{"id":517498,"date":"2025-12-10T04:48:33","date_gmt":"2025-12-10T09:48:33","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-p0347-camshaft-position-sensor-circuit-low-bank-2\/"},"modified":"2025-12-10T04:48:33","modified_gmt":"2025-12-10T09:48:33","slug":"dtc-p0347-camshaft-position-sensor-circuit-low-bank-2","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-p0347-camshaft-position-sensor-circuit-low-bank-2\/","title":{"rendered":"P0347 Code Symptoms, Causes, Diagnosis, Repair Costs &#038; Safety Tips"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">P0347<\/div>\n<h1>P0347 Code Symptoms, Causes, Diagnosis, Repair Costs &amp; Safety Tips<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>P0347 = Camshaft Position Sensor A Circuit Low \u2013 Bank 2. <\/li>\n<li>Typical signs: check\u2011engine light, rough idle, misfire on cylinder 2\u2011bank, hesitation or loss of power. <\/li>\n<li>Most common causes: sensor wiring faults, connector corrosion, sensor internal failure, or ECM input\u2011circuit problems. <\/li>\n<li>Diagnosis starts with a live\u2011data scan, voltage checks, and wiring continuity tests; module re\u2011programming may be required. <\/li>\n<li>When the ECM\/PCM input circuit is damaged or repeatedly fails, a VIN\u2011matched replacement module from Flagship One is often the most reliable solution. <\/li>\n<\/ul>\n<\/div>\n<h3>P0347 Trouble Code \u2013 Symptoms, Causes, and How to Fix It <\/h3>\n<p>Drivers first notice a steady or flashing \u201ccheck\u2011engine\u201d lamp on the dash. In many cases the illumination is accompanied by a rough\u2011idle condition that feels like the engine is shaking at a stop. When the throttle is opened, a hesitation or stumble may occur, especially under load or during acceleration. Some owners report a brief loss of power that can feel like a stumble before the engine steadies again. In more severe instances the engine may stall while idling or during a light\u2011load acceleration. Because the camshaft position sensor on Bank 2 tells the ECM exactly when each cylinder fires, any loss of signal can cause the engine control strategy to revert to a default, less\u2011efficient mode, producing the symptoms described above. <\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Check\u2011engine light<\/strong> (solid or flashing) <\/li>\n<li><strong>Rough or uneven idle<\/strong> \u2013 engine shakes, RPMs fluctuate <\/li>\n<li><strong>Hesitation or stumble on acceleration<\/strong> \u2013 especially when demanding power from the second cylinder bank <\/li>\n<li><strong>Reduced power or \u201climp\u2011mode\u201d operation<\/strong> \u2013 engine may feel sluggish, and fuel economy can drop <\/li>\n<li><strong>Intermittent stalling<\/strong> while the vehicle is stationary or under light load <\/li>\n<\/ul>\n<p>These signs appear because the ECM receives a low\u2011voltage or open\u2011circuit reading from the Camshaft Position Sensor A on Bank 2, forcing it to rely on fallback timing maps. <\/p>\n<h2>Why This Happens <\/h2>\n<h3><strong>Camshaft Position Sensor A Failure (Bank 2)<\/strong> <\/h3>\n<p>The sensor generates a reference voltage that the ECM uses to determine camshaft rotation. Internal coil degradation, cracked housing, or moisture intrusion can cause the sensor output to drop below the ECM\u2019s minimum threshold, triggering the \u201ccircuit low\u201d condition. <\/p>\n<h3><strong>Wiring Harness Damage or Connector Corrosion<\/strong> <\/h3>\n<p>The sensor\u2019s signal travels through a dedicated wire bundle to the ECM. Pinched harnesses, chafed insulation, or corrosion on the sensor connector can introduce resistance that pulls the voltage down. Even a small increase in resistance (e.g., &gt; 5 \u03a9) can reduce the sensed voltage enough to set P0347. <\/p>\n<h3><strong>ECM\/PCM Input\u2011Circuit Fault<\/strong> <\/h3>\n<p>Inside the ECM, the front\u2011end amplifier that reads the sensor voltage can develop an open or high\u2011impedance fault. A failing input stage will interpret a normal sensor voltage as low, causing the same code. <\/p>\n<h3><strong>Software or Calibration Issues<\/strong> <\/h3>\n<p>Occasionally, a mismatch between the sensor\u2019s signal range and the ECM\u2019s calibration table can cause the ECM to misinterpret a valid voltage as low. This is most common after a major power\u2011train software update that does not include a fresh calibration for the camshaft sensor. <\/p>\n<p>While a faulty camshaft sensor or damaged wire could be the root cause, the issue may also stem from the ECM not processing the signal correctly. A comprehensive diagnostic that checks both the sensor circuit and the module\u2019s input circuitry is essential before deciding on a replacement. <\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Retrieve and Verify the Code<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a professional OBD\u2011II scanner. Confirm P0347 and note any additional codes (e.g., P0016, P0017) that indicate related timing issues. <\/p>\n<ol>\n<li><strong>Inspect Sensor and Connector<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Visually examine the Camshaft Position Sensor A on Bank 2 for oil, coolant, or carbon buildup. <\/p>\n<p> &#8211; Remove the connector, spray contact cleaner, and reseat it. Look for bent pins or corrosion. <\/p>\n<ol>\n<li><strong>Live\u2011Data Voltage Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; With the engine at idle, measure the sensor\u2019s voltage reference (usually 5 V) and signal voltage (typically 0.5\u20134.5 V). <\/p>\n<p> &#8211; Compare readings to manufacturer specifications. A reference voltage below 4.5 V or a signal voltage that never exceeds 0.5 V indicates a low\u2011circuit condition. <\/p>\n<ol>\n<li><strong>Wiring Continuity Check<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Disconnect the sensor and perform a resistance test from the sensor terminal to the ECM connector. <\/p>\n<p> &#8211; Resistance &gt; 5 \u03a9 or an open circuit confirms wiring damage. <\/p>\n<ol>\n<li><strong>ECM Input\u2011Circuit Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If sensor voltage and wiring are within spec, the fault likely resides in the ECM\u2019s front\u2011end amplifier. This test requires a bench\u2011level diagnostic tool or a qualified shop with access to the manufacturer\u2019s service information. <\/p>\n<ol>\n<li><strong>Software Re\u2011programming<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When the hardware checks out, update the ECM\u2019s calibration file to the latest version. Re\u2011flash the module using a dealer\u2011level or OEM\u2011approved programmer. <\/p>\n<ol>\n<li><strong>Component Repair vs. Replacement<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; <strong>Sensor repair<\/strong>: Not recommended as a primary solution because the sensor is a sealed electronic device. <\/p>\n<p> &#8211; <strong>Wiring repair<\/strong>: Replace or splice the damaged harness segment, ensuring proper shielding and torque. <\/p>\n<p> &#8211; <strong>ECM repair<\/strong>: Internal board repairs are possible but often temporary; repeated failures are common. <\/p>\n<ol>\n<li><strong>Module Replacement (if needed)<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When the ECM input circuit is confirmed defective, replace the control module with a VIN\u2011matched unit. <\/p>\n<p> &#8211; Cost for a new ECM\/PCM typically ranges from <strong>$800\u2011$1,200<\/strong> for the hardware, plus <strong>$200\u2011$300<\/strong> for programming. <\/p>\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 failures of the ECM\u2019s camshaft\u2011position input circuit, or a confirmed internal short, usually indicate that repair will only be a stop\u2011gap. A replacement module eliminates the risk of recurring electrical faults and restores the vehicle\u2019s calibrated timing strategy. <\/p>\n<p>Modern control modules are complex and integrated with security, immobilizer, and emission\u2011control systems. That\u2019s why choosing a replacement isn\u2019t only about the hardware\u2014it\u2019s about correct programming and compatibility. <strong>Flagship One<\/strong> specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by a warranty. Their units are pre\u2011programmed to the exact specifications of your vehicle, eliminating dealer\u2011only re\u2011flash steps and ensuring seamless integration with all onboard networks. <\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Routine Visual Checks<\/strong> \u2013 Inspect the camshaft sensor wiring and connectors during regular service intervals. Look for signs of wear, oil leaks, or coolant spray that can degrade insulation. <\/li>\n<li><strong>Keep Connectors Clean<\/strong> \u2013 Use dielectric grease on sensor plugs to repel moisture and prevent corrosion. <\/li>\n<li><strong>Avoid Engine Overheating<\/strong> \u2013 Excessive heat can accelerate sensor and wiring degradation; maintain proper cooling\u2011system service. <\/li>\n<li><strong>Periodic Scan\u2011Tool Reads<\/strong> \u2013 Even when the check\u2011engine light is off, run a live\u2011data scan every 6 000 mi to verify sensor voltages remain within spec. <\/li>\n<li><strong>Software Updates<\/strong> \u2013 Apply manufacturer\u2011issued ECM calibrations promptly; they often include refined camshaft\u2011position parameters that reduce false\u2011low readings.<\/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>Camshaft Position Sensor A Circuit Low Bank 2 lights check\u2011engine, risking power loss or stall in your vehicle. Scan, test, reprogram or replace today.<\/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-517498","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>P0347 Code Symptoms, Causes, Diagnosis, Repair Costs &amp; Safety Tips - 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-p0347-camshaft-position-sensor-circuit-low-bank-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0347 Code Symptoms, Causes, Diagnosis, Repair Costs &amp; Safety Tips - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Camshaft Position Sensor A Circuit Low Bank 2 lights check\u2011engine, risking power loss or stall in your vehicle. 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