{"id":519493,"date":"2025-12-11T11:53:54","date_gmt":"2025-12-11T16:53:54","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0555-invalid-data-received-from-remote-start-module\/"},"modified":"2025-12-11T11:53:54","modified_gmt":"2025-12-11T16:53:54","slug":"dtc-u0555-invalid-data-received-from-remote-start-module","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0555-invalid-data-received-from-remote-start-module\/","title":{"rendered":"U0555 Code Symptoms, Causes, Diagnosis &#038; Repair Cost Overview"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">U0555<\/div>\n<h1>U0555 Code Symptoms, Causes, Diagnosis &amp; Repair Cost Overview<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>**U0555 definition:** Invalid Data Received From Remote\u2011Start Module. <\/li>\n<li>**Typical signs:** Remote\u2011start button does nothing, \u201cRemote\u2011Start\u201d warning light stays on, or the vehicle refuses to start when the remote\u2011start command is sent. <\/li>\n<li>**Root cause:** Communication failure between the Remote\u2011Start Module and the vehicle\u2019s control network (usually the Body\u2011Control Module). Corrupted data, wiring faults, or power\u2011supply anomalies are the most common triggers. <\/li>\n<li>**Resolution path:** Scan for the code, inspect wiring and connectors, re\u2011program the module, and if communication cannot be restored, replace the module with a VIN\u2011matched unit (Flagship One supplies fully programmed replacements). <\/li>\n<\/ul>\n<\/div>\n<h3>Introduction <\/h3>\n<p>Drivers who rely on a push\u2011button or key\u2011fob remote start quickly notice when the feature stops working. The instrument panel may flash a \u201cRemote\u2011Start\u201d warning, the engine will not crank after pressing the remote\u2011start button, or the vehicle will start normally only when the key is inserted manually. These behaviors are the hallmark of the U0555 diagnostic trouble code. Because the code specifically indicates that the vehicle\u2019s control network has received invalid data from the Remote\u2011Start Module, the problem is confined to the communication link and the module itself\u2014not to the engine, transmission, or brake system. Early identification and proper module\u2011focused troubleshooting can restore remote\u2011start functionality without unnecessary component replacement.<\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Remote\u2011start command ignored:<\/strong> Pressing the remote\u2011start button produces no response; the vehicle does not crank or ignite. <\/li>\n<li><strong>Persistent \u201cRemote\u2011Start\u201d warning light:<\/strong> A dedicated warning indicator remains illuminated on the dash even when the remote\u2011start button is not being used. <\/li>\n<li><strong>Intermittent no\u2011start when using remote start:<\/strong> The vehicle sometimes starts with the remote command and sometimes does not, indicating sporadic data corruption. <\/li>\n<li><strong>No fault codes other than U0555:<\/strong> The scan tool shows only the U0555 code, confirming the issue is isolated to the Remote\u2011Start Module communication.<\/li>\n<\/ul>\n<p>These signs are directly tied to the remote\u2011start system\u2019s inability to exchange valid information with the vehicle\u2019s network.<\/p>\n<h2>Why Remote\u2011Start Module Problems Occur <\/h2>\n<h3>Corrupted Firmware or Data in the Remote\u2011Start Module <\/h3>\n<p>The module stores calibration tables and security keys. If the flash memory becomes corrupted\u2014through a failed update, exposure to voltage spikes, or moisture ingress\u2014the data it transmits can be flagged as invalid by the receiving control unit, triggering U0555.<\/p>\n<h3>Faulty Communication Bus or Wiring <\/h3>\n<p>Most modern vehicles use a CAN (Controller Area Network) bus to link the Remote\u2011Start Module with the Body\u2011Control Module (BCM). A broken wire, corroded pin, or loose connector on the bus can introduce noise or loss of bits, causing the receiving module to reject the data as invalid.<\/p>\n<h3>Power\u2011Supply Irregularities <\/h3>\n<p>The Remote\u2011Start Module draws power from the vehicle\u2019s accessory circuit. Low battery voltage, intermittent grounding, or voltage spikes from the alternator can cause the module to reset or send malformed packets, resulting in the U0555 condition.<\/p>\n<h3>Interference from Aftermarket Accessories <\/h3>\n<p>Aftermarket alarm systems, keyless\u2011entry modules, or non\u2011OEM remote\u2011start kits sometimes share the same communication lines. Improper shielding or conflicting software can corrupt the data stream, prompting the control network to log U0555.<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Retrieve and Confirm the Code<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a professional scan tool capable of reading manufacturer\u2011specific codes. Verify that U0555 is present and that no other network\u2011related codes accompany it.<\/p>\n<ol>\n<li><strong>Visual Inspection of Connectors and Wiring<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Locate the Remote\u2011Start Module (often under the dash or in the engine compartment). Check all pins for corrosion, bent terminals, or broken wires. Repair or replace damaged harness sections before proceeding.<\/p>\n<ol>\n<li><strong>Bidirectional Communication Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Using the scan tool, initiate a \u201cread data\u201d command to the Remote\u2011Start Module and observe the response. A successful exchange confirms the module can both send and receive valid data. Failure indicates a communication barrier.<\/p>\n<ol>\n<li><strong>Power\u2011Supply Verification<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Measure voltage at the module\u2019s power feed while the ignition is OFF and ON. Values should be within 11.5 V\u201314.5 V. If voltage drops below 11 V during remote\u2011start attempts, address the battery or charging system before further testing.<\/p>\n<ol>\n<li><strong>Re\u2011program or Re\u2011flash the Module<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the module passes the wiring and power checks but still returns invalid data, re\u2011flash the latest factory firmware using the manufacturer\u2019s re\u2011programming equipment. This step restores corrupted tables and security keys.<\/p>\n<ol>\n<li><strong>Module Replacement<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Should the communication test continue to fail after re\u2011programming, the Remote\u2011Start Module is likely internally damaged. Replace it with a VIN\u2011matched unit that has been pre\u2011programmed to the vehicle\u2019s software version. After installation, clear the code and perform a functional test of the remote\u2011start feature.<\/p>\n<p><strong>Typical cost ranges<\/strong> <\/p>\n<ul>\n<li>Diagnostic scan and communication test: <strong>$80\u2011$120<\/strong> labor. <\/li>\n<li>Re\u2011programming with factory tools: <strong>$150\u2011$250<\/strong> (includes software license). <\/li>\n<li>Replacement Remote\u2011Start Module (VIN\u2011matched, pre\u2011programmed): <strong>$400\u2011$650<\/strong> plus <strong>$150\u2011$200<\/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>When the Remote\u2011Start Module fails the bidirectional communication test after thorough wiring, power, and firmware verification, replacement becomes the most reliable solution. Repeated re\u2011flashing attempts rarely succeed if internal circuitry\u2014such as the CAN transceiver or microcontroller\u2014has been compromised. <\/p>\n<p><strong>Flagship One specialization<\/strong> <\/p>\n<p>Modern control modules are complex and integrated with security, immobilizer, and vehicle\u2011network systems. Choosing a replacement isn\u2019t only about the hardware; it\u2019s about correct programming and seamless compatibility. Flagship One specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by a comprehensive warranty. Their units arrive pre\u2011programmed to the exact software version required for your vehicle, eliminating dealer\u2011only re\u2011coding steps and reducing installation time.<\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Keep connectors clean and tight:<\/strong> Periodically inspect the Remote\u2011Start Module\u2019s harness for corrosion or looseness, especially after exposure to road salt or moisture. <\/li>\n<li><strong>Protect wiring from abrasion:<\/strong> Route cables away from moving parts and heat sources; use protective sleeves where the harness passes near the exhaust or suspension. <\/li>\n<li><strong>Maintain battery health:<\/strong> A healthy battery ensures stable voltage for the module. Check electrolyte levels (if applicable) and keep terminals free of corrosion. <\/li>\n<li><strong>Use OEM remote\u2011start accessories:<\/strong> Aftermarket kits can introduce incompatible communication protocols. OEM\u2011approved accessories preserve data integrity across the network. <\/li>\n<li><strong>Schedule regular software updates:<\/strong> When manufacturers release network or security updates, have a qualified technician apply them to keep the Remote\u2011Start Module firmware current.<\/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>Remote start won\u2019t work on your vehicle? Invalid data from the Remote Start Module can prevent operation\u2014scan, check wiring, 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-519493","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>U0555 Code Symptoms, Causes, Diagnosis &amp; Repair Cost Overview - 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-u0555-invalid-data-received-from-remote-start-module\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0555 Code Symptoms, Causes, Diagnosis &amp; Repair Cost Overview - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Remote start won\u2019t work on your vehicle? 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