{"id":519100,"date":"2025-12-11T06:02:54","date_gmt":"2025-12-11T11:02:54","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0118-lost-communication-fuel-additive-control-module\/"},"modified":"2025-12-11T06:02:54","modified_gmt":"2025-12-11T11:02:54","slug":"dtc-u0118-lost-communication-fuel-additive-control-module","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0118-lost-communication-fuel-additive-control-module\/","title":{"rendered":"U0118 Code Symptoms, Causes, Diagnosis &#038; Repair Steps Manual"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">U0118<\/div>\n<h1>U0118 Code Symptoms, Causes, Diagnosis &amp; Repair Steps Manual<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>U0118 means the PCM cannot talk to the Fuel Additive Control Module (FACM). <\/li>\n<li>Drivers usually see the check\u2011engine light, a drop in fuel\u2011economy, or occasional rough\u2011idle\/hesitation. <\/li>\n<li>Causes are wiring\/connectors, voltage spikes, or a failed FACM that has lost internal communication. <\/li>\n<li>Diagnosis requires a bi\u2011directional scan, continuity testing, and, if needed, re\u2011flashing or replacement of the FACM. <\/li>\n<li>Replacement units are VIN\u2011matched, pre\u2011programmed and installed plug\u2011and\u2011drive; Flagship One supplies these modules with a warranty. <\/li>\n<\/ul>\n<\/div>\n<h3>Introduction <\/h3>\n<p>When the check\u2011engine light illuminates and you notice a subtle loss of fuel efficiency, the problem may lie in a communication breakdown between the powertrain control module and the Fuel Additive Control Module (FACM). The U0118 diagnostic trouble code (DTC) appears when the PCM reports that it has lost contact with the FACM, the component that meters additive dosing into the fuel stream. Because the FACM supplies data used for emissions calculations and fuel\u2011system timing, its silence can trigger the engine\u2011monitor light and cause the engine to run slightly leaner, resulting in reduced miles per gallon and occasional rough\u2011idle or hesitation. Early identification of the loss\u2011of\u2011communication condition prevents unnecessary wear on other control units and keeps the vehicle within emissions compliance.<\/p>\n<h3>Symptoms <\/h3>\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 the loss of FACM data. <\/li>\n<li><strong>Reduced fuel\u2011economy<\/strong> \u2013 owners typically report a 2\u20115 % drop in miles per gallon after the code appears. <\/li>\n<li><strong>Occasional rough idle or hesitation<\/strong> \u2013 the engine may stumble at idle or during light throttle because the PCM is operating without additive\u2011dose feedback. <\/li>\n<li><strong>Emissions\u2011related readiness loss<\/strong> \u2013 the vehicle may fail an OBD\u2011II emissions test until the code is cleared and the FACM communication is restored. <\/li>\n<\/ul>\n<h3>Why Fuel Additive Control Module Problems Occur <\/h3>\n<h4>Faulty Wiring or Connectors <\/h4>\n<p>The FACM communicates with the PCM via a dedicated CAN\u2011high\/low pair or a proprietary serial line. Corrosion, chafed harnesses, or loose pins break the signal path, causing the PCM to time\u2011out and set U0118. <\/p>\n<h4>Voltage Spikes or Ground Issues <\/h4>\n<p>Transient voltage spikes from the alternator or a weak battery ground can corrupt the FACM\u2019s internal processor. Repeated spikes may fry the module\u2019s communication transceiver, resulting in intermittent or permanent loss of contact. <\/p>\n<h4>Internal FACM Failure <\/h4>\n<p>The FACM contains a microcontroller, memory, and dosing pump driver circuitry. Water intrusion, solder\u2011joint fatigue, or component aging can cause the module to stop transmitting its status frames. In many cases the FACM will still power up, but the communication controller is dead. <\/p>\n<h4>Software Corruption <\/h4>\n<p>Incorrect re\u2011programming of the FACM or a failed OTA update can leave the module\u2019s firmware in an unrecoverable state. The PCM then receives no valid data and logs U0118. <\/p>\n<h3>Diagnostic and Repair Procedures <\/h3>\n<ol>\n<li><strong>Retrieve the DTC<\/strong> \u2013 Connect a bi\u2011directional scan tool and confirm U0118. Record any additional codes that may indicate related network faults (e.g., U0100, U0140).\n<\/li>\n<li><strong>Inspect wiring harness<\/strong> \u2013 Visually examine the FACM connector for corrosion, bent pins, or damaged insulation. Use a multimeter to verify continuity on each CAN or serial line and check for proper ground resistance (&lt; 5 \u03a9).\n<\/li>\n<li><strong>Perform a communication test<\/strong> \u2013 Many scan tools have a \u201cNetwork Scan\u201d function that shows real\u2011time traffic. Absence of FACM frames confirms loss of communication.\n<\/li>\n<li><strong>Check power supply<\/strong> \u2013 Measure voltage at the FACM power pin while the ignition is on; it should be within 11.5\u201114.5 V. Low voltage suggests a grounding or alternator issue, which should be addressed before proceeding.\n<\/li>\n<li><strong>Re\u2011flash the FACM<\/strong> \u2013 If the module\u2019s firmware is suspected, use the manufacturer\u2019s re\u2011programming procedure. This often requires a dealer\u2011level tool; a qualified independent shop can perform it with the proper software.\n<\/li>\n<li><strong>Module repair vs. replacement decision<\/strong> \u2013 If the communication test shows no signal after wiring and power checks, and re\u2011flashing does not restore traffic, the FACM is likely internally damaged.\n<\/li>\n<li><strong>Replace the FACM<\/strong> \u2013 Obtain a VIN\u2011matched replacement, have it programmed to the vehicle\u2019s software version, and install it plug\u2011and\u2011drive. Clear the code and verify that the check\u2011engine light stays off and fuel\u2011economy returns to normal.\n<\/li>\n<\/ol>\n<p><strong>Typical costs<\/strong> \u2013 Re\u2011flashing may run $150\u2011$250 in labor. A VIN\u2011matched FACM replacement, including programming, generally costs $600\u2011$900 plus $150\u2011$250 labor. <\/p>\n<h3>When Fuel Additive Control Module Replacement Makes More Sense Than Repair <\/h3>\n<p>Repair of a FACM is feasible only when the failure is limited to a single component such as a blown fuse or a damaged connector. Once the internal communication controller or microprocessor is compromised, repair becomes a temporary fix; the module may fail again after a short drive cycle. <\/p>\n<p>Modern control modules are deeply integrated with security, immobilizer, and emissions systems. That integration means a replacement must be correctly programmed to the vehicle\u2019s VIN and software revision before it can communicate on the network. Using an OEM\u2011spec replacement that is not VIN\u2011matched can trigger additional DTCs or cause the vehicle to remain in a limp mode. <\/p>\n<p><strong>Flagship One specializes in VIN\u2011matched control modules<\/strong>, providing a plug\u2011and\u2011drive solution backed by a warranty. Replacement units are pre\u2011programmed to the exact specifications of the vehicle, eliminating the need for on\u2011site coding and reducing installation time. The warranty covers both the hardware and the programming, giving owners confidence that the new FACM will remain functional for the life of the vehicle. <\/p>\n<p>When the cost of a professional repair approaches or exceeds the price of a new, VIN\u2011matched module, or when the vehicle is more than five years old and the original FACM is out of warranty, replacement is the more reliable and cost\u2011effective path. <\/p>\n<h3>Preventive Maintenance <\/h3>\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 corrosion. <\/li>\n<li><strong>Maintain a healthy charging system<\/strong> \u2013 Keep the battery voltage above 12.4 V at rest and ensure the alternator output stays within spec (13.8\u201114.8 V). Stable voltage reduces the risk of spikes that can damage the FACM. <\/li>\n<li><strong>Avoid fuel additives not approved by the manufacturer<\/strong> \u2013 Unapproved additives can introduce contaminants that accelerate internal FACM wear. <\/li>\n<li><strong>Run a full system scan at major service intervals<\/strong> \u2013 A scan that includes network health checks can catch early communication degradation before the U0118 code is set.<\/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 class=\"content-section\">\n<h2>Frequently Asked Questions<\/h2>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Fuel\u2011additive warning on your vehicle? Lost communication with the Fuel Additive Control Module can raise emissions, stall\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-519100","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>U0118 Code Symptoms, Causes, Diagnosis &amp; Repair Steps Manual - 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-u0118-lost-communication-fuel-additive-control-module\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0118 Code Symptoms, Causes, Diagnosis &amp; Repair Steps Manual - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Fuel\u2011additive warning on your vehicle? 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