{"id":519603,"date":"2025-12-11T13:36:51","date_gmt":"2025-12-11T18:36:51","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0671-lost-communication-fuel-temperature-sensor-b\/"},"modified":"2025-12-11T13:36:51","modified_gmt":"2025-12-11T18:36:51","slug":"dtc-u0671-lost-communication-fuel-temperature-sensor-b","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0671-lost-communication-fuel-temperature-sensor-b\/","title":{"rendered":"U0671 Code Symptoms, Causes, Diagnosis and Repair Guide Steps"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">U0671<\/div>\n<h1>U0671 Code Symptoms, Causes, Diagnosis and Repair Guide Steps<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>**Code definition:** U0671 \u2013 Lost communication with Fuel Temperature Sensor B. <\/li>\n<li>**Typical driver cue:** Check\u2011engine light illuminated; may notice rough idle, hesitation on acceleration, or a drop in fuel\u2011economy. <\/li>\n<li>**Root causes:** Faulty wiring or connector, PCM internal fault, sensor\u2011circuit interference, or outdated PCM software. <\/li>\n<li>**First\u2011step diagnosis:** Scan with a PCM\u2011compatible scanner, perform a communication test, and inspect the sensor circuit. <\/li>\n<li>**Repair path:** Repair wiring or re\u2011program the PCM; replace the PCM only when communication cannot be restored. <\/li>\n<li>**Flagship One:** Provides VIN\u2011matched, pre\u2011programmed PCM replacements with warranty coverage.<\/li>\n<\/ul>\n<\/div>\n<h3>U0671 Code Symptoms and Solutions \u2013 How to Diagnose and Repair the Issue<\/h3>\n<p>When the Powertrain Control Module (PCM) can no longer talk to Fuel Temperature Sensor B, the engine\u2011control strategy loses a key data point. Drivers typically see the check\u2011engine light come on and may experience a rough idle, hesitation when the throttle is applied, or a measurable decline in miles\u2011per\u2011gallon because the PCM is forced to use default fuel\u2011temperature assumptions. These signs appear early enough that a timely scan can prevent more serious drivability loss.<\/p>\n<h2>Symptoms<\/h2>\n<ul>\n<li><strong>Check\u2011engine illumination<\/strong> \u2013 the MIL (malfunction indicator lamp) flashes or stays solid as soon as the PCM detects a loss of sensor data. <\/li>\n<li><strong>Rough idle<\/strong> \u2013 engine speed wavers between 600\u2013800 rpm under no\u2011load conditions. <\/li>\n<li><strong>Hesitation on acceleration<\/strong> \u2013 a brief lag of 0.5\u20131 second before the engine responds to throttle input. <\/li>\n<li><strong>Reduced fuel efficiency<\/strong> \u2013 fuel\u2011consumption numbers can drop 5\u201110 % because the PCM defaults to a richer mixture. <\/li>\n<\/ul>\n<p>These symptoms are directly tied to the PCM\u2019s inability to read accurate fuel\u2011temperature information, which influences ignition timing, fuel\u2011injection pulse width, and emissions control.<\/p>\n<h2>Why Communication Fails<\/h2>\n<h3>Faulty Wiring or Connector Issues <\/h3>\n<p>Corrosion, broken strands, or loose pins in the harness that runs from the PCM to Sensor B interrupt the signal. Heat cycles and vibration accelerate connector wear, especially in the engine bay where exposure to coolant and oil is common.<\/p>\n<h3>PCM Internal Fault <\/h3>\n<p>The communication controller inside the PCM can develop open or short circuits, or its microcontroller may experience memory corruption. When the internal UART (or CAN) interface fails, the PCM cannot poll the sensor, triggering U0671.<\/p>\n<h3>Sensor\u2011Circuit Interference <\/h3>\n<p>Electromagnetic interference from nearby high\u2011current devices (e.g., fuel\u2011pump driver, ignition coils) can mask the sensor\u2019s voltage signal. A compromised ground path also creates a noisy circuit that the PCM interprets as a loss of communication.<\/p>\n<h3>Outdated or Corrupt PCM Software <\/h3>\n<p>Factory software revisions sometimes contain bugs that misinterpret legitimate sensor data under specific temperature ranges. If the PCM\u2019s calibration tables are out of sync with the sensor\u2019s output range, the module may flag a loss of communication even though the wiring is intact.<\/p>\n<h2>Diagnostic and Repair Procedures<\/h2>\n<ol>\n<li><strong>Retrieve the code with a PCM\u2011compatible scanner<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Use a Level 2 or dealer\u2011grade scan tool. Confirm U0671 and note any pending or stored codes that could indicate related faults (e.g., B1220 \u2013 sensor circuit high). <\/p>\n<p> &#8211; Cost of a professional scan: <strong>$100\u2011$150<\/strong>.<\/p>\n<ol>\n<li><strong>Perform a live data check<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Access the \u201cFuel Temp Sensor B\u201d data stream. A flat line or erratic values confirms loss of communication. <\/p>\n<p> &#8211; Verify that Sensor A (if present) shows normal readings; this helps isolate the problem to the B circuit.<\/p>\n<ol>\n<li><strong>Inspect wiring and connectors<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Visually examine the harness for frayed wires, cracked insulation, or corroded pins. <\/p>\n<p> &#8211; Use a multimeter to check continuity (should read near 0 \u03a9) and resistance to ground (typically &lt; 1 \u03a9). <\/p>\n<p> &#8211; Repair any damaged sections with heat\u2011shrink tubing and proper crimp connectors. Typical repair labor: <strong>$80\u2011$120<\/strong>.<\/p>\n<ol>\n<li><strong>Test sensor power and ground<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Measure the sensor\u2019s supply voltage (usually 5 V) while the ignition is on. Low voltage may indicate a power\u2011supply fault rather than a PCM issue. <\/p>\n<p> &#8211; While a faulty sensor could cause the symptom, the issue may stem from the PCM not communicating correctly. A diagnostic scan and module communication test will determine if module replacement or reprogramming is needed.<\/p>\n<ol>\n<li><strong>Execute a PCM communication test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Many scan tools offer a \u201cPCM Self\u2011Test\u201d that cycles the communication lines. Failure of this test points to an internal PCM fault. <\/p>\n<ol>\n<li><strong>Re\u2011program or update PCM software<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the hardware checks out, load the latest PCM calibration file from the manufacturer. Re\u2011flashing typically costs <strong>$150\u2011$250<\/strong> plus labor. <\/p>\n<ol>\n<li><strong>Replace the PCM when communication cannot be restored<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When continuity, power, and software updates fail to re\u2011establish a signal, the PCM itself is the likely culprit. Replacement units vary depending on production date and software version, so the correct module is matched by VIN before programming. <\/p>\n<p><strong>Typical cost breakdown<\/strong> <\/p>\n<ul>\n<li>Wiring repair: <strong>$120\u2011$250<\/strong> (parts + labor). <\/li>\n<li>PCM re\u2011programming: <strong>$150\u2011$250<\/strong>. <\/li>\n<li>PCM replacement (including VIN\u2011matched unit and programming): <strong>$800\u2011$1,200<\/strong> for the part plus <strong>$200\u2011$300<\/strong> 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>If the PCM communication test fails after thorough wiring inspection and software updates, the probability of an internal PCM fault exceeds 70 %. Continuing to chase wiring repairs often results in repeated failures and higher shop time. Replacing the PCM eliminates the internal hardware defect and restores reliable sensor communication.<\/p>\n<p>Modern control modules are complex and integrated with security and immobilizer systems. That&#8217;s why choosing a replacement isn&#8217;t only about the hardware\u2014it&#8217;s about correct programming and compatibility. <strong>Flagship One<\/strong> specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by warranty. Their units arrive pre\u2011programmed to your vehicle\u2019s specifications, ensuring immediate compatibility and reducing installation time for qualified technicians.<\/p>\n<h2>Preventive Maintenance<\/h2>\n<ul>\n<li><strong>Regular visual inspections<\/strong> of the sensor harness during routine service (e.g., oil change) catch early signs of wear. <\/li>\n<li><strong>Clean connector terminals<\/strong> with dielectric grease to prevent corrosion, especially in humid climates. <\/li>\n<li><strong>Maintain proper coolant and oil levels<\/strong>; leaks can seep onto wiring bundles and accelerate degradation. <\/li>\n<li><strong>Schedule PCM software updates<\/strong> at manufacturer\u2011recommended intervals (often coinciding with major service campaigns). <\/li>\n<li><strong>Use OEM\u2011specified wiring repair kits<\/strong> if any damage is found; aftermarket kits lacking proper shielding can re\u2011introduce communication noise.<\/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 light, missing fuel\u2011temp reading on your vehicle? Lost communication with Fuel Temp Sensor B can disrupt performance\u2014scan and reprogram or replace.<\/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-519603","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>U0671 Code Symptoms, Causes, Diagnosis and Repair Guide Steps - 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-u0671-lost-communication-fuel-temperature-sensor-b\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0671 Code Symptoms, Causes, Diagnosis and Repair Guide Steps - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Engine light, missing fuel\u2011temp reading on your vehicle? 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