{"id":1149,"date":"2019-08-22T15:10:37","date_gmt":"2019-08-22T19:10:37","guid":{"rendered":"https:\/\/www.solopcms.com\/blog\/?p=1149"},"modified":"2020-10-20T17:56:02","modified_gmt":"2020-10-20T21:56:02","slug":"7-common-pcm-failure-symptoms","status":"publish","type":"post","link":"https:\/\/www.solopcms.com\/blog\/7-common-pcm-failure-symptoms\/","title":{"rendered":"7 Common PCM Failure Symptoms"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Not too long ago, all of our cars\u2019 systems were manual. From timing to tire pressure, you had to keep an eye on every aspect of your vehicle, and it was routine for mechanics to give your car a \u201ctune-up\u201d along with your oil change.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ever wonder why that isn\u2019t necessary anymore?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The reason is your car\u2019s computer system. These systems are primarily controlled by a single computer: the powertrain control module (PCM). This controls the engine control module (ECM) and the transmission control module (TCM).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">While our modern, computerized vehicles are more reliable and efficient than older cars, these computers come with a disadvantage. When a computer fails, it can affect multiple aspects of the vehicle all at once.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here, we\u2019ll be looking at common PCM failure symptoms and what they mean for your car.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let\u2019s get started!<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">1. Your \u2018Check Engine\u2019 Light is On<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The Check Engine light is your car\u2019s catch-all light. It can stand for just about anything that isn\u2019t covered by one of your other car\u2019s warning lights, so there\u2019s no reason to panic just because it came on.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">That said, it means that <\/span><i><span style=\"font-weight: 400;\">something <\/span><\/i><span style=\"font-weight: 400;\">is wrong, so it\u2019s a good idea to have your engine codes read to ensure that nothing serious is going on. In addition, many states won\u2019t allow a car to pass an inspection if the Check Engine light is lit, which means you\u2019ll need to have it checked sooner or later regardless. Why not get it taken care of before there\u2019s an emergency?<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">2. Your Car Won\u2019t Start or Starts Roughly<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">If your car doesn\u2019t start or takes several attempts to get running, this could also be another PCM failure system. This can be caused by several different PCM errors, but may also be an indication of something wrong in your ECM.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Possible causes include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">An improperly-balanced fuel-to-air ratio<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Improper engine timing\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">A short in the wiring harness\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Regardless, this is a serious problem, since your car could potentially fail to start when you\u2019re stranded on a country road, in an empty parking lot, or any number of undesirable locations.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">3. Sudden Loss of Gas Mileage<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">One function of your PCM is to work with the ECM and TCM to control your fuel-to-air ratio and decide when to shift gears. If either of these functions isn\u2019t working optimally, your gas mileage will suffer.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Of course, there are other reasons for poor gas mileage as well. Check your tires to make sure they\u2019re properly inflated, and make sure your filters have all been replaced as scheduled. If these things are up to date, it\u2019s possible there\u2019s something wrong with your car\u2019s computer system.<\/span><\/p>\n<p><center><img decoding=\"async\" class=\"aligncenter size-large wp-image-1151\" src=\"https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/sebastian-huxley-LlaRJqMBvyc-unsplash-wecompress.com_-1024x576.jpg\" alt=\"pcm failure symptoms\" width=\"700\" height=\"394\" srcset=\"https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/sebastian-huxley-LlaRJqMBvyc-unsplash-wecompress.com_-1024x576.jpg 1024w, https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/sebastian-huxley-LlaRJqMBvyc-unsplash-wecompress.com_-300x169.jpg 300w, https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/sebastian-huxley-LlaRJqMBvyc-unsplash-wecompress.com_-768x432.jpg 768w, https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/sebastian-huxley-LlaRJqMBvyc-unsplash-wecompress.com_-460x260.jpg 460w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/center><\/p>\n<h2><span style=\"font-weight: 400;\">4. You Failed Your Emissions Test<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">As we\u2019ve mentioned, your vehicle\u2019s PCM and ECM control your fuel-to-air ratio. If the mixture is too rich (too much fuel compared to the amount of air), the fuel won\u2019t fully combust and will put out significantly more particles and carbon monoxide than a well-running engine.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This may cause you to fail your state\u2019s emissions test. If your car does fail, check your PCM and ECM first. Believe it or not, a failed PCM or PCM may actually be good news: replacing either of these systems is significantly cheaper than getting a new catalytic converter.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">5. Your Engine Stutters or Stalls<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Engine stuttering or stalling is a sign that there\u2019s either a serious mechanical problem or a failed computer system. Once again, if you\u2019re experiencing these symptoms, a PCM or ECM failure is actually one of the better-case scenarios in terms of cost and ease of repair.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This can happen for any number of reasons, but usually, it\u2019s a problem with your engine timing. While that function is directly controlled by the ECM, your PCM may also be at fault, since the ECM requires feedback from the PCM to adjust timing.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">6. Erratic or Random Shifting<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">One of the most serious PCM failure symptoms is irregular shifting. This generally happens because of a faulty sensor, or because water has damaged some of the circuits in your car\u2019s PCM or TCM.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If your automatic transmission vehicle isn\u2019t shifting normally, take it to a mechanic <\/span><i><span style=\"font-weight: 400;\">immediately<\/span><\/i><span style=\"font-weight: 400;\">. A failed PCM or TCM can cause the car to get stuck in gear, which can be a serious safety issue. It can also lead to costly transmission damage.<\/span><\/p>\n<p><center><img decoding=\"async\" class=\"aligncenter wp-image-1153 size-large\" src=\"https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/dylan-gillis-H_wwK683PXE-unsplash-wecompress.com_-1024x683.jpg\" alt=\"pcm failure symptoms\" width=\"700\" height=\"467\" srcset=\"https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/dylan-gillis-H_wwK683PXE-unsplash-wecompress.com_-1024x683.jpg 1024w, https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/dylan-gillis-H_wwK683PXE-unsplash-wecompress.com_-300x200.jpg 300w, https:\/\/www.solopcms.com\/blog\/wp-content\/uploads\/2019\/08\/dylan-gillis-H_wwK683PXE-unsplash-wecompress.com_-768x512.jpg 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/center><\/p>\n<h2><span style=\"font-weight: 400;\">7. You\u2019re Receiving a PCM-Related Error Code<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The last symptom on our list is the humble error code. When your PCM experiences a problem, it logs an error code, which will display on any connected code reader device. If this is your first sign of trouble, congratulations! You found the problem before it got any worse.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">We\u2019ve written about several of these codes in the past, including the\u00a0 <\/span><a href=\"https:\/\/www.solopcms.com\/blog\/common-causes-u0100-code-fix\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">U0100 code<\/span><\/a><span style=\"font-weight: 400;\">, the <\/span><a href=\"https:\/\/www.solopcms.com\/blog\/p0603-code-what-means-how-to-fix\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">P0603 code<\/span><\/a><span style=\"font-weight: 400;\">, the <\/span><a href=\"https:\/\/www.solopcms.com\/blog\/p0113-error-code\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">P0113 code<\/span><\/a><span style=\"font-weight: 400;\">, and the <\/span><a href=\"https:\/\/www.solopcms.com\/blog\/fix-p0606-fault-code\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">P0606 code<\/span><\/a><span style=\"font-weight: 400;\">. That said, our list is not exhaustive. Most codes beginning in \u201cP06\u201d involve a PCM failure, and there are some others as well. Consult your code reader\u2019s manual for specific information on any codes you\u2019re seeing.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">8. What to Do If You Experience PCM Failure Symptoms\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">If you\u2019re experiencing one of these PCM failure symptoms, don\u2019t panic. The problem may not be your PCM at all. It may be a faulty sensor or a shorted wire.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To find out more, we encourage you to look at some of the PCM repair guides we\u2019ve linked in the article. A good mechanic can also help you pinpoint the source of your problems.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If it turns out that you have to <\/span><a href=\"https:\/\/www.solopcms.com\/blog\/replacing-your-pcm\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">replace or repair<\/span><\/a><span style=\"font-weight: 400;\"> your PCM, <\/span><a href=\"https:\/\/www.solopcms.com\/contact-us\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">contact us<\/span><\/a><span style=\"font-weight: 400;\"> on our website, or call us at 888-848-0144. Our knowledgeable technicians specialize in PCM repair and replacement. They\u2019ll answer any questions you may have.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Not too long ago, all of our cars\u2019 systems were manual. From timing to tire pressure, you had to keep an eye on every aspect of your vehicle, and it was routine for mechanics to give your car a \u201ctune-up\u201d along with your oil change.\u00a0 Ever wonder why that isn\u2019t necessary anymore? The reason is&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1243,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[70],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>7 Symptoms of a Bad PCM - Solo Auto Electronics<\/title>\n<meta name=\"description\" content=\"PCM failure can show itself in different ways. We&#039;re helping you identify 7 common PCM failure symptoms and what they mean for your car.\" \/>\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\/7-common-pcm-failure-symptoms\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"7 Symptoms of a Bad PCM - Solo Auto Electronics\" \/>\n<meta property=\"og:description\" content=\"PCM failure can show itself in different ways. 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