{"id":79463,"date":"2025-06-16T13:49:50","date_gmt":"2025-06-16T18:49:50","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=79463"},"modified":"2025-06-16T13:49:50","modified_gmt":"2025-06-16T18:49:50","slug":"p2138-obd2-throttle-pedal-position-sensor-switch-d-e-voltage-correlation","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p2138-obd2-throttle-pedal-position-sensor-switch-d-e-voltage-correlation","title":{"rendered":"P2138 OBD2: Throttle\/Pedal Position Sensor\/Switch &#8220;D&#8221;\/&#8221;E&#8221; Voltage Correlation"},"content":{"rendered":"<p>The P2138 code is a diagnostic trouble code (DTC) that pertains to an issue with the throttle and pedal position sensors in your vehicle. These sensors are crucial components that communicate the driver&#8217;s acceleration intentions to the engine control module (PCM).<\/p>\n<h2>What Does the P2138 Code Mean?<\/h2>\n<p>OBD-II Code P2138 is defined as a Throttle\/Pedal Position Sensor\/Switch &#8220;D&#8221;\/&#8221;E&#8221; Voltage Correlation. This code indicates that there is a discrepancy in the voltage readings between the throttle position sensor and the pedal position sensor, which could lead to improper engine performance.<\/p>\n<h2>What Causes the P2138 Code?<\/h2>\n<p>The P2138 code can be triggered by several issues, including:<\/p>\n<ul>\n<li>Accelerator Pedal Position (APP) assembly failure<\/li>\n<li>Throttle Position Sensor (TPS) failure<\/li>\n<li>Powertrain Control Module (PCM) failure<\/li>\n<li>Wiring issues or poor connections<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P2138 Code?<\/h2>\n<p>Drivers experiencing the P2138 code may notice the following symptoms:<\/p>\n<ul>\n<li>Decreased engine performance<\/li>\n<li>Engine may enter limp home mode, which limits speed and performance<\/li>\n<\/ul>\n<h2>How Serious Is the P2138 Code?<\/h2>\n<p>The P2138 code is classified as urgent. It indicates a significant malfunction that could lead to severe engine damage or safety risks for the driver and passengers. Immediate action is recommended to prevent further complications.<\/p>\n<h2>How to Diagnose the P2138 Code<\/h2>\n<p>To diagnose the P2138 code effectively, a mechanic should follow these steps:<\/p>\n<ol>\n<li>Use an OBD-II scanner to confirm the P2138 code and check for any accompanying codes.<\/li>\n<li>Inspect the wiring and connectors for the throttle and pedal position sensors for damage or corrosion.<\/li>\n<li>Test the voltage output of the throttle position sensor and pedal position sensor.<\/li>\n<li>Check the functionality of the APP and TPS assemblies.<\/li>\n<li>Evaluate the PCM for any faults.<\/li>\n<\/ol>\n<h2>Common Repairs for the P2138 Code<\/h2>\n<p>Common repairs for the P2138 code include:<\/p>\n<ul>\n<li>Replacing the Accelerator Pedal Position (APP) assembly<\/li>\n<li>Replacing the Throttle Position Sensor (TPS)<\/li>\n<li>Repairing or replacing damaged wiring and connectors<\/li>\n<li>Replacing the Powertrain Control Module (PCM) if necessary<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P2138 Code?<\/h2>\n<p>The cost to fix the P2138 code can vary widely based on the underlying issue. Potential costs may range from $100 to $1,500, depending on whether a sensor needs replacing or a more complex repair involving the PCM is required.<\/p>\n<h2>Can I Fix the P2138 Code Myself?<\/h2>\n<p>While some skilled DIY enthusiasts may be able to diagnose and fix the P2138 code by following the diagnostic steps and repairing wiring or replacing sensors, this code often indicates a problem that may require professional expertise. It is recommended to consult a qualified mechanic if you are unsure or if the issue persists after your efforts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P2138 code is a diagnostic trouble code (DTC) that pertains to an issue with the throttle and pedal position sensors in your vehicle. These sensors are crucial components that communicate the driver&#8217;s acceleration intentions to the engine control module (PCM). What Does the P2138 Code Mean? OBD-II Code P2138 is defined as a Throttle\/Pedal &hellip;<\/p>\n","protected":false},"author":26,"featured_media":88804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[11987],"tags":[],"class_list":["post-79463","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-p-obd2-codes-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OBD2 Code P2138 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P2138 code, what causes throttle\/pedal position sensor voltage correlation issues, and how to diagnose and fix common issues to maintain optimal engine performance.\" \/>\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.emanualonline.com\/blog\/p2138-obd2-throttle-pedal-position-sensor-switch-d-e-voltage-correlation\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2138 OBD2: Throttle\/Pedal Position Sensor\/Switch &quot;D&quot;\/&quot;E&quot; Voltage Correlation\" \/>\n<meta property=\"og:description\" content=\"The P2138 code is a diagnostic trouble code (DTC) that pertains to an issue with the throttle and pedal position sensors in your vehicle. These sensors\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p2138-obd2-throttle-pedal-position-sensor-switch-d-e-voltage-correlation\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/jee514\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-16T18:49:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/06\/p2138-obd2-throttlepedal-position-sensorswitch-de-voltage-correlation.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"JC Landry\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:site\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"JC Landry\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p2138-obd2-throttle-pedal-position-sensor-switch-d-e-voltage-correlation#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/p2138-obd2-throttle-pedal-position-sensor-switch-d-e-voltage-correlation\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\\\/\\\/www.emanualonline.com\\\/blog\\\/#\\\/schema\\\/person\\\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P2138 OBD2: Throttle\\\/Pedal Position Sensor\\\/Switch &#8220;D&#8221;\\\/&#8221;E&#8221; 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These sensors are crucial components that communicate the driver&#8217;s acceleration intentions to the engine control module (PCM). What Does the P2138 Code Mean? 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