout-id_e6f8b9-c4 .kt-row-layout-top-sep{height:100px;}#kt-layout-id_e6f8b9-c4 .kt-row-layout-top-sep svg{width:100%;}#kt-layout-id_e6f8b9-c4 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){#kt-layout-id_e6f8b9-c4 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){#kt-layout-id_e6f8b9-c4 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){#kt-layout-id_e6f8b9-c4 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){#kt-layout-id_e6f8b9-c4 > .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);}#kt-layout-id_e6f8b9-c4 .kt-row-layout-bottom-sep{height:px;}#kt-layout-id_e6f8b9-c4 .kt-row-layout-bottom-sep svg{width:%;}}<\/style>\n<div class=\"wp-block-kadence-rowlayout alignnone pro-tip-wrap\"><div id=\"kt-layout-id_e6f8b9-c4\" class=\"kt-row-layout-inner kt-layout-id_e6f8b9-c4\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-gutter-none kt-v-gutter-default kt-row-valign-top kt-row-layout-right-golden kt-tab-layout-right-golden kt-m-colapse-left-to-right kt-mobile-layout-right-golden  kt-custom-first-width-10  kt-custom-second-width-90\"><style>.kadence-column_4c44c9-3a > .kt-inside-inner-col{display:flex;}.kadence-column_4c44c9-3a > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_4c44c9-3a > .kt-inside-inner-col,.kadence-column_4c44c9-3a > .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_4c44c9-3a > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column_4c44c9-3a > .kt-inside-inner-col > *, .kadence-column_4c44c9-3a > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_4c44c9-3a > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_4c44c9-3a > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column_4c44c9-3a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_4c44c9-3a{position:relative;}@media all and (max-width: 1024px){.kadence-column_4c44c9-3a > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column_4c44c9-3a > .kt-inside-inner-col > *, .kadence-column_4c44c9-3a > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_4c44c9-3a > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_4c44c9-3a > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column_4c44c9-3a > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column_4c44c9-3a > .kt-inside-inner-col > *, .kadence-column_4c44c9-3a > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_4c44c9-3a > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_4c44c9-3a > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_4c44c9-3a kb-section-dir-horizontal kb-section-md-dir-horizontal pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image_cbb497-76.kb-image-is-ratio-size, .kb-image_cbb497-76 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image_cbb497-76.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image_cbb497-76 .kb-image-is-ratio-size{align-self:unset;}.kb-image_cbb497-76 figure{max-width:45px;}.kb-image_cbb497-76 .image-is-svg, .kb-image_cbb497-76 .image-is-svg img{width:100%;}.kb-image_cbb497-76 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image_cbb497-76\"><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-column_e9f42c-3f > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_e9f42c-3f > .kt-inside-inner-col,.kadence-column_e9f42c-3f > .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_e9f42c-3f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_e9f42c-3f > .kt-inside-inner-col{flex-direction:column;}.kadence-column_e9f42c-3f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_e9f42c-3f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_e9f42c-3f{position:relative;}@media all and (max-width: 1024px){.kadence-column_e9f42c-3f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_e9f42c-3f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-2 kadence-column_e9f42c-3f 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>\nYou can do this monitoring of the thermostat opening yourself by carefully watching your scan tool datastream as the engine warms up, albeit with a bit of practice. And it goes without saying that the ECM\/PCM knows the thermostat&rsquo;s opening temperature as well as what normal healthy engine temperature should be.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/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\/p00b6-code-radiator-coolant-temperature-engine-coolant-temperature-correlation\/\" target=\"_self\" rel=\"dofollow\" class=\"u137a6b0912970db0cb2f57c649b942e0\"><style> .u137a6b0912970db0cb2f57c649b942e0 { 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; } .u137a6b0912970db0cb2f57c649b942e0:active, .u137a6b0912970db0cb2f57c649b942e0:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u137a6b0912970db0cb2f57c649b942e0 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u137a6b0912970db0cb2f57c649b942e0 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u137a6b0912970db0cb2f57c649b942e0 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u137a6b0912970db0cb2f57c649b942e0: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\">P00B6 Code: Radiator Coolant Temperature \/ Engine Coolant Temperature Correlation<\/span><\/div><\/a><\/div><\/div>\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\/08\/coolant-temperature-sensor-1024x1024.jpeg\" alt=\"coolant temperature sensor\" class=\"wp-image-14961\" width=\"1024\" height=\"1024\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/coolant-temperature-sensor-1024x1024.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/coolant-temperature-sensor-300x300.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/coolant-temperature-sensor-768x768.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/coolant-temperature-sensor-75x75.jpeg 75w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/coolant-temperature-sensor-600x600.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/coolant-temperature-sensor-928x928.jpeg 928w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/coolant-temperature-sensor-150x150.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/coolant-temperature-sensor.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption><em>One possible cause of code P0125<\/em> is damaged coolant temperature sensor wiring or connection.<\/figcaption><\/figure>\n\n\n\n<p>An engine&rsquo;s operating temperature affects its performance. If the engine runs too cold, fuel economy and even <strong>engine mechanical health<\/strong> will be impacted. Again, fuel economy will be reduced, but secondly, sludge can form in the crankcase on an engine that runs too cold for too long.<\/p>\n\n\n\n<p>Let&rsquo;s all remember that some codes may illuminate the MIL (Check Engine) light without noticeable symptoms, and those codes tend to be ignored by many drivers.<\/p>\n\n\n\n<p>The problem with that <em>&ldquo;ignore the light because I know what the code is&rdquo;<\/em> strategy is that, unless you have an active misfire (<a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"it flashes if a misfire is bad enough\">it flashes if a misfire is bad enough<\/a>), the MIL light only knows how to tell you there&rsquo;s a problem &ndash; <strong>it doesn&rsquo;t tell you how many problems the ECM\/PCM has detected<\/strong>.<\/p>\n\n\n\n<p>So, for example, if you drop by the parts store or use your own scanner and you get, for example, a P0125 code and then think &ldquo;I&rsquo;ll take care of that later,&rdquo; when &ldquo;later&rdquo; finally arrives, you discover you have about five or six different problems that have piled up behind the first one that illuminated the MIL.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fix the P0125 Code With a New ECT Sensor<\/h2>\n\n\n\n<p>A defective ECT sensor can trigger the P0125 code and cause the engine and heater to run inefficiently. These might seem like minor issues, but they can be quite annoying to live with in the long run. To make your vehicle run as efficiently as possible, you should replace the faulty ECT sensor right away. Good thing CarParts.com is a trusted and reliable source of replacement parts.<\/p>\n\n\n\n<p>Here at CarParts.com, we have a wide selection of OE-grade parts like ECT sensors. We source our parts&nbsp; from only the most trusted brands in the industry. These components are made with precise tolerances that match the original part, ensuring a perfect fit.<\/p>\n\n\n\n<p>Need a new <a href=\"https:\/\/www.carparts.com\/coolant-temperature-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ECT sensor\">ECT sensor<\/a> for your vehicle? Shop for one today here at CarParts.com and we can ship the part to your address in as fast as two business days!<\/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\/coolant-temperature-sensor\" target=\"_blank\" aria-label=\"Coolant Temperature Sensor\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/reph312802_1\">\n<strong>Coolant Temperature Sensor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/thermostat\" target=\"_blank\" aria-label=\"Thermostat\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/reps318002_1\">\n<strong>Thermostat<\/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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>What does the P0125 code mean and what causes it? This guide will help you find out more. What Does&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0125-code-insufficient-coolant-temperature-for-closed-loop-fuel-control\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":14962,"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":[1251,1252,332],"ppma_author":[2607,2985],"class_list":{"0":"post-14938","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-coolant-level-sensor","9":"tag-coolant-temperature-sensor","10":"tag-thermostat","11":"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>P0125 Code: Insufficient Coolant Temperature for Closed Loop Fuel Control - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Did your scanner register the P0125 code? 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