{"product_id":"2290991-genuine-cummins®-doser-fluid-supply-module-for-epa21-15l-isx-qsx","title":"2290991 | Genuine Cummins® Doser Fluid Supply Module For EPA21 15L ISX\/QSX","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003cbr\u003eA DEF (Diesel Exhaust Fluid) doser or supply module \u003cstrong\u003e2290991\u003c\/strong\u003e is a key component in modern diesel engine emission systems — specifically in the Selective Catalytic Reduction (SCR) system. Its main job is to deliver precise amounts of DEF into the exhaust stream to help reduce harmful nitrogen oxide (NOₓ) emissions. Doser Fluid Supply Module For EPA21 15L ISX\/QSX For Kenworth T680, T880, Peterbilt 579\u003cstrong\u003e\u003cbr\u003e\u003cbr\u003ePart Number\u003c\/strong\u003e: 2290991, 2290991PE, 2290991PEX\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003cspan\u003e: New\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eManufacture\/Brand\u003c\/strong\u003e\u003cspan\u003e: Cummins\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cstrong data-end=\"176\" data-start=\"160\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cstrong\u003eFits\u003c\/strong\u003e \u003cstrong\u003e2290991 \u003c\/strong\u003eFor Kenworth T680, T880, Peterbilt 579\u003cbr\u003e\u003cstrong\u003eEngines\u003c\/strong\u003e\u003cspan\u003e: B6.7 CM2350 B121B, B6.7 CM2450 B155B, L9 CM2450 L126B, X12 CM2350 X119B, X12 CM2450 X137B, X15 CM2450 X124B, X15 CM2450 X134B\u003c\/span\u003e\u003cstrong data-end=\"597\" data-start=\"585\"\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cstrong data-end=\"597\" data-start=\"585\"\u003ePurpose of using 2290991:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp data-start=\"359\" data-end=\"411\"\u003e\u003cstrong data-start=\"359\" data-end=\"372\"\u003eDraws DEF\u003c\/strong\u003e (a urea-water solution) from the tank.\u003cbr\u003e\u003cstrong data-start=\"414\" data-end=\"439\"\u003ePumps and pressurizes\u003c\/strong\u003e it via the supply module.\u003cbr\u003eSends the DEF through \u003cstrong data-start=\"490\" data-end=\"506\"\u003eheated lines\u003c\/strong\u003e to the \u003cstrong data-start=\"514\" data-end=\"530\"\u003edosing valve\u003c\/strong\u003e (doser).\u003cbr\u003eThe \u003cstrong data-start=\"546\" data-end=\"562\"\u003edoser sprays\u003c\/strong\u003e DEF into the exhaust pipe, just before the SCR catalyst.\u003cbr\u003eInside the hot exhaust, DEF breaks down into \u003cstrong data-start=\"667\" data-end=\"684\"\u003eammonia (NH₃)\u003c\/strong\u003e.\u003cbr\u003eThe ammonia reacts with NOₓ in the SCR catalyst and \u003cstrong data-start=\"740\" data-end=\"779\"\u003econverts it into nitrogen and water\u003c\/strong\u003e — which are harmless.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-end=\"703\" data-start=\"585\"\u003e\u003cstrong data-end=\"597\" data-start=\"585\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSigns of a Bad Doser Fluid Supply Module 2290991:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong data-start=\"1672\" data-end=\"1706\" style=\"font-size: 0.875rem;\"\u003eDEF dosing too low or too high\u003c\/strong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e triggers check engine lights.\u003c\/span\u003e\n\u003cp data-start=\"1739\" data-end=\"1797\"\u003eEngine may enter \u003cstrong data-start=\"1756\" data-end=\"1771\"\u003ederate mode\u003c\/strong\u003e, limiting speed or power.\u003cbr\u003eCan cause failed emissions tests or poor fuel economy.\u003cbr\u003eCommon failure codes: \u003cstrong data-start=\"1879\" data-end=\"1891\"\u003eSPN 4334\u003c\/strong\u003e, \u003cstrong data-start=\"1893\" data-end=\"1905\"\u003eSPN 5246\u003c\/strong\u003e, \u003cstrong data-start=\"1907\" data-end=\"1919\"\u003eSPN 4375\u003c\/strong\u003e, etc.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-end=\"476\" data-start=\"97\"\u003e \u003c\/p\u003e\n\u003cp data-end=\"476\" data-start=\"97\"\u003e\u003cstrong data-end=\"151\" data-start=\"97\"\u003eAbout the Manufacturer – \u003c\/strong\u003e\u003cstrong data-end=\"151\" data-start=\"97\"\u003eCummins:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"381\" data-start=\"0\"\u003eCummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.\u003c\/p\u003e\n\u003cp data-end=\"628\" data-start=\"383\"\u003eThe brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.\u003c\/p\u003e","brand":"Cummins","offers":[{"title":"Default Title","offer_id":50529940111607,"sku":"2290991","price":899.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/7080\/3959\/files\/s-l1600-2025-10-02T212909.898.webp?v=1759429795","url":"https:\/\/forcetruckparts.com\/products\/2290991-genuine-cummins%c2%ae-doser-fluid-supply-module-for-epa21-15l-isx-qsx","provider":"Force Truck Parts","version":"1.0","type":"link"}