Cummins Def Tank Heater Control Valve

For this code the easiest thing to do unplug the def supply line heater connector.

Cummins def tank heater control valve.

The full tank assembly includes a header unit and sensors to measure urea levels temperature and quality. I work on much larger vehicles and they have engine coolant run through the tank. If the engine control module pcm detects the reductant tank heater is not operating properly it will set code p20b2. It begins to freeze around 12 f give or take.

He thinks either the heater for the def or the temp sensor could be the problem cause i used enough def even more than usually so pump is working for sure. The tank heater consists of an electrically powered tank heater control valve which controls the flow of engine coolant to a heating coil inside the diesel exhaust fluid tank. These are peterbilt parts and not cummins. Powertrain control module pcm failure symptoms.

Used def tank off a 2012 freightliner cascadia 125. View all 31 cummins 121 detroit 5 n a 6 other. Good used def control module freightliner cascadia part 281020225. Or the red controller is making the heater continuously run that controller is a cummins part.

The tank heater control valve opens to allow coolant to flow to the heating coil when heating is commanded and closes when heating is no longer required the diesel. Sorry for the typo. View all 5 air 155 air hydraulic 3 hydraulic. If this happens then the wiring def control unit module and pcm are good.

Typically there are 2 wires at the def supply line heater. The def tank heater only runs when the truck is running the def tank heater may or may not go in 30 second cycles of on and off and may or may not cycle based on def temp or exterior temp neither are sure what temp sensor triggers the heater to kick in nor at what temp. The reductant tank heater heats the def to prevent the fluid from freezing. With the scan tool hooked up see if code p20b9 def supply line heater circuit high input is now active after 15 seconds.

There s a temp sensor and a solenoid on the coolant line to control flow so the def doesn t overheat. Def quality and maintenance for selective catalytic reduction scr. There are line options offered in nylon and ethylene propylene diene monomer epdm materials for both purging and non purging dosing systems. May be bad coolant valve ore may be really faulty def tank sensor built in sender unit pablo ua dec 21 2016.

That is for the tank heater or heater control valve. Please see pictures.