{"id":1122,"date":"2019-07-09T15:00:59","date_gmt":"2019-07-09T19:00:59","guid":{"rendered":"https:\/\/www.solopcms.com\/blog\/?p=1122"},"modified":"2026-09-18T13:21:03","modified_gmt":"2026-09-18T17:21:03","slug":"p0603-code-what-means-how-to-fix","status":"publish","type":"post","link":"https:\/\/www.solopcms.com\/blog\/p0603-code-what-means-how-to-fix\/","title":{"rendered":"P0603 Code: What It Means and How to Fix It"},"content":{"rendered":"<span style=\"font-weight: 400;\">A <a href=\"https:\/\/www.solopcms.com\/auto-computers\/\" target=\"_blank\" rel=\"noopener\">P0603 code<\/a> is one of many universal error codes that your car may generate.<\/span>If you see this code on your code scanner, it could mean anything from the minor inconvenience of replacing your battery cables to serious powertrain problems like mistimed shifting.\n\nIn this article, we&#8217;ll discuss possible causes of the P0603 code, how to make a diagnosis, and how to repair your car.\n<h2>Tools Needed For Diagnosis and Repair<\/h2>\nBefore you begin diagnosing and repairing a P0603 code, make sure you have the following tools ready:\n<ul>\n \t<li>A flashlight or shop light for visibility<\/li>\n \t<li>A car battery charger<\/li>\n \t<li>A multimeter<\/li>\n \t<li>An OBD2 code scanner<\/li>\n<\/ul>\n<h2>What is the P0603 Code Meaning?<\/h2>\nThe P0603 code indicates that your Powertrain Control Module (PCM) has failed its own Keep Alive Memory (KAM) self-test. The PCM is a computer in your car that controls essential systems such as the ignition, engine timing, fuel\/air mixture, transmission, and anti-lock brakes.\n\nWhen a car is manufactured, the PCM is programmed with factory default settings for that model. However, these defaults aren&#8217;t always optimal. Depending on your vehicle&#8217;s individual quirks, typical road and weather conditions in your area, and your own driving habits, the PCM needs to make adjustments for optimal performance. It saves these adjustments in Keep Alive Memory.\n\nIf your PCM can&#8217;t retrieve these settings after several attempts, it generates a P0603 code.\n<h2>What Does the P0603 Code Mean For My Car?<\/h2>\nThe impact of the P0603 code on your car depends on the differences between your PCM&#8217;s factory default settings and the new settings it&#8217;s created. Older cars tend to require more adjustments as they age, leading to potentially more severe problems.\n\nThe most serious problems related to the P0603 code are with the fuel\/air mixture, engine timing, and transmission. Issues with the fuel\/air mixture can cause reduced fuel efficiency and emission test failures. Engine timing errors can result in unnecessary engine wear and tear. Faulty transmission settings can lead to inefficient or rough shifting.\n\n<center><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1123 size-large\" src=\"https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/07\/evan-hein-Vb8pR6cKCRI-unsplash-1024x683.webp\" alt=\"diagnosing p0603 code under the car bonnet\" width=\"700\" height=\"467\" \/><\/center>\n<h2>Common Causes of the P0603 Code<\/h2>\nSeveral factors can cause your PCM&#8217;s settings to fail to load. Here are the most common reasons:\n<ul>\n \t<li>Your KAM is not receiving sufficient power.<\/li>\n \t<li>The KAM or battery ground has shorted out.<\/li>\n \t<li>Your KAM module itself has failed.<\/li>\n<\/ul>\n<h2>Common Symptoms Associated With the P0603 Code<\/h2>\nIf your code scanner detects a P0603 code, you may or may not experience other symptoms, including:\n<ul>\n \t<li>Check engine light illumination<\/li>\n \t<li>Difficulty starting the engine<\/li>\n \t<li>Rough idling and acceleration<\/li>\n \t<li>Poorly-timed shifting<\/li>\n \t<li>Engine misfires<\/li>\n<\/ul>\nSome of these symptoms are similar to what you&#8217;ll see in a car with a <a href=\"https:\/\/www.solopcms.com\/blog\/transmission-control-module-tcm\/\">failed Transmission Control Module (TCM)<\/a>, so diagnosing based on symptoms alone can be difficult. This is why it&#8217;s so important to use a code scanner.\n<h2>What Does Diagnosing the P0603 Code Entail?<\/h2>\nThere are a few steps involved in fixing a P0603 code. We&#8217;ll start with the easiest ones and work from there.\n\n<center><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1125 size-large\" src=\"https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/07\/neonbrand-2K_-PG95qlI-unsplash-1024x683.webp\" alt=\"what is a P0603 Code\" width=\"700\" height=\"467\" \/><\/center>\n<ol>\n \t<li><strong>Check Your Battery<\/strong>: Use a multimeter to check your battery&#8217;s voltage. If it&#8217;s low (below 14 volts at idle or below 12 volts with the engine off), connect a car battery charger to recharge it. Reset the codes and drive normally for a few days. If the code reappears, consider replacing your battery or alternator.<\/li>\n \t<li><strong>Inspect Contacts and Ground Connections<\/strong>: Examine your battery contacts for moisture, corrosion, dirt, or other factors that might disrupt the electrical flow. Clean them thoroughly. Also, test all connections to and from the battery, including ground connections from your PCM and battery. Replace any damaged wires.<\/li>\n \t<li><strong>Reset Codes and Test<\/strong>: After addressing potential issues, reset the error codes using your OBD2 scanner. Take your vehicle for a test drive under normal conditions and monitor the scanner for any recurrence of the P0603 code.<\/li>\n<\/ol>\nIf these steps don&#8217;t resolve the issue, you may need to consider replacing your PCM. Refer to our PCM replacement guide for more detailed instructions.\n<h2>Common Mistakes When Diagnosing the Issue<\/h2>\n<ul>\n \t<li>\u2013 Failing to check idle voltage and ground connections<\/li>\n<\/ul>\n<h2>Possible Solutions For Fixing the P0603 Code<\/h2>\n<ul>\n \t<li>\u2013 Try Replacing your battery or alternator<\/li>\n \t<li>\u2013 Replacing failed PCM or battery grounds<\/li>\n \t<li>\u2013 Consider Replacing your PCM<\/li>\n<\/ul>\n<h2>Repair Steps for Code P0603<\/h2>\nRepairing a P0603 code can be a systematic process involving several steps. In this section, we&#8217;ll outline the essential repair steps you should follow to resolve this engine error code.\n<h4>Step 1: <strong>Battery Voltage Check<\/strong><\/h4>\nStart by using a multimeter to check the voltage of your vehicle&#8217;s battery. If the voltage is below the specified levels (typically below 14 volts at idle or below 12 volts with the engine off), it&#8217;s essential to address this issue first. Proper battery voltage is critical for the PCM&#8217;s operation.\n<h4>Step 2: <strong>Inspect Battery Cables and Ground Connections<\/strong><\/h4>\nThoroughly inspect the condition of your battery cables and ground connections. Look for signs of moisture, corrosion, dirt, or damage. Clean any corroded terminals or connections. Faulty cables or poor ground connections can disrupt power supply to the PCM.\n<h4>Step 3: <strong>Diagnose Sensor Inputs<\/strong><\/h4>\nUse your OBD2 code scanner to diagnose the sensor inputs. Pay close attention to sensors like the oxygen sensor, throttle position sensor, and mass airflow sensor. Ensure they are providing accurate readings and replace any faulty sensors if necessary.\n<h4>Step 4: <strong>Reset Codes and Test Drive<\/strong><\/h4>\nAfter addressing any issues identified during the diagnosis, reset the error codes using your OBD2 scanner. Then, take your vehicle for a test drive under normal conditions. Monitor the scanner for any reoccurrence of the P0603 code. If it reappears, further investigation may be required.\n<h2>Warning Lights and Symptoms<\/h2>\nWarning lights and symptoms associated with a P0603 code can vary, and it&#8217;s essential to be vigilant about these indicators. Here are some warning lights and symptoms that may accompany a P0603 fault code:\n<ul>\n \t<li><strong>Check Engine Light<\/strong>: The most common warning is the illumination of the check engine light on your dashboard.<\/li>\n \t<li><strong>Difficulty Starting<\/strong>: You may experience difficulty starting your engine or prolonged cranking times.<\/li>\n \t<li><strong>Rough Idling and Acceleration<\/strong>: Rough idling and poor acceleration can be symptoms of a P0603 code, as the PCM struggles to adjust engine parameters correctly.<\/li>\n \t<li><strong>Misfires<\/strong>: Engine misfires can occur due to incorrect fuel\/air mixture or timing, which may result from a faulty PCM.<\/li>\n \t<li><strong>Badly-Timed Shifting<\/strong>: In vehicles with automatic transmissions, you may notice erratic or poorly timed shifting, leading to a less-than-smooth driving experience.<\/li>\n<\/ul>\n<h2>How Can We Help?<\/h2>\nIf worse comes to worst and you need to replace or repair your PCM, <a href=\"https:\/\/www.solopcms.com\/contact-us\/\">contact us<\/a> on our website, or call us at 888-848-0144. Our knowledgeable technicians are specialists in PCMs, and can answer any questions you may have about this or other common issues and common codes.\n\n<!-- solo-schema:faq:start -->\n\n<div class=\"solo-cta solo-cta-b\" data-cta=\"B\"><strong>Not a DIY fix?<\/strong> <a class=\"solo-cta-link\" data-cta-target=\"repair\" href=\"https:\/\/www.solopcms.com\/auto-computer-repair\/\">Solo can test and rebuild your original computer<\/a>, or set you up with a replacement for your vehicle.<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What does a P0603 code mean?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">P0603 means the engine computer&rsquo;s keep-alive memory (KAM) has failed &mdash; the memory that stores learned settings lost power or couldn&rsquo;t hold its data.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What causes a P0603 code?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Common causes are a weak or disconnected battery, poor grounds or corroded connectors, a blown memory-circuit fuse, or an internal PCM fault.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can I drive with a P0603 code?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Usually short-term, but the engine may run rough or idle poorly while the computer relearns, and a recurring P0603 can point to a failing module.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How do I fix a P0603 code?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check the battery, grounds, and the keep-alive memory fuse and wiring first. If power is solid and the code returns, the PCM\/ECM likely has an internal fault.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does a P0603 code mean my PCM is bad?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It can. After ruling out battery, grounds, and fuses, a persistent P0603 usually means the module&rsquo;s memory circuit has failed and the PCM needs testing or replacement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can replacing the PCM fix a P0603 code?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes &mdash; when the internal memory fault is confirmed, a tested and programmed replacement PCM\/ECM resolves it.<\/p>\n\n<!-- solo-schema:faq:end -->\n\n\n<!-- solo-schema:faqld:start -->\n<script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [\n  {\n   \"@type\": \"Question\",\n   \"name\": \"What does a P0603 code mean?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"P0603 means the engine computer's keep-alive memory (KAM) has failed - the memory that stores learned settings lost power or couldn't hold its data.\"\n   }\n  },\n  {\n   \"@type\": \"Question\",\n   \"name\": \"What causes a P0603 code?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"Common causes are a weak or disconnected battery, poor grounds or corroded connectors, a blown memory-circuit fuse, or an internal PCM fault.\"\n   }\n  },\n  {\n   \"@type\": \"Question\",\n   \"name\": \"Can I drive with a P0603 code?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"Usually short-term, but the engine may run rough or idle poorly while the computer relearns, and a recurring P0603 can point to a failing module.\"\n   }\n  },\n  {\n   \"@type\": \"Question\",\n   \"name\": \"How do I fix a P0603 code?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"Check the battery, grounds, and the keep-alive memory fuse and wiring first. If power is solid and the code returns, the PCM\/ECM likely has an internal fault.\"\n   }\n  },\n  {\n   \"@type\": \"Question\",\n   \"name\": \"Does a P0603 code mean my PCM is bad?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"It can. After ruling out battery, grounds, and fuses, a persistent P0603 usually means the module's memory circuit has failed and the PCM needs testing or replacement.\"\n   }\n  },\n  {\n   \"@type\": \"Question\",\n   \"name\": \"Can replacing the PCM fix a P0603 code?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"Yes - when the internal memory fault is confirmed, a tested and programmed replacement PCM\/ECM resolves it.\"\n   }\n  }\n ]\n}\n<\/script>\n<!-- solo-schema:faqld:end -->\n\n\n\n<div class=\"solo-cta solo-cta-a\" data-cta=\"A\"><strong class=\"solo-cta__title\">A code like this often traces back to a failing PCM, ECM or ECU.<\/strong><p class=\"solo-cta__body\">If yours needs replacing, Solo ships a tested, plug-in-ready computer for your exact vehicle. 12-month warranty, lifetime available.<\/p><p class=\"solo-cta__actions\"><a class=\"solo-cta-link solo-cta__btn solo-cta__btn--primary\" data-cta-target=\"shop\" href=\"https:\/\/www.solopcms.com\/auto-computers\/\">Shop your vehicle&rsquo;s computer<\/a><a class=\"solo-cta-link solo-cta__btn solo-cta__btn--ghost\" data-cta-target=\"repair\" href=\"https:\/\/www.solopcms.com\/auto-computer-repair\/\">Send yours in for repair<\/a><\/p><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>A P0603 code is one of many universal error codes that your car may generate.If you see this code on your code scanner, it could mean anything from the minor inconvenience of replacing your battery cables to serious powertrain problems like mistimed shifting. In this article, we&#8217;ll discuss possible causes of the P0603 code, how&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1124,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"p0603 code","_yoast_wpseo_title":"P0603 Code: Causes, Symptoms & How to Fix It (KAM Error)","_yoast_wpseo_metadesc":"P0603 means the PCM&rsquo;s keep-alive memory (KAM) failed, often after a battery issue. Learn what a P0603 code means, its causes, and how to fix it.","_solo_cta_blocks":"[{\"v\": \"b\", \"targets\": [\"repair\"]}, {\"v\": \"a\", \"targets\": [\"shop\", \"repair\"], \"c\": \"code\"}]","footnotes":""},"categories":[2],"tags":[],"class_list":["post-1122","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-auto-computer-info"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>P0603 Code: Causes, Symptoms &amp; How to Fix It (KAM Error)<\/title>\n<meta name=\"description\" content=\"P0603 means the PCM&rsquo;s keep-alive memory (KAM) failed, often after a battery issue. Learn what a P0603 code means, its causes, and how to fix 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.solopcms.com\/blog\/p0603-code-what-means-how-to-fix\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0603 Code: Causes, Symptoms &amp; How to Fix It (KAM Error)\" \/>\n<meta property=\"og:description\" content=\"P0603 means the PCM&rsquo;s keep-alive memory (KAM) failed, often after a battery issue. 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