{"id":77269,"date":"2022-11-02T23:37:21","date_gmt":"2022-11-03T06:37:21","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=77269"},"modified":"2025-12-18T22:13:53","modified_gmt":"2025-12-19T06:13:53","slug":"p0391-code-camshaft-position-sensor-b-circuit-range-performance-bank-2","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0391-code-camshaft-position-sensor-b-circuit-range-performance-bank-2\/","title":{"rendered":"P0391 Code: Camshaft Position Sensor \u201cB\u201d Circuit Range\/Performance Bank 2"},"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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column77269_e5ff22-e2 > .kt-inside-inner-col,.kadence-column77269_e5ff22-e2 > .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-column77269_e5ff22-e2 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column77269_e5ff22-e2 > .kt-inside-inner-col{flex-direction:column;}.kadence-column77269_e5ff22-e2 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column77269_e5ff22-e2 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column77269_e5ff22-e2{position:relative;}@media all and (max-width: 1024px){.kadence-column77269_e5ff22-e2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column77269_e5ff22-e2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column77269_e5ff22-e2 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-aed3c4  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-4d5c83\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading77269_b7ba8d-26, .wp-block-kadence-advancedheading.kt-adv-heading77269_b7ba8d-26[data-kb-block=\"kb-adv-heading77269_b7ba8d-26\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading77269_b7ba8d-26 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading77269_b7ba8d-26[data-kb-block=\"kb-adv-heading77269_b7ba8d-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-heading77269_b7ba8d-26 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading77269_b7ba8d-26[data-kb-block=\"kb-adv-heading77269_b7ba8d-26\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading77269_b7ba8d-26 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading77269_b7ba8d-26\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Diagnostic trouble code (DTC) P0391 is defined as &ldquo;Camshaft Position Sensor &lsquo;B&rsquo; Circuit\/Range Performance Bank 2.&rdquo; This code is triggered if the powertrain control module (PCM) fails to get a signal from the camshaft position sensor that the no. 1 cylinder is in the top dead center position.<\/li>\n\n\n\n<li>The P0391 code can be caused by a faulty camshaft position sensor, wiring issues, a failed tone ring, a failed timing chain, or a faulty PCM.<\/li>\n\n\n\n<li>A triggered P0391 code can result in symptoms like poor engine performance, a no-start condition, increased fuel consumption, stalling, and an illuminated check engine light.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module\">powertrain control module<\/a> (PCM) uses the information from the <a href=\"https:\/\/www.carparts.com\/camshaft-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"camshaft position sensor\">camshaft position sensor<\/a> to determine the correct injection sequence. Typically found in the engine block or <a href=\"https:\/\/www.carparts.com\/cylinder-head\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"cylinder head\">cylinder head<\/a>, the camshaft position sensor sends a pulse signal to the PCM once it determines that the no. 1 cylinder is in the <a href=\"https:\/\/www.carparts.com\/blog\/finding-top-dead-center-why-is-it-critical-to-your-car\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"top dead center\">top dead center<\/a> position. If the PCM fails to get a signal from the camshaft position sensor, on-board diagnostics will log a P0391 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0391 Code Mean?<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Diagnostic trouble code\">Diagnostic trouble code<\/a> (DTC) P0391 stands for &ldquo;Camshaft Position Sensor &lsquo;B&rsquo; Circuit\/Range Performance Bank 2.&rdquo;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"681\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-sends-a-pulse-signal-to-the-pcm-1024x681.jpg\" alt=\"camshaft position sensor sends a pulse signal to the pcm\" class=\"wp-image-77274\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-sends-a-pulse-signal-to-the-pcm-1024x681.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-sends-a-pulse-signal-to-the-pcm-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-sends-a-pulse-signal-to-the-pcm-768x511.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-sends-a-pulse-signal-to-the-pcm-1536x1022.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-sends-a-pulse-signal-to-the-pcm-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-sends-a-pulse-signal-to-the-pcm-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-sends-a-pulse-signal-to-the-pcm.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The camshaft position sensor sends a pulse signal to the PCM once it determines that the no. 1 cylinder is in the top dead center position.<\/figcaption><\/figure>\n\n\n\n<p>Camshaft position sensors can be a Hall effect or magnetic reluctance sensor. Either way, they both react to the camshaft position.<\/p>\n\n\n\n<p>After measuring the exact rotational position of the <a href=\"https:\/\/www.carparts.com\/crankshaft\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"crankshaft\">crankshaft<\/a>, the camshaft position sensor sends a critical data signal that will let the PCM control the <a href=\"https:\/\/www.carparts.com\/fuel-injector\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel injectors\">fuel injectors<\/a> and <a href=\"https:\/\/www.carparts.com\/ignition-coil\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ignition coils\">ignition coils<\/a>, kickstarting the ignition sequence.<\/p>\n\n\n\n<p><strong><em>Note:<\/em><\/strong><em> The definition of code P0391 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of the P0391 Code?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/blog\/bad-camshaft-position-sensor-symptoms-diagnosis-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Camshaft position sensor failure\">Camshaft position sensor failure<\/a><\/li>\n\n\n\n<li>Wiring issues<\/li>\n\n\n\n<li>Broken tone ring<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Powertrain control module failure\">Powertrain control module failure<\/a> or software in need of an update<\/li>\n\n\n\n<li>A failure of the engine&rsquo;s timing chain or related components<\/li>\n<\/ul>\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\/set-repb311609-2_1\">\n  <\/div>\n  <div class=\"rsi-info\">\n    <span class=\"rsi-title\">The Best Camshaft Position Sensor Brands You Can Count On<\/span>\n    <span class=\"rsi-desc\">Check out the best camshaft position sensor brands known for delivering consistent fit, accurate signal output, and long-term dependability.<\/span>\n    <a href=\"https:\/\/www.carparts.com\/blog\/the-best-camshaft-position-sensor-brands-you-can-count-on-quickref\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Discover Your Options\">Discover Your Options<\/a>\n  <\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0391 Code?<\/h2>\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><\/li>\n\n\n\n<li>Poor engine performance<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Engine might not start\">Engine might not start<\/a><\/li>\n\n\n\n<li>Increased fuel consumption<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-shuts-off-while-driving-causes-what-to-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Stalling\">Stalling<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0391 Code<\/h2>\n\n\n\n<p>DTC P0391 is a generic powertrain code that can be logged in vehicles equipped with an OBD-II system. While this might be the case, keep in mind that the steps for diagnosis and repair can be affected by vehicle specifications.<\/p>\n\n\n\n<p>Diagnosing trouble codes like the P0391 usually involves using a scan tool and inspecting the affected system for signs of damage. If you think the job is too complicated for you, it&rsquo;s a great idea to have a certified mechanic diagnose your vehicle for you instead. Otherwise, you can do it yourself.<\/p>\n\n\n\n<p>To help you out, here&rsquo;s a short video that shows what the diagnostic process for a P0391 code usually involves.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/www.youtube.com\/watch?v=itMXO56z1tw&amp;t=39s\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0391 Code<\/h2>\n\n\n\n<p>It can be frustrating and confusing to try and resolve a P0391 code on your own&#19968;especially without the right tools and automotive know-how. If you&rsquo;re not confident with your DIY skills yet, you can always bring your vehicle to the nearest repair shop to have a trained professional perform the necessary repairs. This also ensures that all the steps and protocols for repairing this DTC are followed.<\/p>\n\n\n\n<p>But if you think you have what it takes to do the job on your own, keep in mind that there is no such thing as a magic bullet that will resolve the trouble code for all makes and models. So before you work on your vehicle, make sure to get the right repair manual. Guides like those from Chilton or an ALLDATA subscription contain vehicle-specific repair information, which will definitely come in handy when working on your daily driver.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fix the P0391 Code With a New Camshaft Position Sensor<\/h2>\n\n\n\n<p>Replacing the failed camshaft position sensor is a common fix to clear the P0391 code. When sensors fail, they need to be replaced as soon as possible. Otherwise, your vehicle&rsquo;s engine might develop more issues and eventually need more expensive repairs. Need a crankshaft position sensor? Look no further than CarParts.com.<\/p>\n\n\n\n<p>CarParts.com offers a wide selection of engine components and sensors that can fix code P0391. These include new PCMs, tone rings, and timing chains. We only source our products from established brands, so you can be confident that they&rsquo;ve met stringent quality control standards. We also have distribution centers in strategic locations throughout the US, so you can get new components quickly.<\/p>\n\n\n\n<p>Don&rsquo;t let faulty engine components lead to expensive repairs. Browse our selection of high-quality <a href=\"https:\/\/www.carparts.com\/crankshaft-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"crankshaft position sensors\">crankshaft position sensors<\/a> today!<\/p>\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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The powertrain control module (PCM) uses the information from the camshaft position sensor to determine the correct injection sequence. Typically&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0391-code-camshaft-position-sensor-b-circuit-range-performance-bank-2\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":77275,"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":[1464,1686,1183,1323,1185,1169],"ppma_author":[2607,2855],"class_list":{"0":"post-77269","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-camshaft-position-sensor","9":"tag-crankshaft","10":"tag-cylinder-head-2","11":"tag-engine-control-module-2","12":"tag-fuel-injector-2","13":"tag-ignition-coil-2","14":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0391 Code: Camshaft Position Sensor \u201cB\u201d Circuit Range\/Performance Bank 2 - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Here\u2019s the meaning behind a P0391 code as well as the most common causes and symptoms behind it.\" \/>\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\/p0391-code-camshaft-position-sensor-b-circuit-range-performance-bank-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0391 Code: Camshaft Position Sensor \u201cB\u201d Circuit Range\/Performance Bank 2 - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Here\u2019s the meaning behind a P0391 code as well as the most common causes and symptoms behind it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0391-code-camshaft-position-sensor-b-circuit-range-performance-bank-2\/\" \/>\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=\"2022-11-03T06:37:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-19T06:13:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/11\/camshaft-position-sensor-triggering-p0391-code.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1333\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team, William Guzenski, 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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0391-code-camshaft-position-sensor-b-circuit-range-performance-bank-2\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0391-code-camshaft-position-sensor-b-circuit-range-performance-bank-2\\\/\"},\"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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