{"id":90509,"date":"2023-09-11T15:25:23","date_gmt":"2023-09-11T22:25:23","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=90509"},"modified":"2025-05-23T10:10:37","modified_gmt":"2025-05-23T17:10:37","slug":"what-does-service-4wd-mean-triggers-how-to-clear-and-more","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/what-does-service-4wd-mean-triggers-how-to-clear-and-more\/","title":{"rendered":"What Does Service 4WD Mean? Triggers, How to Clear, and More"},"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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column90509_0f7980-f2 > .kt-inside-inner-col,.kadence-column90509_0f7980-f2 > .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-column90509_0f7980-f2 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column90509_0f7980-f2 > .kt-inside-inner-col{flex-direction:column;}.kadence-column90509_0f7980-f2 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column90509_0f7980-f2 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column90509_0f7980-f2{position:relative;}@media all and (max-width: 1024px){.kadence-column90509_0f7980-f2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column90509_0f7980-f2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column90509_0f7980-f2 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-5b382d  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-f3bb73\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading90509_6041fc-f0, .wp-block-kadence-advancedheading.kt-adv-heading90509_6041fc-f0[data-kb-block=\"kb-adv-heading90509_6041fc-f0\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading90509_6041fc-f0 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading90509_6041fc-f0[data-kb-block=\"kb-adv-heading90509_6041fc-f0\"] 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-heading90509_6041fc-f0 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading90509_6041fc-f0[data-kb-block=\"kb-adv-heading90509_6041fc-f0\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading90509_6041fc-f0 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading90509_6041fc-f0\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The service 4WD message or light appears when there&rsquo;s a possible issue in the 4WD system that may require immediate attention.<\/li>\n\n\n\n<li>The most common culprit is an incomplete shift in gears. Other possible causes include electrical or sensor problems and a malfunctioning or overheated transfer case.<\/li>\n\n\n\n<li>Your vehicle will still move even with the service 4WD light on. However, disregarding the warning could lead to transmission issues and damage to the all-wheel drive system.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The Service 4WD message or light appears when there&rsquo;s a possible issue in the <a href=\"https:\/\/www.carparts.com\/blog\/a-crash-course-on-4wd-systems\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"4WD system\">4WD system<\/a> that may require immediate attention. In this article, we&rsquo;ll do a quick overview of what the Service 4WD message means and give drivers who are new to auto repair an idea of what clearing this warning light might entail.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Triggers the Service 4WD Message?<\/h2>\n\n\n\n<p><strong>Several issues can trigger the service 4WD message. The most common culprit is an incomplete shift in gears. Other possible causes include electrical or sensor problems and a malfunctioning or overheated transfer case.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Incomplete Shift in Gears<\/h3>\n\n\n\n<p>An incomplete shift in gears may trigger the 4WD service light to flash. This typically happens when you switch from <a href=\"https:\/\/www.carparts.com\/blog\/4x2-vs-4x4-whats-the-difference-and-which-is-better\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"2WD to 4WD\">2WD to 4WD<\/a> while the vehicle is still in motion, preventing the gears from fully engaging.<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/transfer-case\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transfer case\">transfer case<\/a> transfers power from the transmission to the axles via the drive shaft. An overheated case will have difficulties transferring the needed power, triggering the message.<\/p>\n\n\n\n    <div class=\"ai-summary-widget\">\n\n        <div class=\"ai-summary-grid\">\n\n            <div>\n                <div class=\"ai-avatar\">\n                    <figure>\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/ai-summary\/ai-bot\" alt=\"AI robot\">\n                    <\/figure>\n                    <span>ELI5<\/span>\n                <\/div>\n            <\/div>\n            <div>\n                <p>The Service 4WD message means something might be wrong with the car&rsquo;s four-wheel drive. Four-wheel drive helps the car drive better in snow, mud, or on rough roads. When this message shows up, the system needs to be checked or fixed. The car can still move, but it may not handle tricky roads as well.<\/p>    \n            <\/div>\n\n        <\/div>\n\n        <div class=\"ai-summary-tooltip\">   \n            <p>Not everyone is an auto repair expert. <strong>ELI5 (&ldquo;Explain Like I&rsquo;m Five&rdquo;)<\/strong> provides layperson-friendly explanations of complex automotive concepts, systems, &amp; parts, so you can fully understand their importance. Great for casual car owners and DIY beginners! Powered by AI.<\/p>\n        <\/div>\n\n    <\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Wiring, Electrical, or Sensor Problems<\/h3>\n\n\n\n<p>Since modern vehicles are made up of complex interwoven cables and mechanical parts, damaged wiring is one of the most common causes of the service 4WD message.<\/p>\n\n\n\n<p>These wiring issues can often be traced back to the transfer case control module (TCCM). Some of the common fault codes stored within the TCCM are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>P1867<\/strong>: Transmission Transfer Case Contact Plate General Circuit Failure<\/li>\n\n\n\n<li><strong>P1875<\/strong>: Transmission Automatic Hall Effect Sensor Power Circuit Short To Battery \/ 4WD Low Switch Circuit Electrical<\/li>\n\n\n\n<li><strong>P1860<\/strong>: TCC PWM Solenoid Circuit Electrical \/ Transmission Transfer Case Contact Plate &lsquo;D&rsquo; Short Circuit To Battery<\/li>\n\n\n\n<li><strong>P1887<\/strong>: 4-Wheel Drive Control Solenoid Circuit Failure<\/li>\n<\/ul>\n\n\n\n<p>In addition, the 4WD system has different sensors to help operate the system efficiently. Some of these sensors include the wheel speed sensor, <a href=\"https:\/\/www.carparts.com\/automatic-transmission-speed-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission speed sensor\">transmission speed sensor<\/a>, and <a href=\"https:\/\/www.carparts.com\/throttle-position-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"throttle position sensor\">throttle position sensor<\/a>.<\/p>\n\n\n\n<p>The wheel speed sensor detects the speed of the wheel and provides that information to the <a href=\"https:\/\/www.carparts.com\/blog\/what-is-abs-how-does-it-work\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"anti-lock braking system\">anti-lock braking system<\/a> (ABS). This system prevents the wheel from skidding due to loss of control.<\/p>\n\n\n\n<p>Meanwhile, the transmission speed sensor measures how fast the input and output shafts of the transmission are spinning.<\/p>\n\n\n\n<p>And lastly, the throttle position sensor measures how open the throttle valve is and controls the air that flows into the engine intake manifold. The manifold will then supply the proper air and fuel ratio to the cylinders to generate power.<\/p>\n\n\n\n<p>The Service 4WD message flashes if any of these sensors isn&rsquo;t working properly or is sending a reading outside the normal range. Corrosion and exposure to the elements are two common reasons for any damage or malfunction.<\/p>\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<h3 class=\"wp-block-heading\">Worn-out Components<\/h3>\n\n\n\n<p>Some vehicles (mainly older ones) use <a href=\"https:\/\/www.carparts.com\/locking-hub\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"locking hubs\">locking hubs<\/a> to disconnect the front wheels from the front <a href=\"https:\/\/www.carparts.com\/driveshaft\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"driveshaft\">driveshaft<\/a>. Similarly, modern car models have advanced electronics, such as the anti-lock braking system, to apply the brakes to skidding wheels.<\/p>\n\n\n\n<p>Damage to either of these two supporting components may trigger the service 4WD message. The damage to locking hubs is often due to mud and rust buildup.<\/p>\n\n\n\n<p>Meanwhile, the ABS may malfunction when metal shavings are attracted to the magnet wheel sensors. The shavings may come from the on-car-lathe, a machine used for resurfacing brake discs or rotors. It is not, however, a common phenomenon.<\/p>\n\n\n\n<p>Another component that works with the 4WD system is the differential axles. They let your wheels rotate at different speeds. Damage to even one of these axles could compromise the entire system.<\/p>\n\n\n\n<p>The easiest and most avoidable way of damaging the axles is by staying away from mud and water. The vent tube of the axle may suck up the water, which can lead to a failing <a href=\"https:\/\/www.carparts.com\/differential\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"differential\">differential<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Low\/Contaminated Fuel Level<\/h2>\n\n\n\n<p>Driving in four-wheel-drive mode uses more fuel. As such, low fuel levels or contaminated fuel may occasionally trigger the message.<\/p>\n\n\n\n<p>In this case, you can simply refill your <a href=\"https:\/\/www.carparts.com\/fuel-tank\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"gas tank\">gas tank<\/a> to clear the code. Since the message could stem from more than one issue, it&rsquo;s best to also check for other symptoms.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Clear the Service 4WD Message<\/h2>\n\n\n\n<p>Each manufacturer may have different procedures for clearing this warning light. Therefore, it&rsquo;s best to research vehicle-specific information before making any attempts at troubleshooting your ride.<\/p>\n\n\n\n<p>However, there are two simple steps you can do at home to try to clear the message:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Check the Owner&rsquo;s Manual<\/h3>\n\n\n\n<p>The owner&rsquo;s manual should have information about what to do if the Service 4WD message is illuminating. Always refer to yours before attempting to diagnose or fix your vehicle.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Engage and Inspect the 4WD system<\/h3>\n\n\n\n<p>Engage the 4WD system to see if it&rsquo;s engaging when activated. This step is also a way to check if the message was a false alarm. If not, then the issue may lie elsewhere.<\/p>\n\n\n\n<p>It&rsquo;s best to leave the more complicated repairs to a professional. Here&rsquo;s an overview of what a mechanic might do to clear this service message:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Visual Inspection<\/h3>\n\n\n\n<p>A visual inspection is performed to check if there is any visible damage to the vehicle that might cause the code.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Disconnect the Battery and TCCM<\/h3>\n\n\n\n<p>Disconnect the <a href=\"https:\/\/www.carparts.com\/battery\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"battery\">battery<\/a> to reset the onboard system to see if that clears the message.<\/p>\n\n\n\n<p>Before doing this, the engine must be switched off. Remove the negative cable from the battery terminal using a wrench, and wait for anywhere between 15 minutes to an hour before reconnecting the cable.<\/p>\n\n\n\n<p>If it doesn&rsquo;t, try unplugging the transfer case control module directly in an attempt to reset the system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5: Remove the Knee Bolster and Dash Bezel<\/h3>\n\n\n\n<p>The knee bolster is a component located under the steering column, while the dash bezel is the piece surrounding the gauges and instrument cluster on the 4&times;4 dashboard.<\/p>\n\n\n\n<p>These two need to be removed to check the switches and wires of electrical components for any damage, which could be triggering the warning light.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 6: Check the Transfer Case and Transfer Case Control Module<\/h3>\n\n\n\n<p>Check the transfer case for fluids, leaks, &nbsp;the hubs, and the linkage between the case and the 4WD control lever. Look at the <a href=\"https:\/\/www.carparts.com\/fuse-box\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuse box\">fuse box<\/a> to see if any fuse needs replacement.<\/p>\n\n\n\n<p>If the warning message wasn&rsquo;t triggered by an electrical problem, the next step is to check the transfer case control module. This component facilitates the power distribution to the front and rear axles in a 4WD system. It also collects input from switches as well as readings from various sensors.<\/p>\n\n\n\n<p>Use a diagnostic scanner to read and resolve any of the codes that show up. Afterward, the control module is tested by commanding it to engage and disengage the transfer case while monitoring the system&rsquo;s response. In some cases, the TCCM may need to be replaced.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 7: Check the 4WD Control Module<\/h3>\n\n\n\n<p>If the transfer case and TCCM are in good shape, check the 4WD control module next. This step may only apply to some vehicles, as some models have 4WD control modules that are also the TCCM.<\/p>\n\n\n\n<p>First, inspect the 4WD system for any physical damage or loose wiring. Scan the system for codes and resolve any that show up. Afterward, check the module&rsquo;s power supply by testing the voltage and resistance of the wiring and connections using a multimeter.<\/p>\n\n\n\n<p>If everything is clear, the module&rsquo;s outputs and inputs are tested using a diagnostic scan tool, multimeter, or oscilloscope. Lastly, the system is tested by engaging and disengaging it while it&rsquo;s monitored.<\/p>\n\n\n\n<p>Once your mechanic is done checking the control module, they&rsquo;ll reinstall all the knee bolster and dash panels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 8: Perform a System Reset<\/h3>\n\n\n\n<p>The last thing to do is to check if the Service 4WD light\/message disappeared. If it&rsquo;s still present, they may need to reset the 4WD system and other control modules. In some cases, they&rsquo;ll even reset the onboard computer.<\/p>\n\n\n\n    <div class=\"perspective-widget\">\n        <div class=\"pt-child-wrap\">\n\n            <div class=\"pt-col-item1\">\n                <figure class=\"aligncenter size-large\">\n                        <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/dpr_auto,f_auto,q_auto\/carparts\/blog\/plugins\/amp\/avatar-comments\" class=\"com-thumb\" alt=\"Avatar of CarParts.com Research Team\" width=\"100\" height=\"100\">\n                <\/figure>\n                <p>\n                    <strong>Muhammad Ali<\/strong> \n                    <span>User<\/span>\n                <\/p>\n            <\/div>\n\n            <div class=\"pt-col-item2\">\n                <div class=\"protip-desc\">\n                    <div class=\"perspective-help-tip\">   \n                        <p>There&rsquo;s more than one way to look at an issue. &ldquo;Community Perspectives&rdquo; highlight authentic personal viewpoints and real-life experiences by the CarParts.com community, including our readers, experts, and product specialists, among others. This can help you make better informed decisions about your car.<\/p>\n                    <\/div>\n                    <div class=\"perspective-help-caption tooltip\"> \n                        <h2>CarParts.com Community Perspectives<\/h2>\n                        <p>Very useful and complete knowledgeable information. I have the same problem with my Toyota RAV4 CV and am planning to fix it based on the instruction provided\/reviewed by Anthony Harlin. I much appreciate these valuable comments with recommending to those who have such issues.<\/p>\n                        <div class=\"cta-btn\">\n                            <a href=\"https:\/\/www.carparts.com\/blog\/what-does-service-4wd-mean-triggers-how-to-clear-and-more\/#commentform\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Jump to Discussions\">Jump to Discussions<\/a>\n                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n        <\/div>\n    <\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Can I Still Drive With the Service 4WD Light On?<\/h2>\n\n\n\n<p><strong>Your vehicle will still move even if the service 4WD light is on. However, it could lead to transmission issues and damage to the all-wheel drive system.<\/strong> In any case, it&rsquo;s best to take your vehicle to a mechanic as soon as possible.<\/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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The Service 4WD message or light appears when there&rsquo;s a possible issue in the 4WD system that may require immediate&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/what-does-service-4wd-mean-triggers-how-to-clear-and-more\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":91559,"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":[52,3751],"tags":[3615,3821,1679,1550],"ppma_author":[2607,3742],"class_list":{"0":"post-90509","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-warning-lights","9":"tag-automatic-transmission-speed-sensor","10":"tag-locking-hub","11":"tag-throttle-position-sensor","12":"tag-transfer-case","13":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Does Service 4WD Mean? Triggers, How to Clear, and More - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out what service 4WD means, what triggers the light, how to clear it, and more in this comprehensive article.\" \/>\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\/what-does-service-4wd-mean-triggers-how-to-clear-and-more\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Does Service 4WD Mean? Triggers, How to Clear, and More - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out what service 4WD means, what triggers the light, how to clear it, and more in this comprehensive article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/what-does-service-4wd-mean-triggers-how-to-clear-and-more\/\" \/>\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=\"2023-09-11T22:25:23+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-23T17:10:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/service-4wd-light-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1366\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team, Anthony Harlin, 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=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/what-does-service-4wd-mean-triggers-how-to-clear-and-more\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/what-does-service-4wd-mean-triggers-how-to-clear-and-more\\\/\"},\"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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