{"id":519619,"date":"2025-12-11T13:54:58","date_gmt":"2025-12-11T18:54:58","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0687-lost-communication-catalyst-temperature-bank-2-sensor-2\/"},"modified":"2025-12-11T13:54:58","modified_gmt":"2025-12-11T18:54:58","slug":"dtc-u0687-lost-communication-catalyst-temperature-bank-2-sensor-2","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0687-lost-communication-catalyst-temperature-bank-2-sensor-2\/","title":{"rendered":"U0687 Code Symptoms, Diagnosis Process, Causes &#038; Repair Costs"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">U0687<\/div>\n<h1>U0687 Code Symptoms, Diagnosis Process, Causes &amp; Repair Costs<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>U0687 means the PCM has lost communication with the Bank 2, Sensor 2 catalyst\u2011temperature sensor. <\/li>\n<li>Typical driver\u2011visible signs are a check\u2011engine light, reduced fuel economy, rough idle, and limited power. <\/li>\n<li>Primary causes are wiring\/connectors, sensor failure, or PCM communication\/software faults. <\/li>\n<li>Diagnosis requires a scan tool, wiring continuity check, sensor voltage test, and PCM communication verification. <\/li>\n<li>Replacement of the PCM (or re\u2011programming) is often more reliable than repeated sensor\u2011level repairs; Flagship One supplies VIN\u2011matched, pre\u2011programmed modules. <\/li>\n<\/ul>\n<\/div>\n<p>Drivers first notice a sudden illumination of the check\u2011engine light, followed by a drop in fuel\u2011economy numbers on the trip computer. The idle may become uneven, and the vehicle can feel hesitant when the accelerator is pressed, especially under load. In some cases the power\u2011output warning appears, limiting acceleration until the fault clears. These observations are the most common ways the U0687 fault presents itself, prompting a scan for diagnostic trouble codes.<\/p>\n<h2>Symptoms<\/h2>\n<ul>\n<li><strong>Check\u2011engine light (CEL) on<\/strong> \u2013 the PCM stores the U0687 code and may set related emission\u2011monitor failures. <\/li>\n<li><strong>Reduced fuel economy<\/strong> \u2013 the engine control strategy reverts to a conservative map, using more fuel to protect the catalytic system. <\/li>\n<li><strong>Rough or unstable idle<\/strong> \u2013 without accurate catalyst\u2011temperature data the PCM cannot fine\u2011tune fuel trim at low load. <\/li>\n<li><strong>Limited power or \u201c limp\u2011mode\u201d behavior<\/strong> \u2013 the PCM may restrict throttle opening to prevent overheating of the catalyst. <\/li>\n<\/ul>\n<p>Because the fault concerns a sensor that monitors exhaust temperature, the vehicle\u2019s emissions system may also fail an inspection, even if drivability seems acceptable.<\/p>\n<h2>Why This Happens<\/h2>\n<h3>Faulty Wiring or Corroded Connectors<\/h3>\n<p>The catalyst\u2011temperature sensor on Bank 2, Sensor 2 is located downstream of the exhaust manifold. Heat, vibration, and exposure to coolant can degrade the harness. A broken wire, high\u2011resistance splice, or corrosion on the sensor\u2019s connector interrupts the PCM\u2019s data stream, triggering U0687.<\/p>\n<h3>Sensor Failure<\/h3>\n<p>The sensor itself is a thermistor that changes resistance with temperature. Internal element cracks or electrolyte loss produce an open\u2011circuit condition. While the sensor can be replaced, the PCM may still register a communication loss if the underlying circuit is compromised.<\/p>\n<h3>PCM Communication Circuit Fault<\/h3>\n<p>Inside the PCM, the analog\u2011to\u2011digital converter that reads the sensor may develop a fault due to moisture ingress or solder joint fatigue. The PCM then cannot interpret the voltage, even though the sensor and wiring are sound.<\/p>\n<h3>Software or Calibration Issues<\/h3>\n<p>Factory updates sometimes modify the way the PCM interprets catalyst\u2011temperature signals. A missing or corrupted calibration file can cause the PCM to reject valid sensor data, storing U0687 until the software is refreshed.<\/p>\n<h2>Diagnostic and Repair Procedures<\/h2>\n<ol>\n<li><strong>Retrieve the Code<\/strong>\n<\/li>\n<\/ol>\n<p> Connect a manufacturer\u2011specific scan tool and confirm the presence of U0687. Note any accompanying codes (e.g., P0420) that may indicate broader catalyst concerns.<\/p>\n<ol>\n<li><strong>Visual Inspection of Wiring<\/strong>\n<\/li>\n<\/ol>\n<p> Locate the Bank 2, Sensor 2 harness. Look for cracked insulation, burnt spots, or loose connector clips. Repair or replace damaged sections before proceeding.<\/p>\n<ol>\n<li><strong>Continuity Test<\/strong>\n<\/li>\n<\/ol>\n<p> With the ignition off, measure resistance between the sensor\u2019s signal wire and ground. A reading of \u201copen\u201d (infinite resistance) points to a wiring break or sensor short.<\/p>\n<ol>\n<li><strong>Sensor Voltage Test<\/strong>\n<\/li>\n<\/ol>\n<p> Back\u2011probe the sensor while the engine is at operating temperature (\u2248 600 \u00b0F). The voltage should rise proportionally with temperature, typically 0.5\u20134.5 V. No change indicates sensor failure.<\/p>\n<ol>\n<li><strong>PCM Pin\u2011out Verification<\/strong>\n<\/li>\n<\/ol>\n<p> Using a multimeter, check the PCM\u2019s sensor input pin for proper voltage reference (usually 5 V) and signal presence. Absence of reference voltage suggests a PCM\u2011side fault.<\/p>\n<ol>\n<li><strong>Communication Test<\/strong>\n<\/li>\n<\/ol>\n<p> Some scan tools can perform a \u201cmodule communication\u201d check. A failure indicates that the PCM\u2019s internal circuitry or its CAN\u2011bus interface is not responding to the sensor request.<\/p>\n<ol>\n<li><strong>Re\u2011program the PCM<\/strong>\n<\/li>\n<\/ol>\n<p> If wiring and sensor are functional, update the PCM software to the latest manufacturer calibration. This step often clears U0687 when the cause is a corrupted map.<\/p>\n<ol>\n<li><strong>Replace the PCM (if necessary)<\/strong>\n<\/li>\n<\/ol>\n<p> When the PCM pin\u2011out test or communication test fails after wiring and sensor verification, replacement is the most reliable remedy. Ensure the new unit is programmed to the vehicle\u2019s VIN and calibrated for the specific engine configuration.<\/p>\n<p><strong>Cost Estimates<\/strong> <\/p>\n<ul>\n<li>Wiring repair: $80\u2011$150 for parts and labor. <\/li>\n<li>Sensor replacement (if chosen): $120\u2011$250 plus labor. <\/li>\n<li>PCM re\u2011programming: $100\u2011$180 for a dealer\u2011level flash. <\/li>\n<li>PCM replacement (including VIN\u2011matched programming): $800\u2011$1,200 for the module plus $200\u2011$300 labor.<\/li>\n<\/ul>\n<h2>When Replacement Makes Sense<\/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 attempts to repair wiring or sensor issues can become costly and may not restore reliable communication if the PCM\u2019s internal circuitry is compromised. A damaged PCM often exhibits intermittent faults that reappear after short drives, leading to recurring check\u2011engine lights and possible emissions\u2011test failures. In such cases, swapping the module and having it correctly programmed eliminates the root cause rather than treating symptoms.<\/p>\n<p><strong>Flagship One<\/strong> specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by a comprehensive warranty. Modern control modules are complex and integrated with security and immobilizer systems. That\u2019s why choosing a replacement isn\u2019t only about the hardware\u2014it\u2019s about correct programming and compatibility. Flagship One supplies modules that are pre\u2011programmed to your vehicle\u2019s specifications, ensuring seamless integration and eliminating the need for dealer\u2011only re\u2011flashing.<\/p>\n<h2>Preventive Maintenance<\/h2>\n<ul>\n<li><strong>Inspect connectors every 30 000 mi<\/strong> \u2013 look for moisture, corrosion, or loose pins. A quick spray of dielectric grease can protect against future oxidation. <\/li>\n<li><strong>Keep the exhaust system free of coolant leaks<\/strong> \u2013 coolant dripping onto the sensor harness can cause short circuits. <\/li>\n<li><strong>Schedule PCM software updates<\/strong> \u2013 manufacturers release calibration refinements that improve sensor interpretation; applying them during routine service prevents communication glitches. <\/li>\n<li><strong>Avoid extreme heat exposure<\/strong> \u2013 when possible, park in shaded areas to reduce thermal cycling on the sensor wiring. <\/li>\n<li><strong>Use a quality OBD\u2011II scanner<\/strong> \u2013 periodic live\u2011data monitoring of catalyst\u2011temperature readings can catch a drifting sensor before it fails completely.<\/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>Lost catalyst temp from Bank 2 Sensor 2 on the vehicle? It can cause emissions failure and stop inspection\u2014scan, test wiring, then reprogram or replace it.<\/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-519619","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>U0687 Code Symptoms, Diagnosis Process, Causes &amp; Repair Costs - 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-u0687-lost-communication-catalyst-temperature-bank-2-sensor-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0687 Code Symptoms, Diagnosis Process, Causes &amp; Repair Costs - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Lost catalyst temp from Bank 2 Sensor 2 on the vehicle? 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