{"product_id":"000140543980-genuine-detroit-diesel®-diesel-exhaust-fluid-dosing-unit","title":"000140543980 | Genuine Detroit Diesel® Diesel Exhaust Fluid Dosing Unit","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003cbr\u003e\u003c\/strong\u003eA Diesel Exhaust Fluid (DEF) Dosing Unit \u003cstrong\u003e000140543980 \u003c\/strong\u003eis a component in modern diesel vehicles that injects Diesel Exhaust Fluid into the exhaust system to reduce harmful emissions.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: 000140543980\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003cspan\u003e: New\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eManufacture\/Brand\u003c\/strong\u003e\u003cspan\u003e: Detroit Diesel\u003cbr\u003e\u003cstrong\u003eRelated Part Numbers\u003c\/strong\u003e: A000140543980, DDE-A000140543980, DDEA000140543980, RA000140543980, EA000140543980\u003cbr\u003e\u003c\/span\u003e\u003cstrong data-end=\"176\" data-start=\"160\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cstrong\u003eFits 000140543980 \u003c\/strong\u003eFor\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003cstrong data-end=\"450\" data-start=\"417\" style=\"font-size: 0.875rem;\"\u003eDetroit Diesel \/ Freightliner\u003c\/strong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e heavy trucks with SCR emissions systems\u003c\/span\u003e\n\u003cp\u003e– Especially on GHG17 \/ EPA10 emission spec engines\u003cbr data-end=\"549\" data-start=\"546\"\u003e– Used on models like Freightliner Cascadia with Detroit engines\u003cbr data-end=\"618\" data-start=\"615\"\u003e(DEF metering unit in the aftertreatment) \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"919\" data-start=\"705\"\u003e\u003cstrong data-end=\"735\" data-start=\"705\"\u003eMercedes-Benz heavy trucks\u003c\/strong\u003e such as the \u003cstrong data-end=\"790\" data-start=\"748\"\u003eActros MP4 \/ similar commercial trucks\u003c\/strong\u003e\u003cbr data-end=\"793\" data-start=\"790\"\u003e\u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr\u003eTrucks and engines that require a DEF dosing system under \u003cstrong data-end=\"1010\" data-start=\"981\"\u003eEPA emissions regulations\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-end=\"919\" data-start=\"705\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003carticle data-turn=\"user\" data-scroll-anchor=\"false\" data-testid=\"conversation-turn-1\" data-turn-id=\"3f3b6bf9-203a-4bd7-8cf5-3c6d035daa00\" dir=\"auto\" class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-(--header-height)\" tabindex=\"-1\"\u003e\u003c\/article\u003e\n\u003cul class=\"nav catalog\" id=\"catalogModels\"\u003e\u003c\/ul\u003e\n\u003cp data-end=\"353\" data-start=\"160\"\u003e\u003cstrong\u003ePurpose of using 000140543980:\u003c\/strong\u003e\u003cstrong data-end=\"597\" data-start=\"585\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e 1.  Inject DEF into the Exhaust\u003c\/strong\u003e\n\u003cp data-start=\"521\" data-end=\"537\"\u003e\u003cbr\u003eThe dosing unit:\u003c\/p\u003e\n\u003cul data-start=\"538\" data-end=\"654\"\u003e\n\u003cli data-start=\"538\" data-end=\"593\"\u003e\n\u003cp data-start=\"540\" data-end=\"593\"\u003eReceives signals from the engine control module (ECM)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"594\" data-end=\"654\"\u003e\n\u003cp data-start=\"596\" data-end=\"654\"\u003eSprays a precise amount of DEF into the hot exhaust stream\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"656\" data-end=\"732\"\u003eAccuracy is critical — too much or too little affects emissions performance.\u003c\/p\u003e\n\u003cp data-start=\"739\" data-end=\"766\"\u003e\u003cstrong\u003e2. Reduce NOx Emissions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"767\" data-end=\"788\"\u003eWhen DEF is injected:\u003c\/p\u003e\n\u003cul data-start=\"789\" data-end=\"950\"\u003e\n\u003cli data-start=\"789\" data-end=\"827\"\u003e\n\u003cp data-start=\"791\" data-end=\"827\"\u003eIt turns into ammonia in the exhaust\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"828\" data-end=\"884\"\u003e\n\u003cp data-start=\"830\" data-end=\"884\"\u003eInside the SCR catalyst, ammonia reacts with NOx gases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"885\" data-end=\"950\"\u003e\n\u003cp data-start=\"887\" data-end=\"950\"\u003eHarmful NOx is converted into harmless nitrogen and water vapor\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"952\" data-end=\"1016\"\u003eThis allows the engine to meet strict environmental regulations.\u003c\/p\u003e\n\u003cp data-start=\"1023\" data-end=\"1052\"\u003e\u003cstrong\u003e3. Protect the SCR System\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1053\" data-end=\"1077\"\u003eThe dosing unit ensures:\u003c\/p\u003e\n\u003cul data-start=\"1078\" data-end=\"1154\"\u003e\n\u003cli data-start=\"1078\" data-end=\"1099\"\u003e\n\u003cp data-start=\"1080\" data-end=\"1099\"\u003eProper DEF quantity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1100\" data-end=\"1123\"\u003e\n\u003cp data-start=\"1102\" data-end=\"1123\"\u003eCorrect spray pattern\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1124\" data-end=\"1154\"\u003e\n\u003cp data-start=\"1126\" data-end=\"1154\"\u003eEven distribution in exhaust\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1156\" data-end=\"1170\"\u003eThis prevents:\u003c\/p\u003e\n\u003cul data-start=\"1171\" data-end=\"1245\"\u003e\n\u003cli data-start=\"1171\" data-end=\"1192\"\u003e\n\u003cp data-start=\"1173\" data-end=\"1192\"\u003eDEF crystallization\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1193\" data-end=\"1210\"\u003e\n\u003cp data-start=\"1195\" data-end=\"1210\"\u003eCatalyst damage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1211\" data-end=\"1245\"\u003e\n\u003cp data-start=\"1213\" data-end=\"1245\"\u003eInefficient emissions conversion\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1252\" data-end=\"1280\"\u003e\u003cstrong\u003e4. Prevent Engine Derate\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1281\" data-end=\"1306\"\u003eIf the dosing unit fails:\u003c\/p\u003e\n\u003cul data-start=\"1307\" data-end=\"1405\"\u003e\n\u003cli data-start=\"1307\" data-end=\"1349\"\u003e\n\u003cp data-start=\"1309\" data-end=\"1349\"\u003eThe truck may enter power reduction mode\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1350\" data-end=\"1375\"\u003e\n\u003cp data-start=\"1352\" data-end=\"1375\"\u003eEmissions faults appear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1376\" data-end=\"1405\"\u003e\n\u003cp data-start=\"1378\" data-end=\"1405\"\u003eThe vehicle may limit speed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1407\" data-end=\"1512\"\u003eThe dosing unit keeps the emissions system functioning correctly so the engine can operate at full power.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-end=\"353\" data-start=\"160\"\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 Diesel Exhaust Fluid Dosing Unit 000140543980:\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-end=\"371\" data-start=\"324\"\u003e\u003cstrong\u003e1. Check Engine Light \/ SCR Warning Light\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"462\" data-start=\"372\"\u003e\n\u003cli data-end=\"408\" data-start=\"372\"\u003e\n\u003cp data-end=\"408\" data-start=\"374\"\u003eEmissions system warning appears\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"439\" data-start=\"409\"\u003e\n\u003cp data-end=\"439\" data-start=\"411\"\u003e“SCR System Fault” message\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"462\" data-start=\"440\"\u003e\n\u003cp data-end=\"462\" data-start=\"442\"\u003eDEF system warning\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"495\" data-start=\"464\"\u003eThis is usually the first sign.\u003c\/p\u003e\n\u003cp data-end=\"530\" data-start=\"502\"\u003e\u003cstrong\u003e2. Engine Power Derate\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"644\" data-start=\"531\"\u003e\n\u003cli data-end=\"555\" data-start=\"531\"\u003e\n\u003cp data-end=\"555\" data-start=\"533\"\u003eReduced engine power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"616\" data-start=\"556\"\u003e\n\u003cp data-end=\"616\" data-start=\"558\"\u003eLimited speed (sometimes 5–55 mph depending on severity)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"644\" data-start=\"617\"\u003e\n\u003cp data-end=\"644\" data-start=\"619\"\u003e“Engine Derate” message\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"733\" data-start=\"646\"\u003eIf the system can’t control NOx emissions, the truck protects itself by limiting power.\u003c\/p\u003e\n\u003cp data-end=\"776\" data-start=\"740\"\u003e\u003cstrong\u003e3. DEF Crystallization Buildup\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"857\" data-start=\"777\"\u003e\n\u003cli data-end=\"823\" data-start=\"777\"\u003e\n\u003cp data-end=\"823\" data-start=\"779\"\u003eWhite, chalky deposits around the injector\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"857\" data-start=\"824\"\u003e\n\u003cp data-end=\"857\" data-start=\"826\"\u003eDEF residue on exhaust piping\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"877\" data-start=\"859\"\u003eThis may indicate:\u003c\/p\u003e\n\u003cul data-end=\"944\" data-start=\"878\"\u003e\n\u003cli data-end=\"898\" data-start=\"878\"\u003e\n\u003cp data-end=\"898\" data-start=\"880\"\u003eLeaking injector\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"921\" data-start=\"899\"\u003e\n\u003cp data-end=\"921\" data-start=\"901\"\u003ePoor spray pattern\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"944\" data-start=\"922\"\u003e\n\u003cp data-end=\"944\" data-start=\"924\"\u003eStuck dosing valve\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"985\" data-start=\"951\"\u003e\u003cstrong\u003e4. Excessive NOx Fault Codes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1022\" data-start=\"986\"\u003eDiagnostic trouble codes related to:\u003c\/p\u003e\n\u003cul data-end=\"1081\" data-start=\"1023\"\u003e\n\u003cli data-end=\"1041\" data-start=\"1023\"\u003e\n\u003cp data-end=\"1041\" data-start=\"1025\"\u003eNOx efficiency\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1061\" data-start=\"1042\"\u003e\n\u003cp data-end=\"1061\" data-start=\"1044\"\u003eSCR performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1081\" data-start=\"1062\"\u003e\n\u003cp data-end=\"1081\" data-start=\"1064\"\u003eDEF dosing rate\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1129\" data-start=\"1083\"\u003eThe system detects improper injection amounts.\u003c\/p\u003e\n\u003cp data-end=\"1169\" data-start=\"1136\"\u003e\u003cstrong\u003e5. White Smoke from Exhaust\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1229\" data-start=\"1170\"\u003e\n\u003cli data-end=\"1204\" data-start=\"1170\"\u003e\n\u003cp data-end=\"1204\" data-start=\"1172\"\u003eVisible white vapor under load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1229\" data-start=\"1205\"\u003e\n\u003cp data-end=\"1229\" data-start=\"1207\"\u003eStrong ammonia smell\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1250\" data-start=\"1231\"\u003eThis can happen if:\u003c\/p\u003e\n\u003cul data-end=\"1313\" data-start=\"1251\"\u003e\n\u003cli data-end=\"1279\" data-start=\"1251\"\u003e\n\u003cp data-end=\"1279\" data-start=\"1253\"\u003eToo much DEF is injected\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1313\" data-start=\"1280\"\u003e\n\u003cp data-end=\"1313\" data-start=\"1282\"\u003eDEF is not atomizing properly\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1346\" data-start=\"1320\"\u003e\u003cstrong\u003e6. Poor Fuel Economy\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1440\" data-start=\"1347\"\u003eImproper emissions control can cause the engine to compensate, slightly affecting efficiency.\u003c\/p\u003e\n\u003cp data-end=\"1478\" data-start=\"1447\"\u003e\u003cstrong\u003e7. DEF Consumption Issues\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1540\" data-start=\"1479\"\u003e\n\u003cli data-end=\"1510\" data-start=\"1479\"\u003e\n\u003cp data-end=\"1510\" data-start=\"1481\"\u003eDEF level dropping too fast\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1540\" data-start=\"1511\"\u003e\n\u003cp data-end=\"1540\" data-start=\"1513\"\u003eDEF not being used at all\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1583\" data-start=\"1542\"\u003eEither can indicate a dosing malfunction.\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\u003e\u003cstrong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAbout the Manufacturer – \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eDetroit Diesel:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"396\" data-start=\"0\"\u003e\u003cstrong data-end=\"18\" data-start=\"0\"\u003eDetroit Diesel\u003c\/strong\u003e is a leading American manufacturer of \u003cstrong data-is-only-node=\"\" data-end=\"129\" data-start=\"57\"\u003eheavy-duty diesel engines, transmissions, and aftertreatment systems\u003c\/strong\u003e, primarily for the commercial trucking industry. Founded in 1938 and now a subsidiary of \u003cstrong data-end=\"250\" data-start=\"219\"\u003eDaimler Truck North America\u003c\/strong\u003e, Detroit is best known for its \u003cstrong data-end=\"303\" data-start=\"282\"\u003eDD Series engines\u003c\/strong\u003e — including the \u003cstrong data-end=\"344\" data-start=\"320\"\u003eDD13, DD15, and DD16\u003c\/strong\u003e — which power Freightliner and Western Star trucks.\u003c\/p\u003e\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"791\" data-start=\"398\"\u003eDetroit also produces advanced technologies such as \u003cstrong data-end=\"468\" data-start=\"450\"\u003eDetroit™ Axles\u003c\/strong\u003e, \u003cstrong data-end=\"490\" data-start=\"470\"\u003eDetroit™ Connect\u003c\/strong\u003e telematics, and \u003cstrong data-end=\"533\" data-start=\"507\"\u003eintegrated powertrains\u003c\/strong\u003e, offering fleet operators improved fuel efficiency, uptime, and diagnostics. The company is headquartered in \u003cstrong data-end=\"664\" data-start=\"643\"\u003eDetroit, Michigan\u003c\/strong\u003e, and continues to play a central role in modernizing emissions systems and performance standards in heavy-duty transportation.\u003c\/p\u003e","brand":"Detroit Diesel","offers":[{"title":"Default Title","offer_id":50531956097271,"sku":"000140543980","price":465.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/7080\/3959\/files\/photo_2026-03-25_19-40-57.jpg?v=1774460555","url":"https:\/\/forcetruckparts.com\/products\/000140543980-genuine-detroit-diesel%c2%ae-diesel-exhaust-fluid-dosing-unit","provider":"Force Truck Parts","version":"1.0","type":"link"}