{"id":519119,"date":"2025-12-11T06:22:02","date_gmt":"2025-12-11T11:22:02","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0137-lost-communication-trailer-brake-control-module\/"},"modified":"2025-12-11T06:22:02","modified_gmt":"2025-12-11T11:22:02","slug":"dtc-u0137-lost-communication-trailer-brake-control-module","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0137-lost-communication-trailer-brake-control-module\/","title":{"rendered":"U0137 Code Symptoms, Causes, Diagnosis &#038; Repair Guide and Steps"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">U0137<\/div>\n<h1>U0137 Code Symptoms, Causes, Diagnosis &amp; Repair Guide and Steps<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>**U0137 definition:** Lost communication with the Trailer Brake Control Module (TBCM). <\/li>\n<li>**Typical warning:** Trailer\u2011brake\u2011light indicator or ABS\u2011related warning stays illuminated. <\/li>\n<li>**Common causes:** Corroded CAN\u2011bus wiring, faulty TBCM power supply, module internal failure, or software corruption. <\/li>\n<li>**First\u2011step fix:** Scan the vehicle, verify CAN\u2011bus integrity, and re\u2011program or replace the TBCM as needed. <\/li>\n<li>**Flagship One advantage:** VIN\u2011matched, pre\u2011programmed replacement modules with lifetime warranty and plug\u2011and\u2011drive installation. <\/li>\n<\/ul>\n<\/div>\n<h3>U0137 Code: Symptoms, Causes, and How to Fix It <\/h3>\n<p>Drivers who tow a trailer often notice a warning light on the instrument panel that is dedicated to trailer\u2011brake monitoring. The light may flash or stay solid, and the trailer\u2019s brake\u2011light circuit may remain active even when the vehicle\u2019s brakes are not applied. In some cases the trailer\u2019s electronic brake\u2011control system (e.g., trailer ABS) will not engage, resulting in reduced stopping power for the trailer. These are the hallmark signs of the U0137 code: lost communication with the Trailer Brake Control Module.<\/p>\n<p>The problem is confined to the trailer\u2011brake network; engine performance, fuel delivery, and interior body functions remain unaffected. Because the vehicle\u2019s CAN bus cannot exchange data with the TBCM, any function that depends on that data\u2014brake\u2011light activation, trailer\u2011ABS modulation, and electronic brake\u2011controller commands\u2014fails or behaves erratically.<\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Trailer\u2011brake\u2011light warning illumination<\/strong> on the dash, often accompanied by a \u201cTrailer Brake\u201d message. <\/li>\n<li><strong>Continuous trailer brake\u2011light activation<\/strong> even when the service brakes are released. <\/li>\n<li><strong>Reduced or absent trailer braking<\/strong> when the vehicle\u2019s brakes are applied, especially noticeable on steep descents. <\/li>\n<li><strong>Trailer ABS or electronic brake\u2011controller indicator<\/strong> may appear, indicating loss of data from the TBCM. <\/li>\n<li><strong>No change in engine, transmission, or interior functions<\/strong>, confirming the issue is isolated to the trailer\u2011brake system.<\/li>\n<\/ul>\n<h2>Why This Happens <\/h2>\n<h3>Corroded or Damaged CAN\u2011Bus Wiring <\/h3>\n<p>The CAN bus carries high\u2011speed data between the vehicle\u2019s control modules and the TBCM. Exposure to road salt, moisture, or physical abrasion can corrode the twisted\u2011pair wires or their connectors. Corrosion introduces resistance and intermittent opens, breaking the communication link and triggering U0137.<\/p>\n<h3>Faulty Power Supply to the TBCM <\/h3>\n<p>The TBCM requires a stable 12 V supply, typically derived from the vehicle\u2019s lighting circuit. A blown fuse, a loose ground strap, or a failing voltage regulator can cause the module to lose power intermittently, resulting in a loss of communication.<\/p>\n<h3>Internal Module Failure <\/h3>\n<p>Control modules contain printed\u2011circuit boards, microprocessors, and memory chips. Over\u2011temperature events, moisture ingress, or manufacturing defects can damage these components. When the processor can no longer respond to CAN\u2011bus requests, the vehicle logs U0137.<\/p>\n<h3>Software Corruption <\/h3>\n<p>Modern TBCMs store calibration data and communication protocols in flash memory. A failed flash write, an incomplete over\u2011the\u2011air update, or a voltage spike during programming can corrupt the software, preventing the module from acknowledging bus messages.<\/p>\n<h3>Improper Trailer\u2011Brake Controller Integration <\/h3>\n<p>After installing an aftermarket trailer\u2011brake controller, mismatched wiring or incompatible communication protocols can prevent the vehicle\u2019s TBCM from recognizing the controller, leading to a U0137 condition. While the controller itself may be functional, the loss of communication is still a module\u2011level issue.<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Retrieve the Code and Freeze\u2011Frame Data<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a professional OBD\u2011II scanner capable of reading manufacturer\u2011specific codes. Record the exact timestamp, vehicle speed, and brake\u2011pedal position at the moment the code was set.<\/p>\n<ol>\n<li><strong>Visual Inspection of Wiring and Connectors<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Locate the TBCM (often near the rear bumper or under the trailer\u2011hitch assembly). Examine the CAN\u2011high and CAN\u2011low wires, power feed, and ground strap for corrosion, frayed insulation, or loose terminals. Clean any oxidation with a dielectric cleaner and re\u2011torque connectors to the manufacturer\u2019s spec (typically 12\u201315 lb\u2011ft).<\/p>\n<ol>\n<li><strong>CAN\u2011Bus Continuity Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Using a multimeter, verify continuity between the vehicle\u2019s CAN\u2011high and CAN\u2011low pins on the TBCM connector and the corresponding pins on the main control module (often the BCM or PCM). Resistance should be less than 60 \u03a9; higher values indicate a break or severe corrosion.<\/p>\n<ol>\n<li><strong>Power and Ground Verification<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Measure voltage at the TBCM power pin while the ignition is ON. A stable 12 V \u00b1 0.5 V indicates a healthy supply. Check ground resistance to chassis; it should be under 0.1 \u03a9.<\/p>\n<ol>\n<li><strong>Communication Test with a Scan Tool<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Many advanced scan tools can issue a \u201cCAN\u2011bus ping\u201d to the TBCM. A successful response confirms that the module is alive and correctly addressed. No response after confirming power and wiring points to internal module failure or software corruption.<\/p>\n<ol>\n<li><strong>Re\u2011programming Attempt<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the module responds but the code persists, download the latest TBCM firmware from the vehicle manufacturer and flash it using the scan tool. Re\u2011run the communication test. Successful re\u2011programming often clears U0137 without hardware replacement.<\/p>\n<ol>\n<li><strong>Module Repair vs. Replacement Decision<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the TBCM shows no response after power\/ground verification, internal damage is likely. Minor board\u2011level repairs (e.g., solder joint reflow) may be possible but are typically temporary. Replacement is usually more reliable, especially for vehicles older than five years.<\/p>\n<p><strong>Cost Overview<\/strong> <\/p>\n<ul>\n<li><strong>Diagnostic scan and wiring inspection:<\/strong> $80\u2011$120 labor. <\/li>\n<li><strong>Module repair (board\u2011level):<\/strong> $200\u2011$400 parts and labor, but success is not guaranteed. <\/li>\n<li><strong>Replacement TBCM (including programming):<\/strong> $600\u2011$900 for the unit plus $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>If the TBCM fails to communicate after confirming power, ground, and wiring integrity, the probability of a lasting fix from a board\u2011level repair drops below 30 %. Repeated repair attempts increase labor costs and risk re\u2011introducing faults. For most vehicles, especially those used for regular towing, a fresh, correctly programmed module restores full trailer\u2011brake functionality with minimal downtime.<\/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 specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by a lifetime warranty.<\/strong> Replacement units vary depending on production date and software version, so the correct module is matched by VIN before programming. This eliminates the guesswork of generic aftermarket parts and ensures seamless integration with the vehicle\u2019s CAN network.<\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Protect Connectors:<\/strong> Apply dielectric grease to all TBCM connectors during routine trailer\u2011hitch inspections. This repels moisture and reduces corrosion risk. <\/li>\n<li><strong>Routine Wiring Checks:<\/strong> Every 12 000 mi, inspect the CAN\u2011bus harness for signs of wear, especially after winter road\u2011salt exposure. Replace any compromised sections promptly. <\/li>\n<li><strong>Power\u2011Supply Monitoring:<\/strong> Verify that the trailer\u2011brake\u2011light fuse remains intact and that the grounding strap stays tight. A loose ground can cause intermittent loss of communication. <\/li>\n<li><strong>Software Updates:<\/strong> When the vehicle manufacturer releases a TBCM firmware update, have it applied during the next scheduled service. Updated software often includes improved error handling for the CAN bus. <\/li>\n<li><strong>Proper Trailer\u2011Brake Controller Installation:<\/strong> Follow the vehicle\u2019s service manual for wiring diagrams and torque specifications. Avoid aftermarket adapters that bypass the OEM TBCM unless they are explicitly approved.<\/li>\n<\/ul>\n<div class=\"cta-section\">\n<h2>VIN-Programmed Control Module Replacement<\/h2>\n<p>Flagship One provides VIN-programmed, OEM engine and powertrain control modules backed by lifetime warranty. Units arrive pre-programmed to your vehicle&#8217;s specifications for plug-and-drive installation.<\/p>\n<p><a class=\"cta-button\" href=\"https:\/\/www.fs1inc.com\/\">View Products<\/a>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Trailer brake light stays on your car? Lost communication with Trailer Brake Control Module can cut power\u2014scan the CAN bus and have the module repaired.<\/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-519119","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>U0137 Code Symptoms, Causes, Diagnosis &amp; Repair Guide and 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-u0137-lost-communication-trailer-brake-control-module\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0137 Code Symptoms, Causes, Diagnosis &amp; Repair Guide and Steps - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Trailer brake light stays on your car? 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