There is no cooling for the DEF, so when the tank runs low after long running durations the tank temperature can increase. Also, the DEF constantly flows through the dosing module on the exhaust to keep this unit cool. This heat is returned to the DEF tank. Ensure that the Coolant Control Valve (CCV) is not flowing engine coolant through the DEF storage tank. Check the CCV for leaking, check the line connection and check if the coolant lines are warm to the level unit. Check the tank heating valve. Ensure the heating valve is in normal operation, not stuck open. If the heating valve is stuck open, replace the heater valve. If the valve is in normal operation, erase fault code and continue operation. The DEF tank heater control valve may stick intermittently. If the fault returns repeatedly, replace heater valve. On tractors built in Fargo, the DEF heater line with the 'red' band must be connected to the top tube which runs to the front part of the engine head. This may or may not be true for tractors built in other plants. If the DEF tank hoses are installed wrong, hot water can circulate continuously and overheat the DEF tank. If the hoses were connected wrong, the valve can be damaged and may also have to be changed to correct the overheating.
Check ballasts under back fender. There are 2 bolts holding the brake light cover. Remove to gain access to the ballasts. Check voltage on ballasts. Swap ballast wires from known working light to the non-working light. If the light works, replace ballast. If the light does not work, you may have a bad bulb or light assembly.
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Hard copies of operators manuals, installation instructions, and service/repair manuals are available to purchase through your local Plains Ag location or can be ordered through the CNHi Document Management Center by logging in to My CNHi Store, clicking on the appropriate CNHi brand (Case IH, Case Construction, New Holland Ag or New Holland CE) and then clicking on "Equipment Manuals" at the bottom of the page.
My CNHI StoreSpecialized tools may be required or recommended for certain repairs. These tools are referenced in the Service & Repair manuals by part number and can be purchased through the parts department at your local Plains Ag location. Or you can click the link below to use our convenient online parts request form to request a quote for the tools you need.
Parts Request FormPlains Ag offers our customers the full array of customer Electronic Service Tools (ESTs) and supporting adapters and software subscriptions for all four of the CNHi product lines that we represent: Case IH, Case Construction, New Holland Ag and New Holland Construction. The customer EST provides the following equipment information and diagnostic functionality.
Controller status/version retrieval | Parameter monitoring | Fault code retrieval and clearing | Fault code descriptions and repair processes | Electronic version of service manuals | Electrical and hydraulic schematics | Disassembly and reassembly instruction
Our expert Service Department team members will work with you to find the best parts solution for your machine. Fill in the form below and one of our expert team members will be in contact with you shortly! For immediate assistance, please call your local Plains Ag dealership and ask to speak with the Service Department.
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