{"id":519599,"date":"2025-12-11T13:29:47","date_gmt":"2025-12-11T18:29:47","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0667-lost-communication-engine-oil-temperature-sensor\/"},"modified":"2025-12-11T13:29:47","modified_gmt":"2025-12-11T18:29:47","slug":"dtc-u0667-lost-communication-engine-oil-temperature-sensor","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0667-lost-communication-engine-oil-temperature-sensor\/","title":{"rendered":"U0667 Code Symptoms, Causes, Diagnostic Steps &#038; Cost Estimate Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">U0667<\/div>\n<h1>U0667 Code Symptoms, Causes, Diagnostic Steps &amp; Cost Estimate Guide<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>U0667 = Lost communication with Engine Oil Temperature Sensor A. <\/li>\n<li>Typical warning: \u201cEngine Oil Temp\u201d lamp or generic communication fault indicator. <\/li>\n<li>Most common causes: sensor wiring\/connectors, sensor failure, ECU communication fault, or outdated software. <\/li>\n<li>Diagnosis starts with a scan, wiring continuity test, and bidirectional ECU communication check. <\/li>\n<li>Module replacement (ECU\/PCM) usually costs $600\u2011$900 + $200\u2011$300 labor; Flagship One provides VIN\u2011matched, pre\u2011programmed units. <\/li>\n<\/ul>\n<\/div>\n<h3>U0667 Code \u2013 Symptoms, Causes, and How to Repair It <\/h3>\n<p>Drivers first notice a warning light or erratic temperature gauge when the engine oil temperature sensor stops reporting data. The instrument cluster may flash an \u201cEngine Oil Temperature\u201d warning, illuminate a generic communication fault lamp, or, on some vehicles, trigger a limp\u2011mode that limits power to protect the engine. Because the ECU cannot receive oil\u2011temperature information, protective strategies such as fuel\u2011trim adjustments or automatic shutdown may engage. These symptoms appear almost immediately after the loss of communication and persist until the fault is cleared.<\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Engine Oil Temperature warning lamp<\/strong> illuminated continuously or intermittently. <\/li>\n<li><strong>Temperature gauge<\/strong> jumps to extreme hot or cold readings, often \u201c\u2011\u2011\u2011\u201d or \u201c0 \u00b0F\/\u00b0C\u201d. <\/li>\n<li><strong>Generic communication fault indicator<\/strong> (often a yellow exclamation mark) on the dash. <\/li>\n<li><strong>Reduced engine\u2011protection functions<\/strong> \u2013 the ECU may limit torque or enter limp\u2011mode. <\/li>\n<li><strong>Loss of oil\u2011temperature\u2011based diagnostics<\/strong> \u2013 the vehicle may not log oil\u2011temp data for service scans.<\/li>\n<\/ul>\n<h2>Why This Happens <\/h2>\n<h3>Faulty Engine Oil Temperature Sensor A <\/h3>\n<p>The sensor contains a thermistor that converts oil temperature to an electrical signal. Internal failure (open circuit, shorted thermistor) prevents the sensor from transmitting data. While a bad sensor can trigger U0667, the ECU must still be able to request and receive information; a sensor that simply does not respond will appear as a communication loss.<\/p>\n<h3>Wiring Harness Damage or Connector Corrosion <\/h3>\n<p>The sensor\u2019s signal travels through a dedicated wire pair and a connector that is exposed to engine heat and oil splatter. Corroded pins, broken conductors, or water intrusion can interrupt the signal path, causing the ECU to register a loss of communication.<\/p>\n<h3>ECU\/PCM Communication Fault <\/h3>\n<p>The ECU\u2019s communication module (CAN, LIN, or proprietary bus) may develop internal faults\u2014damaged transceiver, burned\u2011out driver, or memory corruption\u2014that prevent it from interpreting incoming sensor data. When the ECU cannot process the sensor\u2019s message, it logs U0667 even though the sensor and wiring are intact.<\/p>\n<h3>Software or Calibration Issues <\/h3>\n<p>Out\u2011of\u2011date ECU firmware may contain bugs that misinterpret sensor data or fail to retry communication after a brief glitch. A recent software update often resolves such intermittent faults by improving error\u2011handling routines.<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Scan for Codes<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a dealer\u2011level or high\u2011quality OBD\u2011II scanner. Record U0667 and any related codes (e.g., U0100 \u201cLost Communication With ECM\/PCM\u201d). <\/p>\n<ol>\n<li><strong>Verify Power and Ground at the Sensor<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Using a multimeter, check that the sensor\u2019s supply voltage (typically 5 V) and ground are present while the ignition is ON. Absence of voltage indicates a wiring break or fuse issue. <\/p>\n<ol>\n<li><strong>Test Wiring Continuity<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Disconnect the sensor connector. Measure resistance between the sensor pins and the ECU harness pins. Open circuits or resistance far outside the manufacturer\u2019s specification point to damaged wire or corroded pins. <\/p>\n<ol>\n<li><strong>Bidirectional ECU Communication Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; With a diagnostic tool that supports bidirectional control, command the ECU to request a temperature reading. Observe whether the ECU receives a valid response. No response confirms a communication failure beyond the sensor. <\/p>\n<ol>\n<li><strong>Inspect and Clean Connectors<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Remove any oil, carbon, or corrosion from the sensor connector and ECU harness. Use contact\u2011cleaner spray and a soft brush. Re\u2011torque the connector to the manufacturer\u2019s spec (usually 4\u20116 Nm). <\/p>\n<ol>\n<li><strong>Reprogram\/Update ECU Software<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the ECU firmware is older than the latest release, apply the update using the manufacturer\u2019s flash tool. This step resolves known bugs that cause false U0667 triggers. <\/p>\n<ol>\n<li><strong>Replace the Engine Oil Temperature Sensor (if needed)<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; After confirming that wiring and ECU communication are sound, install a new sensor. Verify operation with a live data readout\u2014oil temperature should now track accurately. <\/p>\n<ol>\n<li><strong>Repair or Replace the ECU\/PCM<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When the ECU fails the bidirectional test despite good wiring and sensor, the module itself is likely defective. <\/p>\n<p> &#8211; <strong>Repair<\/strong>: Some shops can re\u2011solder damaged traces or replace internal components, but success rates vary. <\/p>\n<p> &#8211; <strong>Replacement<\/strong>: Install a VIN\u2011matched replacement unit, have it programmed with the vehicle\u2019s calibration data, and perform a final communication verification. <\/p>\n<p><strong>Cost Estimate<\/strong> <\/p>\n<ul>\n<li>Wiring\/connector repair: $50\u2011$150 (parts and labor). <\/li>\n<li>Sensor replacement: $30\u2011$80 for the part; $100\u2011$150 labor. <\/li>\n<li>ECU software update: $80\u2011$120 labor. <\/li>\n<li>ECU repair (if available): $200\u2011$400. <\/li>\n<li>ECU replacement (VIN\u2011matched, pre\u2011programmed): $600\u2011$900 + $200\u2011$300 labor. <\/li>\n<\/ul>\n<h2>When Replacement Makes More Sense Than Repair <\/h2>\n<div class=\"flagship-logo-section\">\n<a href=\"https:\/\/www.fs1inc.com\/\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<img decoding=\"async\" alt=\"Flagship One\" class=\"flagship-logo\" src=\"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg\"\/><br \/>\n<\/a>\n<\/div>\n<p>Repeated communication failures often stem from internal damage to the ECU\u2019s communication circuitry. While a repair can restore function temporarily, moisture ingress, burnt traces, or corrupted memory typically re\u2011appear after a short interval, leading to recurring U0667 events. When diagnostic data shows persistent ECU\u2011side faults after wiring and sensor verification, replacement eliminates the root cause and restores long\u2011term reliability.<\/p>\n<p><strong>Flagship One<\/strong> specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive replacement that is pre\u2011programmed to your vehicle\u2019s exact specifications. Their units incorporate the latest firmware, come with a comprehensive warranty, and are shipped ready for installation, removing the need for dealer\u2011only re\u2011coding. Choosing a Flagship One replacement ensures proper security integration, eliminates communication errors, and reduces vehicle downtime.<\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Inspect sensor connectors<\/strong> every 12 months or at each oil change. Remove oil splatter and apply dielectric grease to guard against corrosion. <\/li>\n<li><strong>Route wiring away from heat sources<\/strong>; use heat\u2011shield sleeves where the harness passes near the exhaust or turbocharger. <\/li>\n<li><strong>Maintain proper oil level and quality<\/strong>. Over\u2011filling or using oil with excessive additives can foul the sensor tip, leading to erratic signals. <\/li>\n<li><strong>Schedule ECU software updates<\/strong> during regular service intervals. Manufacturers release calibration patches that improve sensor communication handling. <\/li>\n<li><strong>Use OEM\u2011approved diagnostic tools<\/strong> for any re\u2011programming or calibration work to avoid introducing communication mismatches.<\/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>\n","protected":false},"excerpt":{"rendered":"<p>Engine temp warning on your vehicle? Lost communication with Engine Oil Temperature Sensor A can cause overheating\u2014scan, test wiring, replace sensor.<\/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-519599","post","type-post","status-publish","format-standard","hentry","category-auto-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>U0667 Code Symptoms, Causes, Diagnostic Steps &amp; Cost Estimate 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-u0667-lost-communication-engine-oil-temperature-sensor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0667 Code Symptoms, Causes, Diagnostic Steps &amp; Cost Estimate Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Engine temp warning on your vehicle? 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