May be bad coolant valve ore may be really faulty def tank sensor built in sender unit pablo ua dec 21 2016.
Cummins def tank heater control valve.
It begins to freeze around 12 f give or take.
Def quality sensor new for 2016 epa regulations def tank sensor assembly for level and temperature now fitted with quality sensor quality sensor must detect 32 5 concentration of def use def meeting iso22241 specifications for purity and composition store def in a cool dry well ventilated area out of direct sunlight.
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.
For this code the easiest thing to do unplug the def supply line heater connector.
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.
With the scan tool hooked up see if code p20b9 def supply line heater circuit high input is now active after 15 seconds.
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.
Typically there are 2 wires at the def supply line heater.
If this happens then the wiring def control unit module and pcm are good.
The reductant tank heater heats the def to prevent the fluid from freezing.
Good used def control module freightliner cascadia part 281020225.
I work on much larger vehicles and they have engine coolant run through the tank.
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 full tank assembly includes a header unit and sensors to measure urea levels temperature and quality.
Def quality and maintenance for selective catalytic reduction scr.
These are peterbilt parts and not cummins.
Sorry for the typo.
That is for the tank heater or heater control valve.
Please see pictures.
There s a temp sensor and a solenoid on the coolant line to control flow so the def doesn t overheat.
Or the red controller is making the heater continuously run that controller is a cummins part.
If the engine control module pcm detects the reductant tank heater is not operating properly it will set code p20b2.
There are line options offered in nylon and ethylene propylene diene monomer epdm materials for both purging and non purging dosing systems.
View all 31 cummins 121 detroit 5 n a 6 other.
Used def tank off a 2012 freightliner cascadia 125.
You need to seek a pete shop first as a cummins shop will charge you more to repair pete issues and may not have those types of parts in stock def controller not red controller.
