{"id":75856,"date":"2022-10-16T16:08:30","date_gmt":"2022-10-16T23:08:30","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=75856"},"modified":"2023-08-30T01:17:56","modified_gmt":"2023-08-30T08:17:56","slug":"p0aa6-code-hybrid-battery-voltage-system-isolation-fault","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0aa6-code-hybrid-battery-voltage-system-isolation-fault\/","title":{"rendered":"P0AA6 Code: Hybrid Battery Voltage System Isolation Fault"},"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\"> 2<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_48d0ec-71 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_48d0ec-71 > .kt-inside-inner-col,.kadence-column_48d0ec-71 > .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_48d0ec-71 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_48d0ec-71 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_48d0ec-71 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_48d0ec-71 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_48d0ec-71{position:relative;}@media all and (max-width: 1024px){.kadence-column_48d0ec-71 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_48d0ec-71 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_48d0ec-71 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-053817  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-e29968\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_2edbbc-ae, .wp-block-kadence-advancedheading.kt-adv-heading_2edbbc-ae[data-kb-block=\"kb-adv-heading_2edbbc-ae\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_2edbbc-ae mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_2edbbc-ae[data-kb-block=\"kb-adv-heading_2edbbc-ae\"] 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_2edbbc-ae img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_2edbbc-ae[data-kb-block=\"kb-adv-heading_2edbbc-ae\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_2edbbc-ae summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_2edbbc-ae\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>DTC P0AA6 stands for &ldquo;Hybrid Battery Voltage System Isolation Fault&rdquo;<\/li><li>This code is logged when the PCM detects an isolation fault in the high-voltage system.<\/li><li>Possible causes include issues with the high-voltage battery and\/or cables, as well as problems with the battery control module.<\/li><li>Common symptoms include lit warning lights, a battery that doesn&rsquo;t charge, and vehicle startup issues.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p><a href=\"http:\/\/carparts.com\/ev\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"Electric vehicles\">Electric vehicles<\/a> (EVs) have a low-voltage (LV) system and a high-voltage (HV) system. To prevent electrical issues and accidents during maintenance and repair, manufacturers deliberately separate the HV system from its low-voltage counterpart and the frame of the EV.<\/p>\n\n\n\n<p>If the <a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"PCM\">PCM<\/a> detects an isolation fault in the high-voltage system of the hybrid EV, its diagnostics will log a P0AA6 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0AA6 Code Mean?<\/h2>\n\n\n\n<p>The <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) P0AA6 indicates &ldquo;Hybrid Battery Voltage System Isolation Fault.&rdquo; It applies to electric vehicles, especially models with hybrid powertrains.<\/p>\n\n\n\n<p>In both hybrid and all-electric vehicles, the high-voltage system is mounted on the body or chassis. It is a floating system&ndash;while its components are attached to the chassis, they do not rely on the chassis to electrically ground themselves.<\/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\/2022\/10\/electric-vehicle-cutaway-model-1024x642.jpg\" alt=\"electric vehicle cutaway model\" class=\"wp-image-75861\" width=\"1024\" height=\"642\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/electric-vehicle-cutaway-model-1024x642.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/electric-vehicle-cutaway-model-300x188.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/electric-vehicle-cutaway-model-768x482.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/electric-vehicle-cutaway-model-1536x963.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/electric-vehicle-cutaway-model-150x94.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/electric-vehicle-cutaway-model.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>In both hybrid and all-electric vehicles, the high-voltage system is mounted on the body or chassis.<\/figcaption><\/figure>\n\n\n\n<p>Manufacturers design their EVs with a minimum level of resistance&ndash;also called electrical isolation&ndash; between the high-voltage system and the vehicle&rsquo;s chassis.<\/p>\n\n\n\n<p>If the high-voltage system wasn&rsquo;t electrically isolated from the rest of the vehicle, its powerful current could make the vehicle unsafe.<\/p>\n\n\n\n<p>The PCM regularly checks the high-voltage system. If it detects an isolation fault, it will set the generic code P0AA6.<\/p>\n\n\n\n<p><strong>Note:<\/strong> The definition of code P0AA6 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Causes of a Code P0AA6?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>A fault with the high-voltage battery<\/li><li>Issues with the high-voltage cables<\/li><li>A problem with the high-voltage electronics or control system (e.g., a shorted traction motor, failed system main relay, faulty high-voltage A\/C compressor, etc.)<\/li><li>An issue with the battery control module<\/li><\/ul>\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 Common Symptoms of a Code P0AA6?<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Illuminated warning lights<\/li><li>High-voltage system stops working properly<\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/my-car-battery-wont-hold-a-charge-what-do-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Battery fails to charge\">Battery fails to charge<\/a><\/li><li><a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Vehicle won&rsquo;t start\">Vehicle won&rsquo;t start<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0AA6 Code<\/h2>\n\n\n\n<p>Many vehicle makes and models can log a P0AA6 code. However, the exact circumstances that trigger the generic code can vary between vehicles. A diagnostic process that works in one case can fail to find any problem in another vehicle.<\/p>\n\n\n\n<p>Bring your vehicle to a professional mechanic for a diagnostic test if you cannot do it yourself. Otherwise, you can go ahead and evaluate the issue yourself. To help you get started, here is a video that can give you an idea of what the process might involve:<\/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=\"Hybrid High Voltage Short Circuit, Isolation Fault or Leak Procedure\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/7KfjAPxEyng?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 P0AA6 Code<\/h2>\n\n\n\n<p>Trying to clear a P0AA6 code can prove difficult if you lack the tools and know-how to test the high-voltage system. In most cases, it&rsquo;s best to leave the job to professionals. If you are a DIYer with enough technical knowledge and hands-on experience who can test and replace your vehicle&rsquo;s high-voltage system, it&rsquo;s a good idea to refer to the vehicle&rsquo;s <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or an online repair database\">repair manual or an online repair database<\/a>.<\/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\"> 2<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Electric vehicles (EVs) have a low-voltage (LV) system and a high-voltage (HV) system. To prevent electrical issues and accidents during&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0aa6-code-hybrid-battery-voltage-system-isolation-fault\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":75862,"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":[1323],"ppma_author":[2607,2855],"class_list":{"0":"post-75856","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-engine-control-module-2","9":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0AA6 Code: Hybrid Battery Voltage System Isolation Fault - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what a P0AA6 code means, the possible causes, and the common symptoms associated with 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\/p0aa6-code-hybrid-battery-voltage-system-isolation-fault\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0AA6 Code: Hybrid Battery Voltage System Isolation Fault - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what a P0AA6 code means, the possible causes, and the common symptoms associated with this code.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0aa6-code-hybrid-battery-voltage-system-isolation-fault\/\" \/>\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:published_time\" content=\"2022-10-16T23:08:30+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-30T08:17:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/10\/ev-model-charging-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1152\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\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\\\/p0aa6-code-hybrid-battery-voltage-system-isolation-fault\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0aa6-code-hybrid-battery-voltage-system-isolation-fault\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"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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