{"product_id":"ga111564-genuine-cummins®-def-sensor-head-assembly","title":"GA111564 | Genuine Cummins® DEF Sensor Head Assembly","description":"\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e: DEF Sensor Head Assembly\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e: New\u003cbr\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e: Cummins\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: GA111564\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFitment Guide GA111564:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eFor Tier 4 6.7L ISB\/QSB\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003eA DEF Sensor Head Assembly\u003cstrong\u003e GA111564\u003c\/strong\u003e, sometimes just called a DEF head, is a multi-function module that sits inside the Diesel Exhaust Fluid (DEF) tank and monitors key parameters of the DEF.\u003cbr\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"height: 1134px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 1134px;\"\u003e\n\u003ctd style=\"height: 1134px;\"\u003e\n\u003cstrong style=\"font-size: 0.875rem;\" data-end=\"334\" data-start=\"309\"\u003e1. Measures DEF Level\u003c\/strong\u003e\n\u003cp data-end=\"415\" data-start=\"335\"\u003e\u003cbr\u003eThe sensor tells the engine computer how much DEF is in the tank.\u003cbr data-end=\"403\" data-start=\"400\"\u003eThis allows:\u003c\/p\u003e\n\u003cul data-end=\"533\" data-start=\"416\"\u003e\n\u003cli data-end=\"436\" data-start=\"416\"\u003e\n\u003cp data-end=\"436\" data-start=\"418\"\u003eLow DEF warnings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"464\" data-start=\"437\"\u003e\n\u003cp data-end=\"464\" data-start=\"439\"\u003eAccurate gauge readings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"533\" data-start=\"465\"\u003e\n\u003cp data-end=\"533\" data-start=\"467\"\u003ePreventing the engine from going into \u003cstrong data-end=\"533\" data-start=\"505\"\u003elow-power or derate mode\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"575\" data-start=\"540\"\u003e\u003cstrong data-end=\"575\" data-start=\"544\"\u003e2. Monitors DEF Temperature\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"632\" data-start=\"576\"\u003eThe DEF head tracks fluid temperature so the system can:\u003c\/p\u003e\n\u003cul data-end=\"765\" data-start=\"633\"\u003e\n\u003cli data-end=\"684\" data-start=\"633\"\u003e\n\u003cp data-end=\"684\" data-start=\"635\"\u003eActivate the DEF tank heater when DEF is frozen\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"708\" data-start=\"685\"\u003e\n\u003cp data-end=\"708\" data-start=\"687\"\u003ePrevent overheating\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"765\" data-start=\"709\"\u003e\n\u003cp data-end=\"765\" data-start=\"711\"\u003eEnsure DEF is at the correct temperature for injection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"823\" data-start=\"772\"\u003e\u003cstrong data-end=\"823\" data-start=\"776\"\u003e3. Detects DEF Quality (Urea Concentration)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"955\" data-start=\"824\"\u003eMany modern DEF heads include a quality sensor that confirms the DEF has the correct \u003cstrong data-end=\"937\" data-start=\"909\"\u003e32.5% urea concentration\u003c\/strong\u003e.\u003cbr data-end=\"941\" data-start=\"938\"\u003eThis prevents:\u003c\/p\u003e\n\u003cul data-end=\"1048\" data-start=\"956\"\u003e\n\u003cli data-end=\"974\" data-start=\"956\"\u003e\n\u003cp data-end=\"974\" data-start=\"958\"\u003eEngine derates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1001\" data-start=\"975\"\u003e\n\u003cp data-end=\"1001\" data-start=\"977\"\u003eEmission system errors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1048\" data-start=\"1002\"\u003e\n\u003cp data-end=\"1048\" data-start=\"1004\"\u003eDamage caused by contaminated or diluted DEF\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1103\" data-start=\"1055\"\u003e\u003cstrong data-end=\"1103\" data-start=\"1059\"\u003e4. Provides a Suction Point for DEF Pump\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1127\" data-start=\"1104\"\u003eSome DEF heads include:\u003c\/p\u003e\n\u003cul data-end=\"1234\" data-start=\"1128\"\u003e\n\u003cli data-end=\"1145\" data-start=\"1128\"\u003e\n\u003cp data-end=\"1145\" data-start=\"1130\"\u003eA pickup tube\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1234\" data-start=\"1146\"\u003e\n\u003cp data-end=\"1234\" data-start=\"1148\"\u003eA filter\u003cbr data-end=\"1159\" data-start=\"1156\"\u003eThese allow the dosing pump to pull DEF from the tank cleanly and reliably.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1295\" data-start=\"1241\"\u003e\u003cstrong data-end=\"1295\" data-start=\"1245\"\u003e5. Communicates With the ECM \/ Emission System\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1341\" data-start=\"1296\"\u003eThe DEF head sends data to the ECM so it can:\u003c\/p\u003e\n\u003cul data-end=\"1448\" data-start=\"1342\"\u003e\n\u003cli data-end=\"1377\" data-start=\"1342\"\u003e\n\u003cp data-end=\"1377\" data-start=\"1344\"\u003eCorrectly control DEF injection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1411\" data-start=\"1378\"\u003e\n\u003cp data-end=\"1411\" data-start=\"1380\"\u003eMaintain proper NOx reduction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1448\" data-start=\"1412\"\u003e\n\u003cp data-end=\"1448\" data-start=\"1414\"\u003eStay compliant with emissions laws\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1496\" data-start=\"1455\"\u003e\u003cstrong data-end=\"1496\" data-start=\"1459\"\u003e6. Enables Cold-Weather Operation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1587\" data-start=\"1497\"\u003eDEF freezes at 12°F (-11°C), so most DEF heads include heaters or temperature controls to:\u003c\/p\u003e\n\u003cul data-end=\"1691\" data-start=\"1588\"\u003e\n\u003cli data-end=\"1607\" data-start=\"1588\"\u003e\n\u003cp data-end=\"1607\" data-start=\"1590\"\u003eThaw frozen DEF\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1650\" data-start=\"1608\"\u003e\n\u003cp data-end=\"1650\" data-start=\"1610\"\u003eAllow the system to function in winter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1691\" data-start=\"1651\"\u003e\n\u003cp data-end=\"1691\" data-start=\"1653\"\u003eProtect the pump and lines from damage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eSigns of Faulty GA111564\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong data-start=\"189\" data-end=\"249\" style=\"font-size: 0.875rem;\"\u003e1. DEF Quality Sensor Fault \/ “Poor DEF Quality” Warning\u003c\/strong\u003e\n\u003cul data-start=\"250\" data-end=\"446\"\u003e\n\u003cli data-start=\"250\" data-end=\"334\"\u003e\n\u003cp data-start=\"252\" data-end=\"334\"\u003eDash displays \u003cstrong data-start=\"266\" data-end=\"288\"\u003e“Poor DEF Quality”\u003c\/strong\u003e, \u003cstrong data-start=\"290\" data-end=\"312\"\u003e“Check DEF System”\u003c\/strong\u003e, or \u003cstrong data-start=\"317\" data-end=\"332\"\u003e“SCR Fault”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"335\" data-end=\"446\"\u003e\n\u003cp data-start=\"337\" data-end=\"446\"\u003eEven when you are using fresh, high-quality DEF\u003cbr data-start=\"384\" data-end=\"387\"\u003eThis happens when the quality sensor inside the head fails.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"453\" data-end=\"491\"\u003e\u003cstrong data-start=\"457\" data-end=\"491\"\u003e2. Incorrect DEF Level Reading\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"492\" data-end=\"645\"\u003e\n\u003cli data-start=\"492\" data-end=\"547\"\u003e\n\u003cp data-start=\"494\" data-end=\"547\"\u003eDEF gauge stuck on \u003cstrong data-start=\"513\" data-end=\"522\"\u003eempty\u003c\/strong\u003e, \u003cstrong data-start=\"524\" data-end=\"532\"\u003efull\u003c\/strong\u003e, or bouncing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"548\" data-end=\"645\"\u003e\n\u003cp data-start=\"550\" data-end=\"645\"\u003eSudden drop to empty even with DEF in the tank\u003cbr data-start=\"596\" data-end=\"599\"\u003eThis means the level sensor is malfunctioning.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"652\" data-end=\"692\"\u003e\u003cstrong data-start=\"656\" data-end=\"692\"\u003e3. Engine Derate \/ Loss of Power\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"693\" data-end=\"720\"\u003eA bad DEF head can trigger:\u003c\/p\u003e\n\u003cul data-start=\"721\" data-end=\"854\"\u003e\n\u003cli data-start=\"721\" data-end=\"751\"\u003e\n\u003cp data-start=\"723\" data-end=\"751\"\u003e\u003cstrong data-start=\"723\" data-end=\"749\"\u003e25% – 40% power derate\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"752\" data-end=\"854\"\u003e\n\u003cp data-start=\"754\" data-end=\"854\"\u003eSpeed limit (5 mph limp mode on some models)\u003cbr data-start=\"798\" data-end=\"801\"\u003eThe engine does this to protect emissions compliance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"861\" data-end=\"900\"\u003e\u003cstrong data-start=\"865\" data-end=\"900\"\u003e4. DEF Temperature Sensor Fault\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"901\" data-end=\"1037\"\u003e\n\u003cli data-start=\"901\" data-end=\"941\"\u003e\n\u003cp data-start=\"903\" data-end=\"941\"\u003eCode for DEF temperature high or low\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"942\" data-end=\"1037\"\u003e\n\u003cp data-start=\"944\" data-end=\"1037\"\u003eDEF heater not turning on or staying on too long\u003cbr data-start=\"992\" data-end=\"995\"\u003eBad temperature data causes ECM confusion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1044\" data-end=\"1086\"\u003e\u003cstrong data-start=\"1048\" data-end=\"1086\"\u003e5. SCR \/ NOx System Warning Lights\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1087\" data-end=\"1108\"\u003eCommon dash messages:\u003c\/p\u003e\n\u003cul data-start=\"1109\" data-end=\"1203\"\u003e\n\u003cli data-start=\"1109\" data-end=\"1143\"\u003e\n\u003cp data-start=\"1111\" data-end=\"1143\"\u003e\u003cstrong data-start=\"1111\" data-end=\"1141\"\u003e“Service Emissions System”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1144\" data-end=\"1163\"\u003e\n\u003cp data-start=\"1146\" data-end=\"1163\"\u003e\u003cstrong data-start=\"1146\" data-end=\"1161\"\u003e“SCR Fault”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1164\" data-end=\"1203\"\u003e\n\u003cp data-start=\"1166\" data-end=\"1203\"\u003e\u003cstrong data-start=\"1166\" data-end=\"1201\"\u003e“Aftertreatment System Problem”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1205\" data-end=\"1255\"\u003eThe DEF head feeds critical data to these systems.\u003c\/p\u003e\n\u003cp data-start=\"1262\" data-end=\"1311\"\u003e\u003cstrong data-start=\"1266\" data-end=\"1311\"\u003e6. No DEF Suction or DEF Pump Not Working\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1312\" data-end=\"1369\"\u003eIf the pickup tube, filter, or internal electronics fail:\u003c\/p\u003e\n\u003cul data-start=\"1370\" data-end=\"1445\"\u003e\n\u003cli data-start=\"1370\" data-end=\"1394\"\u003e\n\u003cp data-start=\"1372\" data-end=\"1394\"\u003eDEF pump may run dry\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1395\" data-end=\"1417\"\u003e\n\u003cp data-start=\"1397\" data-end=\"1417\"\u003eSystem won’t prime\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1418\" data-end=\"1445\"\u003e\n\u003cp data-start=\"1420\" data-end=\"1445\"\u003eNo DEF injection occurs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1452\" data-end=\"1490\"\u003e\u003cstrong data-start=\"1456\" data-end=\"1490\"\u003e7. Trouble Codes Stored in ECM\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1491\" data-end=\"1520\"\u003eYou may see codes related to:\u003c\/p\u003e\n\u003cul data-start=\"1521\" data-end=\"1627\"\u003e\n\u003cli data-start=\"1521\" data-end=\"1536\"\u003e\n\u003cp data-start=\"1523\" data-end=\"1536\"\u003eDEF quality\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1537\" data-end=\"1556\"\u003e\n\u003cp data-start=\"1539\" data-end=\"1556\"\u003eDEF temperature\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1557\" data-end=\"1570\"\u003e\n\u003cp data-start=\"1559\" data-end=\"1570\"\u003eDEF level\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1571\" data-end=\"1598\"\u003e\n\u003cp data-start=\"1573\" data-end=\"1598\"\u003eDEF tank heater circuit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1599\" data-end=\"1627\"\u003e\n\u003cp data-start=\"1601\" data-end=\"1627\"\u003eDEF pressure or delivery\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1629\" data-end=\"1675\"\u003eThese commonly point directly to the DEF head.\u003c\/p\u003e\n\u003cp data-start=\"1682\" data-end=\"1738\"\u003e\u003cstrong data-start=\"1686\" data-end=\"1738\"\u003e8. Crystallization Around DEF Tank or Connectors\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1739\" data-end=\"1876\"\u003e\n\u003cli data-start=\"1739\" data-end=\"1785\"\u003e\n\u003cp data-start=\"1741\" data-end=\"1785\"\u003eWhite crystals forming around the DEF head\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1786\" data-end=\"1876\"\u003e\n\u003cp data-start=\"1788\" data-end=\"1876\"\u003eIndicates leaks or internal cracking\u003cbr data-start=\"1824\" data-end=\"1827\"\u003eCrystallized DEF often damages wiring or sensors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1883\" data-end=\"1930\"\u003e\u003cstrong data-start=\"1887\" data-end=\"1930\"\u003e9. DEF Freezes or Doesn’t Thaw Properly\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1931\" data-end=\"1967\"\u003eIf the heater inside the head fails:\u003c\/p\u003e\n\u003cul data-start=\"1968\" data-end=\"2044\"\u003e\n\u003cli data-start=\"1968\" data-end=\"1990\"\u003e\n\u003cp data-start=\"1970\" data-end=\"1990\"\u003eDEF remains frozen\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1991\" data-end=\"2011\"\u003e\n\u003cp data-start=\"1993\" data-end=\"2011\"\u003eNo dosing occurs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2012\" data-end=\"2044\"\u003e\n\u003cp data-start=\"2014\" data-end=\"2044\"\u003eCold-weather SCR faults appear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003eCummins® is a worldwide leader in the production of engines, agricultural components, and other power-generating devices for various industries, including medium and heavy duty trucks, light commercial vehicles, buses, agriculture, and construction. Founded in 1919, this company stays true to its mission of making people's lives better by continuously improving its product line-up and introducing new solutions for a more prosperous world. Its core values—integrity, diversity and inclusion, excellence, caring, and teamwork—are what make it a successful company today—a worldwide leader with a network of more than 600 company-owned and independent distributors and almost 6,000 dealers in approximately 190 countries.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days\u003c\/strong\u003e warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website. \u003c\/p\u003e\n\u003cdiv style=\"position: absolute; left: 201px; top: 389px;\" id=\"gtx-trans\"\u003e\n\u003cdiv class=\"gtx-trans-icon\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Cummins®","offers":[{"title":"Default Title","offer_id":48107524554996,"sku":"GA111564","price":985.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/4353388-genuine-cummins-def-header-quality-level-sensor-advanced-truck-parts-40362.webp?v=1763576119","url":"https:\/\/firsttruckparts.com\/products\/ga111564-genuine-cummins%c2%ae-def-sensor-head-assembly","provider":"First Truck Parts","version":"1.0","type":"link"}