{"id":519552,"date":"2025-12-11T12:45:19","date_gmt":"2025-12-11T17:45:19","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0620-lost-communication-exhaust-gas-temperature-sensor-bank-1-sensor-2\/"},"modified":"2025-12-11T12:45:19","modified_gmt":"2025-12-11T17:45:19","slug":"dtc-u0620-lost-communication-exhaust-gas-temperature-sensor-bank-1-sensor-2","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0620-lost-communication-exhaust-gas-temperature-sensor-bank-1-sensor-2\/","title":{"rendered":"U0620 Code Symptoms, Causes, Diagnosis &#038; Repair Overview Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">U0620<\/div>\n<h1>U0620 Code Symptoms, Causes, Diagnosis &amp; Repair Overview Guide<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>U0620 means the power\u2011train control module (PCM\/ECU) has lost communication with the Exhaust Gas Temperature (EGT) sensor Bank 1, Sensor 2. <\/li>\n<li>Drivers usually see the MIL (check\u2011engine light) on, reduced power, or a limp\u2011mode restriction. <\/li>\n<li>Common causes are wiring faults, connector corrosion, PCM communication failure, or a completely failed EGT sensor. <\/li>\n<li>Diagnosis starts with a live scan, wiring continuity checks, and a PCM communication test; re\u2011programming or module replacement may be required. <\/li>\n<li>Preventive care focuses on protecting wiring harnesses, keeping connectors clean, and using proper diagnostic tools. <\/li>\n<\/ul>\n<\/div>\n<h3>U0620 Code Symptoms and Warning Signs <\/h3>\n<p>Drivers typically notice one or more of the following after the U0620 code appears: <\/p>\n<ul>\n<li><strong>MIL illumination<\/strong> \u2013 the check\u2011engine light stays on and may be accompanied by a \u201cservice engine\u201d message. <\/li>\n<li><strong>Power loss or limp\u2011mode<\/strong> \u2013 the PCM reduces throttle response, limits RPM, or forces the vehicle into a protective low\u2011power mode to prevent overheating of the exhaust system. <\/li>\n<li><strong>Exhaust\u2011temperature\u2011related warnings<\/strong> \u2013 some models display a \u201cexhaust temperature high\u201d or \u201cengine protection\u201d alert on the instrument cluster. <\/li>\n<li><strong>Reduced fuel\u2011efficiency<\/strong> \u2013 because the PCM can no longer rely on accurate EGT data, it may run a richer mixture, leading to a noticeable drop in MPG. <\/li>\n<\/ul>\n<p>These signs appear suddenly and persist until the communication fault is resolved.<\/p>\n<h3>Why Communication With Bank 1 Sensor 2 Fails <\/h3>\n<h4>1. Wiring Harness Damage <\/h4>\n<p>Physical damage to the harness that carries the EGT signal (abrasion, heat exposure, or rodent chewing) creates an open circuit or intermittent resistance. The PCM interprets the loss as a sensor failure and logs U0620.<\/p>\n<h4>2. Corroded or Loose Connectors <\/h4>\n<p>Moisture ingress, brake\u2011dust buildup, or improper tightening can corrode the sensor\u2019s connector pins. Even a small increase in contact resistance disrupts the high\u2011frequency data stream required for temperature monitoring.<\/p>\n<h4>3. PCM Communication Fault <\/h4>\n<p>The PCM\u2019s internal communication bus (CAN or LIN) may suffer from a failed transceiver, firmware corruption, or a solder\u2011joint fracture. When the bus can\u2019t acknowledge the sensor\u2019s signal, the module logs a lost\u2011communication code.<\/p>\n<h4>4. Faulty EGT Sensor (Bank 1, Sensor 2) <\/h4>\n<p>A sensor that has shorted internally or lost its internal reference can stop transmitting any data. While the sensor itself is a hardware part, the PCM\u2019s inability to recover communication still triggers U0620.<\/p>\n<h4>5. Software or Calibration Mismatch <\/h4>\n<p>After a major ECU flash, a software version that does not support the specific sensor configuration can cause the PCM to reject incoming data, resulting in a communication loss.<\/p>\n<h3>Diagnostic and Repair Procedures <\/h3>\n<ol>\n<li><strong>Read and Freeze\u2011Frame Data<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a professional scan tool, retrieve the U0620 code, and note any accompanying codes (e.g., P0455, C1234). Freeze\u2011frame parameters often show the engine load and temperature at the time of the fault, confirming whether the PCM was actively protecting the exhaust.<\/p>\n<ol>\n<li><strong>Live Data Stream<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; With the engine running, monitor the EGT sensor\u2019s voltage or temperature reading. A flat line at 0 \u00b0C or a constant high value indicates no valid data. Compare Bank 1 Sensor 2 with Bank 1 Sensor 1; a discrepancy suggests a wiring or sensor issue.<\/p>\n<ol>\n<li><strong>Wiring Continuity and Resistance Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Disconnect the sensor connector and perform a 2\u2011wire continuity check from the PCM pin to the sensor harness. Resistance should be within the manufacturer\u2019s specification (typically &lt; 1 \u03a9). Any open circuit or high resistance points to harness damage.<\/p>\n<ol>\n<li><strong>Connector Inspection<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Visually examine the connector for corrosion, bent pins, or broken clips. Clean with an electrical contact cleaner and re\u2011torque to the specified torque (usually 5\u20137 Nm). Re\u2011test live data after cleaning.<\/p>\n<ol>\n<li><strong>PCM Communication Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Use a scan tool that can perform a \u201cPCM communication test\u201d or \u201cCAN bus integrity check.\u201d The tool sends a request to the PCM and verifies the response. Failure indicates a PCM\u2011level fault rather than a sensor or wiring problem.<\/p>\n<ol>\n<li><strong>Re\u2011programming \/ Calibration<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the PCM passes hardware tests but the code persists, update the PCM firmware to the latest version and re\u2011calibrate the EGT sensor parameters. Many manufacturers require a specific calibration routine after a PCM flash.<\/p>\n<ol>\n<li><strong>Module Repair or Replacement<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When the PCM\u2019s internal transceiver or bus driver is identified as defective, a repair may be possible with a certified re\u2011soldering service. However, repeated communication failures often make replacement the more reliable long\u2011term solution.<\/p>\n<p><strong>Cost Estimates<\/strong> <\/p>\n<ul>\n<li>Professional scan and live\u2011data session: $80\u2011$120. <\/li>\n<li>Wiring harness repair (if needed): $150\u2011$300 labor plus $30\u2011$80 parts. <\/li>\n<li>PCM re\u2011programming: $120\u2011$200. <\/li>\n<li>PCM replacement (including VIN\u2011matched unit and programming): $1,200\u2011$1,800 plus $150\u2011$250 labor.<\/li>\n<\/ul>\n<h3>When Replacement Makes More Sense Than Repair <\/h3>\n<p>Modern control modules are complex, integrating power\u2011train control, emissions monitoring, and vehicle\u2011security functions. When a PCM\u2019s communication circuitry fails, a simple repair often provides only a temporary fix; the underlying board damage or firmware incompatibility can quickly re\u2011appear. <\/p>\n<p><strong>Flagship One specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by a comprehensive warranty.<\/strong> Because each unit is pre\u2011programmed to your vehicle\u2019s exact specifications, installation eliminates the need for on\u2011site coding and reduces the risk of post\u2011repair failures. When diagnostic results point to a PCM communication fault that cannot be resolved through re\u2011programming or wiring repair, a Flagship One replacement ensures reliable, long\u2011term operation.<\/p>\n<h3>Preventive Maintenance <\/h3>\n<ul>\n<li><strong>Protect Wiring Harnesses<\/strong> \u2013 Route heat shields away from exhaust components, and use conduit or protective sleeves in high\u2011temperature zones. <\/li>\n<li><strong>Regular Connector Care<\/strong> \u2013 During scheduled service, inspect the EGT sensor connectors for moisture or debris; clean and reseal as needed. <\/li>\n<li><strong>Software Updates<\/strong> \u2013 Keep the PCM firmware current; manufacturers release updates that improve sensor communication protocols and address known bugs. <\/li>\n<li><strong>Avoid After\u2011Market Modifications<\/strong> \u2013 Non\u2011OEM tuning or sensor swaps can introduce mismatched communication parameters, increasing the likelihood of U0620. <\/li>\n<li><strong>Scheduled Diagnostic Scans<\/strong> \u2013 A yearly OBD\u2011II scan catches emerging communication issues before the MIL illuminates, allowing early wiring or software correction.<\/li>\n<\/ul>\n<div class=\"info-section\">\n<p><strong>Service Recommendation:<\/strong> Most issues related to this fault are diagnosed and corrected through inspection, wiring repair, and calibration rather than module replacement. For modules not typically replaced through aftermarket suppliers, diagnosis and repair should be performed by a certified automotive technician with access to factory service information and tooling.<\/p>\n<\/div>\n<div class=\"content-section\">\n<h2>Frequently Asked Questions<\/h2>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>No exhaust temp signal from Bank 1 Sensor 2 on your vehicle? It can trigger protection and emissions errors\u2014scan, check wiring, and reprogram\/replace unit.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-519552","post","type-post","status-publish","format-standard","hentry","category-auto-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>U0620 Code Symptoms, Causes, Diagnosis &amp; Repair Overview Guide - Flagship One Blog<\/title>\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.fs1inc.com\/blog\/dtc-u0620-lost-communication-exhaust-gas-temperature-sensor-bank-1-sensor-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0620 Code Symptoms, Causes, Diagnosis &amp; Repair Overview Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"No exhaust temp signal from Bank 1 Sensor 2 on your vehicle? 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