{"id":14932,"date":"2021-06-03T01:30:00","date_gmt":"2021-06-03T08:30:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=14932"},"modified":"2026-06-27T06:38:09","modified_gmt":"2026-06-27T13:38:09","slug":"p0327-knock-sensor-1-circuit-low-input-bank-1-or-single-sensor","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0327-knock-sensor-1-circuit-low-input-bank-1-or-single-sensor\/","title":{"rendered":"P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)"},"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-column14932_ab0e81-8c > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column14932_ab0e81-8c > .kt-inside-inner-col,.kadence-column14932_ab0e81-8c > .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-column14932_ab0e81-8c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column14932_ab0e81-8c > .kt-inside-inner-col{flex-direction:column;}.kadence-column14932_ab0e81-8c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column14932_ab0e81-8c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column14932_ab0e81-8c{position:relative;}@media all and (max-width: 1024px){.kadence-column14932_ab0e81-8c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column14932_ab0e81-8c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column14932_ab0e81-8c inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-c49b08  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-5ddb75\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading14932_d51d2f-f3, .wp-block-kadence-advancedheading.kt-adv-heading14932_d51d2f-f3[data-kb-block=\"kb-adv-heading14932_d51d2f-f3\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading14932_d51d2f-f3 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading14932_d51d2f-f3[data-kb-block=\"kb-adv-heading14932_d51d2f-f3\"] 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-heading14932_d51d2f-f3 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading14932_d51d2f-f3[data-kb-block=\"kb-adv-heading14932_d51d2f-f3\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading14932_d51d2f-f3 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading14932_d51d2f-f3\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DT P0327 stands for &ldquo;Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor).&rdquo;<\/li>\n\n\n\n<li>This code triggers when the PCM detects low voltage readings from your vehicle&rsquo;s primary knock sensor circuit.<\/li>\n\n\n\n<li>Though symptoms don&rsquo;t always manifest, the most common symptoms are a lit check engine light, engine pinging on acceleration, and fluctuating engine RPM.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">Your vehicle is equipped with a number of sensors that are used for monitoring all kinds of information. Among them is the knock sensor, which is a listening device located near the engine that detects vibrations caused by engine detonation or &ldquo;knock.&rdquo;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">P0327 is one of several trouble codes related to a faulty knock sensor. If your scan tool is showing this code, read on to learn more about the symptoms, probable causes, and other pertinent information<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0327 Code Mean?<strong>&nbsp;<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Diagnostic trouble code (DTC) P0327 stands for &ldquo;Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor).&rdquo; It is triggered when the powertrain control module (PCM) detects very low voltage readings from your vehicle&rsquo;s primary knock sensor circuit.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Take note that the voltage value may vary depending on your vehicle&rsquo;s make and model.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For an in-depth discussion of what knock sensors are and how they work, read our explanation <a href=\"#What_Do_Knock_Sensors_Do\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"here\">here<\/a>.<\/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\/08\/mechanic-using-car-diagnostic-scan-tool-1024x683.jpeg\" alt=\"Mechanic using car diagnostic scan tool\" class=\"wp-image-14934\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/mechanic-using-car-diagnostic-scan-tool-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/mechanic-using-car-diagnostic-scan-tool-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/mechanic-using-car-diagnostic-scan-tool-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/mechanic-using-car-diagnostic-scan-tool-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/mechanic-using-car-diagnostic-scan-tool-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/mechanic-using-car-diagnostic-scan-tool.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">  <em>If your scan tool is showing <\/em> code P0327, the problem could be related to a faulty knock sensor. <\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0327 Code?&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">P0327 is a generic code. This means that it is supported by various makes and models. However, the diagnostic and repair procedures may vary depending on your vehicle&rsquo;s make and model.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here are the possible triggers of a P0327 code:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faulty knock sensor<\/li>\n\n\n\n<li>Knock sensor circuit problem<\/li>\n\n\n\n<li>Issues with the PCM (e.g., software needs update)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0327 Code?&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Symptoms related to the P0327 code may vary depending on your vehicle. Here are the common ones you should watch for:&nbsp;<\/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=\"Illuminated check engine light\">Illuminated check engine light<\/a>&nbsp;<\/li>\n\n\n\n<li>Engine pings on acceleration<\/li>\n\n\n\n<li>The engine may not exhibit noticeable symptoms&nbsp;<\/li>\n\n\n\n<li>Fluctuating <a href=\"https:\/\/www.carparts.com\/blog\/what-does-car-rpm-stand-for\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine RPM\">engine RPM<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In some cases, the engine may not exhibit any noticeable symptoms related to the P0327 code. As a general rule, once your check engine light illuminates, make sure to have your vehicle checked by your mechanic.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0327 Code&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With numerous possible causes, it usually takes an expert to be able to pinpoint the underlying cause of an <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD-II\">OBD-II<\/a> code. However, that doesn&rsquo;t mean that you can&rsquo;t attempt to diagnose the issue yourself, especially if you have some automotive repair skills and know-how.&nbsp;&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0327 Code&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The solution for the P0327 code varies based on two main factors: what triggered the code, and your vehicle&rsquo;s make and model. This can make it difficult to determine the right fix if you aren&rsquo;t well-versed in automotive repair or OBD-II codes in general.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not only will you have to identify the exact cause of the issue, but you also need to ensure that the solution is appropriate to your vehicle.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ready to tackle the P0327? Once you&rsquo;ve diagnosed the problem that&rsquo;s causing it, the next step is to do some research on the repairs that have worked for other vehicle owners who have experienced the code due to the same issue. The exact repair may differ depending on the vehicle, so make sure to limit your research to similar vehicles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, replacing the affected knock sensor is reported to have resolved code P0327 in certain Chevy vehicles, so if you have a Chevy Astro or Silverado 1500, this could work for you as well&#8288;&mdash;provided that the knock sensor is the underlying cause for you, of course.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When doing any kind of work on your car, make sure to consult <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"online auto repair resources\">online auto repair resources<\/a> to ensure that you are guided accordingly. You can also secure an ALLDATA subscription for single vehicles for in-depth factory repair information.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And remember&#8288;&mdash;always consult your owner&rsquo;s manual when doing any DIY work on your vehicle.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Do Knock Sensors Do?&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To begin with, it&rsquo;s important to understand what engine &ldquo;knock&rdquo; is and what the knock sensor is listening for. Some old time drivers refer to this as &ldquo;valve rattle,&rdquo; but it has nothing to do with the valves.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Some old time drivers refer to engine knock as &ldquo;valve rattle,&rdquo; but it has nothing to do with the valves.<\/p>\n<cite>&ndash;<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<h3 class=\"wp-block-heading\">What Knock Sensors Listen For<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When a cylinder is healthy, there will be no knock at all. But with the ultra lean mixtures being used in modern engines, combustion temperature tends to be hotter. And when the combustion heat is transferred to carbon deposits on the cylinder head and piston crown, some of the carbon can become hot enough to begin the combustion process <strong>before the <a href=\"https:\/\/www.carparts.com\/spark-plug\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"spark plug\">spark plug<\/a> fires<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When that happens, the resulting multiple flame fronts can come together and impact the crown of the piston as it is traveling upward with enough force to make the &ldquo;ping&rdquo; sound that means &ldquo;<strong>detonation<\/strong>&rdquo; is happening.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Part of the reason this happens is that, as carbon begins to cake the head and the piston crown, those layers take up room in the combustion chamber so that compression is increased, and the combustion event is <strong>hotter than normal<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In bygone years, when the ignition timing was adjusted by turning the distributor, if the timing was too far advanced, a similar thing would happen, only that was called &ldquo;<strong>spark knock<\/strong>,&rdquo; because the spark is actually happening before it is supposed to, and the resulting combustion event is &ldquo;pinging&rdquo; on the head of the piston as it is rising.<\/p>\n\n\n\n<div class=\"rsi-card\">\n  <div class=\"rsi-thumb\">\n    <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/d_noimage.jpg\/b_white\/e_sharpen,e_auto_brightness,e_auto_contrast\/f_auto\/q_auto:eco,dpr_auto\/w_873,h_873,c_pad\/images\/prmapcps148_4\">\n  <\/div>\n  <div class=\"rsi-info\">\n    <span class=\"rsi-title\"> How to Choose the Right Knock Sensor Before You Add It to Cart<\/span>\n    <span class=\"rsi-desc\">Not sure which knock sensor to order? Match mounting style, connector, and quantity with this guide.<\/span>\n    <a href=\"https:\/\/www.carparts.com\/blog\/how-to-choose-the-right-knock-sensor-before-you-add-it-to-cart-quickref\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Discover Your Options\">Discover Your Options<\/a>\n  <\/div>\n<\/div>\n\n<style>.kadence-column14932_431458-61 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column14932_431458-61 > .kt-inside-inner-col,.kadence-column14932_431458-61 > .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-column14932_431458-61 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column14932_431458-61 > .kt-inside-inner-col{flex-direction:column;}.kadence-column14932_431458-61 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column14932_431458-61 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column14932_431458-61{position:relative;}@media all and (max-width: 1024px){.kadence-column14932_431458-61 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column14932_431458-61 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column14932_431458-61 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-id14932_46b35a-2d > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id14932_46b35a-2d > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id14932_46b35a-2d > .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-id14932_46b35a-2d > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id14932_46b35a-2d .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id14932_46b35a-2d .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id14932_46b35a-2d .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id14932_46b35a-2d .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id14932_46b35a-2d .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id14932_46b35a-2d .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id14932_46b35a-2d > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id14932_46b35a-2d .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id14932_46b35a-2d .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id14932_46b35a-2d > .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-id14932_46b35a-2d .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id14932_46b35a-2d .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id14932_46b35a-2d 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-column14932_c157e8-2b > .kt-inside-inner-col{display:flex;}.kadence-column14932_c157e8-2b > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column14932_c157e8-2b > .kt-inside-inner-col,.kadence-column14932_c157e8-2b > .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-column14932_c157e8-2b > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column14932_c157e8-2b > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column14932_c157e8-2b > .kt-inside-inner-col > *, .kadence-column14932_c157e8-2b > .kt-inside-inner-col > figure.wp-block-image, .kadence-column14932_c157e8-2b > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column14932_c157e8-2b > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column14932_c157e8-2b > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column14932_c157e8-2b{position:relative;}@media all and (max-width: 1024px){.kadence-column14932_c157e8-2b > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column14932_c157e8-2b > .kt-inside-inner-col > *, .kadence-column14932_c157e8-2b > .kt-inside-inner-col > figure.wp-block-image, .kadence-column14932_c157e8-2b > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column14932_c157e8-2b > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column14932_c157e8-2b > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column14932_c157e8-2b > .kt-inside-inner-col > *, .kadence-column14932_c157e8-2b > .kt-inside-inner-col > figure.wp-block-image, .kadence-column14932_c157e8-2b > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column14932_c157e8-2b > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column14932_c157e8-2b kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image14932_ef9ec9-7a.kb-image-is-ratio-size, .kb-image14932_ef9ec9-7a .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image14932_ef9ec9-7a.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image14932_ef9ec9-7a .kb-image-is-ratio-size{align-self:unset;}.kb-image14932_ef9ec9-7a figure{max-width:45px;}.kb-image14932_ef9ec9-7a .image-is-svg, .kb-image14932_ef9ec9-7a .image-is-svg img{width:100%;}.kb-image14932_ef9ec9-7a .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image14932_ef9ec9-7a\"><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-column14932_4689b8-7e > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column14932_4689b8-7e > .kt-inside-inner-col,.kadence-column14932_4689b8-7e > .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-column14932_4689b8-7e > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column14932_4689b8-7e > .kt-inside-inner-col{flex-direction:column;}.kadence-column14932_4689b8-7e > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column14932_4689b8-7e > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column14932_4689b8-7e{position:relative;}@media all and (max-width: 1024px){.kadence-column14932_4689b8-7e > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column14932_4689b8-7e > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column14932_4689b8-7e 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>\nFuel of a lower octane than the vehicle is rated for can also cause detonation because of the speed that the fuel burns. If 87 octane gasoline is used in an engine that is tuned for 93 octane gas will typically suffer detonation under load. Likewise, if 93 octane gas is used in a vehicle tuned for 87 octane, cold stumbles may result.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">How Knock Sensors Work<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Okay, so, your knock sensor is listening for a particular frequency and is tuned for your engine. The kind of engine knock the sensor is &ldquo;listening&rdquo; for is measured in <strong>thousands of cycles per second (kHz)<\/strong>. Engineers determine the knock frequency for the engine and the window of crankshaft rotation where each cylinder will experience detonation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Any &ldquo;knock&rdquo; the knock sensor hears that doesn&rsquo;t match the expected frequency or doesn&rsquo;t happen within the expected window for one of the cylinders is ignored. This is also apropos in that the ECM\/PCM can determine which cylinder(s) the pinging is coming from.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The good news is that, with <strong>coil-on-plug engines<\/strong>, the timing for each cylinder can be controlled separately &ndash; thus if only one engine is &ldquo;pinging,&rdquo; the ignition timing of that particular cylinder can be retarded just enough that the pinging stops.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As for sensor operation, depending on severity of the measured knock, the sensor will produce spikes from 0 &ndash; 4.5 volts. Even on a normally operating engine, there will be some activity from the knock sensor and the ECM\/PCM knows this. <strong>When the engine is running and the knock sensor doesn&rsquo;t produce any kind of signal at all, code P0327 is set<\/strong>.<\/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\/2021\/06\/knock-sensor-installed-in-a-car-1024x683.jpg\" alt=\"knock sensor installed in a car\" class=\"wp-image-39663\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/knock-sensor-installed-in-a-car-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/knock-sensor-installed-in-a-car-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/knock-sensor-installed-in-a-car-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/knock-sensor-installed-in-a-car-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/knock-sensor-installed-in-a-car-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/knock-sensor-installed-in-a-car.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Some engines will have the knock sensor screwed into the side of the engine block.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Knock Sensors in Different Vehicles<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Some early knock sensors receive a 2.5 volt feed from the Engine Controller that change when engine knock is detected, and if this voltage is shorted to zero or rises to 5 volts, a code is set.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some V engines will have 2 knock sensors in the valley under the intake, and on those engines, the knock sensors are in &ldquo;wells&rdquo; covered with a rubber grommet. If a grommet leaks, water will flood the sensor and ruin it. This happens a lot on the 4.8\/5.3\/6.0L Chevy V8s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some engines will have the knock sensor screwed into the side of the engine block and occasionally one will actually be sensing the knock through the coolant in the side of the engine cooling jackets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A bad knock sensor should not be taken lightly because it may lead to engine damage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a New Knock Sensor for Your Vehicle<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most common causes for a P0327 is a damaged knock sensor, which means replacing it is your best bet at fixing the code. Thankfully, replacing your knock sensor is easy with the help of CarParts.com.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You don&rsquo;t have to take a step outside your house to shop for a brand-new knock sensor. All you need to do is visit <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>, use the vehicle selector to view compatible parts, then adjust the filters to match your preferred brand, specs, and price range. Find exactly what you need and check out securely in minutes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our knock sensors are sourced from the most trusted names in the industry and are available at unbeatable prices. On top of that, our products are on hand and ready to ship from strategically located warehouses across the US. Get your new knock sensor in as fast as two business days after placing your order.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Don&rsquo;t hold off on replacing your knock sensor. Check out our collection of high-quality <a href=\"https:\/\/www.carparts.com\/knock-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"knock sensors\">knock sensors<\/a> now at CarParts.com.<\/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\/knock-sensor\" target=\"_blank\" aria-label=\"Knock 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\/repp311201_1\">\n<strong>Knock Sensor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/spark-plug\" target=\"_blank\" aria-label=\"Spark Plug\" 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\/ng2164_1\">\n<strong>Spark Plug<\/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\"> 7<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Your vehicle is equipped with a number of sensors that are used for monitoring all kinds of information. Among them&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0327-knock-sensor-1-circuit-low-input-bank-1-or-single-sensor\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":14935,"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":[1443],"ppma_author":[2607,2985],"class_list":["post-14932","post","type-post","status-publish","format-standard","has-post-thumbnail","category-obd-ii-trouble-codes","tag-knock-sensor","entry"],"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Address the P0135 code by learning all about its meaning, possible causes, and common symptoms. Read on to know more!\" \/>\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\/p0327-knock-sensor-1-circuit-low-input-bank-1-or-single-sensor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Address the P0135 code by learning all about its meaning, possible causes, and common symptoms. Read on to know more!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0327-knock-sensor-1-circuit-low-input-bank-1-or-single-sensor\/\" \/>\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=\"2021-06-03T08:30:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-27T13:38:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/08\/closeup-of-opened-engine-cylinder-head.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1521\" \/>\n\t<meta property=\"og:image:height\" content=\"1140\" \/>\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=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0327-knock-sensor-1-circuit-low-input-bank-1-or-single-sensor\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0327-knock-sensor-1-circuit-low-input-bank-1-or-single-sensor\\\/\"},\"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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He has produced a coffee table book of digital watercolors called \u201cMemories of South Alabama\u201d created from his personal photos, along with a dozen Christian fiction short original novels and a collection of short stories, all available in Kindle or softcover format. 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He has won two International Automotive Media Awards for technical articles published in trade magazines.<\/p><\/li>\r\n<li><p>Has attended hundreds of hours of automotive training from OEMs including GM, Volkswagen, Mazda, Renault, Jeep, Chrysler, as well as additional training at events like KC Vision and MACS (Mobile Air Climate Systems Association).<\/p><\/li>\r\n<li><p>Taught college level auto mechanics for 19 years.<\/p><\/li>\r\n<li><p>Has written for automotive training companies (including course development work for training companies in Canada and the Netherlands) and has been hired to teach professional trade show technician courses at multiple training events in Texas and Alabama.<\/p><\/li>\r\n<li><p>While still teaching at the college level, Richard launched a new automotive program in Geneva, Alabama, setting up a dual enrollment department in a new building, organizing the shop and classroom, teaching morning classes to high school students for 2 years while still teaching at the college in the afternoon.<\/p><\/li>\r\n<li><p>Richard\u2019s college program at Lurleen B. Wallace Community College worked at professional shop speed during his tenure to prepare graduates for production level work in the real world.<\/p><\/li>\r\n<\/ul>"}],"_links":{"self":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/14932","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/users\/1651"}],"replies":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/comments?post=14932"}],"version-history":[{"count":0,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/posts\/14932\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media\/14935"}],"wp:attachment":[{"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/media?parent=14932"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/categories?post=14932"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/tags?post=14932"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.carparts.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=14932"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}