{"id":518385,"date":"2025-12-10T18:39:49","date_gmt":"2025-12-10T23:39:49","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-p2402-evap-system-leak-detection-pump-control-circuit-high\/"},"modified":"2025-12-10T18:39:49","modified_gmt":"2025-12-10T23:39:49","slug":"dtc-p2402-evap-system-leak-detection-pump-control-circuit-high","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-p2402-evap-system-leak-detection-pump-control-circuit-high\/","title":{"rendered":"P2402 Code Symptoms, Causes, Diagnosis &#038; Repair Overview Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">P2402<\/div>\n<h1>P2402 Code Symptoms, Causes, Diagnosis &amp; Repair Overview Guide<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>P2402 indicates a high\u2011voltage condition in the EVAP leak\u2011detection pump control circuit. <\/li>\n<li>Typical driver\u2011visible signs are a Check Engine light, EVAP readiness failure, and possible emissions\u2011test denial. <\/li>\n<li>Primary culprits are a faulty PCM output driver, damaged pump wiring, or a shorted pump driver module. <\/li>\n<li>Diagnosis starts with a scan, visual wiring inspection, and voltage testing of the pump circuit. <\/li>\n<li>Replacement of the PCM or pump driver is justified when repair attempts cannot restore correct voltage levels; Flagship One provides VIN\u2011matched, pre\u2011programmed replacement modules.<\/li>\n<\/ul>\n<\/div>\n<h3>Introduction <\/h3>\n<p>When the EVAP system\u2019s leak\u2011detection pump receives excessive voltage, the powertrain control module (PCM) logs a P2402 fault and illuminates the Check Engine light. Drivers usually notice the warning lamp at the next start\u2011up, and a subsequent emissions readiness test will show \u201cEVAP not ready.\u201d Because the fault resides in the pump\u2019s control circuit rather than in engine performance, the vehicle will still drive, but the high\u2011voltage condition prevents the pump from completing its self\u2011test, jeopardizing compliance with emissions regulations. Early identification of the underlying cause\u2014whether wiring, the pump driver, or the PCM itself\u2014can avoid repeated test failures and costly re\u2011programming later.<\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li><strong>Check Engine Light<\/strong> solid or flashing, often accompanied by the \u201cEVAP System\u201d code description on the OBD\u2011II scanner. <\/li>\n<li><strong>EVAP readiness monitor<\/strong> stuck \u201cnot ready\u201d after multiple drive cycles, leading to emissions\u2011test failure. <\/li>\n<li><strong>Inability to clear the code<\/strong> with a simple battery reset; the fault reappears after a short drive. <\/li>\n<li><strong>No change in engine performance<\/strong> (idle, acceleration, fuel economy) because the issue is isolated to the emissions control circuit. <\/li>\n<\/ul>\n<p>These signs point directly to a control\u2011circuit fault rather than to a mechanical problem in the fuel or ignition systems.<\/p>\n<h2>Why EVAP Leak Detection Pump Problems Occur <\/h2>\n<h3>High\u2011Voltage on the Pump Driver Circuit <\/h3>\n<p>The PCM supplies a regulated voltage (typically 12 V) to the pump driver. A shorted driver transistor or a failed internal regulator can push the voltage above the spec, triggering the \u201chigh\u201d condition that generates P2402.<\/p>\n<h3>Faulty PCM Output Driver <\/h3>\n<p>The PCM\u2019s output stage that commands the pump driver can develop an open\u2011circuit or shorted condition. When the PCM cannot properly modulate the pump\u2019s power, the control circuit registers an over\u2011voltage.<\/p>\n<h3>Damaged or Corroded Wiring Harness <\/h3>\n<p>The pump\u2019s power and ground wires run through the fuel\u2011tank area, where exposure to fuel vapors and moisture is common. Chafed insulation, broken conductors, or corrosion at connectors can create a resistance path that spikes voltage under load.<\/p>\n<h3>Water Intrusion or Condensation <\/h3>\n<p>Condensation inside the pump housing or connector boots can bridge circuits, temporarily raising voltage. This is often intermittent and may only appear after the vehicle sits overnight.<\/p>\n<h3>PCM Software\/Calibration Error <\/h3>\n<p>Rarely, an outdated PCM calibration can misinterpret normal voltage as a fault. Re\u2011flashing the PCM with the latest software resolves the false high\u2011voltage reading.<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Scan for Codes<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Connect a professional OBD\u2011II scanner. Record P2402 and any accompanying EVAP codes (e.g., P0455, P0456). Verify that the Check Engine light is active and note the EVAP readiness status.<\/p>\n<ol>\n<li><strong>Visual Wiring Inspection<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Locate the EVAP leak\u2011detection pump (often near the fuel tank). Examine the power, ground, and signal wires for fraying, abrasion, or corrosion. Clean connectors with electrical contact cleaner and re\u2011torque to manufacturer specs.<\/p>\n<ol>\n<li><strong>Voltage Test of Pump Circuit<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; With the ignition on, measure voltage at the pump driver input. The reading should be within the PCM\u2011specified range (typically 11.5\u201312.5 V). A reading above 13 V indicates a high\u2011voltage condition.<\/p>\n<ol>\n<li><strong>Resistance Check of Pump Coil<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Disconnect the pump and measure coil resistance. Compare to the service manual (often 0.8\u20131.2 \u03a9). An out\u2011of\u2011range value suggests a shorted pump that can pull the circuit voltage high.<\/p>\n<ol>\n<li><strong>PCM Output Test<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Using a test light or multimeter, probe the PCM\u2019s output pin that drives the pump. Verify that the signal switches correctly between 0 V (off) and the regulated voltage (on). Inconsistent or constantly high voltage points to a PCM fault.<\/p>\n<ol>\n<li><strong>Repair or Replace Wiring<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Replace any damaged harness sections, repair corroded connectors, and apply heat\u2011shrink tubing for moisture protection. Re\u2011test voltage after repairs.<\/p>\n<ol>\n<li><strong>Pump Driver or Pump Replacement<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the pump coil is shorted or the driver module fails its voltage test, replace the pump assembly. Typical pump\u2011module parts run $150\u2011$250; labor is $80\u2011$120.<\/p>\n<ol>\n<li><strong>PCM Re\u2011programming<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the PCM output driver is at fault but the hardware appears sound, reflash the PCM with the latest calibration. Most shops charge $120\u2011$180 for re\u2011programming plus labor.<\/p>\n<ol>\n<li><strong>PCM Replacement (if necessary)<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When the PCM output driver is internally damaged and cannot be repaired, replace the PCM. OEM\u2011grade PCM units cost $600\u2011$900; labor is $200\u2011$300. Ensure the replacement is VIN\u2011matched and programmed to the vehicle\u2019s specifications.<\/p>\n<p>All steps should be documented, and the fault code cleared after each repair attempt to confirm resolution.<\/p>\n<h2>When PCM 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 attempts to restore correct voltage through wiring repair, pump replacement, or software updates may fail if the PCM\u2019s internal driver circuitry is permanently damaged. In such cases, continued operation risks intermittent EVAP failures and repeated emissions\u2011test rejections. <\/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. Flagship One specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by warranty. Their modules are pre\u2011programmed to the exact software version required for your vehicle, eliminating the need for on\u2011site coding and reducing the risk of calibration errors.<\/p>\n<p>When a PCM replacement is warranted, sourcing a VIN\u2011matched unit from Flagship One ensures that the new module communicates flawlessly with the EVAP pump driver, the transmission controller, and all other vehicle networks.<\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Protect Wiring:<\/strong> Route the EVAP pump harness away from sharp edges and heat sources. Use protective sleeves in the fuel\u2011tank area to guard against abrasion. <\/li>\n<li><strong>Seal Connectors:<\/strong> Apply dielectric grease to pump connectors during service to repel moisture and prevent corrosion. <\/li>\n<li><strong>Monitor Fuel Quality:<\/strong> Use gasoline that meets the manufacturer\u2019s octane rating and avoid over\u2011filling the tank, which can force fuel vapors into the pump housing. <\/li>\n<li><strong>Periodic Scans:<\/strong> Run an OBD\u2011II readiness check every 6 000 mi to catch early voltage anomalies before they trigger a full\u2011scale P2402. <\/li>\n<li><strong>Avoid Water Exposure:<\/strong> Keep the vehicle\u2019s undercarriage clean after rain or washing; excess water can seep into the pump compartment and cause short circuits.<\/li>\n<\/ul>\n<p>Following these practices helps maintain the integrity of the pump control circuit and reduces the likelihood of high\u2011voltage faults.<\/p>\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>Check engine light and EVAP leak warning on your vehicle? A pump control circuit high can cause emissions issue\u2014scan, test 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-518385","post","type-post","status-publish","format-standard","hentry","category-auto-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P2402 Code Symptoms, Causes, Diagnosis &amp; Repair Overview Guide - 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-p2402-evap-system-leak-detection-pump-control-circuit-high\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P2402 Code Symptoms, Causes, Diagnosis &amp; Repair Overview Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Check engine light and EVAP leak warning on your vehicle? 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